BIOSITE DIAGNOSTICS INC
S-1, 1996-12-11
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<PAGE>   1
 
   AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON DECEMBER 11, 1996
                                                     REGISTRATION NO. 333-
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
 
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                            ------------------------
 
                                    FORM S-1
                             REGISTRATION STATEMENT
                                     UNDER
                           THE SECURITIES ACT OF 1933
                            ------------------------
                        BIOSITE DIAGNOSTICS INCORPORATED
 
             (EXACT NAME OF REGISTRANT AS SPECIFIED IN ITS CHARTER)
 
<TABLE>
<S>                                   <C>                                   <C>
               DELAWARE                                3826                               33-0288606
     (STATE OR OTHER JURISDICTION          (PRIMARY STANDARD INDUSTRIAL                (I.R.S. EMPLOYER
  OF INCORPORATION OR ORGANIZATION)        CLASSIFICATION CODE NUMBER)               IDENTIFICATION NO.)
</TABLE>
 
                              11030 ROSELLE STREET
                          SAN DIEGO, CALIFORNIA 92121
                                 (619) 455-4808
              (ADDRESS, INCLUDING ZIP CODE, AND TELEPHONE NUMBER,
       INCLUDING AREA CODE, OF REGISTRANT'S PRINCIPAL EXECUTIVE OFFICES)
                            ------------------------
 
                              KIM D. BLICKENSTAFF
                     PRESIDENT AND CHIEF EXECUTIVE OFFICER
                        BIOSITE DIAGNOSTICS INCORPORATED
                              11030 ROSELLE STREET
                          SAN DIEGO, CALIFORNIA 92121
                                 (619) 455-4808
           (NAME, ADDRESS, INCLUDING ZIP CODE, AND TELEPHONE NUMBER,
             INCLUDING AREA CODE, OF AGENT FOR SERVICE OF PROCESS)
                            ------------------------
 
                                   COPIES TO:
 
<TABLE>
<S>                                           <C>
         THOMAS E. SPARKS, JR., ESQ.                     ALAN C. MENDELSON, ESQ.
            JOHN L. DONAHUE, ESQ.                         D. BRADLEY PECK, ESQ.
            GEORGE A. GUCKER, ESQ.                        NANCY E. DENYES, ESQ.
        PILLSBURY MADISON & SUTRO LLP                       COOLEY GODWARD LLP
                P.O. BOX 7880                        4365 EXECUTIVE DRIVE, SUITE 1100
         SAN FRANCISCO, CA 94120-7880                    SAN DIEGO, CA 92121-2128
</TABLE>
 
                            ------------------------
 
     APPROXIMATE DATE OF COMMENCEMENT OF PROPOSED SALE TO THE PUBLIC: As soon as
practicable after the Registration Statement becomes effective.
 
     If any of the securities being registered on this Form are to be offered on
a delayed or continuous basis pursuant to Rule 415 under the Securities Act of
1933, check the following box.  [ ]
 
     If this Form is filed to register additional securities for an offering
pursuant to Rule 462(b) under the Securities Act, please check the following box
and list the Securities Act registration statement number of the earlier
effective registration statement for the same offering.  [ ]
 
     [ ]  If this Form is a post-effective amendment filed pursuant to Rule
462(c) under the Securities Act, check the following box and list the Securities
Act registration statement number of the earlier effective registration
statement for the same offering.
 
     [ ]  If delivery of the prospectus is expected to be made pursuant to Rule
434, please check the following box.
                            ------------------------
                        CALCULATION OF REGISTRATION FEE
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                                                                   PROPOSED         PROPOSED
                                                   AMOUNT          MAXIMUM           MAXIMUM
           TITLE OF EACH CLASS OF                  TO BE        OFFERING PRICE      AGGREGATE         AMOUNT OF
         SECURITIES TO BE REGISTERED           REGISTERED(1)     PER SHARE(2)   OFFERING PRICE(2)  REGISTRATION FEE
<S>                                          <C>               <C>             <C>                <C>
- --------------------------------------------------------------------------------------------------------------------
Common Stock, $.01 par value.................     2,300,000         $13.00         $29,900,000          $9,061
- --------------------------------------------------------------------------------------------------------------------
- --------------------------------------------------------------------------------------------------------------------
</TABLE>
 
(1) Includes 300,000 shares that the Underwriters have the option to purchase to
    cover over-allotments, if any.
 
(2) Estimated solely for the purpose of computing the registration fee pursuant
    to Rule 457(a).
                            ------------------------
 
     THE REGISTRANT HEREBY AMENDS THIS REGISTRATION STATEMENT ON SUCH DATE OR
DATES AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL THE REGISTRANT SHALL
FILE A FURTHER AMENDMENT WHICH SPECIFICALLY STATES THAT THIS REGISTRATION
STATEMENT SHALL THEREAFTER BECOME EFFECTIVE IN ACCORDANCE WITH SECTION 8(a) OF
THE SECURITIES ACT OF 1933 OR UNTIL THE REGISTRATION STATEMENT SHALL BECOME
EFFECTIVE ON SUCH DATE AS THE COMMISSION, ACTING PURSUANT TO SAID SECTION 8(a),
MAY DETERMINE.
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
<PAGE>   2
 
     INFORMATION CONTAINED HEREIN IS SUBJECT TO COMPLETION OR AMENDMENT. A
     REGISTRATION STATEMENT RELATING TO THESE SECURITIES HAS BEEN FILED WITH THE
     SECURITIES AND EXCHANGE COMMISSION. THESE SECURITIES MAY NOT BE SOLD NOR
     MAY OFFERS TO BUY BE ACCEPTED PRIOR TO THE TIME THE REGISTRATION STATEMENT
     BECOMES EFFECTIVE. THIS PROSPECTUS SHALL NOT CONSTITUTE AN OFFER TO SELL OR
     THE SOLICITATION OF ANY OFFER TO BUY NOR SHALL THERE BE ANY SALE OF THESE
     SECURITIES IN ANY STATE IN WHICH SUCH OFFER, SOLICITATION OR SALE WOULD BE
     UNLAWFUL PRIOR TO REGISTRATION OR QUALIFICATION UNDER THE SECURITIES LAWS
     OF ANY SUCH STATE.
 
PROSPECTUS (Subject to Completion)
Dated December 11, 1996
                                2,000,000 SHARES
 
                                      LOGO
 
                                  COMMON STOCK
                            ------------------------
 
     All of the 2,000,000 shares of Common Stock, $.01 par value per share (the
"Common Stock"), offered hereby are being sold by Biosite Diagnostics
Incorporated ("Biosite" or the "Company"). Prior to this offering, there has
been no public market for the Common Stock of the Company. It is estimated that
the initial public offering price will be between $11.00 and $13.00 per share.
See "Underwriting" for a discussion of the factors to be considered in
determining the initial public offering price. Application has been made to have
the Common Stock approved for quotation on the Nasdaq National Market under the
symbol "BSTE."
                            ------------------------
 
                 THIS OFFERING INVOLVES A HIGH DEGREE OF RISK.
           SEE "RISK FACTORS" BEGINNING ON PAGE 6 OF THIS PROSPECTUS.
                            ------------------------
 
THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES AND
   EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE
      SECURITIES AND EXCHANGE COMMISSION OR ANY STATE SECURITIES
      COMMISSION PASSED UPON THE ACCURACY OR ADEQUACY OF THIS
        PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A CRIMINAL
           OFFENSE.
 
<TABLE>
<CAPTION>
- -------------------------------------------------------------------------------------------------
- -------------------------------------------------------------------------------------------------
                                                                                 
                                                           UNDERWRITING          
                                        PRICE TO           DISCOUNTS AND         PROCEEDS TO
                                         PUBLIC           COMMISSIONS(1)         COMPANY(2)
- -------------------------------------------------------------------------------------------------
<S>                                 <C>                 <C>                  <C>
Per Share.........................     $                   $                    $
Total (3).........................  $                   $                    $
- -------------------------------------------------------------------------------------------------
- -------------------------------------------------------------------------------------------------
</TABLE>
 
(1) The Company has agreed to indemnify the Underwriters against certain
    liabilities, including liabilities under the Securities Act of 1933, as
    amended. See "Underwriting."
(2) Before deducting expenses payable by the Company, estimated to be $700,000.
(3) The Company has granted the Underwriters an option, exercisable within 30
    days of the date hereof, to purchase an aggregate of up to 300,000
    additional shares at the Price to Public less Underwriting Discounts and
    Commissions to cover over-allotments, if any. If all such additional shares
    are purchased, the total Price to Public, Underwriting Discounts and
    Commissions and Proceeds to Company will be $          , $          and
    $          , respectively. See "Underwriting."
                            ------------------------
 
     The Common Stock is offered by the several Underwriters named herein when,
as and if received and accepted by them, subject to their right to reject orders
in whole or in part and subject to certain other conditions. It is expected that
delivery of certificates for the shares will be made at the offices of Cowen &
Company, New York, New York on or about                , 1997.
                            ------------------------
 
                      COWEN & COMPANY  ALEX. BROWN & SONS
                                                      INCORPORATED
 
            , 1997
<PAGE>   3
 
                                            TRIAGE(R) PANEL
                                            FOR DRUGS OF ABUSE
                                            EMERGENCY ROOM SCREENING
 
    TRIAGE(R)                               TRIAGE(R) PLUS TCA
    PANEL FOR                               EMERGENCY ROOM SCREENING
    DRUGS OF ABUSE                          TRIAGE(R) INTERVENTION
                                            WORKPLACE SCREENING
 
                                            MERCK TRIAGE(R)
                                            INTERNATIONAL MARKETS
 
   [PHOTOGRAPHS SHOWING TRIAGE DOA TEST DEVICE AND VARIOUS TRIAGE DOA PRODUCT
                                CONFIGURATIONS]
 
                                   [ARTWORK]
 
     IN CONNECTION WITH THIS OFFERING, THE UNDERWRITERS MAY OVER-ALLOT OR EFFECT
TRANSACTIONS WHICH STABILIZE OR MAINTAIN THE MARKET PRICE OF THE COMMON STOCK OF
THE COMPANY AT A LEVEL ABOVE THAT WHICH MIGHT OTHERWISE PREVAIL IN THE OPEN
MARKET. SUCH TRANSACTIONS MAY BE EFFECTED ON THE NASDAQ NATIONAL MARKET. SUCH
STABILIZING, IF COMMENCED, MAY BE DISCONTINUED AT ANY TIME.
 
     Biosite(R) and Triage(R) are registered trademarks of the Company.
Immediate Response Diagnostics(TM), Express Test(SM), Triage CareLink(TM) and
the Company's logo are servicemarks or trademarks of the Company. This
Prospectus also includes trade names and trademarks of companies other than
Biosite.
<PAGE>   4
 
                                                                BIOSITE'S TRIAGE
                                               PANELS AND TRIAGE CARELINK SYSTEM
                                                              PRODUCT ATTRIBUTES
 
TRIAGE(R)
PANEL FOR DRUGS OF ABUSE
IS USED IN A VARIETY OF
SETTINGS FOR RAPID DRUG SCREENING
 
                                                                   RAPID RESULTS
 
                                                                     EASE OF USE
 
                                                        HIGH ANALYTICAL ACCURACY
 
                                                      MULTIPLE ANALYTE DETECTION
 
                                                                     RELIABILITY
 
                                                              COST EFFECTIVENESS
 
     [PHOTOGRAPHS OF CERTAIN SETTINGS IN WHICH TRIAGE DOA IS USED (HOSPITAL
            LABORATORIES, EMERGENCY ROOMS AND WORKPLACE SCREENING)]
<PAGE>   5
 
         [PHOTOGRAPHS SHOWING THE COMPANY'S PRODUCTS UNDER DEVELOPMENT]
 
TRIAGE(R) PANELS
 
   TRIAGE(R) O & P              TRIAGE(R) C.DIFF          TRIAGE(R) ENTERIC
 (PARASITE SCREENING)         (PATHOGEN DETECTION)       (PATHOGEN SCREENING)
                              
                              
                             
                             
 
TRIAGE(R) CARELINK SYSTEM
 
  TRIAGE(R) CARDIAC                               TRIAGE(R) TRANSPLANT
  (ACUTE MYOCARDIAL                             (CYCLOSPORIN MONITORING)
INFARCTION DETECTION)
                            
                            
 
     THE COMPANY'S PRODUCTS IN DEVELOPMENT ARE IN VARIOUS STAGES OF RESEARCH OR
DEVELOPMENT AND HAVE NOT BEEN APPROVED BY THE UNITED STATES FOOD AND DRUG
ADMINISTRATION FOR COMMERCIAL SALE. THERE CAN BE NO ASSURANCE THAT THE COMPANY'S
PRODUCTS IN DEVELOPMENT WILL BE SUCCESSFULLY DEVELOPED OR APPROVED BY REGULATORY
AUTHORITIES FOR COMMERCIAL SALE.

<PAGE>   6
 
                               PROSPECTUS SUMMARY
 
     The following summary is qualified in its entirety by the more detailed
information and financial statements and notes appearing elsewhere in this
Prospectus. Except as set forth in the financial statements and notes thereto or
otherwise as specified herein, all information in this Prospectus (i) assumes no
exercise of the Underwriters' over-allotment option, (ii) reflects the
conversion of all outstanding shares of Preferred Stock of the Company into
shares of Common Stock upon the closing of this offering and (iii) includes
92,222 shares which will be issued upon conversion of a $1.0 million debenture
into shares of Common Stock upon the closing of this offering, assuming an
initial public offering price of $12.00 per share and accrued interest on the
debenture through January 31, 1997. See "Description of Capital Stock,"
"Underwriting" and Notes 1, 6 and 7 of Notes to Financial Statements.
 
                                  THE COMPANY
 
     Biosite Diagnostics Incorporated ("Biosite" or the "Company") develops,
manufactures and markets rapid, accurate and cost-effective diagnostic products
that improve the quality of patient care and simplify the practice of laboratory
medicine. The Company believes that its Immediate Response Diagnostics can have
an important impact on medical decisions, patient care and the cost of medical
treatment. The Company's first product, Triage Panel for Drugs of Abuse ("Triage
DOA"), a small self-contained test capable of detecting a broad spectrum of
commonly overdosed prescription and illicit drugs in approximately 10 minutes,
is used by over 2,600 hospitals and emergency departments. Since its
introduction in 1992, over 4.2 million Triage DOA panels have been sold
worldwide for use in hospital emergency department screening and workplace
testing. The Company is developing several additional products for applications
where the Company believes its Immediate Response Diagnostics can play an
important role in improving patient care. Products under development include
tests that are intended to aid in the diagnosis of heart attacks, the dosing of
certain therapeutic drugs, the management of certain chronic diseases and the
detection of certain bacterial and parasitic infections.
 
     In 1995, the worldwide market for immunoassay tests exceeded $5.1 billion.
Although early manual immunoassay tests provided high levels of sensitivity for
analyte detection, these tests suffered from short shelf lives, long reaction
times, a need for radioactive labels and inconsistent results. In response to
these limitations, automated immunoassay analyzers have been developed to
simplify the performance of antibody-based tests. However, these machines are
large and complex, have lengthy turnaround times and require high volumes of
sample throughput to justify the significant investment in equipment and
technical staff.
 
     In recent years, there has been a continuing shift from the use of such
analyzers to more technologically advanced point-of-care tests that can be
performed in a matter of minutes. Although certain simple single analyte
diagnostic tests have been developed, such tests have remained incapable of
precise, multi-analyte detection or highly sensitive quantitative measurements.
As a result, medical tests that require multiple analytes or precise
quantitation of the target analyte have remained the domain of immunoassay
analyzers. The Company believes that there is significant market potential for
advanced point-of-care diagnostic products that provide quick and accurate
diagnosis during a patient visit, shortening the decision time to medical
intervention and minimizing the need for additional patient follow-up, thereby
reducing overall health care delivery costs.
 
     Biosite's Immediate Response Diagnostics technology is based on proprietary
advances in several core scientific and engineering disciplines, including
antibody development and engineering, analyte cloning and synthesis, signaling
chemistry and micro capillary fluidics, which make possible the development and
manufacture of rapid, accurate and cost-effective point-of-care diagnostics. The
Company has utilized its core technologies to develop two distinct product
platforms: the Triage Panel for qualitative visual readings and the Triage
CareLink System for quantitative measurements. The Company's products are
designed to measure either a single analyte or multiple analytes simultaneously
and to allow for the qualitative or quantitative analysis of various samples,
including urine, serum, plasma, whole blood and stool. Both of the Company's
product platforms are designed to provide rapid results, ease of use, high
analytical accuracy and the capability of performing multiple analyses in a
reliable and cost-effective testing device.
 
                                        3
<PAGE>   7
 
     Triage DOA, based on the Company's Triage Panel platform, is a qualitative,
single sample urine screen that identifies eight commonly abused prescription
and illicit drugs or drug classes and provides results in approximately 10
minutes. Emergency physicians have estimated that drug abuse is implicated in
5-10% of the emergency department visits in the United States each year. The
Company believes that it is a leading provider of immunoassays for drug
screening in hospitals. In 1995, sales of Triage DOA product lines exceeded $25
million. The Company has additional Triage Panel products under development for
the qualitative detection of bacterial and parasitic infections.
 
     The Triage CareLink System under development is designed to provide rapid,
quantitative results for immunoassay tests. The Triage CareLink System consists
of two parts: a small single-use test cartridge and a proprietary portable
fluorescent meter designed to read the sample at the point-of-care. The Company
currently is developing two applications using this technology: Triage Cardiac,
to quantify a panel of cardiac markers implicated in acute myocardial infarction
("AMI"), and Triage Transplant, to monitor the concentration of cyclosporine, an
immunosuppressant drug prescribed for organ transplant recipients to prevent
organ rejection.
 
     The Company has entered into several strategic arrangements with major
pharmaceutical and diagnostic companies, including Sandoz Pharma Ltd. ("Sandoz")
for the development of Triage Transplant; LRE Relais + Electronik GmbH ("LRE")
for the development of the fluorescent meter used in the Triage CareLink System;
and Merck KGaA ("Merck") and ARKRAY KDK Corporation, formerly known as Kyoto
Dai-ichi Kagaku Co., Ltd. ("KDK"), for the development of Triage Cardiac. In
addition, the Company uses Curtin Matheson Scientific, Inc., a subsidiary of
Fisher International Inc. ("CMS"), to distribute Triage DOA to U.S.
hospital-based laboratories and emergency departments and has built a small
direct sales force to address the workplace testing segment of the market for
Triage DOA. Merck is the exclusive distributor of Triage DOA in certain
countries in Europe, Latin America, the Middle East and Africa.
 
     The Company was incorporated in Delaware in 1988. The Company's executive
offices are located at 11030 Roselle Street, San Diego, California 92121, and
its telephone number is (619) 455-4808.
 
                                  THE OFFERING
 
<TABLE>
<S>                                            <C>
Common Stock offered by the Company..........  2,000,000 shares
Common Stock to be outstanding after the
  offering...................................  11,885,168 shares(1)
Use of proceeds..............................  For expansion of sales and marketing
                                               activities, research and development,
                                               expansion and development of manufacturing
                                               capabilities, working capital and general
                                               corporate purposes.
Proposed Nasdaq symbol.......................  BSTE
</TABLE>
 
- ---------------
(1) Excludes 1,180,204 shares reserved for issuance upon exercise of stock
    options outstanding at November 30, 1996. See "Capitalization,"
    "Management -- Executive Compensation" and Note 7 of Notes to Financial
    Statements.
 
                                        4
<PAGE>   8
 
                         SUMMARY FINANCIAL INFORMATION
                     (IN THOUSANDS, EXCEPT PER SHARE DATA)
 
<TABLE>
<CAPTION>
                                                                                                NINE MONTHS
                                                      YEAR ENDED DECEMBER 31,               ENDED SEPTEMBER 30,
                                          -----------------------------------------------   -------------------
                                           1991      1992      1993      1994      1995      1995        1996
                                          -------   -------   -------   -------   -------   -------     -------
<S>                                       <C>       <C>       <C>       <C>       <C>       <C>         <C>
STATEMENT OF INCOME DATA:
Net sales...............................  $    --   $ 2,920   $ 9,866   $16,320   $25,147   $18,236     $20,225
Cost of sales...........................       --     1,612     3,268     4,416     5,649     3,781       4,318
                                          -------   -------   -------   -------   -------   -------     -------
Gross profit............................       --     1,308     6,598    11,904    19,498    14,455      15,907
Research and development................    2,793     2,593     2,796     3,836     6,553     4,602       6,515
Selling, general and administrative.....    1,771     3,622     4,841     5,960     7,134     5,203       6,116
                                          -------   -------   -------   -------   -------   -------     -------
Total operating expenses................    4,564     6,215     7,637     9,796    13,687     9,805      12,631
Income (loss) from operations...........   (4,564)   (4,907)   (1,039)    2,108     5,811     4,650       3,276
Interest and other income, net..........      260       630       613       649     1,647     1,253       1,441
Settlement of patent matters............       --        --        --      (338)   (1,217)     (743)     (2,368)
                                          -------   -------   -------   -------   -------   -------     -------
Income (loss) before benefit (provision)
  for income taxes......................   (4,304)   (4,277)     (426)    2,419     6,241     5,160       2,349
Benefit (provision) for income taxes....       --        --        --       (63)    1,667      (132)        264
                                          -------   -------   -------   -------   -------   -------     -------
Net income (loss).......................  $(4,304)  $(4,277)  $  (426)  $ 2,356   $ 7,908   $ 5,028     $ 2,613
                                          =======   =======   =======   =======   =======   =======     =======
Net income (loss) per share.............  $ (0.61)  $ (0.49)  $ (0.04)  $  0.22   $  0.74   $  0.47     $  0.24
                                          =======   =======   =======   =======   =======   =======     =======
Common and common equivalent shares used
  in computing per share amounts(1).....    7,058     8,754    10,098    10,553    10,766    10,721      10,832
</TABLE>
 
<TABLE>
<CAPTION>
                                                                                     SEPTEMBER 30, 1996
                                                                                 --------------------------
                                                                                 ACTUAL      AS ADJUSTED(2)
                                                                                 -------     --------------
<S>                                                                              <C>         <C>
BALANCE SHEET DATA:
Cash, cash equivalents and short-term investments..............................  $10,169        $ 31,789
Working capital................................................................   13,967          35,667
Total assets...................................................................   28,968          50,588
Notes payable and capital lease obligations, less current portion..............    3,234           2,234
Stockholders' equity...........................................................   21,181          43,881
</TABLE>
 
- ---------------
(1) Computed on the basis described in Note 1 of Notes to Financial Statements.
 
(2) Adjusted to reflect the sale by the Company of 2,000,000 shares of Common
    Stock offered hereby at an assumed initial public offering price of $12.00
    per share and the application of the estimated net proceeds therefrom. See
    "Use of Proceeds" and "Capitalization."
 
                                        5
<PAGE>   9
 
     The discussion in this Prospectus contains forward-looking statements that
involve risks and uncertainties. The Company's actual results could differ
materially from those discussed here. Factors that could cause or contribute to
such differences include, but are not limited to, those discussed in the
sections entitled "Risk Factors," "Management's Discussion and Analysis of
Financial Condition and Results of Operations" and "Business," as well as those
discussed elsewhere in this Prospectus.
 
                                  RISK FACTORS
 
     In evaluating the Company's business, prospective investors should consider
carefully the following risk factors in addition to the other information
presented in this Prospectus.
 
DEPENDENCE ON DEVELOPMENT AND INTRODUCTION OF NEW PRODUCTS
 
     Except for Triage DOA, all of the Company's products are still under
development, and there can be no assurance that such products will be
successfully developed or commercialized on a timely basis, if at all. The
Company believes that its revenue growth and profitability will substantially
depend upon its ability to complete development of and successfully introduce
these new products. In addition, the successful development of some of these new
products will depend on the development of new technologies, including the
Triage CareLink System's fluorescent meter and assay devices. The Company will
be required to undertake time-consuming and costly development activities and
seek regulatory approval for these new products. There can be no assurance that
the Company will not experience difficulties that could delay or prevent the
successful development, introduction and marketing of these new products, that
regulatory clearance or approval of any new products will be granted by the U.S.
Food and Drug Administration ("FDA") or foreign regulatory authorities on a
timely basis, if at all, or that the new products will be successfully
commercialized. The Company has limited resources to devote to the development
of all its products and consequently a delay in the development of one product
may delay the development of other products. In order to successfully
commercialize any new products, the Company will be required to establish and
maintain reliable, cost-efficient, high-volume manufacturing capacity for such
products. If the Company is unable, for technological or other reasons, to
complete the development, introduction or scale-up of manufacturing of any new
product or if any new product is not approved for marketing or does not achieve
a significant level of market acceptance, the Company's business, financial
condition and results of operations would be materially and adversely affected.
See "Business -- Products and Products Under Development," "-- Manufacturing"
and "-- Government Regulation."
 
FUTURE OPERATING RESULTS AND QUARTERLY FLUCTUATIONS
 
     The Company first achieved profitability in fiscal 1994 and prior to that
time incurred significant operating losses. There can be no assurance that the
Company will remain profitable on a quarterly or annual basis in the future. The
Company believes that future operating results will be subject to quarterly
fluctuations due to a variety of factors, including whether and when new
products are successfully developed and introduced by the Company, market
acceptance of current or new products, regulatory delays, product recalls,
manufacturing delays, shipment problems, seasonal customer demand, the timing of
significant orders, changes in reimbursement policies, competitive pressures on
average selling prices, changes in the mix of products sold and patent
conflicts. Operating results would also be adversely affected by a downturn in
the market for the Company's current and future products, if any, order
cancelations or order rescheduling. Because the Company is continuing to
increase its operating expenses for personnel and new product development, the
Company's operating results would be adversely affected if its sales did not
correspondingly increase or if its product development efforts are unsuccessful
or subject to delays. See "Management's Discussion and Analysis of Financial
Condition and Results of Operations."
 
NEAR-TERM DEPENDENCE ON TRIAGE DOA; RISK OF OBSOLESCENCE; CONCENTRATION OF
PRODUCT SALES
 
     Sales of Triage DOA have to date accounted for all of the Company's sales.
The Company expects its revenue and profitability will substantially depend on
the sale of Triage DOA for the foreseeable future. A
 
                                        6
<PAGE>   10
 
reduction in demand for Triage DOA would have a material adverse effect on the
Company's business, financial condition and results of operations. The Company
believes that growth in sales of Triage DOA will slow as the available U.S.
market becomes saturated. Competitive pressures could also erode the Company's
profit margins for Triage DOA. The Company's continued growth will depend on its
ability to successfully develop and commercialize other products and to gain
additional acceptance of Triage DOA. There can be no assurance that the Company
will be able to successfully develop and commercialize new products or that the
Company will be able to maintain or expand its share of the drug testing market.
Technological change or the development of new or improved diagnostic
technologies could result in the Company's products becoming obsolete or
noncompetitive. See "Business -- Products and Products Under Development."
 
DEPENDENCE ON OTHERS
 
     Biosite's strategy for the research, development, commercialization and
distribution of certain of its products entails entering into various
arrangements with corporate partners, licensors, licensees and others, and is
dependent upon the success of these parties in performing their
responsibilities. There can be no assurance that such parties will perform their
obligations as expected or that any revenue will be derived from such
arrangements.
 
     The Company relies upon distributors and its own sales force to distribute
Triage DOA and may rely upon distributors to distribute products under
development. Triage DOA is currently marketed pursuant to exclusive distribution
agreements in the U.S. medical market by CMS (which accounted for 80% of product
sales in the first nine months of 1996) and in certain countries in Europe,
Latin America, the Middle East and Africa by Merck. The CMS distribution
agreement has minimum quarterly sales milestones which, if the milestones are
not met, allows the Company to terminate the agreement, obligates CMS to pay
Biosite a penalty and allows the Company to appoint a new distributor or to sell
Triage DOA directly in the U.S. medical market. The Company anticipates that it
may enter into additional distribution agreements with respect to its products
currently under development and products that it develops in the future, if any
of such products receive the requisite regulatory clearance or approvals. There
can be no assurance that the Company will be able to enter into such agreements
on acceptable terms, if at all.
 
     Biosite has also entered into agreements with, among others, Merck, Sandoz
and KDK for the development and marketing of products. The agreements are
subject to certain rights of termination, and there can be no assurance that any
such agreement will not be terminated. There can be no assurance that the
Company's collaborators will abide by their contractual obligations or will not
discontinue or sell their current lines of business. Merck has informed the
Company that Merck is considering assigning its rights concerning the marketing
of Triage Cardiac either to a third party or back to the Company. There also can
be no assurance that any of the research for which the Company receives or
provides funding will lead to the development of products. The Company intends
to enter into additional development and marketing agreements. However, there
can be no assurance that the Company will be able to enter into such agreements
on acceptable terms, if at all.
 
     If any of the Company's distribution or marketing agreements are terminated
and the Company is unable to enter into replacement agreements or if the Company
elects to distribute new products directly, the Company would have to invest in
additional sales and marketing resources, including additional field sales
personnel, which would significantly increase future sales and marketing
expenses. The Company currently has limited experience in direct sales,
marketing and distribution of its products. There can be no assurance that the
Company's direct sales, marketing and distribution efforts would be successful
or that revenue from such efforts would exceed expenses. Further, there can be
no assurance that Biosite would be able to enter into new distribution or
marketing agreements on satisfactory terms, if at all.
 
     The Company is developing with LRE a hand-held point-of-care fluorescent
meter for use in Triage CareLink System products. The meter will be programmed
to run a specific test through the use of changeable proprietary software which
is also under development by LRE. There can be no assurance that LRE will
develop the hardware or software on schedule, if at all, or that new software
will be developed to permit the meter to be used for another Triage CareLink
System product. See "Business -- Strategic and Distribution Arrangements."
 
                                        7
<PAGE>   11
 
INTENSELY COMPETITIVE INDUSTRY; RAPID TECHNOLOGICAL CHANGE
 
     The market in which the Company competes is intensely competitive.
Biosite's competitors include health care companies that manufacture
laboratory-based tests and analyzers, as well as clinical and hospital-based
laboratories. Currently, the majority of diagnostic tests used by physicians and
other health care providers are performed by independent clinical and
hospital-based laboratories. The Company expects that these laboratories will
compete vigorously to maintain their dominance of the testing market. In order
to achieve market acceptance for its products, the Company will be required to
demonstrate that its products are an attractive alternative to testing performed
by clinical and hospital-based laboratories. This will require physicians to
change their established means of having such tests performed. There can be no
assurance that the Company's products will be able to compete with the testing
services provided by these laboratories. In addition, companies with a
significant presence in the diagnostic market, such as Abbott Laboratories,
Boehringer Mannheim GmbH ("Boehringer Mannheim"), Chiron Diagnostics, Clinical
Diagnostic Systems, a division of Johnson & Johnson, DADE International, and
Roche Biosciences, Inc., have developed or are developing diagnostic products
that do or will compete with the Company's products. These competitors have
substantially greater financial, technical, research and other resources and
larger, more established marketing, sales, distribution and service
organizations than the Company. Moreover, such competitors offer broader product
lines and have greater name recognition than the Company, and offer discounts as
a competitive tactic. In addition, several smaller companies are currently
making or developing products that compete with or will compete with those of
the Company. There can be no assurance that the Company's competitors will not
succeed in developing or marketing technologies or products that are more
effective or commercially attractive than the Company's current or future
products, or that would render the Company's technologies and products obsolete.
Moreover, there can be no assurance that the Company will have the financial
resources, technical expertise or marketing, distribution or support
capabilities to compete successfully in the future. In addition, there can be no
assurance that competitors, many of which have made substantial investments in
competing technologies that may be more effective than the Company's
technologies, will not prevent, limit or interfere with the Company's ability to
make, use or sell its products either in the United States or in international
markets. See "Business -- Products and Products Under Development,"
"-- Technology" and "-- Competition."
 
UNCERTAINTY OF PATENT AND PROPRIETARY TECHNOLOGY PROTECTION; LICENSE OF
TECHNOLOGY OF THIRD PARTIES
 
     The Company's ability to compete effectively will depend in part on its
ability to develop and maintain proprietary aspects of its technology, and to
operate without infringing the proprietary rights of others or to obtain rights
to such proprietary rights. Biosite has U.S. and foreign issued patents and is
currently prosecuting patent applications in the United States and with certain
foreign patent offices. There can be no assurance that any of the Company's
pending patent applications will result in the issuance of any patents or that,
if issued, any such patents will offer protection against competitors with
similar technologies. There can be no assurance that any patents issued to the
Company will not be challenged, invalidated or circumvented in the future or
that the rights created thereunder will provide a competitive advantage.
 
     Litigation may be necessary to enforce any patents issued to the Company,
to protect trade secrets or know-how owned by the Company or to determine the
enforceability, scope and validity of the proprietary rights of others. In March
1996, the Company settled a potential patent infringement claim by obtaining a
license to the contested patent in return for a one-time payment of $2.2
million. In September 1996, the Company settled a patent infringement lawsuit
filed by Abbott Laboratories and obtained a license to the contested patent in
return for the payment of $5.5 million and the agreement to pay certain
royalties. There can be no assurance that the Company will not in the future
become subject to patent infringement claims and litigation or interference
proceedings conducted in the U.S. Patent and Trademark Office ("USPTO") to
determine the priority of inventions. The defense and prosecution of
intellectual property suits, USPTO interference proceedings, and related legal
and administrative proceedings will result in substantial expense to the Company
and significant diversion of effort by the Company's technical and management
personnel. An adverse determination in litigation or interference proceedings to
which the Company may become a party could subject the Company to significant
liabilities to third parties. Further, either as the result of such
 
                                        8
<PAGE>   12
 
litigation or proceedings or otherwise, the Company may be required to seek
licenses from third parties which may not be available on commercially
reasonable terms, if at all.
 
     Triage DOA and products under development may incorporate technologies that
are the subject of patents issued to, and patent applications filed by, others.
The Company has obtained licenses for certain technologies. However, there can
be no assurance that the Company will be able to obtain licenses for technology
patented by others on commercially reasonable terms, if at all, that it will be
able to develop alternative approaches if unable to obtain licenses or that the
Company's current and future licenses will be adequate for the operation of
Biosite's business. The failure to obtain necessary licenses or to identify and
implement alternative approaches would prevent the Company from commercializing
certain of its products under development and would have a material adverse
effect on the Company's business, financial condition and results of operations.
 
     Biosite is aware of a U.S. patent owned by Celltech Limited ("Celltech")
relating to the manufacture of antibodies, such as those developed or being
developed by Biosite for several products, including Triage Cardiac. Biosite is
also aware that this patent is the subject of an interference proceeding in the
USPTO which was initiated in February 1991 with a patent application filed by
Genentech, Inc. ("Genentech"). In June 1996, the European Patent Office ("EPO")
invalidated, following an opposition, certain claims under Celltech's
corresponding EPO-granted patent which are relevant to Biosite's products and
products under development. Celltech has indicated that it will appeal such
decision. If it is determined that certain manufacturing aspects of Biosite's
antibodies are covered by patent claims stemming from the interference or if
Celltech were to have such claims upheld on appeal, Biosite may be required to
obtain a license under such patents and corresponding patents in other
countries. There can be no assurance that a license would be made available to
Biosite on commercially reasonable terms, if at all. If such license is required
and not obtained the Company might be prevented from using certain of its
technologies. The Company's failure to obtain any required licenses could have a
material adverse effect on the Company's business, financial condition and
results of operations.
 
     The Company also relies upon trade secrets, technical know-how and
continuing invention to develop and maintain its competitive position. There can
be no assurance that others will not independently develop substantially
equivalent proprietary information and techniques or otherwise gain access to
the Company's trade secrets or disclose such technology, that the Company can
meaningfully protect its right to its trade secrets, or that the Company will be
capable of protecting its rights to its trade secrets.
 
     Others may have filed and in the future are likely to file patent
applications that are similar or identical to those of the Company. To determine
the priority of inventions, the Company may have to participate in interference
proceedings declared by the USPTO that could result in substantial cost to the
Company. No assurance can be given that any patent application of another will
not have priority over patent applications filed by the Company.
 
     The commercial success of the Company also depends in part on the Company
neither infringing patents or proprietary rights of third parties nor breaching
any licenses that may relate to the Company's technologies and products. The
Company is aware of several third-party patents that relate to the Company's
technology. There can be no assurance that the Company does not or will not
infringe these patents, or other patents or proprietary rights of third parties.
In addition, the Company has received and may in the future receive notices
claiming infringement from third parties as well as invitations to take licenses
under third party patents. Any legal action against the Company or its
collaborative partners claiming damages and seeking to enjoin commercial
activities relating to the Company's products and processes affected by third
party rights, in addition to subjecting the Company to potential liability for
damages may require the Company or its collaborative partner to obtain a license
in order to continue to manufacture or market the affected products and
processes. There can be no assurance that the Company or its collaborative
partners would prevail in any such action or that any license (including
licenses proposed by third parties) required under any such patent would be made
available on commercially acceptable terms, if at all. There are a significant
number of U.S. and foreign patents and patent applications in the Company's
areas of interest, and the Company believes that there may be significant
litigation in the industry regarding patent and other intellectual property
rights. If the Company becomes involved in such litigation, it could consume a
substantial portion of the Company's managerial and financial resources, which
could have a material
 
                                        9
<PAGE>   13
 
adverse effect on the Company's business, financial condition and results of
operations. See "Business -- Proprietary Technology and Patents."
 
GOVERNMENT REGULATION
 
     The testing, manufacture and sale of the Company's products are subject to
regulation by numerous governmental authorities, principally the FDA and
corresponding state and foreign regulatory agencies. Pursuant to the Federal
Food, Drug, and Cosmetic Act, and the regulations promulgated thereunder, the
FDA regulates the preclinical and clinical testing, manufacture, labeling,
distribution and promotion of medical devices. Noncompliance with applicable
requirements can result in, among other things, fines, injunctions, civil
penalties, recall or seizure of products, total or partial suspension of
production, failure of the government to grant premarket clearance or premarket
approval for devices, withdrawal of marketing clearances or approvals, and
criminal prosecution. The FDA also has the authority to request recall, repair,
replacement or refund of the cost of any device manufactured or distributed by
the Company.
 
     Any devices manufactured or distributed by the Company pursuant to FDA
clearance or approvals are subject to pervasive and continuing regulation by the
FDA and certain state agencies. Before a new device can be introduced in the
market, the manufacturer must generally obtain FDA clearance of a 510(k)
notification or FDA approval of a pre-market approval ("PMA") application. The
PMA approval process is more expensive, uncertain and lengthy than the 510(k)
clearance process. The Company is uncertain of the regulatory path to market
that the FDA will ultimately apply to the Company's products currently in
development. Although Triage DOA received 510(k) clearance, a PMA may be
required for Triage Cardiac and Triage Transplant products now in development.
There can be no assurance that with respect to any of the Company's products in
development, the FDA will not determine that the Company must adhere to the more
costly, lengthy and uncertain PMA approval process. Modifications to a device
that is the subject of an approved PMA application, its labeling or
manufacturing process may require approval by the FDA of a PMA supplement or a
new PMA application. For any devices that are cleared through the 510(k)
process, modifications or enhancements that could significantly affect safety or
effectiveness, or constitute a major change in the intended use of the device,
will require new 510(k) submissions.
 
     There can be no assurance that the Company will be able to obtain necessary
regulatory approvals or clearances for its products on a timely basis, if at
all, and delays in receipt of or failure to receive such approvals or
clearances, the loss of previously received approvals or clearances, limitations
on intended use imposed as a condition of such approvals or clearances, or
failure to comply with existing or future regulatory requirements would have a
material adverse effect on the Company's business, financial condition and
results of operations.
 
     Before the manufacturer of a device can submit the device for FDA clearance
or approval, it generally must conduct a clinical investigation of the device.
Although clinical investigations of most devices are subject to the
investigational device exemption ("IDE") requirements, clinical investigations
of in vitro diagnostic ("IVD") tests, such as all of the Company's products and
products under development, are exempt from the IDE requirements, including the
need to obtain the FDA's prior approval, provided the testing is noninvasive,
does not require an invasive sampling procedure that presents a significant
risk, does not intentionally introduce energy into the subject, and is not used
as a diagnostic procedure without confirmation by another medically established
test or procedure. In addition, the IVD must be labeled for research use only
("RUO") or investigational use only ("IUO"), and distribution controls must be
established to assure that IVDs distributed for research or clinical
investigation are used only for those purposes.
 
     The Company intends to conduct clinical investigations of its products
under development, which will entail distributing them in the United States on
an IUO basis. There can be no assurance that the FDA would agree that the
Company's IUO distribution of its IVD products under development will meet the
requirements for IDE exemption. Furthermore, failure by the Company or the
recipients of its products under development to maintain compliance with the IDE
exemption requirements could result in enforcement action by the FDA, including,
among other things, the loss of the IDE exemption or the imposition of other
restrictions on the Company's distribution of its products under development,
which would adversely affect the Company's ability to conduct the clinical
investigations necessary to support marketing clearance or approval.
 
                                       10
<PAGE>   14
 
     Manufacturers of medical devices for marketing in the United States are
required to adhere to applicable regulations setting forth detailed current Good
Manufacturing Practices ("cGMP") requirements, which include testing, control
and documentation requirements. Manufacturers must also comply with Medical
Device Reporting ("MDR") requirements that a manufacturer report to the FDA any
incident in which its product may have caused or contributed to a death or
serious injury, or in which its product malfunctioned and would be likely to
cause or contribute to a death or serious injury upon recurrence. Labeling and
promotional activities are subject to scrutiny by the FDA and, in certain
circumstances, by the Federal Trade Commission. Current FDA enforcement policy
prohibits the marketing of approved medical devices for unapproved uses.
 
     The Company is subject to routine inspection by the FDA and certain state
agencies for compliance with cGMP requirements, MDR requirements and other
applicable regulations. The FDA has recently finalized changes to the cGMP
requirements, including the addition of design controls, that will likely
increase the cost of compliance. There can be no assurance that the Company will
not incur significant costs to comply with laws and regulations in the future or
that such laws and regulations will not have a material adverse effect upon the
Company's business, financial condition and results of operation.
 
     The use of Biosite's products is also affected by the Clinical Laboratory
Improvement Amendments of 1988 ("CLIA") and related federal and state
regulations which provide for regulation of laboratory testing. The scope of
these regulations includes quality control, proficiency testing, personnel
standards and federal inspections. CLIA categorizes tests as "waived,"
"moderately complex" or "highly complex," on the basis of specific criteria.
There can be no assurance that any future amendment of CLIA or the promulgation
of additional regulations impacting laboratory testing would not have a material
adverse effect on the Company's ability to market its products or on its
business, financial condition and results of operations.
 
DEPENDENCE ON SOLE-SOURCE SUPPLIERS
 
     Certain key components and raw materials used in the manufacture of Triage
DOA are currently provided by single-source vendors. Although the Company
believes that alternative sources for such components and raw materials are
available, any supply interruption in a sole-sourced component of raw material
would have a material adverse effect on the Company's ability to manufacture
Triage DOA until a new source of supply is qualified and, as a result, would
have a material adverse effect on the Company's business, financial condition
and results of operations. In addition, an uncorrected impurity or supplier's
variation in a raw material, either unknown to the Company or incompatible with
the Company's Triage DOA manufacturing process, could have a material adverse
effect on the Company's ability to manufacture products. The Company currently
has under development products other than Triage DOA which, if developed, may
require that the Company enter into additional supplier arrangements. There can
be no assurance that the Company will be able to enter into additional supplier
arrangements on commercially reasonable terms, if at all. Failure to obtain a
supplier for the manufacture of its future products, if any, would have a
material adverse effect on the Company's business, financial condition and
results of operations.
 
     If successfully developed, the Company expects to rely upon LRE for
production of the fluorescent meter to be used in connection with its Triage
CareLink System platform of products currently under development. The Company's
dependence upon LRE for the manufacture of such a meter may adversely affect the
Company's profit margins, its ability to develop and manufacture products on a
timely and competitive basis, the timing of market introductions and subsequent
sales of products incorporating the LRE meter. See "Business -- Strategic and
Distribution Arrangements."
 
LIMITED MANUFACTURING EXPERIENCE; RISK OF MANUFACTURING SCALE-UP
 
     To be successful, the Company must manufacture its current and future
products in compliance with regulatory requirements, in sufficient quantities
and on a timely basis, while maintaining product quality and acceptable
manufacturing costs. The Company has limited experience manufacturing products
other than Triage DOA. To achieve the level of production necessary for
commercialization of Biosite's products under development, the Company will need
to scale-up current manufacturing capabilities. Significant additional work will
be required for the scaling-up of each potential Biosite product prior to
commercialization, and there can be no assurance that such work can be completed
successfully. In addition, although the Company expects
 
                                       11
<PAGE>   15
 
that certain of its products under development will share certain production
attributes with Triage DOA, production of such products may require the
development of new manufacturing technologies and expertise. There can be no
assurance that such products can be manufactured by the Company or any other
party at a cost or in quantities to make such products commercially viable. If
the Company is unable to develop or contract for manufacturing capabilities on
acceptable terms for its products under development, the Company's ability to
conduct preclinical and clinical testing will be adversely affected, resulting
in the delay of submission of products for regulatory clearance or approval and
initiation of new development programs, which would have a material adverse
effect on the Company's business, financial condition and results of operations.
See "Business -- Manufacturing."
 
     The Company anticipates making significant expenditures to develop high
volume manufacturing capabilities required for each of its products currently
under development, if such products are successfully developed. There can be no
assurance that manufacturing and quality control problems will not arise as the
Company attempts to scale-up its manufacturing or that such scale-up can be
achieved in a timely manner or at a commercially reasonable cost, if at all.
 
     The Company's manufacturing facilities and those of its contract
manufacturers are or will be subject to periodic regulatory inspections by the
FDA and other federal and state regulatory agencies and such facilities are
subject to cGMP requirements of the FDA. There can be no assurance that the
Company or its contractors will satisfy such regulatory requirements, and any
failure to do so would have a material adverse effect on the Company's business,
financial condition and results of operations.
 
UNCERTAINTY RELATING TO THIRD PARTY REIMBURSEMENT AND POTENTIAL COST CONSTRAINTS
 
     In the United States, health care providers that purchase Triage DOA and
other diagnostic products, such as hospitals and physicians, generally rely on
third party payors, principally private health insurance plans, federal Medicare
and state Medicaid, to reimburse all or part of the cost of the procedure. Such
third party payors can affect the pricing or the relative attractiveness of the
Company's products by regulating the maximum amount of reimbursement provided by
such payors for testing services. In addition, the tests performed by public
health departments, corporate wellness programs and other large volume users in
the drug screening market are generally not subject to reimbursement. Further,
certain health care providers are moving towards a managed care system in which
such providers contract to provide comprehensive health care for a fixed cost
per patient. The Company is unable to predict what changes will be made in the
reimbursement methods utilized by third party payors. The Company could be
adversely affected by changes in reimbursement policies of governmental or
private health care payors, particularly to the extent any such changes affect
reimbursement for procedures in which the Company's products are used. Third
party payors are increasingly scrutinizing and challenging the prices charged
for medical products and services. Decreases in reimbursement amounts for tests
performed using the Company's products may decrease amounts physicians and other
practitioners are able to charge patients, which in turn may adversely affect
the Company's ability to sell its products on a profitable basis. Failure by
physicians and other users to obtain reimbursement from third party payors, or
changes in government and private third party payors' policies toward
reimbursement of tests utilizing the Company's products could have a material
adverse effect on the Company's business, financial condition or results of
operation. Given the efforts to control and reduce health care costs in the
United States in recent years, there can be no assurance that currently
available levels of reimbursement will continue to be available in the future
for the Company's existing products or products under development.
 
     In addition, market acceptance of the Company's products in international
markets is dependent, in part, upon the availability of reimbursement within
prevailing health care payment systems. Reimbursement and health care payment
systems in international markets vary significantly by country, and include both
government sponsored health care and private insurance.
 
     The Company believes that the overall escalating cost of medical products
and services has led to and will continue to lead to increased pressures on the
health care industry, both foreign and domestic, to reduce the cost of products
and services, including products offered by the Company. There can be no
assurance that third party reimbursement and coverage will be available or
adequate in either U.S. or foreign markets, that
 
                                       12
<PAGE>   16
 
current reimbursement amounts will not be decreased in the future or that future
legislation, regulation or reimbursement policies of third party payors will not
otherwise adversely affect the demand for the Company's products or its ability
to sell its products on a profitable basis.
 
POSSIBLE FUTURE CAPITAL REQUIREMENTS
 
     While the Company believes that its available cash, cash from operations
and funds from existing credit arrangements, together with the proceeds of this
offering, will be sufficient to satisfy its funding needs for at least the next
24 months, there can be no assurance the Company will not require additional
capital. The Company's future liquidity and capital funding requirements will
depend on numerous factors, including the extent to which the Company's products
under development are successfully developed and gain market acceptance, the
timing of regulatory actions regarding the Company's potential products, the
costs and timing of expansion of sales, marketing and manufacturing activities,
procurement and enforcement of patents important to the Company's business,
results of clinical investigations and competition. There can be no assurance
that such additional capital, if needed, will be available on terms acceptable
to the Company, if at all. Certain funding arrangements may require the Company
to relinquish its rights to certain of its technologies, products or marketing
territories. Furthermore, any additional equity financing may be dilutive to
stockholders, and debt financing, if available, may include restrictive
covenants. The failure by the Company to raise capital on acceptable terms when
needed could have a material adverse effect on the Company's business, financial
condition and results of operations. See "Use of Proceeds" and "Management's
Discussion and Analysis of Financial Condition and Results of Operations --
Liquidity and Capital Resources."
 
MANAGEMENT OF GROWTH; DEPENDENCE ON KEY PERSONNEL
 
     The Company anticipates increased growth in the number of its employees,
the scope of its operating and financial systems and the geographic area of its
operations as new products are developed and commercialized. This growth will
result in an increase in responsibilities for both existing and new management
personnel. The Company's ability to manage growth effectively will require it to
continue to implement and improve its operational, financial and management
information systems and to train, motivate and manage its employees. There can
be no assurance that the Company will be able to manage its expansion, and a
failure to do so could have a material adverse effect on the Company's business,
financial condition and results of operations.
 
     The Company's future success depends in part on the continued service of
its key technical, sales, marketing and executive personnel, and its ability to
identify and hire additional qualified personnel. Competition for such personnel
is intense and there can be no assurance that the Company can retain existing
personnel or identify or hire additional personnel.
 
PRODUCT LIABILITY
 
     The testing, manufacturing and marketing of medical diagnostic devices such
as Triage DOA, as well as the Company's products currently under development,
entail an inherent risk of product liability claims. To date, the Company has
not experienced any material product liability claims, but any such claims
arising in the future could have a material adverse effect on the Company's
business, financial condition and results of operations. Potential product
liability claims may exceed the amount of the Company's insurance coverage or
may be excluded from coverage under the terms of the policy. There can be no
assurance that the Company's existing insurance can be renewed at a cost and
level of coverage comparable to that presently in effect, if at all. In the
event that the Company is held liable for a claim against which it is not
indemnified or for damages exceeding the limits of its insurance coverage, such
claim could have a material adverse effect on the Company's business, financial
condition and result of operations.
 
LACK OF PRIOR PUBLIC MARKET AND POSSIBLE VOLATILITY OF STOCK PRICE
 
     Prior to this offering, there has been no public market for the Common
Stock and there can be no assurance that an active public market for the Common
Stock will develop or be sustained after this offering. The initial public
offering price will be determined through negotiations between the Company and
the Underwriters. See "Underwriting." In addition, the securities markets have
from time to time experienced significant price and volume fluctuations that are
unrelated to the operating performance of particular companies. The market
prices of the common stock of many publicly held medical device companies have
in
 
                                       13
<PAGE>   17
 
the past been, and can in the future be expected to be, especially volatile.
Announcements of technological innovations or new products by the Company or its
competitors, clinical investigation results, release of reports by securities
analysts, developments or disputes concerning patents or proprietary rights,
regulatory developments, changes in regulatory or medical reimbursement
policies, economic and other external factors, as well as period-to-period
fluctuations in the Company's financial results, may have a significant impact
on the market price of the Common Stock.
 
SHARES ELIGIBLE FOR FUTURE SALE
 
     Future sales of Common Stock by existing stockholders under Rules 144 and
701 of the Securities Act of 1933, as amended (the "Securities Act") or through
the exercise of outstanding registration rights or otherwise could have an
adverse effect on the price of the Common Stock. The 2,000,000 shares offered
hereby will be eligible for resale in the public market immediately following
this offering. Upon the commencement of this offering, an additional 451,030
shares will be eligible for resale in the public market. Additionally, 1,764,796
and 7,384,595 shares of Common Stock will be eligible for sale in the public
market 120 days and 180 days, respectively, after the date of this Prospectus,
upon expiration of lockup agreements, in reliance on Rule 144 or Rule 701 under
the Securities Act. The Company intends to register approximately 2,215,960
shares of Common Stock reserved for issuance under its stock plans as soon as
practicable following the date of this Prospectus. Stockholders who, after
consummation of this offering, will hold over 8,400,000 shares of Common Stock
have rights to require the Company to register their shares for future sale. See
"Description of Capital Stock -- Registration Rights" and "Shares Eligible for
Future Sale."
 
BROAD DISCRETION OF MANAGEMENT TO ALLOCATE OFFERING PROCEEDS
 
     The Company anticipates that the proceeds of this offering will be used to
fund expansion of sales and marketing activities, to fund research and
development activities, to expand and develop manufacturing capabilities, and to
finance working capital and general corporate requirements. The amounts
identified for the foregoing uses under "Use of Proceeds" in this Prospectus are
estimates, and the amounts actually expended for each such purpose and the
timing of such expenditures may vary depending upon numerous factors. The
Company's management will have broad discretion in determining the amount and
timing of expenditures and in allocating the proceeds of this offering. Such
discretion will be particularly broad with respect to that portion of the
proceeds available for working capital and general corporate purposes. See "Use
of Proceeds."
 
CONTROL BY DIRECTORS, EXECUTIVE OFFICERS, PRINCIPAL STOCKHOLDERS AND AFFILIATED
ENTITIES
 
     The Company's directors, executive officers, principal stockholders and
entities affiliated with them will, in the aggregate, beneficially own
approximately 63.0% of the Company's outstanding Common Stock following the
completion of this offering. These stockholders, if acting together, would be
able to control substantially all matters requiring approval by the stockholders
of the Company, including the election of directors and the approval of mergers
or other business combination transactions. See "Principal Stockholders."
 
EFFECT OF CERTAIN CHARTER AND BYLAW PROVISIONS AND DELAWARE LAW
 
     Certain provisions of the Company's Certificate of Incorporation and Bylaws
may have the effect of making it more difficult for a third party to acquire, or
of discouraging a third party from attempting to acquire control of the Company.
Such provisions could limit the price that certain investors might be willing to
pay in the future for shares of the Company's Common Stock. Certain of these
provisions allow the Company to issue Preferred Stock without any vote or
further action by the stockholders, provide for a classified board of directors,
eliminate the right of stockholders to call special meetings of stockholders or
to act by written consent without a meeting. These provisions may make it more
difficult for stockholders to take certain corporate actions and could have the
effect of delaying or preventing a change in control of the Company. See
"Management" and "Description of Capital Stock."
 
DILUTION; ABSENCE OF DIVIDENDS
 
     Purchasers of shares of Common Stock in this offering will incur immediate,
substantial dilution in net tangible book value per share. The Company has never
paid cash dividends on its capital stock and does not anticipate paying any cash
dividends in the foreseeable future. See "Dilution" and "Dividend Policy."
 
                                       14
<PAGE>   18
 
                                USE OF PROCEEDS
 
     The proceeds to the Company from the sale of the shares of Common Stock
offered by the Company hereby are estimated to be approximately $21,620,000
($24,968,000 if the Underwriters' over-allotment option is exercised in full),
at an assumed initial public offering price of $12.00 per share, and after
deducting estimated underwriting discounts and commissions and estimated
offering expenses.
 
     The Company anticipates that it will use approximately $7.0 million of the
net proceeds of this offering to expand sales and marketing activities (which
are expected to include the development of direct sales capabilities in selected
markets), approximately $2.0 million to fund the Company's research and
development efforts, and approximately $4.0 million for expansion and
development of manufacturing capabilities in connection with the launch of the
Company's products currently under development. The Company anticipates using
the remaining net proceeds for working capital and general corporate purposes.
The Company also may use a portion of the net proceeds to acquire businesses,
technologies or products complementary to the Company's business, although the
Company currently has no specific plans or commitments in this regard. The
amounts actually expended for each purpose may vary significantly depending upon
numerous factors, including the progress of the Company's research and
development, and the costs and timing of expansion of marketing, sales and
manufacturing activities, and hence the Company's management will retain broad
discretion in the allocation of a substantial portion of the net proceeds.
Pending such uses, the Company intends to invest the net proceeds of this
offering in interest-bearing, investment grade securities. The Company believes
that its available cash, cash from operations and funds from existing credit
arrangements, together with the proceeds of this offering, will be sufficient to
satisfy its funding needs for at least the next 24 months.
 
                                DIVIDEND POLICY
 
     The Company has never declared or paid dividends on its capital stock and
does not anticipate paying any dividends in the foreseeable future. The Company
currently intends to retain its earnings, if any, for the operation of its
business.
 
                                       15
<PAGE>   19
 
                                 CAPITALIZATION
 
     The following table sets forth as of September 30, 1996 (i) the
capitalization of the Company, (ii) the pro forma capitalization of the Company,
after giving effect to the conversion of all series of Preferred Stock into
Common Stock and the conversion of a $1.0 million debenture and related interest
thereon through January 31, 1997 into 92,222 shares of Common Stock at the
assumed initial public offering price of $12.00 per share upon the closing of
this offering, and (iii) the pro forma capitalization of the Company, as
adjusted to give effect to the receipt of the net proceeds from the sale of the
2,000,000 shares of Common Stock offered hereby at an assumed initial public
offering price of $12.00 per share and the application of the estimated net
proceeds therefrom.
 
<TABLE>
<CAPTION>
                                                                        SEPTEMBER 30, 1996
                                                                 ---------------------------------
                                                                                        PRO FORMA
                                                                 ACTUAL    PRO FORMA   AS ADJUSTED
                                                                 -------   ---------   -----------
                                                                          (IN THOUSANDS)
<S>                                                              <C>       <C>         <C>
Notes payable, less current portion(1).........................  $ 3,234    $ 2,234      $ 2,234
                                                                 -------    -------      -------
Stockholders' equity:
  Preferred Stock, $.01 par value; 8,328,847 shares authorized
     and 8,328,847 shares outstanding actual; 5,000,000 shares
     authorized and no shares outstanding, pro forma and pro
     forma as adjusted.........................................       83         --           --
  Common Stock, $.01 par value; 12,000,000 shares authorized
     and 1,460,093 outstanding actual; 25,000,000 shares
     authorized and 9,881,162 shares outstanding pro forma;
     25,000,000 shares authorized and 11,881,162 shares
     outstanding pro forma as adjusted(2)......................       15         99          119
  Additional paid-in capital...................................   21,686     22,792       44,392
  Unrealized net loss on marketable securities, net of related
     tax.......................................................      (10)       (10)         (10)
  Deferred compensation........................................      (48)       (48)         (48)
  Accumulated deficit..........................................     (545)      (572)        (572)
                                                                 -------    -------      -------
          Total stockholders' equity...........................  $21,181    $22,261      $43,881
                                                                 -------    -------      -------
          Total capitalization.................................  $24,415    $24,495      $46,115
                                                                 =======    =======      =======
</TABLE>
 
- ---------------
(1) See Note 6 of Notes to Financial Statements for a description of the
    Company's long-term commitments.
 
(2) Excludes 1,180,204 shares of Common Stock reserved for issuance upon
    exercise of stock options outstanding at November 30, 1996. See
    "Management -- Executive Compensation" and Note 7 of Notes to Financial
    Statements.
 
                                       16
<PAGE>   20
 
                                    DILUTION
 
     The pro forma net tangible book value of the Company's Common Stock as of
September 30, 1996 was approximately $17,803,000, or $1.80 per share. Pro forma
net tangible book value per share represents the amount of the Company's total
tangible assets less total liabilities, divided by the number of shares of
Common Stock outstanding, after giving effect to the conversion of all series of
Preferred Stock into Common Stock and the conversion of a $1.0 million debenture
and related interest through January 31, 1997 into 92,222 shares of Common Stock
at the assumed initial public offering price of $12.00 per share upon the
closing of this offering. After giving effect to the sale of the 2,000,000
shares of Common Stock offered hereby by the Company at an assumed initial
public offering price of $12.00 per share and after deducting underwriting
discounts and commissions and estimated offering expenses payable by the
Company, the pro forma net tangible book value of the Company at September 30,
1996 would have been approximately $39,423,000 or $3.32 per share. This
represents an immediate increase in pro forma net tangible book value of $1.52
per share to existing stockholders and an immediate dilution of $8.68 per share
to new investors purchasing shares of Common Stock in this offering, as
illustrated in the following table:
 
<TABLE>
    <S>                                                                    <C>      <C>
    Assumed initial public offering price per share......................           $12.00
      Pro forma net tangible book value per share at September 30,
         1996............................................................  $ 1.80
      Increase per share attributable to investors in the offering.......    1.52
                                                                            -----
    Pro forma net tangible book value per share after the offering.......             3.32
                                                                                    ------
    Dilution per share to new investors..................................           $ 8.68
                                                                                    ======
</TABLE>
 
     The following table summarizes, on a pro forma basis as of September 30,
1996, the number of shares of Common Stock purchased from the Company, the total
consideration paid, and the average price per share by existing stockholders and
by purchasers of shares offered by the Company hereby, based upon an assumed
initial public offering price of $12.00 per share (before deducting the
estimated underwriting discounts and commissions and offering expenses):
 
<TABLE>
<CAPTION>
                                          SHARES PURCHASED         TOTAL CONSIDERATION
                                       ----------------------    -----------------------    AVERAGE PRICE
                                         NUMBER       PERCENT      AMOUNT        PERCENT      PER SHARE
                                       ----------     -------    -----------     -------    -------------
<S>                                    <C>            <C>        <C>             <C>        <C>
Existing stockholders................   9,881,162       83.2%    $22,956,884       48.9%       $  2.32
New investors........................   2,000,000       16.8      24,000,000       51.1          12.00
                                       ----------     ------      ----------     ------
  Total..............................  11,881,162      100.0%    $46,956,884      100.0%
                                       ==========     ======      ==========     ======
</TABLE>
 
     The foregoing calculations assume no exercise of outstanding options. As of
November 30, 1996, there were outstanding options to purchase an aggregate of
1,180,204 shares of Common Stock at a weighted average exercise price of $3.24
per share. To the extent such options are exercised, there will be further
dilution to investors in this offering. See "Management -- Executive
Compensation" and Note 7 of Notes to Financial Statements.
 
                                       17
<PAGE>   21
 
                            SELECTED FINANCIAL DATA
 
     The selected financial data set forth below with respect to the Company's
statement of income data for each of the three years in the period ended
December 31, 1995 and the nine months ended September 30, 1996 and the balance
sheet data at December 31, 1994 and 1995 and September 30, 1996 are derived from
the financial statements audited by Ernst & Young LLP, independent auditors,
which are included elsewhere in this Prospectus and are qualified by reference
to such financial statements. The selected financial data with respect to the
statement of income data for the two years ended December 31, 1992 and the
balance sheet data at December 31, 1991, 1992 and 1993 are derived from the
financial statements audited by Ernst & Young LLP which are not included in this
Prospectus. The selected financial data with respect to the statement of income
for the nine months ended September 30, 1995 are derived from unaudited
financial statements included elsewhere in this Prospectus. The unaudited
financial statements include all adjustments, consisting only of normal
recurring adjustments, that the Company considers necessary for a fair
presentation of the financial position and results of operations for these
periods. Operating results for the nine months ended September 30, 1996 are not
necessarily indicative of the results that may be expected for the entire year
ending December 31, 1996. The data set forth below should be read in conjunction
with "Management's Discussion and Analysis of Financial Condition and Results of
Operations" and the Company's financial statements and notes thereto included
elsewhere in this Prospectus.
 
                             SUMMARY FINANCIAL DATA
                     (IN THOUSANDS, EXCEPT PER SHARE DATA)
 
<TABLE>
<CAPTION>
                                                                                                                 NINE MONTHS
                                                                  YEARS ENDED DECEMBER 31,                   ENDED SEPTEMBER 30,
                                                      -------------------------------------------------     ---------------------
                                                       1991      1992      1993       1994       1995         1995         1996
                                                      -------   -------   -------   --------   --------     --------     --------
<S>                                                   <C>       <C>       <C>       <C>        <C>          <C>          <C>
STATEMENT OF INCOME DATA:
Net sales...........................................  $    --   $ 2,920   $ 9,866   $ 16,320   $ 25,147     $ 18,236     $ 20,225
Cost of sales.......................................       --     1,612     3,268      4,416      5,649        3,781        4,318
                                                      --------  --------  --------  ---------  ---------    ---------    ---------
Gross profit........................................       --     1,308     6,598     11,904     19,498       14,455       15,907
Research and development............................    2,793     2,593     2,796      3,836      6,553        4,602        6,515
Selling, general and administrative.................    1,771     3,622     4,841      5,960      7,134        5,203        6,116
                                                      --------  --------  --------  ---------  ---------    ---------    ---------
Total operating expenses............................    4,564     6,215     7,637      9,796     13,687        9,805       12,631
Income (loss) from operations.......................   (4,564)   (4,907)   (1,039)     2,108      5,811        4,650        3,276
Interest and other income, net......................      260       630       613        649      1,647        1,253        1,441
Settlement of patent matters........................       --        --        --       (338)    (1,217)        (743)      (2,368)
                                                      --------  --------  --------  ---------  ---------    ---------    ---------
Income (loss) before benefit (provision) for income
  taxes.............................................   (4,304)   (4,277)     (426)     2,419      6,241        5,160        2,349
Benefit (provision) for income taxes................       --        --        --        (63)     1,667         (132)         264
                                                      --------  --------  --------  ---------  ---------    ---------    ---------
Net income (loss)...................................  $(4,304)  $(4,277)  $  (426)  $  2,356   $  7,908     $  5,028     $  2,613
                                                      ========  ========  ========  =========  =========    =========    =========
Net income (loss) per share.........................  $ (0.61)  $ (0.49)  $ (0.04)  $   0.22   $   0.74     $   0.47     $   0.24
                                                      ========  ========  ========  =========  =========    =========    =========
Common and common equivalent shares used in
  computing per share amounts(1)....................    7,058     8,754    10,098     10,553     10,766       10,721       10,832
</TABLE>
 
<TABLE>
<CAPTION>
                                                                                    DECEMBER 31,
                                                                   ----------------------------------------------   SEPTEMBER 30,
                                                                    1991     1992      1993      1994      1995         1996
                                                                   ------   -------   -------   -------   -------   -------------
<S>                                                                <C>      <C>       <C>       <C>       <C>       <C>
BALANCE SHEET DATA:
Cash, cash equivalents and marketable securities.................  $4,869   $ 6,435   $ 5,129   $ 5,916   $13,979      $10,169
Working capital..................................................   4,746     7,049     6,407     7,974    14,428       13,967
Total assets.....................................................   6,725    10,287    10,269    14,364    27,935       28,968
Long-term obligations............................................     237       668       634       772     2,739        3,234
Stockholders' equity.............................................   5,887     8,573     8,155    10,512    18,526       21,181
</TABLE>
 
- ---------------
 
(1) Computed on the basis described in Note 1 of Notes to Financial Statements.
 
                                       18
<PAGE>   22
 
                      MANAGEMENT'S DISCUSSION AND ANALYSIS
                OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS
 
     The discussion in this Prospectus contains forward-looking statements that
involve risks and uncertainties. The Company's actual results could differ
materially from those discussed here. Factors that could cause or contribute to
such differences include, but are not limited to, those discussed in the
sections entitled "Risk Factors" and "Business," as well as those discussed
elsewhere in this Prospectus.
 
OVERVIEW
 
     Since the Company's inception in 1988, the Company has been primarily
involved in the research, development, manufacturing and marketing of
point-of-care diagnostic tests. The Company began commercial sales of Triage DOA
in February 1992 and currently markets the product worldwide primarily through
distributors supported by a small direct sales force. The Company is engaged in
research and development of additional point-of-care diagnostic products in the
microbiology, cardiology and therapeutic drug monitoring fields. See "Business."
 
     Funding for operations was provided primarily from equity financings from
the Company's inception through launch of Triage DOA in 1992. Additional funding
has come from corporate partners in the form of debt and equity financing,
license fees and other corporate funding. The Company has a limited history of
operations and first achieved profitability in fiscal 1994. All of the Company's
sales to date have been due to sales of the Triage DOA product line.
 
     Triage DOA is currently marketed pursuant to exclusive distribution
agreements in the U.S. medical market by CMS (which accounted for 80% of product
sales in the first nine months of 1996) and in certain countries in Europe,
Latin America, the Middle East and Africa by Merck. The CMS distribution
agreement has minimum quarterly sales milestones which, if the milestones are
not met, allows the Company to terminate the agreement, obligates CMS to pay
Biosite a penalty and allows the Company to appoint a new distributor or to sell
Triage DOA directly in the U.S. medical market. If the Company chooses to
terminate the CMS distribution agreement, the Company may appoint a new
distributor or it may have to invest in additional sales and marketing resources
including additional field sales personnel which could significantly increase
future sales and marketing expenses and may adversely affect sales of Triage
DOA.
 
     Since the launch of Triage DOA in fiscal 1992, the Company has experienced
significant revenue growth primarily as a result of greater demand and more
recently, the introduction of Triage Plus TCA Panel for Drugs of Abuse ("Triage
DOA Plus TCA"). In order to support increased levels of sales in the future and
to augment its long-term competitive position, the Company anticipates that it
will be required to make significant additional expenditures in manufacturing,
research and development, sales and marketing and administration, both in
absolute dollars and as a percentage of sales. In addition, the Company
anticipates higher administrative expenses resulting from its obligations as a
public reporting company upon completion of this offering.
 
     The Company anticipates that its results of operations may fluctuate for
the foreseeable future due to several factors, including whether and when new
products are successfully developed and introduced by the Company, market
acceptance of current or new products, regulatory delays, product recalls,
manufacturing delays, shipment problems, seasonal customer demand, the timing of
significant orders, changes in reimbursement policies, competitive pressures on
average selling prices, changes in the mix of products sold and patent
conflicts. Operating results would also be adversely affected by a downturn in
the market for the Company's current and future products, if any, order
cancelations or order rescheduling. Because the Company is continuing to
increase its operating expenses for personnel and new product development, the
Company's operating results would be adversely affected if its sales did not
correspondingly increase or if its product development efforts are unsuccessful
or are subject to delays. The Company's limited operating history makes accurate
prediction of future operating results difficult or impossible. Although the
Company has experienced growth in recent years, there can be no assurance that,
in the future, the Company will sustain revenue growth or remain profitable on a
quarterly or annual basis or that its growth will be consistent with predictions
made by securities analysts.
 
                                       19
<PAGE>   23
 
     The Company currently manufactures and ships product shortly after receipt
of orders and anticipates that it will do so in the future. Accordingly, the
Company has not developed a significant backlog and does not anticipate it will
develop a material backlog in the future.
 
RESULTS OF OPERATIONS
 
     The following table sets forth certain operating data as a percentage of
net sales:
 
<TABLE>
<CAPTION>
                                                                            NINE MONTHS ENDED
                                          YEAR ENDED DECEMBER 31,             SEPTEMBER 30,
                                         --------------------------       ----------------------
                                         1993       1994       1995          1995           1996
                                         ----       ----       ----       -----------       ----
<S>                                      <C>        <C>        <C>        <C>               <C>
Net sales..............................   100%       100%       100%           100%          100%
Cost of sales..........................    33         27         22             21            21
                                         ----       ----       ----           ----          ----
Gross profit...........................    67         73         78             79            79
Operating expenses:
Research and development...............    28         24         26             25            32
Selling, general and administrative....    49         37         29             29            30
                                         ----       ----       ----           ----          ----
Total operating expenses...............    77         61         55             54            62
Income (loss) from operations..........   (10)        12         23             25            17
Other income, net......................     6          4          7              7             7
Settlement of patent matters...........    --         (2)        (5)            (4)          (12)
                                         ----       ----       ----           ----          ----
Income (loss) before benefit
  (provision) for income taxes.........    (4)        14         25             28            12
Benefit (provision) for income taxes...    --         --          7             --             1
                                         ----       ----       ----           ----          ----
Net income (loss)......................   (4%)       14%        32%            28%           13%
                                         ====       ====       ====           ====          ====
</TABLE>
 
Nine months ended September 30, 1996 and 1995
 
     Revenues.  Revenues increased 11% to $20.2 million in the first nine months
of 1996 from $18.2 million in the first nine months of 1995. The increase was
primarily attributable to the Company's expansion of its Triage DOA product line
to include Triage DOA Plus TCA, which was launched in February 1995, and
continued growth of the Company's overall market share of abused drug testing
worldwide.
 
     Gross Profit.  Gross profit increased 10% to $15.9 million in the first
nine months of 1996 as a result of increased sales of the Triage DOA product
line. Gross margin was constant at 79% in the first nine months of 1996 and
1995.
 
     Research and Development Expenses.  Research and development expenses
increased 42% to $6.5 million in the first nine months of 1996 from $4.6 million
in the first nine months of 1995. This increase resulted from the expansion of
the Company's research and development and manufacturing scale-up efforts on its
microbiology, cardiac and therapeutic drug monitoring assays under development.
The Company expects its research and development expenses to increase
significantly in 1996 and 1997, reflecting increased expenditures primarily
related to hiring additional personnel.
 
     Selling, General and Administrative Expenses.  Selling, general and
administrative expenses increased 18% to $6.1 million in the first nine months
of 1996. This increase was a result of the cost of expanding the Company's
direct sales force and in-house marketing and administrative functions to
support the Company's expanded operations. The Company expects selling, general
and administrative costs to increase in absolute dollars as the Company's level
of sales and manufacturing operations increase and as the Company increases its
finance and administrative expenditures to meet its obligations as a public
reporting entity.
 
     Other Income.  Contract revenues from a related party increased $469,000 in
the first nine months of 1996 as compared to the first nine months of 1995. This
increase was primarily due to higher expenditures relating to the Triage Cardiac
development program with Merck which resulted in higher revenues to the
 
                                       20
<PAGE>   24
 
Company. Contract revenues from an unrelated party decreased $300,000 in the
first nine months of 1996. The decrease was attributable to the timing of the
achievement of milestones under the Company's development agreement with KDK.
 
     Settlement of Patent Matters.  In September 1996, the Company reached a
settlement with Abbott Laboratories, with respect to all claims set forth in a
lawsuit filed by Abbott Laboratories in May 1994. The lawsuit alleged that
Triage DOA infringed a patent licensed to Abbott Laboratories. The Company
vigorously defended the lawsuit. However, to avoid protracted litigation, the
Company settled the patent matter in September 1996, paid $2.0 million as a
settlement of the litigation and, for an additional $3.5 million and the
agreement to pay certain royalties, obtained a license to certain technology.
Future amortization of the license will be charged to cost of sales over the
life of the license. The $2.0 million litigation settlement payment, as well as
the amortization related to prior fiscal years and related legal defense costs
were charged to Settlement of Patent Matters in the nine months ended September
30, 1996. Settlement of Patent Matters expenses for the first nine months of
1995 consisted solely of legal expenses associated with the defense of the
patent litigation.
 
     Benefit (Provision) for Income Taxes.  The Company's benefit for income
taxes increased to $264,000 for the nine months ended September 30, 1996 from a
provision for income taxes of $132,000 for the nine months ended September 30,
1995. The increase in the benefit for income taxes resulted primarily from a
reduction in the valuation allowance for deferred taxes of $1.1 million in the
nine months ended September 30, 1996, as the realization of such assets became
probable.
 
Years ended December 31, 1995 and 1994
 
     Revenues.  Revenues increased 54% to $25.1 million for the year ended
December 31, 1995 from $16.3 million in 1994. The increase was primarily
attributable to the Company's commercialization of Triage DOA Plus TCA which was
launched in February 1995, and continued acceptance and expansion of Triage DOA.
 
     Gross Profit.  Gross profit increased $7.6 million to $19.5 million for the
year ended December 31, 1995 as a result of increased sales of the Triage DOA
product line. Gross margin increased to 78% for the year ended December 31, 1995
from 73% in 1994. The Company increased its manufacturing efficiency during 1995
and, with increased manufacturing volumes, covered its fixed overhead expenses
more efficiently. The Company included in cost of sales $405,000 in license
amortization for 1995 relating to the technology license agreement signed in
March 1996.
 
     Research and Development Expenses.  Research and development expenses
increased 71% to $6.6 million for the year ended December 31, 1995 from $3.8
million in 1994. This increase resulted from the expansion of the Company's
research and development and manufacturing scale-up efforts on the microbiology,
cardiac and therapeutic drug monitoring assays.
 
     Selling, General and Administrative Expenses.  Selling, general and
administrative expenses increased 20% to $7.1 million for the year ended
December 31, 1995 from $6.0 million in 1994. During the year ended December 31,
1995, the Company expanded its direct sales force and its in-house marketing and
administrative functions to support the Company's higher level of operations as
compared to 1994.
 
     Other Income.  Contract revenues from related parties increased $217,000 as
a result of progress in the development of Triage Cardiac. Contract revenues
from unrelated parties increased by $300,000 for the year ended December 31,
1995 from 1994. The increase was attributable to the timing of the achievement
of milestones under the Company's development agreement with KDK which was
signed in February 1995. Interest income increased $366,000 as a result of
income received on increased cash balances in 1995.
 
     Settlement of Patent Matters.  Settlement of patent matters expenses
increased primarily due to increased legal defense costs related to the patent
litigation described above. Additionally, in December 1995, the Company accrued
a one-time payment of $2.2 million for a worldwide license to technology related
to the Triage Panel products. Amortization of this license payment related to
fiscal years prior to 1995 of $440,000 was charged to settlement of patent
matters in 1995.
 
                                       21
<PAGE>   25
 
     Benefit (Provision) for Income Taxes.  The Company's benefit for income
taxes increased to $1.7 million for the year ended December 31, 1995 from a
provision for income taxes of $63,000 in 1994. The increase in the benefit for
income taxes resulted primarily from a reduction in the valuation allowance for
deferred tax assets in 1995 of $1.8 million. The Company utilized $2.2 million
in net operating loss carryforwards in fiscal 1995. As of December 31, 1995, the
Company had net operating loss carryforwards of approximately $3.1 million for
federal income tax purposes. The Company's ability to utilize its net operating
loss carryforwards and tax credit carryforwards in future years will be subject
to an annual limitation pursuant to the "change in ownership rules" under
Section 382 of the Internal Revenue Code of 1986, as amended. However, any
annual limitation is not expected to have a material adverse effect on the
Company's ability to utilize its net operating loss and tax credit
carryforwards.
 
Years ended December 31, 1994 and 1993
 
     Revenues.  Revenues increased 65% to $16.3 million for the year ended
December 31, 1994 from $9.9 million in 1993. The increase was primarily
attributable to the continued acceptance of the Company's Triage DOA product
line.
 
     Gross Profit.  Gross profit increased $5.3 million to $11.9 million for the
year ended December 31, 1994 from gross profit levels for the year ended
December 31, 1993 as a result of increased sales of Triage DOA. Gross margin
increased to 73% for the year ended December 31, 1994 from 67% in 1993. The
Company increased its manufacturing efficiency during 1994 and, with increased
manufacturing volumes, covered its fixed overhead expenses more efficiently.
 
     Research and Development Expenses.  Research and development expenses
increased 37% to $3.8 million for the year ended December 31, 1994 from $2.8
million in 1993. This increase resulted from the expansion of the Company's
research and development and manufacturing scale-up efforts on Triage DOA Plus
TCA and research and development on Triage Cardiac.
 
     Selling, General and Administrative Expenses.  Selling, general and
administrative expenses increased 23% to $6.0 million for the year ended
December 31, 1994 from $4.8 million in 1993. During the year ended December 31,
1994, the Company's expanded the direct sales force and the in-house marketing
and administrative functions to support the Company's higher level of operations
as compared to 1993.
 
     Other Income.  Contract revenues from related parties increased $344,000 in
1994 as compared to such revenues in 1993 as a result of entering into a
collaborative agreement in June 1994 with Merck, which is sharing in the
development expenses of Triage Cardiac. Decreases in licensing fee income in
1994 as compared to such income in 1993 resulted from the completion of a
license agreement with a third party during 1994.
 
     Settlement of Patent Matters.  Settlement of patent matters expense in 1994
consisted solely of legal defense costs related to the patent litigation
described above.
 
     Benefit (Provision) for Income Taxes.  The Company utilized $3.2 million in
net operating loss carryforwards in fiscal 1994 which reduced the provision for
income taxes to $63,000.
 
LIQUIDITY AND CAPITAL RESOURCES
 
     The Company has historically financed its operations through private
placements of equity securities, revenues from operations, debt and capital
lease financing and interest income earned on the net proceeds from the private
placements. Since its inception, the Company has raised over $21.7 million in
net cash proceeds from the private placement of equity securities and $1.0
million from the issuance of convertible debentures.
 
     During the nine months ended September 30, 1996, the Company generated $1.1
million in cash from operating activities. Cash generated from sales were offset
primarily by the payments totaling $6.2 million for
 
                                       22
<PAGE>   26
 
licenses to certain technologies. In addition, the Company paid $2.0 million to
settle patent litigation with Abbott Laboratories. During 1995 and 1994, the
Company generated $7.9 million and $1.9 million of cash from operating
activities, respectively. The Company financed through promissory notes and
capital leases $2.3 million and $900,000 in equipment purchases in 1995 and
1994, respectively. At September 30, 1996, the Company had cash and cash
equivalents totaling $1.4 million, marketable securities of $8.8 million and
working capital of $14.0 million.
 
     The Company believes that its available cash, cash from operations and
funds from existing credit arrangements, together with the proceeds of this
offering, will be sufficient to satisfy its funding needs for at least the next
24 months.
 
                                       23
<PAGE>   27
 
                                    BUSINESS
 
BACKGROUND
 
     Biosite develops, manufactures and markets rapid, accurate and
cost-effective diagnostic products that improve the quality of patient care and
simplify the practice of laboratory medicine. The Company believes that its
Immediate Response Diagnostics can have an important impact on medical
decisions, patient care and the cost of medical treatment. The Company's first
product, Triage DOA, a small self-contained test capable of detecting a broad
spectrum of commonly overdosed prescription and illicit drugs in approximately
10 minutes, is used by over 2,600 hospitals and emergency departments. Since its
introduction in 1992, over 4.2 million Triage DOA panels have been sold
worldwide for use in hospital emergency department screening and workplace
testing. The Company is developing several additional products for applications
where the Company believes its Immediate Response Diagnostics can play an
important role in improving patient care. Products under development include
tests that are intended to aid in the diagnosis of heart attacks, the dosing of
certain therapeutic drugs, the management of certain chronic diseases and the
detection of certain bacterial and parasitic infections.
 
     The Company has two product platforms that are designed to provide rapid
results through either qualitative visual readings or quantitative meter
readings. These platforms are based upon the Company's proprietary technologies
in the areas of reagent development, signaling chemistry and micro capillary
fluidics. The Company's testing formats are designed to measure single or
multiple analyte targets simultaneously, and to allow for the analysis of
various sample sources, including urine, serum, plasma, whole blood and stool.
The Company has entered into strategic arrangements with major pharmaceutical
and diagnostic companies, including Sandoz for the development of a product to
monitor the concentrations of the immunosuppressant drug, cyclosporine; Merck
and KDK for the development of a cardiac marker product used in the diagnosis of
heart attacks; and LRE for the development of a fluorescent meter. In addition,
the Company uses CMS to distribute Triage DOA to hospital-based laboratories and
emergency departments in the United States and Merck to distribute Triage DOA in
certain countries in Europe, Latin America, the Middle East and Africa.
 
INDUSTRY OVERVIEW
 
     In 1995, the worldwide market for immunoassay tests exceeded $5.1 billion,
consisting primarily of testing related to infectious disease, endocrinology,
therapeutic drug monitoring, drugs of abuse testing, immunology/allergy, tumor
markers and blood typing. The global market for immunoassay tests continues to
expand as new disease states are identified, new therapies become available, and
worldwide standards of living and access to health care improve. Such tests are
performed primarily in hospital-based laboratories and commercial laboratories,
which account for approximately 80% of all diagnostic tests performed annually.
In recent years, diagnostic tests that can be performed nearer to the point of
patient care have emerged as an important tool in disease diagnosis and
management. It has been estimated that the market for point-of-care tests,
primarily hospitals and physician office/satellite facilities, will grow at
approximately 27% annually through the year 2000.
 
     Immunoassay tests were first developed based on technology developed in the
1960s. Although early immunoassay tests offered unprecedented levels of
sensitivity for the detection of low concentration analytes, they suffered from
relatively short shelf-lives, long reaction times, a need for radioactive labels
to detect completed reactions and lack of consistent results among products from
different suppliers. Over time, technological advancements such as the
introduction of monoclonal antibodies, enzyme and fluorescent labels and various
solid phase mechanisms shortened immunoassay test reaction times, provided
higher specificity and allowed development of tests with longer shelf-lives and
greater consistency.
 
     Such advancements also led to the development of immunoassay analyzers,
testing systems utilizing automated liquid handling mechanisms and
reagent-adding pipetting systems. Modern immunoassay analyzers are capable of
storing and selecting multiple reagents for a variety of analytes, including
drugs, hormones and cancer antigens. They also provide accurate and highly
sensitive test results and help to simplify the performance of antibody-based
tests. However, immunoassay analyzers are large and complex, have lengthy
 
                                       24
<PAGE>   28
 
turnaround times and require high volumes of sample throughput to justify the
investment in equipment, training, staffing and the costs required to operate
and support the system.
 
     In recent years, there has been a continuing shift from the use of such
conventional analyzer systems to more technologically advanced point-of-care
tests that can be performed in minutes by less highly trained personnel. Simple,
rapid immunoassay tests are capable of detecting a single analyte target with a
color change that can be visually interpreted. Formats such as dipsticks, test
tubes and wicking membrane test cartridges have been used to provide fast
non-instrument read results for conditions where a single analyte target is
present in high concentrations and where a simple yes/no non-numeric answer is
clinically relevant. Rapid color change test formats are widely available for
pregnancy, strep throat and ovulation prediction. Until recently, simple test
formats have remained incapable of precise, multi-analyte detection or highly
sensitive, quantitative measurements. As a result, medical conditions where the
detection of one or more analytes is required or where the precise quantitation
of the target analyte is required have remained the domain of immunoassay
analyzers.
 
     The Company believes that there is significant market potential for
advanced point-of-care diagnostic products. Point-of-care testing helps to
reduce overall health care delivery costs and can improve patient outcomes by
providing diagnosis during the patient visit, thereby minimizing the time to
medical intervention and reducing the need for additional patient follow-up.
Patients undergoing emergency procedures can benefit from more timely and
accurate testing results, both to ensure correct decision making and to avoid
unnecessary use of costly inpatient care. Disease management programs such as
therapeutic drug monitoring programs can benefit from real-time, point-of-care
evaluations that enable care-givers to optimize drug dosing. Quicker diagnosis
of infectious agents can also permit earlier prescription of appropriate
medications, shortening the duration of illness.
 
TECHNOLOGY
 
     Biosite's Immediate Response Diagnostics technology is based on several
proprietary advances in the biological and physical sciences that make practical
the development and manufacture of rapid, accurate and cost-effective
point-of-care diagnostics. The Company's products integrate its expertise in
several core scientific and engineering disciplines, including antibody
development and engineering, analyte cloning and synthesis, signaling chemistry
and micro capillary fluidics, each of which is described below. Biosite's
research and development program is supported by 60 full time professionals,
including 15 Ph.D.s with expertise in the Company's core technologies. By
combining research capabilities in each of these areas, Biosite is able to
create novel single and multi-analyte diagnostics which overcome the limitations
of traditional rapid diagnostic technologies and seek to address the significant
unmet need for effective point-of-care diagnostic information.
 
  Antibody Development and Engineering
 
     Biosite believes that its internal antibody development and engineering
capabilities allow rapid identification and development of antibodies with
optimal specificity, affinity and stability characteristics. The Company
initially utilized hybridoma technology for the selection and production of its
novel antibodies. Two disadvantages of hybridoma technology are the length of
time required to develop antibody candidates and the need to restart the
antibody development process when unwanted characteristics such as cross
reactivities are discovered. The Company has developed a proprietary process
that enables the selection and production of antibodies more rapidly and
efficiently than is possible using hybridoma technology. In addition, Biosite
has isolated the genes encoding the antibodies that permit the genetic
engineering of antibodies. As a result, Biosite can alter or add specific amino
acids or polypeptides in an antibody in order to improve the antibody's
specificity and to facilitate purification of the antibody. This technology
accelerates the antibody selection process by rapidly eliminating unwanted cross
reactivities discovered in product development.
 
  Analyte Cloning and Synthesis
 
     The Company has molecular biology capabilities that include the cloning and
identification of specific proteins useful in the development of immunoassays.
Biosite has developed proprietary expression vectors that
 
                                       25
<PAGE>   29
 
enable the production and purification of these proteins for the development of
antibodies and for use as calibrators and controls in its immunoassay products.
In addition, the Company has considerable expertise in synthetic organic
chemistry which allows the synthesis of targets and useful derivatives. The
Company develops products for which the targeted analyte can be small (i.e.,
haptens, such as drugs) or large (i.e., proteins, such as cardiac enzymes). The
Company believes that the ability to develop, stabilize and manufacture the
target analyte or its analogues is key to the development of highly accurate
immunoassays.
 
  Color/Photochemical Signaling
 
     Immunoassays require the attachment of a detectable label to an antibody or
target analyte. The Company has developed a variety of labels for the
development of its products. For yes/no tests, a visual label that produces
color is attached to antibodies or analytes through either non-covalent or
covalent chemical methods. For its quantitative products, the Company has
developed novel fluorescent dyes which are attached to antibodies or analytes
using both noncovalent and covalent chemical means. Although fluorescence is a
potentially powerful label for use in immunoassays, its potential has been
limited by the lack of available dyes that are stable and have no sample
interference, and the requirement of a complex instrument for detection. The
Company's novel fluorescent dyes are stable and exhibit properties that permit
their use in complex biological samples such as serum, plasma and whole blood
without interference from the sample. Furthermore, these novel dyes absorb light
at wavelengths where a simple instrument can be used to excite and detect
fluorescence for quantitative measurements.
 
  Micro Capillary Test Device Technology
 
     Biosite has developed proprietary technology to design, develop and
manufacture devices containing micro capillaries to control the flow of fluids
in immunoassay processes. The qualitative device format uses micro capillaries
to draw fluids through a membrane that contains immobilized antibody zones for
the detection of specific substances. The quantitative device format uses
several different micro capillary designs to control the contact of sample with
reagents and to control the flow of fluid throughout the device. When sample is
added to the quantitative device, a filter contained within the device separates
blood cells from plasma which is further directed by capillary forces into a
chamber that contains dried immunoassay reagents. After an incubation time that
is determined by another micro capillary element of the device, the volume of
sample that contacted the reagents flows down a capillary path that brings it
into contact with immobilized antibody zones. The binding of fluorescent
reagents at these zones is detected by an instrument and is related to the
concentration of the substance being tested for in the sample. The Company has
also developed the engineering capability to design unique micro capillary
structures in plastic parts and to fabricate them in commercial scale quantities
using injection molding processes.
 
  Sample Handling
 
     The Company has developed proprietary technology relating to sample
handling and preparation, including technology that allows whole blood to be
passively separated into its plasma component or to be passively lysed to
release the target analyte. The Company has also developed technologies for the
handling of stool samples which concentrate and purify the target analytes or
organisms from solid stool materials. In addition, the Triage Panel platform
test formats can be used to assay urine samples.
 
PRODUCT PLATFORMS
 
     The Company has used its core technologies to develop two product
platforms: the Triage Panel and the Triage CareLink System. Both of the
Company's product platforms utilize the Company's expertise in antibody
engineering, analyte cloning, signaling chemistry, micro capillary fluidics and
sample handling technologies.
 
                                       26
<PAGE>   30
 
  Triage Panel
 
     The Triage Panel platform is designed for rapid, qualitative screening of
multiple analytes in a small single-use hand-held device. The Triage Panel has a
visual (yes/no) display containing simultaneous tests for up to eight analytes
and two control standards, can be performed in a simple multi-step process, and
is capable of performing tests on both urine and stool. Triage DOA, the first
product developed on this platform, tests for up to eight drugs of abuse in
approximately 10 minutes. Triage Panel products under development include tests
for the detection of microorganisms which cause severe gastrointestinal disease.
 
  Triage CareLink System
 
     The Triage CareLink System platform is designed to provide rapid
quantitative results for immunoassay tests of whole blood, serum and plasma. The
Triage CareLink System consists of two parts: a small single-use disposable test
cartridge and a proprietary hand-held point-of-care fluorescent meter. After
blood is applied to the cartridge, the cartridge is inserted into the meter,
which is designed to automatically detect up to six analytes simultaneously and
display the results on a numerical electronic read-out. The meter incorporates
proprietary software in erasable programmable read-only memory ("EPROM") chips
which are intended to be plugged into each meter to perform multiple types of
tests and automatically determine which test is being run. In addition, the
EPROM chips are designed to automatically calibrate the meter on a lot specific
basis. The software may also provide important information regarding the analyte
measured, such as normal or abnormal levels of a marker which could then be used
to initiate therapy or manage patient disease. The Company believes that the
analyte measuring sensitivity of the Triage CareLink System products under
development will match or exceed the sensitivity levels of the conventional
immunoassay analyzers. The Company is currently developing two applications for
this platform, Triage Cardiac, a device for the quantification of three cardiac
markers associated with AMI, and Triage Transplant, a product for the monitoring
of the concentration of cyclosporine, an immunosuppressant drug prescribed for
organ transplant recipients to prevent transplant rejection.
 
PRODUCT ATTRIBUTES
 
     Although the current products and products under development are based upon
the Triage Panel and Triage CareLink System platforms and utilize different
technologies, they share common attributes which the Company believes make them
superior to conventional immunoassay analyzers:
 
     - RAPID RESULTS:  Triage DOA and the Company's products under development
       are designed to offer complete results in a STAT timeframe, and to have
       room temperature stability, making them immediately available for use.
 
     - EASE OF USE:  Triage DOA and the Company's products under development are
       designed to be simple to use. Triage DOA has only three steps while
       Triage Cardiac and Triage Transplant are expected to require only one
       step.
 
     - HIGH ANALYTICAL ACCURACY:  The Company develops and uses high quality
       biological and chemical reagents to yield highly specific, accurate and
       reproducible analytical results.
 
     - CAPABILITY OF PERFORMING MULTIPLE ANALYSES:  Triage DOA and the Company's
       products under development are designed to measure one or more target
       analytes simultaneously, including reagent controls, without sacrificing
       the quality of the individual analysis. This simultaneous detection
       capability can provide significant time and cost savings compared to
       current technologies.
 
     - RELIABILITY:  Biosite's use of internal thresholds, built-in controls,
       lockouts and other controlling mechanisms are intended to make its
       current and future products extremely reliable in any hospital or
       clinical laboratory setting.
 
     - COST EFFECTIVENESS:  Triage DOA and the Company's products under
       development are designed to eliminate the need for highly trained
       technicians and significant outlays for testing equipment acquisition and
       maintenance, making them cost-effective alternatives to conventional
       immunoassay analyzers.
 
                                       27
<PAGE>   31
 
PRODUCTS AND PRODUCTS UNDER DEVELOPMENT
 
     Triage DOA was introduced in 1992 and has been used by hospital emergency
departments to screen for up to eight commonly abused prescription and illicit
drugs or drug classes. The Company is developing five additional products which
apply the Company's Immediate Response Diagnostics technologies to a variety of
other medical testing needs. Triage DOA and the Company's five products under
development are described in the table below. The table also indicates the
Company's corporate partners with respect to Triage DOA and products under
development. The Company intends, where appropriate, to enter into additional
collaborative arrangements to develop and commercialize future products. There
can be no assurance that the Company will be able to negotiate collaborative
arrangements on favorable terms, if at all, in the future, or that its current
or future collaborative arrangements will be successful.
 
        T
        R
        I
        A
        G
        E
 
        P
        A
        N
        E
        L
        S
 
      T
      R
      I
      A
      G
      E
 
<TABLE>
<S>       <C>                      <C>                  <C>                      <C>                  <C>
- ---------------------------------------------------------------------------------------------------------------------
- ---------------------------------------------------------------------------------------------------------------------
                                                                                 STATUS/EXPECTED
                                                                                 U.S. REGULATORY      CORPORATE
           PRODUCTS                APPLICATION          ANALYTE TARGETS          PATHWAY(1)           PARTNER(2)
           ----------------------------------------------------------------------------------------------------------
           Triage Panel            Drug Screening       Phencyclidine            On the Market/       Merck, CMS
           for Drugs of                                 Benzodiazepines          510(k) cleared
           Abuse                                        Cocaine
           (Triage DOA)                                 Amphetamine
                                                        Tetrahydrocannabinol
                                                        Opiates
                                                        Barbiturates
                                                        Tricyclic
                                                        antidepressants
                                                        Methadone
           ----------------------------------------------------------------------------------------------------------
           Triage Panel            Parasite             Giardia lamblia          In Development/      --
           for Parasitology        Screening            Entamoeba                510(k)
           (Triage O&P)                                   histolytica
                                                        Cryptosporidium
                                                        parvum
           ----------------------------------------------------------------------------------------------------------
           Triage Panel for        Pathogen             C. difficile Antigen     In Development/      --
           Clostridium             Detection            C. difficile Toxin A     510(k)
           difficile
           (Triage C. diff)
           ----------------------------------------------------------------------------------------------------------
           Triage Panel            Pathogen             Salmonella               In Development/      --
           for Enteric             Screening            Shigella                 510(k)
           Pathogens                                    Campylobacter
           (Triage Enteric)                               jejuni/coli
- ---------------------------------------------------------------------------------------------------------------------
           Triage                  Acute                CK-MB                    In Development/      Merck(3),
           Cardiac                 Myocardial           Troponin I               510(k)               KDK, LRE
                                   Infarction           Myoglobin
                                   Detection
           ----------------------------------------------------------------------------------------------------------
           Triage                  Drug Monitoring      Cyclosporine             In Development/      Sandoz,
           Transplant                                                            PMA                  LRE
- ---------------------------------------------------------------------------------------------------------------------
- ---------------------------------------------------------------------------------------------------------------------
</TABLE>
 
(1) The FDA regulatory approval process requires many steps before a product can
    be approved for marketing. The terms "510(k)" and "PMA" indicate the
    regulatory approval pathway the Company believes will be applicable to a
    product, although there can be no assurance that the FDA will agree that the
    pathway noted is the appropriate pathway for the specific product. See "Risk
    Factors -- Government Regulation." For a description of the terms 510(k) and
    PMA see "-- Government Regulation."
 
(2) For a description of the Company's collaboration arrangements, see
    "-- Strategic and Distribution Arrangements."
 
(3) Merck has informed the Company that Merck is considering assigning its
    rights under its agreements with the Company concerning the marketing of
    Triage Cardiac either to a third party or back to the Company.
        C S
        A Y
        R S
        E T
        L E
        I M
        N S
       KI,2
<PAGE>   32
 
  Triage Panel for Drugs of Abuse
 
     The Company believes the worldwide market for abused drug testing is
approximately $350 million annually, the majority of which is accounted for by
testing performed in the United States. The U.S. market can be divided into
three major categories:
 
     - MEDICAL TESTING:  The medical testing segment represents testing
       typically performed in a hospital laboratory. Such tests have the highest
       need for rapid turnaround of results, and generally have the highest cost
       per result. The results are generally reported to emergency physicians
       and psychiatrists.
 
     - NON-MEDICAL TESTING:  The non-medical testing market consists of testing
       performed for industry, as well as in the criminal justice setting and
       drug rehabilitation centers. Testing may be performed on-site but
       generally samples are sent to independent reference laboratories.
       Typically, the demands for a rapid result are not quite as great as in
       the medical segment. Additionally, the cost per result is slightly
       reduced.
 
     - REFERENCE LABORATORY TESTING:  The reference laboratory testing market
       accounts for a sizable portion of the total drug testing market. The
       majority of samples come from the non-medical testing market, although
       some smaller hospitals in the medical testing market also send their
       samples to reference laboratories. In general, results are not available
       for at least 24 hours from the time the specimen is collected. Despite
       relatively long turnaround times, the reference laboratory market has
       remained substantial because of its ability to produce results on a low
       cost per panel basis.
 
  Emergency Department Screening
 
     A 1988 Substance Abuse and Mental Health Services Administration ("SAMHSA")
survey concluded that over 14.5 million Americans had used an illicit drug at
least once in the prior month. Emergency physicians have indicated that drug
abuse plays a role in 5% to 10% of the emergency medicine cases occurring
annually in the United States, either as a primary cause such as an overdose, or
as a contributing factor such as in the case of an accident. A diagnostic
dilemma confronts physicians when a patient is presented with symptoms that
could either be drug related or non-drug related. A patient brought to a
hospital emergency department in a coma may be under the influence of narcotics
or sedatives, which may require one type of treatment or intervention.
Conversely, the same patient may have had a stroke or suffered some form of
trauma, requiring a completely different type of care. The ability to have a
differential diagnosis in a timely manner greatly aids the course of treatment.
 
     Prior to the introduction of Triage DOA, drug or toxicology screening was
accomplished by several technologies, primarily Gas Chromatography/Mass
Spectroscopy ("GC/MS") and automated immunoassays. Although GC/MS is the most
specific identification method commercially available, it is time consuming
(requiring an average of approximately three hours per test), complex and
expensive, and is generally reserved for final confirmation of specimens that
have been screened positive by an immunoassay. Automated immunoassay tests,
although less expensive than those performed by GC/MS, also require significant
amounts of time (approximately one to two hours) because of the necessity of
performing analyses of several drugs sequentially on each patient specimen.
Additionally, in many cases the equipment required to perform an immunoassay is
not accessible on an immediate or STAT basis.
 
     Triage DOA is a rapid qualitative urine screen that analyzes a single test
sample for up to eight different illicit and prescription drugs or drug classes
and provides results in approximately 10 minutes. Triage DOA is instrument
independent, contains built-in controls for accuracy and is capable of a high
degree of specificity. Illicit drugs tested for by Triage DOA include
Amphetamines/Methamphetamines (speed, crystal), Cocaine (crack), Opiates
(heroin), Phencyclidine (angel dust), Tetrahydrocannabinol (pot, marijuana),
while prescription drugs tested by Triage DOA include Barbiturates
(Phenobarbital), Benzodiazepines (Valium, Librium, Halcion), Tricyclic
Antidepressants (Elavil, Tofranil) and Methadone. Triage DOA can be configured
to test various combinations of the foregoing drugs. In February 1995, the
Company launched Triage DOA Plus TCA, a configuration which includes a test for
Tricyclic Antidepressants ("TCA") that otherwise requires a separate blood test.
Since its introduction in February 1992, the Company has sold over
 
                                       29
<PAGE>   33
 
4.2 million Triage DOA panels worldwide, and over 2,600 hospitals and emergency
departments in the United States are users of the product. The graphic below
summarizes Triage DOA testing process:
 
                                   [GRAPHIC]
 
     The Company distributes Triage DOA and Triage DOA Plus TCA to the U.S.
medical market through CMS. Merck is the exclusive distributor of Triage DOA and
Triage DOA Plus TCA in certain countries in Europe, Latin America, the Middle
East and Africa.
 
  Workplace Screening
 
     It is estimated that in 1996 over 33% of new hires in the U.S. workforce
will be screened for drug usage as part of pre-employment physicals. The
majority of these test samples are sent to centralized reference laboratories
that can provide both the initial immunoassay screening result and the
confirmation of presumptive positive results by an alternate method, such as
GC/MS. Testing of government and certain government regulated employees and
contractors must be performed at SAMHSA certified reference laboratories.
Employers that are not government contractors send their drug screens to their
laboratory of choice or perform on-site testing. Non-SAMHSA testing is estimated
to account for over eight million tests performed annually.
 
     The majority of employers with drug screening programs have chosen not to
implement "on-site" testing in their facilities due to costly personnel and
regulatory burdens on an employer's in-house testing laboratory. These
industrial testers, however, still have a need for rapid results since many
employment decisions hinge on an employee's ability to pass physical and other
examinations that include a test for illegal drugs. Despite this need for rapid
results, there is a 24 to 48 hour wait based on the sample transportation and
testing process used by all major reference laboratories. Additionally, it is
estimated that approximately 90% of all employee tests have negative results.
Therefore, an immunoassay test that provides rapid results, such as Triage DOA,
can get employees back to work quickly and save employers money.
 
     In January 1996, the Company established the Express Test One-Hour Drug
Screen service, a marketing program in conjunction with regional suppliers of
occupational health services, as a means of expanding the market for Triage DOA.
The Express Test program incorporates the Company's "near-site" testing strategy
of providing the benefits of rapid drug test results using Triage Intervention
(a test for five illicit drugs or drug classes) without the burdens that would
be imposed on employers setting up an on-site laboratory. Participating
occupational health clinics provide rapid results to industrial clients that
send prospective employees to them for pre-employment physicals and drug
screens. Biosite's sales force actively supports these selected occupational
health clinics in their marketing of the Express Test program to potential
 
                                       30
<PAGE>   34
 
industrial clients in their regional area. Biosite currently has six sales
professionals actively establishing select providers to be a part of the Express
Test program.
 
  Triage Cardiac
 
     In 1992, over 6.0 million people in the United States visited hospital
emergency departments exhibiting symptoms of a heart attack. Of those,
approximately 650,000 were diagnosed with AMI and approximately 800,000 were
diagnosed with unstable angina. In total, approximately 1.9 million of the
patients who presented with chest pain were admitted to coronary care units. Of
these, approximately 30,000 to 60,000 patients were misdiagnosed as not having
an AMI. Additionally, approximately 500,000 of these patients who had not had an
AMI were admitted to hospitals and ultimately released within two days. The
Company believes that rapid, quantitative results for multiple cardiac markers
provided at the point-of-care may have a positive impact on misdiagnosed AMI,
and may provide substantial benefits to patients and savings to the hospital.
 
     AMI is generally caused by the blocking or "occlusion" of an artery
providing oxygen-carrying blood to the heart. Without oxygen, the heart muscle
is destroyed, and a prolonged occlusion results in additional muscle damage. The
destruction of such cells in the heart muscle results in the release of several
markers into the bloodstream, including creatinine kinase ("CK-MB"), Troponin I
and Myoglobin.
 
     In general, for early diagnosis of AMI clinicians rely on
electrocardiograms and on the measurement, over time, of CK-MB. Troponin I and
Myoglobin are also emerging as adjuncts to CK-MB to improve the detection of
heart attacks. The Company believes that the concentrations of these three
markers peak and fall over different time periods and that the simultaneous
measurement of these markers is a more accurate diagnostic technique for AMI
than the measurement of any one single marker. Studies have shown that serum
concentrations of Myoglobin are elevated most quickly post-AMI, followed by
CK-MB. Additionally, serial quantitative measurement of Myoglobin has
demonstrated a significantly higher sensitivity in diagnosing AMI than CK-MB in
patients presenting within 12 hours of AMI symptom onset. Troponin I has been
shown to maintain an elevated concentration for a longer period of time than
CK-MB and Myoglobin.
 
     Several diagnostic tests have recently been developed to quantitatively
measure the blood levels of such markers. Unfortunately, the measurement of
multiple markers currently requires large, centralized immunoassay systems that
cannot directly analyze whole blood and are not always available on a STAT
basis. Additionally, these systems require multiple reagent packs, frequent
standardization and quality control. Since turnaround time for such test results
is critical, current immunoassay systems may not satisfy physician needs.
 
     The Company believes that a point-of-care test capable of quantitatively
measuring multiple markers of an AMI would have a positive impact on patient
care. Accordingly, the Company's Triage Cardiac product under development is
being designed to quantitatively measure the level of CK-MB, Troponin I and
Myoglobin in a single test device from a sample consisting of two drops of whole
blood. The hand-held Triage CareLink meter under development is being designed
to provide quantitative results of such measurements at or near the
point-of-care. Triage Cardiac may aid in the detection of AMI by providing
point-of-care quantitative results in approximately 10 minutes, providing
physicians with the ability to make treatment decisions in a timely manner.
 
     Triage Cardiac is in the late stages of development with clinical
investigations expected to begin in the first half of 1997. If successfully
developed and cleared for marketing, the Company anticipates selling Triage
Cardiac directly in the United States and through KDK in Japan. The Company
currently has an agreement with Merck regarding distribution of Triage Cardiac
in certain countries in Europe, Latin America and South Africa. However, Merck
has informed the Company that Merck is considering assigning its rights under
such agreement either to a third party or back to the Company.
 
  Triage C. diff
 
     Clostridium difficile ("C. difficile") is an opportunistic pathogen of the
intestinal tract that may thrive as a result of broad spectrum antibiotic
treatment. The bacteria may be found in asymptomatic carriers or may
 
                                       31
<PAGE>   35
 
be spread among hospital patients that are immunocompromised or receiving
antibiotics. Cytotoxins produced by the bacteria mediate C. difficile-associated
disease ("CDAD"), which may include antibiotic-associated diarrhea and
antibiotic-associated pseudo-membranous colitis. Due to the contagiousness of
CDAD, patients identified as possibly having CDAD are usually placed in
isolation until the infection is controlled. Symptoms of CDAD include diarrhea
as well as fluid and weight loss. It has been estimated that in 1995,
approximately 3.0 million rapid tests for C. difficile were performed in the
United States. This number is expected to continue to rise due to the expected
increase in the number of patients who are immunocompromised.
 
     Until recently, the use of a cytotoxic test, which takes 48 to 72 hours to
produce diagnostic results, was the only means to identify the toxin associated
with C. difficile. More recently, in response to the need for more rapid
identification of the C. difficile toxin, several manufacturers have developed
and marketed enzyme-linked immunosorbent assay ("ELISA") tests that can be
performed in one to two hours. These ELISA test formats are used by the majority
of the hospitals testing for the toxin.
 
     Although the ELISA technology has been a great improvement over the
cytotoxic test, it still requires several precisely timed steps as well as
multiple standards every time the test is performed, making it unlikely the
testing will be done whenever an individual specimen is sent to the laboratory.
The multiple standards and quality controls required with each run make the
processing of individual specimens expensive. As a result, specimens are
generally only processed in "batch" mode, delaying the time to a diagnostic
result, and the time by which a physician receiving the information can take
therapeutic measures.
 
     Triage C. diff is designed to simplify the laboratory procedure and improve
time to result to the physician by enabling laboratories to complete testing for
the bacteria and toxin in approximately 10 minutes. Because the test is being
designed with built-in controls and standards, the test may be able to be
performed individually or in batches, by any laboratory technician, without
compromising the quality of the result. Triage C. diff may thus reduce time to
initiate therapy and minimize time in isolation. Rapid, accurate diagnosis of
the bacteria and toxin should enable earlier treatment, which may reduce length
of stay in the hospital and reduce cost.
 
     Triage C. diff is in the late stages of development with clinical
investigations expected to begin in the first half of 1997. If successfully
developed and cleared for marketing, the Company expects to market this product
directly in the United States.
 
  Triage O&P
 
     Parasitic infection is a common cause of gastrointestinal disease and
diarrhea. Some of the more common parasites responsible for such infection are
Giardia lamblia ("Giardia"), Cryptosporidium parvum ("C. parvum"), Entamoeba
histolytica and Microsporidia species. According to the U.S. Centers for Disease
Control and Prevention ("CDC"), more than 900,000 people in the United States
become ill each year from waterborne parasites. Additionally, with the increase
in world travel, it is probable that the number of cases diagnosed in the United
States will rise. Further, parasites frequently infect immunocompromised
patients, especially HIV infected patients, which has lead to an increase in the
incidence of infection by Microsporidia species.
 
     The most commonly employed method of detecting parasites from stool samples
is by manual ova and parasite ("O&P") microscopic examination, typically of
three consecutive stool specimens from the patient. The preparation of the
sample by a laboratory technologist involves stool specimen dilution and the
preparation of multiple microscope slides. Each slide must then be observed via
microscope by a technologist trained in the identification of parasites. The
time to diagnose parasitic infection is prolonged due to the need for manual
microscopic examination of multiple stool specimens per patient. The prolonged
time to obtain results may delay the treatment of patients, and ultimately
increase the cost of health care for such patients.
 
     It is estimated that in 1997 over six million O&P microscopic examinations
will be performed in the United States. Because of the cumbersome procedure and
limited test menu of the current ELISA test formats, these tests have had
limited success in hospitals that perform larger volumes of tests in batches.
Recently, several manufacturers have developed and marketed ELISA tests for the
more rapid identification
 
                                       32
<PAGE>   36
 
of two of the more common parasites Giardia and C. parvum. Such tests are,
however, subject to numerous limitations, including the requirement of multiple
timed steps, two hour time to result, a need to run additional standards and
controls with patient specimen and availability of tests for two parasites only.
 
     Triage O&P is designed to replace the standard O&P microscopic detection
method for three of the most commonly encountered parasites: Giardia, C. parvum
and Entamoeba histolytica in a single test device. Future versions of Triage O&P
may include a test for Microsporidia species. Because each test device includes
standards and controls, the product may be able to be used for any volume of
tests. If successfully developed and approved for marketing, Triage O&P may make
rapid results (approximately 10 minutes) available to hospitals of any size,
including facilities that previously sent such testing to a reference lab. The
Company expects that Triage O&P will have sensitivity comparable to the current
O&P microscopic examination, but will require only a single patient specimen.
This should greatly reduce the collection burden for the patient, and reduce the
amount of labor for the laboratory technician, thereby reducing costs.
Additionally, the length of time physicians wait for results may be reduced.
 
     Triage O&P is in the late stages of preclinical development.
 
  Triage Enteric
 
     Gastroenteritis, commonly described as "food poisoning," often occurs among
individuals who have consumed contaminated foods or been exposed to stool
contaminated with microorganisms such as Salmonella, Campylobacter jejuni/coli,
Shigella and E. coli 0157. Eight to 24 hours after such exposure, individuals
may experience abdominal pain, nausea and diarrhea. It is estimated that in the
United States over 14 million stool cultures are performed annually for the
diagnosis of food poisoning. Microorganisms are often implicated in such cases.
According to the CDC, there are over six million cases of foodborne disease
annually in the United States.
 
     Stool culture, currently the primary method of diagnosing food poisoning,
involves the inoculation of multiple culture plates with stool specimen. After
24 to 48 hours, culture plates that exhibit bacterial growth are subjected to
biochemical tests that typically take an additional 24 hours. As a result of
such a prolonged testing procedure, physicians generally wait 48 to 72 hours for
test results.
 
     Triage Enteric is being developed for identification of three of the most
common enteric bacteria responsible for food poisoning, Salmonella,
Campylobacter jejuni/coli and Shigella. Future versions of Triage Enteric may
include a test for E. coli 0157. Triage Enteric would enable the laboratory
technician to rapidly detect from a stool specimen the presence of such enteric
bacteria. This should greatly reduce the amount of labor required of laboratory
technicians, thereby reducing costs. Additionally, the length of time by which
results can be returned to the physician would be improved.
 
     Triage Enteric is in the development stage.
 
  Triage Transplant
 
     Transplants of human organs generally require suppression of the immune
system of the organ recipient. Cyclosporine is the most widely used
pharmaceutical for such purposes, with annual worldwide sales in excess of $1.0
billion. Sandoz is the developer and leading supplier of cyclosporine, and is
involved in several collaborations in the organ transplant field that include
health care management, xenotransplantation, and near-patient testing in an
effort to support the use of organ transplantation. Cyclosporine is chronically
administered to patients who have received an organ transplant. Over 18,000
patients undergo organ transplantation in the United States annually. In excess
of 200,000 organ recipients worldwide take immunosuppressant drugs on a daily
basis.
 
     The blood level of cyclosporine must be monitored to ensure that a patient
receives the appropriate therapeutic dose while minimizing toxicity. Patients
receiving cyclosporine must maintain a minimum concentration of the drug for it
to be effective, yet maintain a level that is low enough not to be toxic. This
 
                                       33
<PAGE>   37
 
range is often referred to as the therapeutic window. Physicians primarily rely
on large, centralized laboratories to measure cyclosporine blood levels. The
physician typically does not receive test results for at least 24 to 48 hours,
requiring a call back to the patient if the dose of the drug needs to be
adjusted. A smaller share of cyclosporine testing is performed by high
performance liquid chromatography ("HPLC"). The current worldwide market for
cyclosporine testing by immunoassay is estimated to be over 4.0 million tests
per year. Patients are monitored frequently in the immediate post-transplant
time-frame with reduced but continued testing, an average of four times per
year, for the remainder of the patient's lifetime.
 
     Triage Transplant is designed to utilize the Triage CareLink meter to
enable a physician to easily, rapidly and accurately measure cyclosporine
levels. Triage Transplant is being developed to provide physicians with a
cost-effective means of determining cyclosporine levels at the point-of-care
which provides the physician with the ability to optimize drug therapy during
the patient's visit. As part of its research and development collaboration with
Sandoz, Biosite has obtained licenses to certain technology that makes rapid
analysis of cyclosporine levels possible. See "-- Strategic and Distribution
Arrangements."
 
     Triage Transplant is in the preclinical development stage. If successfully
developed and approved for marketing, the Company expects Sandoz to support the
promotion of Triage Transplant worldwide.
 
RESEARCH AND DEVELOPMENT
 
     As of November 30, 1996, the Company had 60 employees in research and
development, of which 15 have Ph.D.s. The Company's research and development
organization is dedicated to the discovery and development of new technologies
which can be applied to future products and the development of new products in
its existing platform technologies.
 
     The Company has research staff dedicated to the development and production
of antibodies through a variety of techniques. Recombinant techniques are used
to express proteins for use as diagnostic targets. The Company's staff of
chemists and biochemists synthesize drug targets and compounds for use as
diagnostic labels as well as seek to perfect techniques for coupling these
compounds to biological reagents such as antibodies. The Company's development
engineering staff is involved in the design and development of new diagnostic
device technologies as well as processes for their fabrication and interface
with biological and chemical reagents. The Company's product development group
completes final optimization of assays and the Company's regulatory affairs
group controls all in-house and external clinical trials of the Company's
products and prepares applications to the FDA for pre-market clearance of
approval.
 
MANUFACTURING
 
     As of November 30, 1996, the Company had 42 employees in manufacturing
involved in reagent production, device assembly, engineering, quality
assurance/quality control and materials management.
 
     Biosite maintains worldwide manufacturing rights to all current and future
products. A key strategy of the Company is to provide high quality analytical
results in an efficient manner. To this end, the Company invests in the design
and development of manufacturing systems and technologies that can produce a
high quality product using controlled, cost-effective manufacturing processes
and equipment. Triage C. diff, Triage O&P, and Triage Enteric are being
developed to utilize the same or similar processes and equipment as Triage DOA.
The Company believes that the experience it has acquired in manufacturing Triage
DOA will provide benefits in product quality and cost in manufacturing for its
products under development. The Company expects its manufacturing capacities
will allow such potential products and Triage DOA to be manufactured
concurrently in the same facility.
 
     All raw materials required to manufacture Triage DOA are obtained from
outside suppliers. All antibodies used in the manufacture of Triage DOA were
developed by Biosite and the cell lines are owned by Biosite. Production
quantities of most of the antibodies are produced by two vendors. In addition,
Biosite maintains its own in-house antibody production capability.
 
     The Company manufactures Triage DOA at its facility in San Diego,
California. The facility has received its registration as a diagnostic product
manufacturer from the FDA and from the California Department of
 
                                       34
<PAGE>   38
 
Health Services. The Company has also been licensed and certified to manufacture
products using controlled substances by the U.S. Drug Enforcement Agency. There
can be no assurance that the Company can continue to comply with all government
requirements and regulations which may lead to the suspension or revocation of
its right to manufacture. See "Risk Factors -- Government Regulation" and
"-- Government Regulation."
 
     The Company is also developing novel and sophisticated processes and
equipment for the future production of its Triage Cardiac and Triage Transplant
products. LRE will manufacture and supply the meter used in conjunction with the
Company's Triage CareLink System platform products. The Company is increasing
its manufacturing space at its San Diego facility to accommodate production of
Triage Cardiac.
 
SALES AND MARKETING
 
     As of November 30, 1996, the Company has 31 employees in various sales and
marketing functions. The Company markets its Triage DOA to hospital laboratories
and emergency departments in the United States through CMS, a laboratory
products distributor, and in certain countries in Europe, Latin America, the
Middle East and Africa through Merck. The Company anticipates it may directly
market in the United States its cardiac, microbiology and therapeutic drug
monitoring products under development. In geographic markets outside the United
States, the Company intends to establish relationships with marketing partners,
where appropriate, for these potential products. The Company believes it has the
management resources necessary to significantly expand its sales force for the
promotion of its potential products. There can be no assurance that any of the
Company's products under development will be successfully developed and approved
for marketing.
 
STRATEGIC AND DISTRIBUTION ARRANGEMENTS
 
     Biosite's strategy for the research, development, commercialization and
distribution of certain of its products entails entering into various
arrangements with corporate partners, licensors, licensees and others, and is
dependent upon the success of these parties in performing their
responsibilities. There can be no assurance that such parties will perform their
obligations as expected or that any revenue will be derived from such
arrangements.
 
  Curtin Matheson Scientific, Inc.
 
     In November 1991, the Company entered into a distribution agreement (the
"CMS Agreement") with CMS pursuant to which the Company granted to CMS an
exclusive right to distribute Triage DOA to hospitals, non-industrial
laboratories and certain other health and medical organizations within the
United States. In March 1996, the parties executed an amendment to the CMS
Agreement, setting forth certain purchase and cumulative sales targets which if
not met gives Biosite the option to terminate the CMS Agreement and further
obligates CMS to pay to Biosite a penalty if it fails to meet such purchase and
cumulative sales targets for 1996. Since the amendment of the CMS Agreement, CMS
has missed certain of these purchase and cumulative sales targets. In August
1996, Biosite agreed to forgive a portion of the penalty each year that CMS
meets additional sales milestones through 1999. There can be no assurance that
the additional targets will be met. The CMS Agreement provides for a six-month
transition period in the event of termination. If Biosite elects to terminate
the CMS Agreement, it may appoint a new distributor or expand its own sales
force to sell Triage DOA directly in the United States.
 
  Merck KGaA
 
     In July 1992, the Company entered into a distribution agreement with Merck,
pursuant to which the Company granted to Merck an exclusive right to market and
distribute Triage DOA in certain countries in Europe, Latin America, the Middle
East and Africa. In June 1994, the Company entered into two additional
agreements with Merck, a collaborative development agreement and a supply and
distribution agreement, in connection with the Company's development of Triage
Cardiac. Under the terms of such agreements, the Company and Merck agreed to
jointly develop, perform clinical testing of, and obtain regulatory approval for
Triage Cardiac. The agreement further provides that the Company is to be
responsible for the design, development and manufacturing scale-up of Triage
Cardiac and the reagents used in connection therewith, and for the clinical
trials and regulatory approval of Triage Cardiac for use in the AMI diagnosis
field in Japan and the United States. Merck is obligated to perform clinical
trials and obtain regulatory approval for the product for use in the AMI
diagnosis field in certain countries in Europe, Latin America and South Africa.
Additionally, Biosite is obligated to fund 60% and Merck is obligated to fund
the remaining 40% of the costs
 
                                       35
<PAGE>   39
 
incurred by both parties in developing, manufacturing and obtaining regulatory
approval for the product, subject to certain maximum aggregate expenditure
limitations and subject further to a reduction in Merck's funding obligations of
40% of payments which Biosite receives from KDK in connection with the
development and commercialization of Triage Cardiac in Japan. The agreements
further specify that Merck is to be the exclusive distributor of Triage Cardiac
for use in the AMI diagnosis field in certain countries in Europe, Latin America
and South Africa, while the Company is to retain distribution rights to the
product in the remainder of the world and for uses other than the diagnosis of
AMI. Merck has informed the Company that Merck is considering assigning its
rights under its agreements with the Company concerning the marketing of Triage
Cardiac either to a third party or back to the Company.
 
  LRE Relais + Elektronik GmbH
 
     In September 1994, the Company entered into an agreement with LRE (the "LRE
Agreement") for the development of a hand-held meter to be used in all Triage
CareLink System products currently under development, including Triage Cardiac
and Triage Transplant. Under the terms of the LRE Agreement, LRE is obligated to
develop and produce the fluorescent meter according to specifications provided
by Biosite. In return, the Company agreed to compensate LRE for certain
development and tooling expenses incurred in connection therewith, based upon
LRE's successful completion of certain feasibility, prototype and preproduction
milestones. In addition, the agreement specifies that LRE is to be the Company's
exclusive supplier of the Triage CareLink meter during the term of the LRE
Agreement, unless LRE is incapable of satisfying Biosite's needs or is
prohibited from producing such meters for a specific immunoassay application.
See "Risk Factors -- Dependence on Sole-Source Suppliers."
 
  ARKRAY KDK Corporation
 
     In February 1995, the Company entered into a development, supply and
distribution agreement with KDK, pursuant to which the parties agreed to
collaborate in the development and marketing of Triage Cardiac. Under the terms
of the agreement, KDK is obligated to provide certain funding of up to $2.0
million for the Company's development of Triage Cardiac, $500,000 of which has
been paid and the remainder of which is to be paid based upon the Company's
achievement of certain milestones. In exchange for this funding, the Company has
granted KDK the exclusive right to distribute Triage Cardiac in Japan and in
certain countries of Asia, the Middle East and Pacific Island countries. The
Company is responsible for costs associated with performing clinical trials on
and obtaining regulatory approval of Triage Cardiac in the United States, while
KDK is responsible for such costs in Japan and in certain countries of Asia, the
Middle East and Pacific Island countries. KDK can terminate this agreement at
any time.
 
  Sandoz Pharma Ltd.
 
     In September 1995, the Company entered into two license agreements with
Sandoz relating to the Company's development of Triage Transplant. The first
license is for cyclosporine antibodies and the second license is for certain
antibody-based assays for measuring cyclosporine levels in blood and plasma
which Sandoz has developed. Under the terms of the agreements, and upon the
Company's successful completion of certain feasibility requirements, the Company
has the right to make, have made, use and sell Triage Transplant using the
licensed Sandoz antibodies and related technologies. Upon entering into the two
licenses, the Company made certain initial payments to Sandoz and is obligated
to make payments to Sandoz based upon the achievement of certain product
development milestones, and to pay royalties on sales of products developed by
the Company using such antibodies or related technologies. In connection with
the agreement, Sandoz purchased $1.0 million of five-year 8% convertible
debentures which convert into 92,222 shares of Common Stock of the Company upon
the closing of this offering (based upon interest through January 31, 1997 and
an assumed initial public offering price of $12.00 per share). The Company is
obligated to sell to Sandoz up to $1.0 million additional five-year 8%
convertible debentures upon the attainment of certain milestones. The debentures
will be convertible, at the sole option of the Company, into shares of Biosite
Common Stock at the initial offering price.
 
                                       36
<PAGE>   40
 
PROPRIETARY TECHNOLOGY AND PATENTS
 
     The Company's ability to compete effectively will depend in part on its
ability to develop and maintain proprietary aspects of its technology, and to
operate without infringing the proprietary rights of others or to obtain rights
to such proprietary rights. Biosite has U.S. and foreign issued patents and is
currently prosecuting patent applications in the United States and with certain
foreign patent offices. There can be no assurance that any of the Company's
pending patent applications will result in the issuance of any patents or that,
if issued, any such patents will offer protection against competitors with
similar technology. There can be no assurance that any patents issued to the
Company will not be challenged, invalidated or circumvented in the future or
that the rights created thereunder will provide a competitive advantage.
 
     Litigation may be necessary to enforce any patents issued to the Company,
to protect trade secrets or know-how owned by the Company or to determine the
enforceability, scope and validity of the proprietary rights of others. In March
1996, the Company settled a potential patent infringement claim by obtaining a
license to the contested patent in return for a one-time payment of $2.2
million. In September 1996, the Company settled a patent infringement lawsuit
filed by Abbott Laboratories and obtained a license to the contested patent in
return for the payment of $5.5 million and the agreement to pay certain
royalties. There can be no assurance that the Company will not in the future
become subject to patent infringement claims and litigation or interference
proceedings conducted in the USPTO to determine the priority of inventions. The
defense and prosecution of intellectual property suits, USPTO interference
proceedings, and related legal and administrative proceedings will result in
substantial expense to the Company and significant diversion of effort by the
Company's technical and management personnel. An adverse determination in
litigation or interference proceedings to which the Company may become a party
could subject the Company to significant liabilities to third parties. Further,
either as the result of such litigation or proceedings or otherwise, the Company
may be required to seek licenses from third parties which may not be available
on commercially reasonable terms, if at all.
 
     Triage DOA and products under development may incorporate technologies that
are the subject of patents issued to, and patent applications filed by, others.
The Company has obtained licenses for certain technologies. However, there can
be no assurance that the Company will be able to obtain licenses for technology
patented by others on commercially reasonable terms, if at all, that it will be
able to develop alternative approaches if unable to obtain licenses or that the
Company's current and future licenses will be adequate for the operation of
Biosite's business. The failure to obtain necessary licenses or to identify and
implement alternative approaches would prevent the Company from commercializing
certain of its products under development and would have a material adverse
effect on the Company's business, financial condition and results of operations.
 
     Biosite is aware of a U.S. patent owned by Celltech relating to the
manufacture of antibodies, such as those developed or being developed by Biosite
for Triage Cardiac, Triage O&P, Triage C. diff and Triage Enteric. Biosite is
also aware that this patent is the subject of an interference proceeding in the
USPTO which was initiated in February 1991 with a patent application filed by
Genentech. In June 1996, the EPO invalidated, following an opposition, certain
claims under Celltech's corresponding EPO-granted patent which are relevant to
Biosite's products and products under development. Celltech has indicated that
it will appeal such decision. If it is determined that certain manufacturing
aspects of Biosite's antibodies are covered by patent claims stemming from the
interference or if Celltech were to have such claims upheld on appeal, Biosite
may be required to obtain a license under such patents and corresponding patents
in other countries. There can be no assurance that a license would be made
available to Biosite on commercially reasonable terms, if at all. If such
license is required and not obtained the Company might be prevented from using
certain of its technologies. The Company's failure to obtain any required
licenses could have a material adverse effect on the Company's business,
financial condition and results of operations.
 
     The Company also relies upon trade secrets, technical know-how and
continuing invention to develop and maintain its competitive position. There can
be no assurance that others will not independently develop substantially
equivalent proprietary information and techniques or otherwise gain access to
the Company's trade secrets or disclose such technology, or that the Company can
meaningfully protect its right to its trade secrets, or that the Company will be
capable of protecting its rights to its trade secrets.
 
     Others may have filed and in the future are likely to file patent
applications that are similar or identical to those of the Company. To determine
the priority of inventions, the Company may have to participate in
 
                                       37
<PAGE>   41
 
interference proceedings declared by the USPTO that could result in substantial
cost to the Company. No assurance can be given that any patent application of
another will not have priority over patent applications filed by the Company.
 
     The commercial success of the Company also depends in part on the Company
neither infringing patents or proprietary rights of third parties nor breaching
any licenses that may relate to the Company's technologies and products. The
Company is aware of several third-party patents that relate to the Company's
technology. There can be no assurance that the Company does not or will not
infringe these patents, or other patents or proprietary rights of third parties.
In addition, the Company has received and may in the future receive notices
claiming infringement from third parties as well as invitations to take licenses
under third party patents. Any legal action against the Company or its
collaborative partners claiming damages and seeking to enjoin commercial
activities relating to the Company's products and processes affected by third
party rights, in addition to subjecting the Company to potential liability for
damages, may require the Company or its collaborative partner to obtain a
license in order to continue to manufacture or market the affected products and
processes. There can be no assurance that the Company or its collaborative
partners would prevail in any such action or that any license (including
licenses proposed by third parties) required under any such patent would be made
available on commercially acceptable terms, if at all. There are a significant
number of U.S. and foreign patents and patent applications in the Company's
areas of interest, and the Company believes that there may be significant
litigation in the industry regarding patent and other intellectual property
rights. If the Company becomes involved in such litigation, it could consume a
substantial portion of the Company's managerial and financial resources, which
could have a material adverse effect on the Company's business, financial
condition and results of operations.
 
COMPETITION
 
     The market in which the Company competes is intensely competitive.
Biosite's competitors include health care companies that manufacture
laboratory-based tests and analyzers, as well as clinical and hospital-based
laboratories. Currently, the majority of diagnostic tests used by physicians and
other health care providers are performed by independent clinical and
hospital-based laboratories. The Company expects that these laboratories will
compete vigorously to maintain their dominance of the testing market. In order
to achieve market acceptance for its products, the Company will be required to
demonstrate that its products are an attractive alternative to testing performed
by clinical and hospital-based laboratories. This will require physicians to
change their established means of having such tests performed. There can be no
assurance that the Company's products will be able to compete with the testing
services provided by these laboratories. In addition, companies with a
significant presence in the diagnostic market, such as Abbott Laboratories,
Boehringer Mannheim, Chiron Diagnostics, Clinical Diagnostic Systems, a division
of Johnson & Johnson, DADE International, and Roche Biosciences, Inc., have
developed or are developing diagnostic products that do or will compete with the
Company's products. These competitors have substantially greater financial,
technical, research and other resources and larger, more established marketing,
sales, distribution and service organizations than the Company. Moreover, such
competitors offer broader product lines and have greater name recognition than
the Company, and offer discounts as a competitive tactic. In addition, several
smaller companies are currently making or developing products that compete with
or will compete with those of the Company. There can be no assurance that the
Company's competitors will not succeed in developing or marketing technologies
or products that are more effective or commercially attractive than the
Company's current or future products, or that would render the Company's
technologies and products obsolete. Moreover, there can be no assurance that the
Company will have the financial resources, technical expertise or marketing,
distribution or support capabilities to compete successfully in the future. In
addition, there can be no assurance that competitors, many of which have made
substantial investments in competing technologies that may be more effective
than the Company's technologies will not prevent, limit or interfere with the
Company's ability to make, use or sell its products either in the United States
or in international markets. See "-- Products and Products under Development"
and "-- Technology."
 
GOVERNMENT REGULATION
 
     The testing, manufacture and sale of the Company's products are subject to
regulation by numerous governmental authorities, principally the FDA and
corresponding state and foreign regulatory agencies.
 
                                       38
<PAGE>   42
 
Pursuant to the Federal Food, Drug, and Cosmetic Act, and the regulations
promulgated thereunder, the FDA regulates the preclinical and clinical testing,
manufacture, labeling, distribution and promotion of medical devices. The
Company will not be able to commence marketing or commercial sales in the United
States of new products under development until it receives clearance or approval
from the FDA, which can be a lengthy, expensive and uncertain process.
Noncompliance with applicable requirements can result in, among other things,
fines, injunctions, civil penalties, recall or seizure of products, total or
partial suspension of production, failure of the government to grant premarket
clearance or premarket approval for devices, withdrawal of marketing clearances
or approvals and criminal prosecution. The FDA also has the authority to request
recall, repair, replacement or refund of the cost of any device manufactured or
distributed by the Company.
 
     In the United States, medical devices are classified into one of three
classes (i.e., Class I, II or III) on the basis of the controls deemed necessary
by the FDA to reasonably ensure their safety and effectiveness. Class I devices
are subject to general controls (e.g., labeling, premarket notification and
adherence to cGMP) and Class II devices are subject to general and special
controls (e.g., performance standards, postmarket surveillance, patient
registries, and FDA guidelines). Generally, Class III devices are those which
must receive premarket approval by the FDA to ensure their safety and
effectiveness (e.g., life-sustaining, life-supporting and implantable devices,
or new devices which have been found not to be substantially equivalent to
legally marketed devices).
 
     Before a new device can be introduced in the market, the manufacturer must
generally obtain FDA clearance or approval through either clearance of a 510(k)
notification or approval of a PMA application. A PMA application must be filed
if a proposed device is a new device not substantially equivalent to a legally
marketed Class I or Class II device, or if it is a preamendment Class III device
for which the FDA has called for PMAs. A PMA application must be supported by
valid scientific evidence to demonstrate the safety and effectiveness of the
device, typically including the results of clinical trials, bench tests,
laboratory and animal studies. The PMA application must also contain a complete
description of the device and its components, and a detailed description of the
methods, facilities and controls used to manufacture the device. In addition,
the submission must include the proposed labeling, advertising literature and
any training materials. The PMA approval process can be expensive, uncertain and
lengthy, and a number of devices for which FDA approval has been sought by other
companies have never been approved for marketing.
 
     Upon receipt of a PMA application, the FDA makes a threshold determination
as to whether the application is sufficiently complete to permit a substantive
review. If the FDA determines that the PMA application is sufficiently complete
to permit a substantive review, the FDA will accept the application for filing.
Once the submission is accepted for filing, the FDA begins an in-depth review of
the PMA. The FDA review of a PMA application generally takes one to three years
from the date the PMA is accepted for filing, but may take significantly longer.
The review time is often significantly extended by the FDA asking for more
information or clarification of information already provided in the submission.
During the review period, an advisory committee, typically a panel of
clinicians, will likely be convened to review and evaluate the application and
provide recommendations to the FDA as to whether the device should be approved.
The FDA is not bound by the recommendation of the advisory panel. Toward the end
of the PMA review process, the FDA generally will conduct an inspection of the
manufacturer's facilities to ensure that the facilities are in compliance with
applicable cGMP requirements. If FDA evaluations of both the PMA application and
the manufacturing facilities are favorable, the FDA may issue either an approval
letter or an approvable letter, which usually contains a number of conditions
that must be met in order to secure final approval of the PMA. When and if those
conditions have been fulfilled to the satisfaction of the FDA, the agency will
issue a PMA approval letter, authorizing commercial marketing of the device for
certain indications. If the FDA's evaluation of the PMA application or
manufacturing facilities is not favorable, the FDA will deny approval of the PMA
application or issue a "non-approvable" letter. The FDA may determine that
additional clinical trials are necessary, in which case the PMA may be delayed
for one or more years while additional clinical trials are conducted and
submitted in an amendment to the PMA. Modifications to a device that is the
subject of an approved PMA, its labeling, or manufacturing process may require
approval by the FDA of PMA supplements or new PMAs. Supplements to an approved
PMA often require the submission of the same type
 
                                       39
<PAGE>   43
 
of information required for an initial PMA, except that the supplement is
generally limited to that information needed to support the proposed change from
the product covered by the original PMA.
 
     A 510(k) clearance will be granted if the submitted information establishes
that the proposed device is "substantially equivalent" to a legally marketed
Class I or Class II medical device or a preamendment Class III medical device
for which the FDA has not called for PMAs. The FDA recently has been requiring
more rigorous demonstration of substantial equivalence than in the past,
including in some cases requiring submission of clinical data. It generally
takes from four to 12 months from submission to obtain 510(k) premarket
clearance, but may take longer. The FDA may determine that a proposed device is
not substantially equivalent to a legally marketed device, or that additional
information is needed before a substantial equivalence determination can be
made. A "not substantially equivalent" determination, or a request for
additional information, could prevent or delay the market introduction of new
products that fall into this category. For any devices that are cleared through
the 510(k) process, modifications or enhancements that could significantly
affect safety or effectiveness, or constitute a major change in the intended use
of the device, will require new 510(k) submissions.
 
     The Company has made modifications to its Triage DOA product since receipt
of initial 510(k) clearance. With respect to several of these modifications, the
Company has filed new 510(k) notices describing the modifications, and has
received FDA clearance of those 510(k) notices. The Company has made other
modifications to its Triage DOA product which the Company believes do not
require the submission of new 510(k) notices. There can be no assurance,
however, that the FDA would agree with any of the Company's determinations not
to submit a new 510(k) notice for any of these modifications, or would not
require the Company to submit a new 510(k) notice for any of these modifications
made to Triage DOA. If the FDA requires the Company to submit a new 510(k)
notice for any device modification, the Company may be prohibited from marketing
the modified Triage DOA until the 510(k) notice is cleared by the FDA.
 
     The Company is uncertain of the regulatory path to market that FDA will
ultimately apply to the Company's products currently in development. Although
Triage DOA received 510(k) clearance, a PMA may be required for Triage Cardiac
and Triage Transplant tests now in development. There can be no assurance for
any of the Company's products in development that FDA will not determine that
the Company must adhere to the more costly, lengthy and uncertain PMA approval
process.
 
     There can be no assurance that the Company will be able to obtain necessary
regulatory approvals or clearances for its products on a timely basis if at all,
and delays in receipt of or failure to receive such approvals or clearances, the
loss of previously received approvals or clearances, limitations on intended use
imposed as a condition of such approvals or clearances, or failure to comply
with existing or future regulatory requirements would have a material adverse
effect on the Company's business, financial condition and results of operations.
 
     Before the manufacturer of a device can submit the device for FDA approval
or clearance, it generally must conduct a clinical investigation of the device.
Although clinical investigations of most devices are subject to the IDE
requirements, clinical investigations of IVD tests, such as all of the Company's
products and products under development, are exempt from the IDE requirements,
including the need to obtain the FDA's prior approval, provided the testing is
noninvasive, does not require an invasive sampling procedure that presents a
significant risk, does not intentionally introduce energy into the subject, and
is not used as a diagnostic procedure without confirmation by another medically
established test or procedure. In addition, the IVD must be labeled for RUO or
IUO, and distribution controls must be established to assure that IVDs
distributed for research or clinical investigation are used only for those
purposes.
 
     The Company intends to conduct clinical investigations of its products
under development, which will entail distributing them in the United States on
an IUO basis. There can be no assurance that the FDA would agree that the
Company's IUO distribution of its IVD products under development will meet the
requirements for IDE exemption. Furthermore, failure by the Company or the
recipients of its products under development to maintain compliance with the IDE
exemption requirements could result in enforcement action by the FDA, including,
among other things, the loss of the IDE exemption or the imposition of other
restrictions on the Company's distribution of its products under development,
which would adversely affect the Company's ability to conduct the clinical
investigations necessary to support marketing clearance or approval.
 
                                       40
<PAGE>   44
 
     Any devices manufactured or distributed by the Company pursuant to FDA
clearance or approvals are subject to pervasive and continuing regulation by FDA
and certain state agencies. Manufacturers of medical devices for marketing in
the United States are required to adhere to applicable regulations setting forth
detailed cGMP requirements, which include testing, control and documentation
requirements. Manufacturers must also comply with MDR requirements that a
manufacturer report to the FDA any incident in which its product may have caused
or contributed to a death or serious injury, or in which its product
malfunctioned and, if the malfunction were to recur, it would be likely to cause
or contribute to a death or serious injury. Labeling and promotional activities
are subject to scrutiny by the FDA and, in certain circumstances, by the Federal
Trade Commission. Current FDA enforcement policy prohibits the marketing of
approved medical devices for unapproved uses.
 
     The Company is subject to routine inspection by the FDA and certain state
agencies for compliance with cGMP requirements, MDR requirements, and other
applicable regulations. The FDA has recently finalized changes to the cGMP
requirements, including the addition of design controls that will likely
increase the cost of compliance. Changes in existing requirements or adoption of
new requirements could have a material adverse effect on the Company's business,
financial condition and results of operation. There can be no assurance that the
Company will not incur significant costs to comply with laws and regulations in
the future or that laws and regulations will not have a material adverse effect
upon the Company's business, financial condition and results of operations.
 
     The Company also is subject to numerous federal, state and local laws
relating to such matters as safe working conditions, manufacturing practices,
environmental protection, fire hazard control and disposal of hazardous or
potentially hazardous substances. There can be no assurance that the Company
will not incur significant costs to comply with laws and regulations in the
future or that such laws or regulations will not have a material adverse effect
upon the Company's business, financial condition and results of operations.
 
     The use of Biosite's products is also affected by CLIA and related federal
and state regulations which provide for regulation of laboratory testing. The
scope of these regulations includes quality control, proficiency testing,
personnel standards and federal inspections. CLIA categorizes tests as "waived,"
or as being "moderately complex" or "highly complex," on the basis of specific
criteria. There can be no assurance that any future amendment of CLIA or the
promulgation of additional regulations impacting laboratory testing will not
have an adverse effect on the Company's ability to market its products or on its
business, financial condition and results of operations.
 
EMPLOYEES
 
     As of November 30, 1996, Biosite employed 162 individuals. Of these, 17
hold Ph.D.s and 13 hold other advanced degrees. None of the Company's employees
is covered by collective bargaining agreement. The Company believes that it
maintains good relations with its employees.
 
FACILITIES
 
     The Company currently leases approximately 83,000 square feet of space in
five buildings in the Sorrento Valley area in San Diego under leases that expire
from September 1997 through September 1998 with renewal options through 2001.
The Company believes these facilities are adequate for its current needs and
that suitable additional or alternative space will be available in the future on
commercially reasonable terms as needed. The Company's current facilities are
used for its administrative offices, research and development facilities and
manufacturing operations.
 
LEGAL PROCEEDINGS
 
     The Company is not a party to any material legal proceedings.
 
                                       41
<PAGE>   45
 
                                   MANAGEMENT
 
DIRECTORS AND EXECUTIVE OFFICERS
 
     The directors and executive officers of the Company, their positions with
the Company and ages as of September 30, 1996 are as follows:
 
<TABLE>
<CAPTION>
                NAME                  AGE                             POSITION
- ------------------------------------  ---     ---------------------------------------------------------
<S>                                   <C>     <C>
Kim D. Blickenstaff.................   44     President, Chief Executive Officer, Treasurer, Secretary
                                                and Director
Gunars E. Valkirs, Ph.D. ...........   44     Vice President, Research and Development, Chief
                                                Technical Officer and Director
Thomas M. Watlington................   41     Senior Vice President
Charles W. Patrick..................   42     Vice President, Sales and Marketing
Christopher J. Twomey...............   37     Vice President, Finance and Chief Financial Officer
S. Nicholas Stiso, Ph.D. ...........   52     Vice President, Operations
Kenneth F. Buechler, Ph.D. .........   42     Vice President, Research
Timothy J. Wollaeger(1)(2)..........   53     Chairman of the Board
Thomas Adams, Ph.D. ................   53     Director
Frederick J. Dotzler(1)(2)..........   51     Director
Howard E. Greene, Jr. ..............   53     Director
Stephen K. Reidy....................   46     Director
Jesse I. Treu, Ph.D. ...............   49     Director
</TABLE>
 
- ---------------
(1) Member of Compensation Committee.
 
(2) Member of Audit Committee.
 
     KIM D. BLICKENSTAFF, a founder of the Company, has been a director and the
Company's President, Chief Executive Officer, Treasurer and Secretary since
April 1988. He has held various positions in finance, operations, research
management, sales management, strategic planning, and marketing with Baxter
Travenol, National Health Laboratories, and Hybritech Incorporated
("Hybritech"). Mr. Blickenstaff holds an M.B.A. from the Graduate School of
Business, Loyola University, Chicago.
 
     GUNARS E. VALKIRS, PH.D., a founder of Biosite and a co-inventor of certain
of its proprietary technology has been a director since April 1988 and Vice
President, Research and Development and Chief Technical Officer since 1988.
Prior to forming Biosite, he was a Scientific Investigator with the Diagnostics
Research & Development Group at Hybritech, where he was the primary inventor of
Hybritech's patented ICON technology. Dr. Valkirs holds a Ph.D. in Physics from
the University of California at San Diego.
 
     THOMAS M. WATLINGTON joined the Company as Senior Vice President in
December 1996. He was formerly Vice President, Marketing for the Diabetes Care
Division for Boehringer Mannheim. From 1982 to December 1996, Mr. Watlington
held various positions in marketing, strategic analysis and product development
with Boehringer Mannheim. Mr. Watlington holds a B.S. degree from the University
of Maryland.
 
     CHARLES W. PATRICK joined the Company in August 1990 as Vice President,
Sales and Marketing. From 1978 to August 1990, Mr. Patrick held various
positions in sales, sales management and product and marketing management with
Abbott. From 1987 to August 1990, he was Group Marketing Manager for the Abused
Drug Business Unit of Abbott where he managed the worldwide product launch of
Abbott's TDx and ADx bench top testing systems. Mr. Patrick holds a B.A. from
the University of Central Florida.
 
     CHRISTOPHER J. TWOMEY joined the Company as Director of Finance in March
1990 and was promoted to Vice President of Finance and Chief Financial Officer
in 1993. From 1981 to March 1990, Mr. Twomey worked for Ernst & Young LLP, where
from October 1985 to March 1990, he served as Audit Manager. Mr. Twomey holds a
B.A. in Business Economics from the University of California at Santa Barbara.
 
                                       42
<PAGE>   46
 
     S. NICHOLAS STISO, PH.D. joined the Company as Vice President, Operations
in November 1989. Prior to joining Biosite, he was with Syntex Medical
Diagnostics, a division of SYVA Co., where from April 1980 to April 1989, he was
Manufacturing Director for the AccuLevel line of quantitative, non-instrumented,
therapeutic drug assays. Dr. Stiso holds a Ph.D. in Physical Chemistry from
Michigan State University in East Lansing, Michigan.
 
     KENNETH F. BUECHLER, PH.D., a founder of Biosite and a co-inventor of
certain of Biosite's proprietary technology, has been Vice President, Research
since January 1994. Prior to that time, he was Director of Chemistry. Prior to
forming Biosite, he was a Senior Scientist in the Diagnostics Research and
Development Group at Hybritech. Dr. Buechler holds a Ph.D. in Biochemistry from
Indiana University.
 
     TIMOTHY J. WOLLAEGER has served as Chairman of the Board of Directors since
the Company's inception. He is the general partner of Kingsbury Associates,
L.P., a venture capital firm he founded in December 1993. From May 1990 until
December 1993, he was Senior Vice President and a director of Columbia Hospital
Corporation (now Columbia/HCA Healthcare Corporation). From October 1986 until
July 1993, he was a general partner of the general partner of Biovest Partners,
A California Limited Partnership ("Biovest"), a seed venture capital firm. From
1983 to 1986, Mr. Wollaeger served as Senior Vice President and Chief Financial
Officer of Hybritech. He is a director of Amylin Pharmaceuticals, Inc.
("Amylin") and Phamis, Inc., and a founder and director of several privately
held medical products companies. He received an M.B.A. from Stanford University.
 
     THOMAS ADAMS, PH.D. joined the Board of Directors in September 1988. Dr.
Adams was a founder of Genta Incorporated, a biotechnology company, and has been
Chairman of the Board and Chief Executive Officer of Genta since February 1989.
He previously served as Chairman of the Board and Chief Executive Officer of
Gen-Probe Incorporated ("Gen-Probe"), which he co-founded in 1984. Prior to
joining Gen-Probe, he held the positions of Senior Vice President of Research &
Development and Chief Technical Officer at Hybritech. He had previously held
senior scientific management positions with Technicon Instruments Corp., the
Hyland Laboratories Division of Baxter Travenol, and DuPont. Dr. Adams is a
director of Genta Incorporated, Life Technologies, Inc., La Jolla Pharmaceutical
Company and two private biotechnology companies. He received his Ph.D. in
Biochemistry from the University of California at Riverside.
 
     FREDERICK J. DOTZLER joined the Board of Directors in July 1989. Mr.
Dotzler is General Partner of Medicus Venture Partners, a venture capital firm
he founded in 1989. Prior to founding Medicus, Mr. Dotzler was a general partner
of Crosspoint Venture Partners. Previously he held management positions with
Millipore Corporation, G.D. Searle & Co., and IBM. He is a director of several
privately held companies. Mr. Dotzler received a B.S. in Industrial Engineering
from Iowa State University, an M.B.A. from the University of Chicago, and a
degree in Economics from the University of Louvain, Belgium.
 
     HOWARD E. GREENE, JR. joined the Board of Directors in June 1989. Mr.
Greene is a founder and Chairman of the Board of Amylin, a biotechnology company
in late stage development of a drug candidate for diabetes, and he was Chief
Executive Officer of Amylin from inception in September 1987 to July 1996. From
October 1986 until July 1993, Mr. Greene was a general partner of the general
partner of Biovest. From March 1979 to March 1986, he was Chief Executive
Officer of Hybritech, and he was a co-inventor of Hybritech's monoclonal
antibody assay technology. Prior to joining Hybritech, he was an executive with
the medical diagnostics division of Baxter Healthcare Corporation from 1974 to
1979 and a consultant with McKinsey & Company from 1967 to 1974. He is Chairman
of the Board of Cytel Corporation, a director of Allergan, Inc., Neurex
Corporation and The International Biotechnology Trust plc, a foreign
biotechnology investment company. Mr. Greene received an M.B.A. from Harvard
University.
 
     STEPHEN K. REIDY joined the Board of Directors in July 1989. Since 1987,
Mr. Reidy has been affiliated with Euclid Partners Corporation, a company
engaged in venture capital investments in the health care and information
technology industries. Mr. Reidy is a general partner of the General Partner of
Euclid Partners III, L.P. and Euclid Partners IV, L.P. He is a director of
Zynaxis, Inc., a drug delivery company, Chairman of the Board of a privately
held neurological company and a director of a privately-held hospital software
company. Mr. Reidy has an M.B.A. from Columbia University.
 
                                       43
<PAGE>   47
 
     JESSE I. TREU, PH.D. joined the Board of Directors in June 1990. He has
been a general partner of Domain Associates, a venture capital firm specializing
in life sciences since 1986. Before joining Domain Associates in 1986, he was a
principal of Channing, Weinberg and Company, Inc., and its venture capital
spin-off CW Ventures, and was a director of Technicon Corporation responsible
for marketing strategy and new product development in immunology and
histopathology and previously held research and development, management and
corporate staff positions at General Electric Company. Dr. Treu is a director of
DNX Corporation, a pharmaceutical testing company, Geltex Pharmaceuticals, Inc.,
a developer of polymer based pharmaceuticals, and Lumisys, Inc., an
electro-optical systems company. Dr. Treu received a Ph.D. in Physics from
Princeton University.
 
     The Company currently has authorized eight directors. Upon the closing of
this offering, the Company will have three classes of directors serving
staggered three-year terms. All directors are elected to hold office until the
next annual meeting of stockholders of the Company in which their three-year
term expires and until their successors have been elected. The Company's
officers are appointed by the directors and serve at the discretion of the Board
of Directors. There are no family relationships among any of the directors or
executive officers of the Company.
 
BOARD COMMITTEES
 
     The Board of Directors has established an Audit Committee and a
Compensation Committee. The Audit Committee, which consists of Mr. Dotzler and
Mr. Wollaeger, reviews the results and scope of the annual audit and the
services provided by the Company's independent accountants. The Compensation
Committee, which consists of Mr. Dotzler and Mr. Wollaeger, makes
recommendations to the Board of Directors with respect to general and specific
compensation policies and practices of the Company and administers the Amended
and Restated 1989 Stock Plan of Biosite (the "1989 Stock Plan"), the 1996 Stock
Incentive Plan of Biosite (the "1996 Stock Plan") and the Biosite Employee Stock
Purchase Plan (the "ESPP").
 
COMPENSATION COMMITTEE INTERLOCKS AND INSIDER PARTICIPATION
 
     The members of the Company's Compensation Committee during 1995 were Mr.
Dotzler and Mr. Wollaeger. There were no interlocks or other relationships among
the Company's executive officers and directors that are required to be disclosed
under applicable executive compensation disclosure regulations.
 
COMPENSATION OF DIRECTORS
 
     Directors do not receive any fees for service on the Board of Directors.
Directors are reimbursed for their expenses for each meeting attended. Directors
are eligible to participate in the 1996 Stock Plan described below, although as
of the date of this Prospectus, no options have been granted to non-employee
directors.
 
                                       44
<PAGE>   48
 
EXECUTIVE COMPENSATION
 
     The following table sets forth compensation paid or awarded by the Company
during the fiscal year ended December 31, 1995 to the Company's Chief Executive
Officer and the Company's four most highly compensated executive officers other
than the Chief Executive Officer whose salary and bonus exceeded $100,000 during
the fiscal year.
 
                           SUMMARY COMPENSATION TABLE
 
<TABLE>
<CAPTION>
                                                                                               LONG-TERM
                                                                                              COMPENSATION
                                                           ANNUAL COMPENSATION                   AWARDS
                                               --------------------------------------------    SECURITIES
                                                                                OTHER          UNDERLYING
      NAME AND PRINCIPAL POSITION       YEAR   SALARY ($)(1)   BONUS ($)   COMPENSATION ($)     OPTIONS
- --------------------------------------- ----   -------------   ---------   ----------------   ------------
<S>                                     <C>    <C>             <C>         <C>                <C>
Kim D. Blickenstaff.................... 1995     $ 169,633      $78,462        $    900          40,000
  President and Chief Executive Officer
Charles W. Patrick..................... 1995       151,000       27,002          59,290(2)        5,000
  Vice President, Sales and Marketing
Gunars E. Valkirs...................... 1995       139,208       36,244             793          25,000
  Vice President, Research and
     Development
Kenneth F. Buechler.................... 1995       125,823       36,244             709          25,000
  Vice President, Research
S. Nicholas Stiso...................... 1995       134,554       27,002           1,787          20,000
  Vice President, Operations
</TABLE>
 
- ---------------
(1) Includes amounts deferred by each individual under the Company's 401(k) plan
    for the years in which earned.
(2) Includes forgiveness of a $36,000 relocation loan made in August 1990 which
    was forgiven in August 1995 and $22,776 related to income taxes associated
    with the forgiveness of the loan.
 
     The following tables set forth certain information as of December 31, 1995
and for the fiscal year then ended with respect to stock options granted to and
exercised by the individuals named in the Summary Compensation Table above.
 
                       OPTION GRANTS IN FISCAL YEAR 1995
                               INDIVIDUAL GRANTS
 
<TABLE>
<CAPTION>
                                                                                           POTENTIAL REALIZABLE VALUE
                                                                                            AT ASSUMED ANNUAL RATES
                                                PERCENTAGE OF                                    OF STOCK PRICE
                                                TOTAL OPTIONS                                     APPRECIATION
                                                 GRANTED TO     EXERCISE OR                    FOR OPTION TERM(3)
                                    OPTIONS     EMPLOYEES IN    BASE PRICE    EXPIRATION   --------------------------
              NAME                GRANTED (1)    FISCAL YEAR     ($/SH)(2)       DATE        5% ($)          10% ($)
- --------------------------------  -----------   -------------   -----------   ----------   -----------       --------
<S>                               <C>           <C>             <C>           <C>          <C>               <C>
Kim D. Blickenstaff.............     40,000          13.3%         $3.00        4/19/05      $10,312         $ 87,499
Charles W. Patrick..............      5,000           1.7           3.00        4/19/05        1,289           10,937
Gunars E. Valkirs...............     25,000           8.3           3.00        4/19/05        6,445           54,687
Kenneth F. Buechler.............     25,000           8.3           3.00        4/19/05        6,445           54,687
S. Nicholas Stiso...............     20,000           6.7           3.00        4/19/05        5,156           43,750
</TABLE>
 
- ---------------
(1) These options vest daily over a four-year period commencing on the date of
    grant, except that no options are exercisable for the first six months after
    grant.
(2) The exercise price of each option is equal to 150% of the fair market value
    of the Common Stock on the date of grant, as determined by the Compensation
    Committee of the Board of Directors.
(3) The potential realizable value of each grant of options has been calculated,
    pursuant to the regulations promulgated by the Securities and Exchange
    Commission, assuming that the market price of the Common Stock appreciates
    in value from the date of grant to the end of the option term at the
    annualized rates of 5% and 10%, respectively. These values do not represent
    the Company's estimate or projection of future Common Stock value. There can
    be no assurance that any of the value reflected in the table will be
    achieved.
 
                                       45
<PAGE>   49
 
                AGGREGATED OPTION EXERCISES IN FISCAL YEAR 1995
                    AND OPTION VALUES AT END OF FISCAL 1995
 
<TABLE>
<CAPTION>
                                                                         NUMBER OF            VALUE OF
                                                                         SECURITIES         UNEXERCISED
                                                                         UNDERLYING         IN-THE-MONEY
                                                                        UNEXERCISED          OPTIONS AT
                                                                         OPTIONS AT            FISCAL
                                                                     FISCAL YEAR-END(#)     YEAR-END($)
                                                                     ------------------   ----------------
                                     SHARES ACQUIRED      VALUE         EXERCISABLE/        EXERCISABLE/
                NAME                 ON EXERCISE(#)    REALIZED($)     UNEXERCISABLE       UNEXERCISABLE
- ------------------------------------ ---------------   -----------   ------------------   ----------------
<S>                                  <C>               <C>           <C>                  <C>
Kim D. Blickenstaff.................          --         $    --        60,755/42,445     $135,580/$30,620
Charles W. Patrick..................      25,000          44,000        39,412/ 7,988      105,803/  9,847
Gunars E. Valkirs...................      10,000          27,000        47,946/30,254      105,378/ 25,572
Kenneth F. Buechler.................       4,000          11,800        47,977/36,223       99,819/ 30,431
S. Nicholas Stiso...................      11,838          11,838         5,383/20,179        4,620/ 12,895
</TABLE>
 
- ---------------
(1) Calculated on the basis of the fair market value of the underlying
    securities at December 31, 1995, the fiscal year-end, minus the exercise
    price.
 
  Amended and Restated 1989 Stock Plan
 
     In July 1989, the Company's Board of Directors adopted the 1989 Stock Plan.
The 1989 Stock Plan was amended at various times from its adoption to the date
of this Prospectus to increase the number of shares available under the 1989
Stock Plan. A total of 1,692,000 shares of Common Stock is currently reserved
for issuance under the 1989 Stock Plan pursuant to the direct award or sale of
shares or the exercise of options granted under the 1989 Stock Plan. If any
option granted under the 1989 Stock Plan expires or terminates for any reason
without having been exercised in full, then the unpurchased shares subject to
that option will once again be available for additional option grants.
Unpurchased shares pursuant to options that expire or terminate under the 1989
Stock Plan shall be available for awards under the 1996 Stock Plan.
 
     Under the 1989 Stock Plan, all employees (including officers) and directors
of the Company or any subsidiary and any independent contractor or advisor who
performs services for the Company or a subsidiary are eligible to purchase
shares of Common Stock and to receive awards of shares or grants of nonstatutory
options. Employees are also eligible to receive grants of incentive stock
options ("ISOs") intended to qualify under Section 422 of the Internal Revenue
Code. The 1989 Stock Plan is administered by a committee of the Board of
Directors of the Company, which selects the persons to whom shares will be sold
or awarded or options will be granted, determines the number of shares to be
made subject to each sale, award or grant, and prescribes other terms and
conditions, including the type of consideration to be paid to the Company upon
sale or exercise and vesting schedules, in connection with each sale, award or
grant.
 
     The exercise price under the nonstatutory options generally must be at
least 85% of the fair market value of the Common Stock on the date of grant. The
exercise price under ISOs cannot be lower than 100% of the fair market value of
the Common Stock on the date of grant and, in the case of ISOs granted to
holders of more than 10% of the voting power of the Company, not less than 110%
of such fair market value. The term of an option cannot exceed 10 years, and the
term of an ISO granted to a holder of more than 10% of the voting power of the
Company cannot exceed five years. Options generally expire not later than 90
days following a termination of employment or six months following the
optionee's death or permanent disability. The purchase price of shares sold
under the 1989 Stock Plan generally must be at least 85% of the fair market
value of the Common Stock and, in the case of a holder of more than 10% of the
voting power of the Company, not less than 110% of such fair market value. Under
the 1989 Stock Plan, options granted pursuant to the 1989 Stock Plan will
generally vest ratably over a period of four years.
 
     As of November 30, 1996, the Company had outstanding options to purchase an
aggregate of 1,180,204 shares of Common Stock at exercise prices ranging from
$0.24 to $8.25 per share, or a weighted average per
 
                                       46
<PAGE>   50
 
share exercise price of $3.24. At November 30, 1996, a total of 35,756 shares of
Common Stock was available for future issuance under the 1989 Stock Plan.
 
  1996 Stock Incentive Plan
 
     The 1996 Stock Plan was adopted by the Board of Directors on December 5,
1996, to be effective December 1, 1996, and was approved by the stockholders in
December 1996. The 1996 Stock Plan replaces the Company's 1989 Stock Plan.
Although all future awards will be made under the 1996 Stock Plan, awards made
under the 1989 Stock Plan will continue to be administered in accordance with
the 1989 Stock Plan. However, except as otherwise noted, the outstanding options
under the 1989 Plan contain substantially the same terms and conditions
specified below for option grants under the 1996 Stock Plan.
 
     The 1996 Stock Plan is administered by the Board of Directors or its
delegate. The Board, or its delegate, selects the employees of the Company who
will receive awards, determines the size of any award and establishes any
vesting or other conditions. Employees, directors, consultants and advisors of
the Company (or any subsidiary of the Company) are eligible to participate in
the 1996 Stock Plan, although incentive stock options may be granted only to
employees. No individual may receive options or stock appreciation rights
("SARs") covering more than 250,000 shares in any calendar year. The
participation of the outside directors of the Company is limited to 20% of
shares available under the 1996 Stock Plan.
 
     The 1996 Stock Plan provides for awards in the form of restricted shares,
stock units, options or SARs, or any combination thereof. No payment is required
upon receipt of an award, except that a recipient of newly issued restricted
shares must pay the par value of such restricted shares to the Company.
 
     Restricted shares are shares of Common Stock that are subject to repurchase
by the Company at the employee's purchase price in the event that the applicable
vesting conditions are not satisfied, and they are nontransferable prior to
vesting (except for certain transfers to a trustee). Restricted shares have the
same voting and dividend rights as other shares of Common Stock.
 
     A stock unit is an unfunded bookkeeping entry representing the equivalent
of one share of Common Stock, and is nontransferable prior to the holder's
death. A holder of a stock unit has no voting rights or other privileges as a
stockholder but may be entitled to receive dividend equivalents equal to the
amount of dividends paid on the same number of shares of Common Stock. Dividend
equivalents may be converted into additional stock units or settled in the form
of cash, Common Stock or a combination of both. Stock units, when vested, may be
settled by distributing shares of Common Stock or by a cash payment
corresponding to the fair market value of an equivalent number of shares of
Common Stock, or a combination of both. Vested stock units will be settled at
the time determined by the Compensation Committee. If the time of settlement is
deferred, interest or additional dividend equivalents may be credited on the
deferred payment.
 
     The recipient of restricted shares or stock units may pay all projected
withholding taxes relating to the award with Common Stock rather than cash.
 
     Options may include nonstatutory stock options ("NSOs") as well as ISOs
intended to qualify for special tax treatment. The term of an ISO cannot exceed
10 years (five years for 10% stockholders), and the exercise price of an ISO
must be equal to or greater than the fair market value of the Common Stock on
the date of grant (or 110% of fair market value at the date of grant for 10%
stockholders). The exercise price of an NSO must be equal to or greater than the
par value of the Common Stock on the date of grant.
 
     The exercise price of an option may be paid in any lawful form permitted by
the Compensation Committee, including (without limitation) the surrender of
shares of Common Stock or restricted shares already owned by the optionee. The
Compensation Committee may likewise permit optionees to satisfy their
withholding tax obligation upon exercise of an NSO by surrendering a portion of
their option shares to the Company. The 1996 Stock Plan also allows the optionee
to pay the exercise price of an option by giving "exercise/sale" or
"exercise/pledge" directions. If exercise/sale directions are given, a number of
option shares sufficient to pay the exercise price and any withholding taxes is
issued directly to a securities broker selected by the Company who, in turn,
sells these shares in the open market. The broker remits to the
 
                                       47
<PAGE>   51
 
Company the proceeds from the sale of these shares, and the optionee receives
the remaining option shares. If exercise/ pledge directions are given, the
option shares are issued directly to a securities broker or other lender
selected by the Company. The broker or other lender will hold the shares as
security and will extend credit for up to 50% of their market value. The loan
proceeds will be paid to the Company to the extent necessary to pay the exercise
price and any withholding taxes. Any excess loan proceeds may be paid to the
optionee. If the loan proceeds are insufficient to cover the exercise price and
withholding taxes, the optionee will be required to pay the deficiency to the
Company at the time of exercise.
 
     An SAR permits the participant to elect to receive any appreciation in the
value of the underlying stock from the Company, either in shares of Common Stock
or in cash or a combination of the two, with the Compensation Committee having
the discretion to determine the form in which such payment will be made. The
amount payable on exercise of an SAR is measured by the difference between the
market value of the underlying stock at exercise and the exercise price. SARs
may, but need not, be granted in conjunction with options. Upon exercise of an
SAR granted in tandem with an option, the corresponding portion of the related
option must be surrendered and cannot thereafter be exercised. Conversely, upon
exercise of an option to which an SAR is attached, the SAR may no longer be
exercised to the extent that the corresponding option has been exercised. All
options and SARs are nontransferable prior to the optionee's death.
 
     As noted above, the Compensation Committee determines the number of
restricted shares, stock units, options or SARs to be included in the award as
well as the vesting and other conditions. The vesting conditions may be based on
the employee's service, his or her individual performance, the Company's
performance or other appropriate criteria. In general, the vesting conditions
will be based on the employee's service after the date of grant. Vesting may be
accelerated in the event of the employee's death, disability or retirement or in
the event of a change in control with respect to the Company.
 
     For purposes of the 1996 Stock Plan, the term "change in control" does not
include this Offering or the consequences of this Offering but thereafter means
that (i) any person is or becomes the beneficial owner, directly or indirectly,
of at least 50% of the combined voting power of the Company's outstanding
securities ordinarily having the right to vote at elections of directors (ii)
approval by the stockholders of the Company of a merger or consolidation of the
Company with or into another corporation or entity or any other corporate
reorganization in which over 50% of the combined voting power of the continuing
or surviving entity immediately after the merger, consolidation or
reorganization is owned by persons who were not stockholders of the Company
immediately prior to the merger, consolidation or reorganization; or (iii) a
change in the composition of the Board of Directors in which fewer than half of
the incumbent Directors had been Directors 24 months prior to the change or were
elected or nominated with the affirmative votes of Directors 24 months prior to
the change.
 
     Awards under the 1996 Stock Plan may provide that if any payment (or
transfer) by the Company to a recipient would be nondeductible by the Company
for federal income tax purposes, then the aggregate present value of all such
payments (or transfers) will be reduced to an amount which maximizes such value
without causing any such payment (or transfer) to be nondeductible.
 
     The Board is authorized, within the provisions of the 1996 Stock Plan, to
amend the terms of outstanding restricted shares or stock units, to modify or
extend outstanding options or SARs or to exchange new options for outstanding
options, including outstanding options with a higher exercise price than the new
options.
 
     Members of the Company's Board of Directors who are not employees of the
Company are eligible for awards under the 1996 Stock Plan. However, such outside
directors are not eligible for ISO grants. Total shares available to outside
directors is limited to 20% of total shares available under the 1997 Stock Plan.
 
     As of December 1, 1996, no awards had been made under the 1996 Stock Plan.
The total number of restricted shares, stock units, options and SARs available
for grant under the 1996 Stock Plan is 900,000 (subject to anti-dilution
provisions), increased by the amount of all remaining shares available for grant
under the 1989 Stock Plan as of December 1, 1996. If any restricted shares,
stock units, options or SARs are forfeited, or if options or SARs terminate for
any other reason prior to exercise (other than the exercise of a
 
                                       48
<PAGE>   52
 
related SAR or option, and including any forfeiture or termination under the
1989 Stock Plan), then they again become available for awards under the 1996
Stock Plan.
 
  Employee Stock Purchase Plan
 
     The ESPP was adopted by the Board of Directors on December 5, 1996,
effective upon the completion of this Offering. The ESPP provides employees of
the Company with an opportunity to purchase Common Stock at a discount and pay
for their purchases through payroll deductions. All expenses incurred in
connection with the implementation and administration of the ESPP will be paid
by the Company. A pool of 100,000 shares of Common Stock has been reserved for
issuance under the ESPP (subject to anti-dilution provisions). Each regular
full-time and part-time employee who works an average of over 20 hours per week
will be eligible to participate in the ESPP at the beginning of the first
participation period after the employee's date of hire.
 
     Eligible employees may elect to contribute up to 10% of their cash
compensation under the ESPP. Each calendar year is divided into two six-month
"purchase periods," except that the entire period from the date of this offering
to June 30, 1997, will be a single purchase period. At the end of each purchase
period, the Company will apply the amount contributed by the participant during
that period to purchase shares of Common Stock for him or her. The purchase
price will be equal to 85% of the lower of (a) the market price of Common Stock
immediately before the beginning of the applicable offering period or (b) the
market price of Common Stock on the last business day of the purchase period. In
general each offering period is 24 months long, but a new offering period begins
every six months. Thus up to four overlapping periods may be in effect at the
same time. If the market price of Common Stock is lower when a subsequent
offering period begins, the subsequent offering period automatically becomes the
applicable offering period. No participant may purchase more than 2,500 shares
per purchase period, and the value of the Common Stock purchased each year
(measured at the beginning of the purchase periods) may not exceed $25,000 per
participant. Participants may withdraw their contributions at any time before
the close of the purchase period.
 
LIMITATION OF LIABILITY AND INDEMNIFICATION MATTERS
 
     The Company has adopted provisions in its Certificate of Incorporation that
limit the liability of its directors for monetary damages for breach of their
fiduciary duty as directors, except for liability that cannot be eliminated
under the Delaware General Corporation Law (the "Delaware Law"). The Delaware
Law provides that directors of a company will not be personally liable for
monetary damages for breach of their fiduciary duty as directors, except for
liability (i) for any breach of their duty of loyalty to the Company or its
stockholders, (ii) for acts or omissions not in good faith or which involve
intentional misconduct or a knowing violation of law, (iii) for unlawful payment
of dividend or unlawful stock repurchase or redemption, as provided in Section
174 of the Delaware Law, or (iv) for any transaction from which the director
derived an improper personal benefit. Any amendment or repeal of these
provisions requires the approval of the holders of shares representing at least
66-2/3% of the shares of the Company entitled to vote in the election of
directors, voting as one class.
 
     The Company's Certificate of Incorporation and By-Laws also provide that
the Company shall indemnify its directors and officers to the fullest extent
permitted by the Delaware Law. The Company has entered into separate
indemnification agreements with its directors and officers that could require
the Company, among other things, to indemnify them against certain liabilities
that may arise by reason of their status or service as directors and to advance
their expenses incurred as a result of any proceeding against them as to which
they could be indemnified. The Company believes that the limitation of liability
provision in its Restated Certificate of Incorporation and the indemnification
agreements will facilitate the Company's ability to continue to attract and
retain qualified individuals to serve as directors and officers of the Company.
 
                                       49
<PAGE>   53
 
                              CERTAIN TRANSACTIONS
 
     In June 1994, the Company entered into two agreements with Merck, a
collaborative development agreement and a supply and distribution agreement, in
connection with the Company's development of Triage Cardiac. Merck beneficially
owns more than 5% of the Company's Common Stock and distributes the Triage DOA
in certain counties in Europe, Latin America, the Middle East and Africa. See
"Business -- Strategic and Distribution Arrangements" and Note 1 and 3 of Notes
to Financial Statements.
 
     The Company believes that the foregoing transaction was in its best
interests. As a matter of policy this transaction was, and all future
transactions between the Company and its officers, directors or principal
shareholders will be, approved by a majority of the independent and
disinterested members of the Board of Directors, on terms no less favorable to
the Company than could be obtained from unaffiliated third parties and in
connection with bona fide business purposes of the Company.
 
                                       50
<PAGE>   54
 
                             PRINCIPAL STOCKHOLDERS
 
     The following table sets forth certain information regarding beneficial
ownership of the Company's Common Stock as of December 1, 1996 and as adjusted
to reflect the sale by the Company of the shares offered hereby, by: (i) each
person who is known by the Company to beneficially own more than 5% of the
Company's Common Stock, (ii) each of the Company's directors, (iii) each of the
Company's officers named under "Management -- Summary Compensation Table," and
(iv) all directors and executive officers of the Company as a group.
 
<TABLE>
<CAPTION>
                                                                                PERCENT BENEFICIALLY
                                                                                      OWNED(1)
                                                               SHARES          -----------------------
                     NAME AND ADDRESS                       BENEFICIALLY        BEFORE         AFTER
                   OF BENEFICIAL OWNER                         OWNED           OFFERING       OFFERING
- ----------------------------------------------------------  ------------       --------       --------
<S>                                                         <C>                <C>            <C>
Medicus Venture Partners(2)...............................     1,662,559         16.8%          14.0%
  2180 Sand Hill Road
  Suite 400
  Menlo Park, CA 94025
Kleiner, Perkins, Caufield & Byers V(3)...................     1,485,476         15.0           12.3
  2750 Sand Hill Road
  Menlo Park, CA 94025
Merck KGaA................................................     1,041,667         10.5            8.8
  Frankfurter Strasse 250
  D-6100 Darmstadt 1
  Federal Republic of Germany
Euclid Partners III, L.P. ................................     1,005,869         10.2            8.5
  50 Rockefeller Plaza
  New York, NY 10020
Kingsbury Capital Partners, L.P. .........................       635,417          6.4            5.4
  3655 Nobel Drive, Suite 490
  San Diego, CA 92122
Frederick J. Dotzler(2)...................................     1,662,559         16.8           14.0
Stephen K. Reidy(4).......................................     1,005,869         10.2            8.5
Timothy J. Wollaeger(5)...................................       707,015          7.2            6.0
Jesse I. Treu, Ph.D.(6)...................................       329,167          3.3            2.8
Howard E. Greene, Jr.(7)..................................       297,927          3.0            2.5
Thomas Adams, Ph.D. ......................................        53,833            *              *
Gunars E. Valkirs(8)(9)...................................       290,512          2.9            2.4
Kim D. Blickenstaff(8)....................................       288,232          2.9            2.4
Kenneth F. Buechler(8)....................................       280,478          2.8            2.4
S. Nicholas Stiso(8)......................................        81,582            *              *
Charles W. Patrick(8).....................................        73,030            *              *
All directors and executive officers as a group (12
  persons)(8)(10).........................................     5,120,557         50.5%          42.2%
</TABLE>
 
- ---------------
  *  Less than 1%.
 
 (1) To the Company's knowledge, the persons named in the table have sole voting
     and investment power with respect to all shares of Common Stock shown as
     beneficially owned by them, subject to community property laws where
     applicable and the information contained in the footnotes to this table.
 
 (2) Includes (i) 704,225 shares held by Medicus Venture Partners 1989, (ii)
     520,833 shares held by Medicus Venture Partners 1990, (iii) 333,334 shares
     held by Medicus Venture Partners 1991 and
 
                                       51
<PAGE>   55
 
     (iv) 104,167 shares held by Medicus Venture Partners 1992 (collectively,
     the "Medicus Entities"). A limited partnership affiliated with The Hillman
     Company and a limited partnership with general partners Frederick J.
     Dotzler and John Reher are each general partners of each of the Medicus
     Entities, and therefore may be deemed to be the beneficial owner of these
     shares because they share the power to vote and dispose of these shares.
     The Hillman Company is controlled by Henry L. Hillman, Elsie Hilliard
     Hillman and C.G. Grefenstette, trustees (the "HLH Trustees") of the Henry
     L. Hillman Trust U/A dated November 18, 1985 (the "HLH Trust"), which three
     trustees share the power to vote and dispose of shares representing a
     majority of the voting shares of The Hillman Company. Does not include
     50,409 shares held directly by the HLH Trust or 134,423 shares held
     directly by Wilmington Interstate Corporation, an indirect, wholly-owned
     subsidiary of The Hillman Company. Also does not include an aggregate of
     20,164 shares held by four irrevocable trusts for the benefit of members of
     the Hillman family (the "Family Trusts"), as to which shares the HLH
     Trustees (other than Mr. Grefenstette) disclaim beneficial ownership. C.G.
     Grefenstette and Thomas G. Bigley are trustees of the Family Trusts and
     share voting and dispositive power over the assets of the Family Trusts.
 
 (3) Includes 56,044 shares held by KPCB Zaibatsu Fund I.
 
 (4) Includes 1,005,869 shares held by Euclid Partners III, L.P. Mr. Reidy is a
     general partner of the general partner of Euclid Partners III, L.P., and as
     such, may be deemed to share voting and investment power with respect to
     such shares. Mr. Reidy disclaims beneficial ownership of such shares except
     to the extent of his pecuniary interest in such partnership.
 
 (5) Includes 635,417 shares held by Kingsbury Capital Partners I, L.P. Mr.
     Wollaeger is a general partner of the general partner of Kingsbury Capital
     Partners I, L.P., and as such, may be deemed to share voting and investment
     power with respect the shares held by the partnership. Mr. Wollaeger
     disclaims beneficial ownership of such shares, except to the extent of his
     pecuniary interest in such partnership. Includes 6,722 shares held in a
     trust for the benefit of Mr. Wollaeger's family as to which Mr. Wollaeger
     has shared voting and investment power.
 
 (6) Includes 329,167 shares held by Domain Partners, L.P. Dr. Treu is a general
     partner of the general partner of Domain Partners, L.P., and as such, may
     be deemed to share voting and investment power with respect to such shares.
     Dr. Treu disclaims beneficial ownership except to the extent of his
     pecuniary interest in such partnership. Excludes 429,167 shares
     beneficially held by Biotechnology Investments Ltd. ("BIL"). Dr. Treu is a
     general partner of Domain Associates, the United States venture capital
     advisor to BIL pursuant to a contractual arrangement. Domain Associates has
     no voting or investment power over BIL. Dr. Treu disclaims beneficial
     ownership of the shares held by BIL.
 
 (7) Includes 297,927 shares held in a trust for the benefit of Mr. Greene's
     family as to which Mr. Greene has shared voting and investment power.
 
 (8) Includes shares which may be acquired pursuant to the exercise of options
     within 60 days of December 1, 1996 as follows: Mr. Blickenstaff, 61,565,
     Dr. Valkirs, 54,678, Dr. Buechler, 65,644, Dr. Stiso, 14,744, Mr. Patrick,
     44,696 and all directors and executive officers as a group (12 persons),
     263,105.
 
 (9) Includes 235,834 shares held of record by the Valkirs Family Trust.
 
(10) Includes shares held by entities referenced in footnotes 2, 3, 5, 6, 7 and
     8 which are affiliated with certain directors, except for shares excluded
     in footnote 6.
 
                                       52
<PAGE>   56
 
                          DESCRIPTION OF CAPITAL STOCK
 
     Upon the closing of this offering, the authorized capital stock of the
Company, after giving effect to the conversion of all outstanding Preferred
Stock into Common Stock, and the amendment of the Company's Certificate of
Incorporation, will consist of 25,000,000 shares of Common Stock, $.01 par
value, and 5,000,000 shares of Preferred Stock, $.01 par value.
 
COMMON STOCK
 
     As of November 30, 1996 there were 9,885,168 shares of Common Stock
outstanding held by approximately 165 stockholders of record. Such figures
assume the conversion of each outstanding share of Preferred Stock and the
conversion of convertible debt issued to Sandoz (at the assumed offering price
of $12.00 per share) upon the closing of this offering.
 
     The holders of Common Stock are entitled to one vote for each share held of
record on all matters submitted to a vote of the stockholders. Subject to
preferences that may be applicable to any then outstanding Preferred Stock,
holders of Common Stock are entitled to receive ratably such dividends, if any,
as may be declared by the Board of Directors out of funds legally available
therefor. See "Dividend Policy." In the event of a liquidation, dissolution or
winding up of the Company, holders of the Common Stock and the Preferred Stock
are entitled to share ratably on an as-converted basis in all assets remaining
after payment of liabilities and the liquidation preference of any then
outstanding Preferred Stock. The Common Stock has no preemptive or conversion
rights or other subscription rights and there are no redemptive or sinking funds
provisions applicable to the Common Stock. All outstanding shares of Common
Stock are, and the Common Stock to be outstanding upon completion of this
offering will be, fully paid and nonassessable.
 
PREFERRED STOCK
 
     Upon the closing of this offering, all outstanding shares of Preferred
Stock will be converted into Common Stock. See Note 7 of Notes to Financial
Statements for a description of the currently outstanding Preferred Stock.
Following the conversion, the Company's Certificate of Incorporation will be
restated to delete all references to the prior series of Preferred Stock, and
5,000,000 shares of undesignated Preferred Stock will be authorized. The Board
of Directors has the authority, without further action by the stockholders, to
issue from time to time the Preferred Stock in one or more series and to fix the
number of shares, designations, preferences, powers, and relative,
participating, optional or other special rights and the qualifications or
restrictions thereof. The preferences, powers, rights and restrictions of
different series of Preferred Stock may differ with respect to dividend rates,
amounts payable on liquidation, voting rights, conversion rights, redemption
provisions, sinking fund provisions, and purchase funds and other matters. The
issuance of Preferred Stock could decrease the amount of earnings and assets
available for distribution to holders of Common Stock or affect adversely the
rights and powers, including voting rights, of the holders of Common Stock, and
may have the effect of delaying, deferring or preventing a change in control of
the Company. The Company has no present plan to issue any shares of Preferred
Stock.
 
REGISTRATION RIGHTS
 
     After this offering, the holders of 6,870,513 shares of Common Stock issued
upon conversion of the Company's Series A Preferred Stock, Series B Preferred
Stock, Series C Preferred Stock and Series D Preferred Stock (collectively,
"Registrable Shares") or their permitted transferees, are entitled to certain
rights with respect to the registration of such shares under the Securities Act
of 1933, as amended (the "Securities Act"). If the Company proposes to register
any of its securities under the Securities Act, either for its own account or
for the account of other security holders, holders of Registrable Shares are
entitled to notice of such registration and are entitled to include Registrable
Shares therein, provided, among other conditions, that the underwriters of any
such offering have the right to limit the number of shares included in such
registration. Holders of the 1,458,334 shares of Common Stock issued upon
conversion of the Company's Series E Preferred Stock and holders of shares of
Common Stock issued upon conversion of the convertible debt issued to Sandoz are
entitled to similar "piggyback" rights, on no more than two occasions,
commencing
 
                                       53
<PAGE>   57
 
two years after the effective date of this offering. In addition, commencing 180
days after the effective date of this offering, holders of at least 30% of the
Registrable Shares may require the Company to prepare and file a registration
statement under the Securities Act, at the Company's expense covering at least
30% of the shares entitled to registration rights and with an offering price
(net of underwriting discounts and commissions) of more than $7,500,000, and the
Company is required to use its best efforts to effect such registration, subject
to certain conditions and limitations. The Company is not obligated to effect
more than two of these stockholder-initiated registrations. Further, holders of
Registrable Shares may require the Company to file additional registration
statements on Form S-3, subject to certain conditions and limitations.
 
DELAWARE ANTI-TAKEOVER LAW AND CERTAIN CHARTER PROVISIONS
 
     The Company is subject to the provisions of Section 203 of the Delaware
Law, an anti-takeover law. In general, the statute prohibits a publicly held
Delaware corporation from engaging in a business combination with an "interested
stockholder" for a period of three years after the date of the transaction in
which the person became an interested stockholder, unless the business
combination is approved in a prescribed manner. A "business combination"
includes a merger, asset sale or other transaction resulting in financial
benefit to the stockholder. An "interested stockholder" is a person who,
together with affiliates and associates, owns (or within three years prior, did
own) 15% or more of the corporation's voting stock.
 
     Upon the closing of this offering, the Company's Restated Certification of
Incorporation will be amended to require that any action permitted to be taken
by stockholders of the Company must be effected at a duly-called annual or
special meeting of stockholders and will not be able to be effected by a consent
in writing. The Board of Directors will be composed of a classified board where
only one-third of the directors are eligible for election in any given year. The
Company's Restated Certificate of Incorporation will also be amended to require
the approval of at least two-thirds of the total number of authorized directors
in order to adopt, amend or repeal the Company's Bylaws. In addition, the
Company's Restated Certificate of Incorporation will similarly be amended to
permit the stockholders to adopt, amend or repeal the Company's Bylaws only upon
the affirmative vote of the holders of at least two-thirds of the voting power
of all then outstanding shares of stock entitled to vote. Lastly, the foregoing
provisions of the Restated Certificate of Incorporation and certain other
provisions pertaining to the limitation of liability and indemnification of
directors will be able to be amended or repealed only with the affirmative vote
of the holders of at least two-thirds of the voting power of all then
outstanding shares of stock entitled to vote. These provisions may have the
effect to deterring hostile takeovers or delaying changes in control or
management of the Company.
 
     Upon the closing of this offering, the Company's Bylaws will also be
amended to contain certain of the above provisions found in the Company's
Restated Certificate of Incorporation. The Company's Bylaws, as amended (the
"Restated Bylaws"), will not permit stockholders to call a special meeting. In
addition, the Company's Restated Bylaws will establish an advance notice
procedure with regard to the nomination, other than by or at the direction of
the Board of Directors, of candidates for election as directors and with regard
to certain matters to be brought before an annual meeting of stockholders of the
Company. Also, a director will be removable only for cause. In addition, the
Restated Bylaws will provide that the business permitted to be conducted in any
annual meeting or special meeting of stockholders will be limited to business
properly brought before the meeting.
 
TRANSFER AGENT AND REGISTRAR
 
     The transfer agent and registrar for the Common Stock is                .
 
                                       54
<PAGE>   58
 
                        SHARES ELIGIBLE FOR FUTURE SALE
 
     Prior to this offering there has been no public market for the Common Stock
of the Company, and no predictions can be made regarding the effect, if any,
that market sales of shares or the availability of shares for sale will have on
the market price prevailing from time to time. As described below, a limited
number of shares will be available for sale shortly after this offering due to
certain contractual and legal restrictions on resale. Nevertheless, sales of
substantial amounts of Common Stock of the Company in the public market after
the restrictions lapse could adversely affect the prevailing market price.
 
     Upon completion of this offering, the Company will have outstanding
11,885,168 shares of Common Stock. The 2,000,000 shares of Common Stock being
sold hereby will be freely tradable (other than by an "affiliate" of the Company
as such term is defined in the Securities Act) without restriction or
registration under the Securities Act. All remaining shares were issued and sold
by the Company in private transactions ("Restricted Shares") and are eligible
for public sale if registered under the Securities Act or sold in accordance
with Rule 144 or Rule 701 thereunder.
 
     Upon the commencement of this offering, an additional 451,030 shares will
be eligible for immediate sale without restriction under Rule 144(k). In
addition, approximately 192,525 shares will be eligible for immediate sale under
Rule 701, beginning 90 days after the date of this Prospectus. Certain
stockholders, who collectively hold an aggregate of 1,764,796 shares of Common
Stock, have agreed pursuant to certain agreements with the Company that they
will not sell such Common Stock for a period of 120 days from the effective date
of the Registration Statement of which this Prospectus is a part. Following the
expiration of such 120-day lockup period, all such shares will be available for
immediate sale without restriction under Rule 144(k). The Company's directors,
executive officers and certain other stockholders, who collectively hold an
aggregate of 7,384,595 shares of Common Stock, have agreed pursuant to certain
agreements that they will not sell any Common Stock owned by them without the
prior written consent of the Representatives of the Underwriters for a period of
180 days from the effective date of the Registration Statement of which this
Prospectus is a part. Following the expiration of such lockup period, all such
shares will be available for sale in the public market subject to compliance
with Rule 144 or Rule 701, including approximately 2,527,143 shares eligible for
the sale under Rule 144(k). See "Underwriting."
 
     In general, under Rule 144 as currently in effect, beginning 90 days after
the date of this Prospectus, an affiliate of the Company, or a holder of
Restricted Shares who owns beneficially shares that were not acquired from the
Company or an affiliate of the Company within the previous two years, would be
entitled to sell within any three-month period a number of shares that does not
exceed the greater of 1% of the then outstanding shares of Common Stock
(approximately 118,851 shares immediately after this offering, assuming no
exercise of the Underwriters' over-allotment option) or the average weekly
trading volume of the Common Stock during the four calendar weeks preceding the
date on which notice of the sale is filed with the Securities and Exchange
Commission (the "Commission"). Sales under Rule 144 are subject to certain
requirements relating to manner of sale, notice and availability of current
public information about the Company. However, a person (or persons whose shares
are aggregated) who is not deemed to have been an affiliate of the Company at
any time during the 90 days immediately preceding the sale and who owns
beneficially Restricted Shares is entitled to sell such shares under Rule 144(k)
without regard to the limitations described above; provided that at least three
years have elapsed since the later of the date the shares were acquired from the
Company or from an affiliate of the Company. The foregoing is a summary of Rule
144 and is not intended to be a complete description of it.
 
     Subject to certain limitations on the aggregate offering price of a
transaction and other conditions, Rule 701 may be relied upon with respect to
the resale of securities originally purchased from the Company by its employees,
directors, officers, consultants or advisers prior to the closing of this
offering, pursuant to written compensatory benefit plans or written contracts
relating to the compensation of such persons. In addition, the Commission has
indicated that Rule 701 will apply to stock options granted by the Company
before this offering, along with the shares acquired upon exercise of such
options. Securities issued in reliance on Rule 701 are deemed to be Restricted
Shares and, beginning 90 days after the date of this Prospectus (unless subject
to the contractual restrictions described above), may be sold by persons other
than affiliates subject
 
                                       55
<PAGE>   59
 
only to the manner of sale provisions of Rule 144 and by affiliates under Rule
144 without compliance with its two-year minimum holding period requirements.
 
     The Company intends to file a registration statement under the Securities
Act covering approximately 2,215,960 shares of Common Stock reserved for
issuance under the stock plans. Such registration statement is expected to be
filed soon after the date of this Prospectus and will automatically become
effective upon filing. Accordingly, shares registered under such registration
statement will be available for sale in the open market, unless such shares are
subject to vesting restrictions with the Company or the contractual restrictions
described above.
 
     In addition, after this offering, the holders of approximately 6,870,513
shares of Common Stock will be entitled to certain rights to demand that the
Company to register the sale of such shares under the Securities Act. Such
holders and holders of 1,458,334 shares of Common Stock and 92,222 shares issued
upon conversion of convertible debt issued to Sandoz (at the assumed offering
price of $12.00 per share) are also entitled to be included in certain Company
registrations. Registration of such shares under the Securities Act would result
in such shares becoming freely tradable without restriction under the Securities
Act (except for shares purchased by affiliates of the Company) immediately upon
the effectiveness of such registration. See "Description of Capital
Stock -- Registration Rights."
 
                                       56
<PAGE>   60
 
                                  UNDERWRITING
 
     Subject to the terms and conditions set forth in the Underwriting
Agreement, the Underwriters named below (the "Underwriters"), through their
representatives, Cowen & Company and Alex. Brown & Sons Incorporated, have
severally agreed to purchase from the Company the following respective number of
shares at the initial public offering price less the underwriting discounts and
commissions set forth on the cover page of this Prospectus:
 
<TABLE>
<CAPTION>
                                                                             NUMBER
                                       NAME                                 OF SHARES
        ------------------------------------------------------------------  ---------
        <S>                                                                 <C>
        Cowen & Company...................................................
        Alex. Brown & Sons Incorporated...................................
 
                                                                             --------
                  Total...................................................  2,000,000
                                                                             ========
</TABLE>
 
     The Underwriting Agreement provides that the obligations of the
Underwriters are subject to certain conditions precedent, including the absence
of any material adverse change in the Company's business and the receipt of
certain certificates, opinions and letters from the Company and its counsel and
independent auditors. The nature of the Underwriters' obligation is such that
they are committed to purchase all shares of Common Stock offered hereby if any
of such shares are purchased.
 
     The Underwriters propose to offer the shares of Common Stock directly to
the public at the initial public offering price set forth on the cover page of
this Prospectus and to certain dealers at such price less a concession not in
excess of $          per share. The Underwriters may allow and such dealers may
re-allow a concession not in excess of $          per share to certain other
dealers. The Underwriters have informed the Company that they do not intend to
confirm sales to any accounts over which they exercise discretionary authority.
After the initial public offering of the shares, the offering price and other
selling terms may from time to time be varied by the Underwriters.
 
     The Company has granted to the Underwriters an option, exercisable no later
than 30 days after the date of this Prospectus, to purchase up to 300,000
additional shares of Common Stock at the initial public offering price, less the
underwriting discounts and commissions, set forth on the cover page of this
Prospectus, to cover over-allotments, if any. If the Underwriters exercise such
over-allotment option, the Underwriters have severally agreed, subject to
certain conditions, to purchase approximately the same percentage thereof that
the number of shares of Common Stock to be purchased by each of them shown in
the foregoing table bears to the total number of shares of Common Stock offered
hereby. The Underwriters may exercise such option only to cover over-allotments
made in connection with the sale of shares of Common Stock offered hereby.
 
     The Company's officers and directors and certain other stockholders of the
Company holding in the aggregate approximately 7,384,595 shares of Common Stock
have agreed that they will not, without the prior written consent of Cowen &
Company, offer, sell or otherwise dispose of any shares of Common Stock,
options, rights or warrants to acquire shares of Common Stock, or securities
exchangeable for or convertible into shares of Common Stock owned by them during
the 180-day period commencing on the effective date of the Registration
Statement. Certain other stockholders of the Company holding in the aggregate
approximately 1,764,796 shares of Common Stock have agreed that they will not
sell or otherwise transfer or dispose of any such shares of Common Stock owned
by them during the 120-day period commencing on the effective date of the
Registration Statement. In addition, the Company has agreed that it will not,
without the prior written consent of Cowen & Company, offer, sell or otherwise
dispose of any shares of Common Stock options, rights or warrants to acquire
shares of Common Stock, or securities exchangeable for or convertible into
shares of Common Stock during such 180-day period except in certain limited
circumstances.
 
                                       57
<PAGE>   61
 
     The Company has agreed to indemnify the Underwriters against certain
liabilities, including liabilities under the Securities Act, and to contribute
to payments the Underwriters may be required to make in respect thereof.
 
     Prior to this offering, there has been no public market for the Common
Stock. The initial public offering price for the Common Stock will be determined
by negotiation among the Company and the Representatives. Among the factors
considered in determining the initial public offering price will be prevailing
market and economic conditions, market valuations of other companies engaged in
activities similar to the Company, estimates of the business potential and
prospects of the Company, the present state of the Company's business
operations, the Company's management and other factors deemed relevant. The
estimated initial public offering price range set forth on the cover of this
Prospectus is subject to change as a result of market conditions and other
factors.
 
                                 LEGAL MATTERS
 
     Certain legal matters with respect to the validity of the Common Stock
offered hereby will be passed upon for the Company by Pillsbury Madison & Sutro
LLP, San Francisco, California. A member of Pillsbury Madison & Sutro LLP owns
18,360 shares of Common Stock. Cooley Godward LLP, San Diego, California, is
acting as counsel for the Underwriters in connection with certain legal matters
relating to the sale of the Common Stock offered hereby.
 
                                    EXPERTS
 
     The financial statements of Biosite at December 31, 1994 and 1995, and
September 30, 1996 and for each of the three years in the period ended December
31, 1995 and the nine months ending September 30, 1996, appearing in this
Prospectus and Registration Statement have been audited by Ernst & Young LLP,
independent auditors, as set forth in their report thereon appearing elsewhere
herein, and are included in reliance upon such report given upon the authority
of such firm as experts in accounting and auditing.
 
                             ADDITIONAL INFORMATION
 
     The Company has filed with the Securities and Exchange Commission (the
"Commission") a Registration Statement under the Securities Act with respect to
the Common Stock offered hereby. This Prospectus does not contain all of the
information set forth in the Registration Statement and the exhibits and
schedules thereto. For further information with respect to the Company and the
Common Stock offered hereby, reference is hereby made to such Registration
Statement, exhibits and schedules. Statements contained in this Prospectus
regarding the contents of any contract or other document are not necessarily
complete; with respect to each such contract or document filed as an exhibit to
the Registration Statement, reference is made to the exhibit for a more complete
description of the matter involved, and each such statement shall be deemed
qualified in its entirety by such reference. A copy of the Registration
Statement, including the exhibits and schedules thereto, may be inspected
without charge at the principal office of the Commission, 450 Fifth Street,
N.W., Washington, D.C. 20549, and copies of such material may be obtained from
such office upon payment of the fees prescribed by the Commission. In addition,
the Commission maintains a World Wide Web site on the Internet at
http://www.sec.gov that contains reports, proxy and information statements and
other information regarding registrants that file electronically with the
Commission.
 
     The Company intends to furnish its stockholders with annual reports
containing financial statements audited by independent certified public
accountants and quarterly reports containing unaudited financial information for
the first three quarters of each fiscal year.
 
                                       58
<PAGE>   62
 
                         INDEX TO FINANCIAL STATEMENTS
 
<TABLE>
<CAPTION>
                                                                                        PAGE
                                                                                        ----
<S>                                                                                     <C>
Report of Ernst & Young LLP, Independent Auditors.....................................  F-2
Balance Sheets at December 31, 1994 and 1995 and September 30, 1996...................  F-3
Statements of Income for each of the three years in the period ended December 31, 1995
  and the nine months ended September 30, 1995 (unaudited) and 1996...................  F-4
Statements of Stockholders' Equity for each of the three years in the period ended
  December 31, 1995 and the nine months ended September 30, 1996......................  F-5
Statements of Cash Flows for each of the three years in the period ended December 31,
  1995 and the nine months ended September 30, 1995 (unaudited) and 1996..............  F-6
Notes to Financial Statements.........................................................  F-7
</TABLE>
 
                                       F-1
<PAGE>   63
 
               REPORT OF ERNST & YOUNG LLP, INDEPENDENT AUDITORS
 
The Board of Directors and Stockholders
Biosite Diagnostics Incorporated
 
     We have audited the accompanying balance sheets of Biosite Diagnostics
Incorporated as of December 31, 1994 and 1995 and September 30, 1996, and the
related statements of income, stockholders' equity and cash flows for each of
the three years in the period ended December 31, 1995 and the nine months ended
September 30, 1996. These financial statements are the responsibility of the
Company's management. Our responsibility is to express an opinion on these
financial statements based on our audits.
 
     We conducted our audits in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the financial statements are free of material
misstatement. An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements. An audit also includes
assessing the accounting principles used and significant estimates made by
management, as well as evaluating the overall financial statement presentation.
We believe that our audits provide a reasonable basis for our opinion.
 
     In our opinion, the financial statements referred to above present fairly,
in all material respects, the financial position of Biosite Diagnostics
Incorporated at December 31, 1994 and 1995 and September 30, 1996, and the
results of its operations and its cash flows for each of the three years in the
period ended December 31, 1995 and the nine months ended September 30, 1996 in
conformity with generally accepted accounting principles.
 
                                          ERNST & YOUNG LLP
 
San Diego, California
November 12, 1996, except for Note 7,
as to which the date is December 5, 1996
 
                                       F-2
<PAGE>   64
 
                        BIOSITE DIAGNOSTICS INCORPORATED
 
                                 BALANCE SHEETS
 
<TABLE>
<CAPTION>
                                                                                                            PRO FORMA
                                                             DECEMBER 31,                                LIABILITIES AND
                                                      --------------------------     SEPTEMBER 30,        STOCKHOLDERS'
                                                          1994          1995              1996              EQUITY AT
                                                      ------------   -----------   ------------------     SEPTEMBER 30,
                                                                                                               1996
                                                                                                        ------------------
                                                                                                           (UNAUDITED)
<S>                                                   <C>            <C>           <C>                  <C>
ASSETS
Current assets:
  Cash and cash equivalents.........................  $    392,433   $ 2,276,403      $  1,410,620
  Marketable securities, available-for-sale.........     5,523,160    11,702,607         8,758,654
  Accounts receivable...............................     3,175,899     3,801,755         4,153,326
  Receivable from stockholder.......................       471,000       141,000           620,000
  Inventory.........................................     1,137,830     1,689,124         1,709,016
  Deferred income taxes.............................            --     1,073,000         1,279,000
  Prepaid expenses and other current assets.........       353,302       413,917           589,675
                                                      ------------   -----------       -----------
        Total current assets........................    11,053,624    21,097,806        18,520,291
Property, equipment and leasehold improvements,
  net...............................................     1,859,573     3,599,969         3,941,520
Deferred income taxes...............................            --       754,000           884,000
Patents and license rights, net.....................       472,060     1,759,809         4,458,074
Deposits and other assets...........................       978,347       723,349         1,164,199
                                                      ------------   -----------       -----------
                                                      $ 14,363,604   $27,934,933      $ 28,968,084
                                                      ============   ===========       ===========
LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities:
  Accounts payable..................................  $    608,085   $   776,393      $  1,345,799         $  1,345,799
  Accrued salaries and other........................       591,393       912,259           898,320              818,320
  Accrued contract payable..........................       423,807     1,053,052         1,281,276            1,281,276
  Accrued settlement of patent matters..............            --     2,200,000                --                   --
  Contract advance..................................       500,000            --                --                   --
  Deferred revenue from stockholder.................       316,330       615,282                --                   --
  Current portion of long-term obligations..........       640,453     1,112,712         1,027,579            1,027,579
                                                      ------------   -----------       -----------          -----------
        Total current liabilities...................     3,080,068     6,669,698         4,552,974            4,472,974
Long-term obligations...............................       771,563     2,739,473         3,233,643            2,233,643
Commitments and contingencies
Stockholders' equity:
  Convertible preferred stock, $.01 par value,
    8,328,847 shares authorized (5,000,000 pro
    forma); 8,328,847 shares issued and outstanding
    (no shares pro forma), liquidation value,
    $21,662,030.....................................        83,288        83,288            83,288                   --
  Common stock, $.01 par value, 12,000,000 shares
    authorized (25,000,000 shares pro forma);
    1,154,066, 1,369,595, and 1,460,093 shares
    issued and outstanding at December 31, 1994,
    1995, and September 30, 1996, respectively
    (9,881,162 shares pro forma)....................        11,541        13,696            14,601               98,812
  Additional paid-in capital........................    21,483,800    21,570,516        21,686,698           22,792,442
  Unrealized net gain (loss) on marketable
    securities, net of related tax effect of $11,058
    and $(6,754) at December 31, 1995 and September
    30, 1996, respectively..........................            --        16,588           (10,131)             (10,131)
  Deferred compensation.............................            --            --           (48,023)             (48,023)
  Accumulated deficit...............................   (11,066,656)   (3,158,326)         (544,966)            (571,633)
                                                      ------------   -----------       -----------          -----------
        Total stockholders' equity..................    10,511,973    18,525,762        21,181,467           22,261,467
                                                      ------------   -----------       -----------          -----------
                                                      $ 14,363,604   $27,934,933      $ 28,968,084         $ 28,968,084
                                                      ============   ===========       ===========          ===========
</TABLE>
 
                            See accompanying notes.
 
                                       F-3
<PAGE>   65
 
                        BIOSITE DIAGNOSTICS INCORPORATED
 
                              STATEMENTS OF INCOME
 
<TABLE>
<CAPTION>
                                                                                NINE MONTHS ENDED
                                         YEARS ENDED DECEMBER 31,                 SEPTEMBER 30,
                                  ---------------------------------------   -------------------------
                                     1993          1994          1995                        1996
                                  -----------   -----------   -----------      1995       -----------
                                                                            -----------
                                                                            (UNAUDITED)
<S>                               <C>           <C>           <C>           <C>           <C>
Net sales.......................  $ 9,866,297   $16,319,752   $25,146,540   $18,235,729   $20,224,976
Cost of sales...................    3,268,030     4,415,344     5,648,786     3,781,316     4,317,648
                                  -----------   -----------   -----------   -----------   -----------
Gross profit....................    6,598,267    11,904,408    19,497,754    14,454,413    15,907,328
Operating expenses:
  Research and development......    2,796,248     3,835,649     6,553,454     4,601,467     6,515,097
  Sales and marketing...........    3,390,201     3,851,933     4,943,392     3,625,541     3,894,885
  General and administrative....    1,450,755     2,109,150     2,190,246     1,577,951     2,221,599
                                  -----------   -----------   -----------   -----------   -----------
                                    7,637,204     9,796,732    13,687,092     9,804,959    12,631,581
                                  -----------   -----------   -----------   -----------   -----------
Operating income (loss).........   (1,038,937)    2,107,676     5,810,662     4,649,454     3,275,747
Other income (expense):
  Interest income...............      217,610       238,990       605,002       380,851       579,073
  Contract revenue-related
     party......................           --       343,678       561,048       388,261       856,880
  Contract revenue..............           --            --       300,000       300,000            --
  Licensing and other income....      395,201        66,207       181,683       184,057         5,942
  Settlement of patent
     matters....................           --      (338,004)   (1,217,065)     (743,173)   (2,368,282)
                                  -----------   -----------   -----------   -----------   -----------
                                      612,811       310,871       430,668       509,996      (926,387)
Income (loss) before benefit
  (provision) for income
  taxes.........................     (426,126)    2,418,547     6,241,330     5,159,450     2,349,360
Benefit (provision) for income
  taxes.........................           --       (63,000)    1,667,000      (132,000)      264,000
                                  -----------   -----------   -----------   -----------   -----------
Net income (loss)...............  $  (426,126)  $ 2,355,547   $ 7,908,330   $ 5,027,450   $ 2,613,360
                                  ===========   ===========   ===========   ===========   ===========
Net income (loss) per share.....  $      (.04)  $       .22   $       .74   $       .47   $       .24
                                  ===========   ===========   ===========   ===========   ===========
Shares used in calculating per
  share amounts.................   10,098,000    10,553,000    10,766,000    10,721,000    10,832,000
                                  ===========   ===========   ===========   ===========   ===========
</TABLE>
 
                            See accompanying notes.
 
                                       F-4
<PAGE>   66
 
                        BIOSITE DIAGNOSTICS INCORPORATED
 
                       STATEMENTS OF STOCKHOLDERS' EQUITY
 
<TABLE>
<CAPTION>
                                                                                                         UNREALIZED
                                         PREFERRED STOCK            COMMON STOCK         ADDITIONAL    NET GAIN (LOSS)
                                       -------------------     ---------------------      PAID-IN      ON MARKETABLE  
                                         SHARES      AMOUNT      SHARES        AMOUNT     CAPITAL       SECURITIES    
                                       ---------    -------    ---------      -------   -----------   --------------- 
<S>                                  <C>          <C>         <C>           <C>       <C>             <C>             
Balance at January  1, 1993.......     8,328,847    $83,288     1,138,069    $11,381    $21,474,142      $      --    
  Issuance of common stock........            --         --        14,298        143          8,146             --    
  Net loss........................            --         --            --         --             --             --    
                                      ----------    -------    ----------    -------    -----------      ---------    

Balance at December 31, 1993......     8,328,847     83,288     1,152,367     11,524     21,482,288             --    
  Issuance of common stock........            --         --         1,699         17          1,512             --    
  Net income......................            --         --            --         --             --             --    
                                      ----------    -------    ----------    -------    -----------      ---------    

Balance at December 31,  1994.....     8,328,847     83,288     1,154,066     11,541     21,483,800             --    
  Issuance of common stock........            --         --       215,529      2,155         86,716             --    
  Change in unrealized net gain
    (loss) on marketable
    securities, net of income
    taxes of $11,058..............            --         --            --         --             --         16,588    
  Net income......................            --         --            --         --             --             --    
                                      ----------    -------    ----------    -------    -----------      ---------    

Balance at December 31, 1995......     8,328,847     83,288     1,369,595     13,696     21,570,516         16,588    
  Issuance of common stock........            --         --        90,498        905         67,397             --    
  Change in unrealized net gain
    (loss) on marketable
    securities, net of income
    taxes of $6,754...............            --         --            --         --             --        (26,719)   
  Deferred compensation related
    to issuance of stock options..            --         --            --         --         48,785             --    
  Amortization of deferred
    compensation..................            --         --            --         --             --             --    
  Net income......................            --         --            --         --             --             --    
                                      ----------    -------    ----------    -------    -----------      ---------    

Balance at September 30, 1996.....     8,328,847    $83,288     1,460,093    $14,601    $21,686,698      $ (10,131)   
                                      ==========    =======    ==========    =======    ===========      =========                  

<CAPTION> 



                                                                            TOTAL
                                            DEFERRED     ACCUMULATED   STOCKHOLDERS'
                                          COMPENSATION     DEFICIT        EQUITY
                                          ------------   ------------  -------------
<S>                                       <C>            <C>            <C>
Balance at January  1, 1993.......         $       --    $(12,996,077)   $ 8,572,734
  Issuance of common stock........                 --             --           8,289
  Net loss........................                 --       (426,126 )      (426,126)
                                           ----------    -------------   -----------

Balance at December 31, 1993......                 --    (13,422,203 )     8,154,897
  Issuance of common stock........                 --             --           1,529
  Net income......................                 --      2,355,547       2,355,547
                                           ----------    -------------   -----------

Balance at December 31,  1994.....                 --    (11,066,656 )    10,511,973
  Issuance of common stock........                 --             --          88,871
  Change in unrealized net gain
    (loss) on marketable
    securities, net of income
    taxes of $11,058..............                 --             --          16,588
  Net income......................                 --      7,908,330       7,908,330
                                           ----------    -------------   -----------

Balance at December 31, 1995......                 --     (3,158,326 )    18,525,762
  Issuance of common stock........                 --             --          68,302
  Change in unrealized net gain
    (loss) on marketable
    securities, net of income
    taxes of $6,754...............                 --             --         (26,719)
  Deferred compensation related
    to issuance of stock options..            (48,785)            --              --
  Amortization of deferred
    compensation..................                762             --             762
  Net income......................                 --      2,613,360       2,613,360
                                           ----------    -------------   -----------

Balance at September 30, 1996.....         $  (48,023)   $  (544,966 )   $21,181,467
                                           ==========    =============   ===========

</TABLE>

                            See accompanying notes.

                                      F-5
<PAGE>   67
 
                        BIOSITE DIAGNOSTICS INCORPORATED
 
                            STATEMENTS OF CASH FLOWS
 
<TABLE>
<CAPTION>
                                                                                                    NINE MONTHS ENDED
                                                        YEARS ENDED DECEMBER 31,                      SEPTEMBER 30,
                                               -------------------------------------------     ----------------------------
                                                  1993            1994            1995            1995             1996
                                               -----------     -----------     -----------     -----------     ------------
                                                                                               (UNAUDITED)
<S>                                            <C>             <C>             <C>             <C>             <C>
OPERATING ACTIVITIES
Net income (loss)............................  $  (426,126)    $ 2,355,547     $ 7,908,330     $ 5,027,450     $  2,613,360
Adjustments to reconcile net income (loss) to
  net cash provided by (used in) operating
  activities:
  Depreciation and amortization..............      524,984         544,332       1,787,386         658,468        1,861,614
  Amortization of deferred compensation......           --              --              --              --              762
  Deferred income taxes......................           --              --      (1,827,000)             --         (336,000)
  Changes in operating assets and
    liabilities:
    Accounts receivable......................     (535,453)     (1,712,708)       (625,856)       (644,571)        (351,571)
    Receivable from stockholder..............      (59,000)       (412,000)        330,000         211,660         (479,000)
    Inventory................................     (161,701)       (402,193)       (551,294)       (526,981)         (19,892)
    Prepaid expenses and other current
      assets.................................     (340,948)        147,309         (71,673)        (19,764)        (157,946)
    Accounts payable.........................      216,486          50,979         168,308         (31,849)         569,406
    Accrued liabilities......................      282,026         487,385         950,111         853,692       (1,985,715)
    Contract advance.........................           --         500,000        (500,000)       (500,000)              --
    Deferred revenue from a stockholder......           --         316,330         298,952         471,739         (615,282)
                                               -----------     -----------     -----------     -----------     ------------
Net cash provided by (used in) operating
  activities.................................     (499,732)      1,874,981       7,867,264       5,499,844        1,099,736
INVESTING ACTIVITIES
Proceeds from sales and maturities of
  marketable securities......................    4,373,730       4,531,676       8,189,035       6,041,413       11,605,384
Purchase of marketable securities............   (7,731,313)     (5,712,424)    (14,340,836)     (8,968,435)      (8,705,962)
Purchase of property, equipment and leasehold
  improvements...............................     (142,972)     (1,063,418)     (2,682,315)     (2,061,707)      (1,378,923)
Patents, license rights, deposits and other
  assets.....................................     (155,232)       (409,423)        321,782         254,752       (3,963,357)
                                               -----------     -----------     -----------     -----------     ------------
Net cash used in investing activities........   (3,655,787)     (2,653,589)     (8,512,334)     (4,733,977)      (2,442,858)
FINANCING ACTIVITIES
Proceeds from issuance of convertible
  debentures.................................           --              --       1,000,000       1,000,000               --
Proceeds from issuance of equipment loans
  payable....................................           --         919,988       2,290,561       1,832,653        1,364,137
Principal payments under long-term
  obligations................................     (516,684)       (536,769)       (850,392)       (596,714)        (955,100)
Proceeds from issuance of stock, net.........        8,289           1,529          88,871          69,170           68,302
                                               -----------     -----------     -----------     -----------     ------------
Net cash provided by (used in) financing
  activities.................................     (508,395)        384,748       2,529,040       2,305,109          477,339
                                               -----------     -----------     -----------     -----------     ------------
Increase (decrease) in cash and cash
  equivalents................................   (4,663,914)       (393,860)      1,883,970       3,070,976         (865,783)
Cash and cash equivalents at beginning of
  period.....................................    5,450,207         786,293         392,433         392,433        2,276,403
                                               -----------     -----------     -----------     -----------     ------------
Cash and cash equivalents at end of period...  $   786,293     $   392,433     $ 2,276,403     $ 3,463,409     $  1,410,620
                                                ==========      ==========      ==========      ==========      ===========
SUPPLEMENTAL DISCLOSURES OF CASH FLOW
  INFORMATION:
  Interest paid..............................  $   139,022     $   172,512     $   208,623     $   145,593     $    212,329
                                                ==========      ==========      ==========      ==========      ===========
  Income taxes paid..........................  $       987     $    38,800     $   171,243     $   176,412     $    103,874
                                                ==========      ==========      ==========      ==========      ===========
SUPPLEMENTAL SCHEDULE OF NON-CASH INVESTING
  AND FINANCING ACTIVITIES:
  Accrued liability for license rights
    acquired.................................  $        --     $        --     $ 2,200,000     $        --     $         --
                                                ==========      ==========      ==========      ==========      ===========
  Capital lease obligations entered into for
    equipment................................  $   417,260     $        --     $        --     $        --     $         --
                                                ==========      ==========      ==========      ==========      ===========
</TABLE>
 
                            See accompanying notes.
 
                                       F-6
<PAGE>   68
 
                        BIOSITE DIAGNOSTICS INCORPORATED
 
                         NOTES TO FINANCIAL STATEMENTS
    (INFORMATION FOR THE NINE MONTHS ENDED SEPTEMBER 30, 1995 IS UNAUDITED)
 
1. ORGANIZATION AND SUMMARY OF SIGNIFICANT POLICIES
 
ORGANIZATION AND BUSINESS ACTIVITY
 
     Biosite Diagnostics Incorporated (the "Company") was established in 1988.
The Company has been primarily involved in the research, development,
manufacturing and marketing of point-of-care assays. The Company's first product
is Triage DOA, a urine test for the rapid detection of common drugs of abuse.
The Company began commercial sales of Triage DOA in February 1992 and currently
markets the product worldwide primarily through distributors supported by a
small direct sales force. The principal markets of the Company are hospital
laboratories and emergency departments. The Company is also engaged in research
and development of several additional point-of-care diagnostic products in the
microbiology, cardiology and therapeutic drug monitoring fields.
 
REVENUE RECOGNITION AND SIGNIFICANT CUSTOMERS
 
     The Company recognizes sales upon shipment. The Company's U.S. distributor
accounted for 87%, 85% and 88% of the product sales in 1993, 1994 and 1995,
respectively, and 88% and 80% for the nine months ended September 30, 1995 and
1996, respectively.
 
     The Company's agreement with its U.S. distributor contains sales milestones
based on the U.S. distributor's sales performance that allows the Company, if
the milestones are not met by the U.S. distributor, to terminate the agreement,
collect a penalty payment based on sales levels actually achieved in 1996, and
appoint a new distributor or sell the product directly in the U.S. medical
market.
 
     Export sales to international customers amounted to $943,000, $1,457,000
and $1,944,000 in 1993, 1994 and 1995, respectively, and $1,362,000 and
$2,248,000 for the nine months ended September 30, 1995 and 1996, respectively.
Sales to a stockholder amounted to approximately $838,000, $1,242,000 and
$1,345,000 in 1993, 1994 and 1995, respectively, and $978,000 and $1,652,000 for
the nine months ended September 30, 1995 and 1996, respectively. Accounts
receivable from a stockholder were approximately $471,000, $141,000, and
$378,000 at December 31, 1994 and 1995, and September 30, 1996, respectively.
 
CASH AND CASH EQUIVALENTS
 
     Cash and cash equivalents consist of cash and highly liquid debt
investments with maturities of 90 days or less when purchased.
 
MARKETABLE SECURITIES
 
     Effective January 1, 1994 the Company adopted Financial Accounting
Standards Board ("FASB") Statement No. 115, "Accounting for Certain Investments
in Debt and Equity Securities", which requires that investments in equity
securities that have readily determinable fair values and investments in debt
securities be classified in three categories: held-to-maturity, trading and
available-for-sale. Based on the nature of the assets held by the Company and
management's investment strategy, the Company's investments have been classified
as available-for-sale. Management determines the appropriate classification of
debt securities at the time of purchase and reevaluates such designation as of
each balance sheet date.
 
     Securities classified as available-for-sale are carried at estimated fair
value, as determined by quoted market prices, with unrealized gains and losses,
net of tax, reported in a separate component of stockholders' equity. At
September 30, 1996, the Company had no investments that were classified as
trading or held-to-maturity as defined by the Statement.
 
     The amortized cost of debt securities classified as available-for-sale is
adjusted for amortization of premiums and accretion of discounts to maturity.
Such amortization is included in interest income. Realized
 
                                       F-7
<PAGE>   69
 
                        BIOSITE DIAGNOSTICS INCORPORATED
 
                  NOTES TO FINANCIAL STATEMENTS -- (CONTINUED)
    (INFORMATION FOR THE NINE MONTHS ENDED SEPTEMBER 30, 1995 IS UNAUDITED)
 
gains and losses are included in interest income. The cost of securities sold is
based on the specific identification method. Interest on securities classified
as available-for-sale is included in interest income.
 
INVENTORY
 
     Inventories are carried at the lower of cost (first-in, first-out) or
market.
 
PROPERTY, EQUIPMENT AND LEASEHOLD IMPROVEMENTS
 
     Property, equipment and leasehold improvements are stated at cost.
 
DEPRECIATION AND AMORTIZATION
 
     Depreciation of property and equipment is computed using the straight-line
method over five years. Amortization of leased equipment is computed using the
straight-line method over the estimated useful lives of the assets or the lease
term. Amortization of leasehold improvements is computed using the straight-line
method over the shorter of the estimated useful lives of the assets or the
remaining lease term.
 
PATENTS AND LICENSE RIGHTS
 
     The Company has been issued patents covering its threshold immunoassay and
other related technologies. Capitalized patent costs associated with issued
patents are amortized over five to seventeen years. License rights related to
products for sale are amortized to cost of sales over the life of the license
using a systematic method based on the estimated revenues generated from
products during such license period.
 
STOCK OPTIONS
 
     In October 1995, the FASB issued Statement of Financial Accounting
Standards ("SFAS") No. 123, "Accounting for Stock-Based Compensation," effective
for fiscal years beginning after December 15, 1995. SFAS No. 123 establishes the
fair value-based method of accounting for stock-based compensation arrangements,
under which compensation is determined using the fair value of the stock option
at the grant date and the number of options vested, and is recognized over the
periods in which the related services are rendered. The Company has made the
decision to continue with the current intrinsic value-based method, as allowed
by SFAS No. 123, and will be required to disclose the pro forma effect of
adopting the fair value-based method in future fiscal years beginning with the
fiscal year ending December 31, 1996.
 
CONCENTRATION OF CREDIT RISK
 
     The Company sells its products primarily to its U.S. distributor. Credit is
extended based on an evaluation of the customer's financial condition, and
generally collateral is not required. Credit losses have been minimal and within
management's expectations.
 
     The Company invests its excess cash in debt instruments of financial
institutions and corporations with strong credit ratings. The Company has
established guidelines relative to diversification and maturities that maintain
safety and liquidity. These guidelines are periodically reviewed and modified to
take advantage of trends in yields and interest rates. The Company has not
experienced any realized losses on its marketable securities.
 
ASSET IMPAIRMENT
 
     In March 1995, the FASB issued SFAS No. 121, "Accounting for the Impairment
of Long-Lived Assets and for Long-Lived Assets to be Disposed Of," which
requires impairment losses to be recorded on long-lived
 
                                       F-8
<PAGE>   70
 
                        BIOSITE DIAGNOSTICS INCORPORATED
 
                  NOTES TO FINANCIAL STATEMENTS -- (CONTINUED)
    (INFORMATION FOR THE NINE MONTHS ENDED SEPTEMBER 30, 1995 IS UNAUDITED)
 
assets used in operations when indicators of impairment are present and the
estimated undiscounted cash flows to be generated by those assets are less than
the assets' carrying amount. SFAS No. 121 also addresses the accounting for
long-lived assets that are expected to be disposed of. The Company adopted the
provisions of SFAS No. 121 effective January 1, 1996. There was no effect of
such adoption on the Company's financial position or results of operations.
 
USE OF ESTIMATES
 
     The preparation of financial statements in conformity with generally
accepted accounting principles requires management to make estimates and
assumptions that affect the reported amounts of assets and liabilities and the
disclosure of contingent assets and liabilities at the date of the financial
statements and the reported amounts of revenues and expenses during the
reporting period. Actual results could differ from those estimates.
 
RECLASSIFICATION
 
     Certain amounts in the 1993, 1994 and 1995 financial statements have been
reclassified to conform to the September 30, 1996 presentation.
 
NET INCOME (LOSS) PER SHARE
 
     Net income (loss) per share is computed using the weighted average number
of common shares and common equivalent shares outstanding during each period.
Common equivalent shares are computed using the treasury stock method and
consist of common stock which may be issuable upon exercise of outstanding
common stock options, when dilutive. Pursuant to the requirements of the
Securities and Exchange Commission, common stock issued by the Company during
the twelve months immediately preceding the initial public offering, plus the
number of common equivalent shares which became issuable during the same period
pursuant to the grant of stock options, have been included in the calculation of
the shares used in computing net income (loss) per share as if these shares were
outstanding for all periods presented using the treasury stock method. In
addition, the calculation of the shares used in computing net income (loss) per
share also includes the convertible preferred stock which will convert into
8,328,847 shares of common stock and an outstanding $1.0 million convertible
debenture and related accrued interest through January 31, 1997 which will
convert into 92,222 common shares (based on the assumed initial public offering
price of $12.00 per share) upon the completion of the initial public offering
contemplated by this Prospectus, as if they were converted into common stock as
of the original dates of issuance.
 
INTERIM FINANCIAL INFORMATION
 
     The accompanying financial statements for the nine months ended September
30, 1995 are unaudited but include all adjustments (consisting only of normal
recurring adjustments) which the Company considers necessary for a fair
statement of the financial position at such dates and the operating results and
cash flows for those periods. Results for the interim periods are not
necessarily indicative of results for the entire year or future periods.
 
PRO FORMA LIABILITIES AND STOCKHOLDERS' EQUITY
 
     In December 1996, the Board of Directors authorized management of the
Company to file a Registration Statement with the Securities and Exchange
Commission for the Company to sell shares of its common stock in an initial
public offering. If the initial public offering contemplated by this Prospectus
is consummated under the terms presently anticipated, all outstanding shares of
convertible preferred stock at September 30, 1996 will automatically convert
into 8,328,847 common shares and an outstanding $1.0 million convertible
 
                                       F-9
<PAGE>   71
 
                        BIOSITE DIAGNOSTICS INCORPORATED
 
                  NOTES TO FINANCIAL STATEMENTS -- (CONTINUED)
    (INFORMATION FOR THE NINE MONTHS ENDED SEPTEMBER 30, 1995 IS UNAUDITED)
 
debenture and related interest through January 31, 1997 will convert into 92,222
common shares. Unaudited pro forma stockholders' equity as of September 30,
1996, as adjusted for the assumed conversion of the preferred stock and the
convertible debenture, is disclosed in the accompanying balance sheet.
 
2. LICENSING AGREEMENTS
 
     The Company has entered into licensing agreements to utilize certain
antibodies and/or technologies in exchange for up-front, annual milestone, or
royalty payments or a combination thereof. Certain of the upfront and annual
payments are creditable towards future royalties payable. Royalties may be
payable at rates up to 5% of product sales derived from the licensed
technologies.
 
     The Company purchased license rights for technologies utilized in products
for sale of $2.2 million and $3.5 million during the year ended December 31,
1995 and the nine months ended September 30, 1996, respectively. Accumulated
amortization of license rights at December 31, 1995, and September 30, 1996, was
$845,467 and $1,666,488 respectively.
 
3. COLLABORATIVE AGREEMENTS
 
     In September 1994, the Company entered into a collaborative development and
distribution agreement with a preferred stockholder for the development and
marketing of a new diagnostic product (the "European development and
distribution agreement"). In exchange for distribution rights to the product in
Europe, the stockholder has agreed to fund 40% of the Company's product
development costs, subject to certain maximum limits, plus certain clinical
trial costs. The total cost of the project is estimated to be approximately
$10.0 million. The stockholder's obligation to fund its share of the development
costs of the product is reduced by 40% of the consideration received from other
parties for the development of the new product and marketing rights in Japan.
The stockholder paid $660,000 in 1994 and paid an additional $660,000 in 1995.
At September 30, 1996, the Company has a receivable from the stockholder of
$242,000 under the agreement. Additionally, the stockholder will directly incur
certain of the clinical trial costs. The Company recognizes revenue under this
agreement on the percentage of completion basis as costs are incurred. For the
years ended December 31, 1994 and 1995, the Company incurred $962,000 and
$2,453,000, respectively, in expenses under this agreement and recognized
$344,000 and $561,000, respectively, as contract revenue. For the nine months
ended September 30, 1995 and 1996, the Company incurred $1,781,000 and
$1,940,000, respectively, in expenses under the agreement and recognized
$388,000 and $857,000, respectively, as contract revenue.
 
     In February 1995, the Company entered into a collaborative development and
distribution agreement that included the Asian marketing rights to a new
diagnostic product being developed. Under this agreement, the Company will
receive up to $2,000,000 upon the completion of certain milestones. Recognition
of revenue under this agreement will occur as the milestones are attained. As of
September 30 1996, the Company has received $500,000, of which $300,000 was
recognized as contract revenue in 1995 and in accordance with the European
development and distribution agreement, the remaining $200,000 was applied
against the stockholder's obligation to fund its share of the development costs.
 
                                      F-10
<PAGE>   72
 
                        BIOSITE DIAGNOSTICS INCORPORATED
 
                  NOTES TO FINANCIAL STATEMENTS -- (CONTINUED)
    (INFORMATION FOR THE NINE MONTHS ENDED SEPTEMBER 30, 1995 IS UNAUDITED)
 
4. CASH, CASH EQUIVALENTS AND MARKETABLE SECURITIES
 
     The following is a summary of cash, cash equivalents and available-for-sale
securities by balance sheet classification at December 31, 1994:
 
<TABLE>
<CAPTION>
                                                               GROSS          GROSS         ESTIMATED
                                              AMORTIZED      UNREALIZED     UNREALIZED        FAIR
                                                COST           GAINS          LOSSES          VALUE
                                             -----------     ----------     ----------     -----------
<S>                                          <C>             <C>            <C>            <C>
Cash and cash equivalents:
  Cash.....................................  $   119,646      $     --       $      --     $   119,646
  Money market fund........................       22,729            --              --          22,729
  Corporate debt securities................      250,058            --              --         250,058
                                             -----------       -------        --------     -----------
                                                 392,433            --              --         392,433
Marketable securities:
  Commercial paper.........................      493,669            --              --         493,669
  Corporate debt securities................    5,029,491            --              --       5,029,491
                                             -----------       -------        --------     -----------
                                               5,523,160            --              --       5,523,160
                                             -----------       -------        --------     -----------
          Total cash, cash equivalents and
            marketable securities..........  $ 5,915,593      $     --       $      --     $ 5,915,593
                                             ===========       =======        ========     ===========
</TABLE>
 
     The following is a summary of cash, cash equivalents and available-for-sale
securities by balance sheet classification at December 31, 1995:
 
<TABLE>
<CAPTION>
                                                               GROSS          GROSS         ESTIMATED
                                              AMORTIZED      UNREALIZED     UNREALIZED        FAIR
                                                COST           GAINS          LOSSES          VALUE
                                             -----------     ----------     ----------     -----------
<S>                                          <C>             <C>            <C>            <C>
Cash and cash equivalents:
  Cash.....................................  $   964,854      $     --       $      --     $   964,854
  Money market fund........................      915,359            --              --         915,359
  Commercial paper.........................      396,190            --              --         396,190
                                             -----------       -------        --------     -----------
                                               2,276,403            --              --       2,276,403
Marketable securities:
  Commercial paper.........................    1,662,383            --          (1,337)      1,661,046
  Corporate debt securities................   10,012,578        52,109         (23,126)     10,041,561
                                             -----------       -------        --------     -----------
                                              11,674,961        52,109         (24,463)     11,702,607
                                             -----------       -------        --------     -----------
          Total cash, cash equivalents and
            marketable securities..........  $13,951,364      $ 52,109       $ (24,463)    $13,979,010
                                             ===========       =======        ========     ===========
</TABLE>
 
                                      F-11
<PAGE>   73
 
                        BIOSITE DIAGNOSTICS INCORPORATED
 
                  NOTES TO FINANCIAL STATEMENTS -- (CONTINUED)
    (INFORMATION FOR THE NINE MONTHS ENDED SEPTEMBER 30, 1995 IS UNAUDITED)
 
     The following is a summary of cash, cash equivalents and available-for-sale
securities by balance sheet classification at September 30, 1996:
 
<TABLE>
<CAPTION>
                                                               GROSS          GROSS         ESTIMATED
                                              AMORTIZED      UNREALIZED     UNREALIZED        FAIR
                                                COST           GAINS          LOSSES          VALUE
                                             -----------     ----------     ----------     -----------
<S>                                          <C>             <C>            <C>            <C>
Cash and cash equivalents:
  Cash.....................................  $   341,948       $   --        $      --     $   341,948
  Money market fund........................    1,068,672           --               --       1,068,672
                                             -----------       ------         --------     -----------
                                               1,410,620           --               --       1,410,620
Marketable securities:
  Certificates of deposit..................      898,503        1,497               --         900,000
  Commercial paper.........................      386,683           --           (1,603)        385,080
  Corporate debt securities................    7,490,353           --          (16,779)      7,473,574
                                             -----------       ------         --------     -----------
                                               8,775,539        1,497          (18,382)      8,758,654
                                             -----------       ------         --------     -----------
Total cash, cash equivalents and marketable
  securities...............................  $10,186,159       $1,497        $ (18,382)    $10,169,274
                                             ===========       ======         ========     ===========
</TABLE>
 
     The amortized cost and estimated fair value of available-for-sale
securities at September 30, 1996, by contractual maturity, are as follows:
 
<TABLE>
<CAPTION>
                                                                                 ESTIMATED
                                                                     COST        FAIR VALUE
                                                                  ----------     ----------
    <S>                                                           <C>            <C>
    Marketable securities:
      Due in one year or less...................................  $7,581,858     $7,569,462
      Due after one year through two years......................   1,193,681      1,189,192
                                                                  ----------     ----------
                                                                  $8,775,539     $8,758,654
                                                                  ==========     ==========
</TABLE>
 
5. BALANCE SHEET INFORMATION
 
     Inventories consist of the following:
 
<TABLE>
<CAPTION>
                                                          DECEMBER 31,
                                                    -------------------------     SEPTEMBER 30,
                                                       1994           1995            1996
                                                    ----------     ----------     -------------
    <S>                                             <C>            <C>            <C>
    Raw materials.................................  $  521,889     $  645,097      $   417,302
    Work in process...............................     526,787        965,925        1,102,610
    Finished goods................................      89,154         78,102          189,104
                                                    ----------     ----------       ----------
                                                    $1,137,830     $1,689,124      $ 1,709,016
                                                    ==========     ==========       ==========
</TABLE>
 
                                      F-12
<PAGE>   74
 
                        BIOSITE DIAGNOSTICS INCORPORATED
 
                  NOTES TO FINANCIAL STATEMENTS -- (CONTINUED)
    (INFORMATION FOR THE NINE MONTHS ENDED SEPTEMBER 30, 1995 IS UNAUDITED)
 
     Property, equipment and leasehold improvements consist of the following:
 
<TABLE>
<CAPTION>
                                                         DECEMBER 31,              SEPTEMBER
                                                  ---------------------------         30,
                                                     1994            1995            1996
                                                  -----------     -----------     -----------
    <S>                                           <C>             <C>             <C>
    Machinery and equipment.....................  $ 3,623,954     $ 5,666,978     $ 6,868,726
    Furniture and fixtures......................      376,084         548,824         631,570
    Leasehold improvements......................      185,784         652,335         746,764
                                                  -----------     -----------     -----------
                                                    4,185,822       6,868,137       8,247,060
    Less accumulated depreciation and
      amortization..............................   (2,326,249)     (3,268,168)     (4,305,540)
                                                  -----------     -----------     -----------
                                                  $ 1,859,573     $ 3,599,969     $ 3,941,520
                                                  ===========     ===========     ===========
</TABLE>
 
6. DEBT AND LEASE COMMITMENTS
 
     Debt and capital lease obligations consist of the following:
 
<TABLE>
<CAPTION>
                                                           DECEMBER 31,            SEPTEMBER
                                                     -------------------------        30,
                                                        1994           1995           1996
                                                     ----------     ----------     ----------
    <S>                                              <C>            <C>            <C>
    Convertible debenture, payable on September 29,
      2000, including interest at 8% per annum.....  $       --     $1,000,000     $1,000,000
    Equipment financing notes, payable $122,687
      monthly including interest at 8.1% to 11.8%,
      due October 1996 to November 2001 secured by
      equipment....................................     963,538      2,648,272      3,261,222
    Capital lease obligations......................     448,478        203,913             --
                                                     ----------     ----------     ----------
                                                      1,412,016      3,852,185      4,261,222
    Less current portion...........................     640,453      1,112,712      1,027,579
                                                     ----------     ----------     ----------
                                                     $  771,563     $2,739,473     $3,233,643
                                                     ==========     ==========     ==========
</TABLE>
 
     At the sole option of the Company, the debenture is convertible into shares
of common stock of the Company upon consummation of a public offering of common
stock with aggregate proceeds in excess of $7,500,000 and at a price of not less
than $9.00 per share. The debenture is convertible at the public offering price.
In the event a public offering is not consummated on or before December 31,
1996, the debenture is convertible, at the sole option of the Company, into
shares of the Company's preferred stock, at the initial issue price for such
shares in connection with a private placement of the Company's preferred stock.
Under a licensing agreement, the Company is obligated to issue up to a maximum
of $1,000,000 of additional convertible debentures with five-year terms upon the
attainment of certain milestones. The debentures are convertible, at the option
of the Company, into shares of common stock at the initial public offering
price.
 
     As of September 30, 1996, approximate future principal payments of the
equipment financing notes are due as follows: 1996 - $275,000; 1997 - $957,000;
1998 - $740,000; 1999 - $635,000; 2000 - $506,000 and 2001 - $148,000.
 
     The Company leases its office and research facilities and certain equipment
under operating and capital leases. The minimum annual rent on the facilities is
subject to increases based on changes in the Consumer Price Index, taxes,
insurance and operating costs, subject to certain minimum and maximum annual
increases. The Company has options to renew certain of the facilities leases for
a period of two years. Included in deposits and other assets in the accompanying
balance sheets is approximately $728,000, $367,000 and $271,000 of security
deposits in conjunction with operating lease and equipment financing agreements
at December 31, 1994, 1995 and September 30, 1996, respectively.
 
                                      F-13
<PAGE>   75
 
                        BIOSITE DIAGNOSTICS INCORPORATED
 
                  NOTES TO FINANCIAL STATEMENTS -- (CONTINUED)
    (INFORMATION FOR THE NINE MONTHS ENDED SEPTEMBER 30, 1995 IS UNAUDITED)
 
     Approximate annual future minimum lease payments as of September 30, 1996
are as follows:
 
<TABLE>
<CAPTION>
                                                                           OPERATING
        YEAR                                                                 LEASES
        ----                                                               ----------
        <S>                                                                <C>
        1996.............................................................  $  247,000
        1997.............................................................     949,000
        1998.............................................................     105,000
                                                                           ----------
                  Total minimum lease payments...........................  $1,301,000
                                                                           ==========
</TABLE>
 
     Rent expense for the years ended December 31, 1993, 1994 and 1995 was
approximately $392,000, $550,000 and $734,000, respectively. Rent expense for
the nine months ended September 30, 1995 and 1996 was $527,000 and $628,000,
respectively. Equipment under equipment financing notes and capital leases was
approximately $2,443,000, $4,407,000 and $4,832,000 at December 31, 1994 and
1995, and September 30, 1996, respectively. Accumulated depreciation of
equipment under equipment loans and capital leases at December 31, 1994 and 1995
and September 30, 1996 was approximately $945,000, $1,465,000 and $1,643,000,
respectively.
 
7. STOCKHOLDERS' EQUITY
 
CONVERTIBLE PREFERRED STOCK
 
     A summary of the convertible preferred stock issued and outstanding is as
follows:
 
<TABLE>
<CAPTION>
                                                         SHARES                     PREFERENCE
                                                       ISSUED AND                       IN
                                                       OUTSTANDING    PAR VALUE     LIQUIDATION
                                                       ----------     ---------     -----------
    <S>                                                <C>            <C>           <C>
    Series A.........................................     610,000      $  6,100     $   610,000
    Series B.........................................   2,156,336        21,563       3,061,997
    Series C.........................................   2,204,167        22,042       5,290,000
    Series D.........................................   1,900,010        19,000       5,700,030
    Series E.........................................   1,458,334        14,583       7,000,003
                                                        ---------       -------     ------------
                                                        8,328,847      $ 83,288     $21,662,030
                                                        =========       =======     ============
</TABLE>
 
     The Series A, Series B, Series C, Series D and Series E preferred stock is
convertible on a one to one basis into a total of 8,328,847 shares of the
Company's common stock, respectively, subject to certain antidilution
adjustments. Additionally, outstanding preferred stock will automatically
convert into common stock immediately upon the closing of an underwritten public
offering of the common stock of the Company at an offering price of at least
$9.00 per share and having an aggregate offering price to the public of at least
$7.5 million. The holder of each share of preferred stock is entitled to one
vote for each share of common stock into which it would convert.
 
     On or after September 7, 1997, upon consent of at least two thirds of the
existing Series A, Series B, Series C, Series D and Series E preferred
stockholders, the preferred stock may be redeemed, at the option of the Board of
Directors, for $1.10, $1.56, $2.64, $3.30 and $5.28 per share for the Series A,
Series B, Series C, Series D and Series E preferred stock, respectively, plus
any accrued and unpaid dividends.
 
     Annual dividends of $.08, $.1278, $.216, $.27 and $.432 per share of Series
A, Series B, Series C, Series D and Series E preferred stock, respectively, are
payable whenever funds are legally available when and as declared by the Board
of Directors. No dividends have been declared to date.
 
                                      F-14
<PAGE>   76
 
                        BIOSITE DIAGNOSTICS INCORPORATED
 
                  NOTES TO FINANCIAL STATEMENTS -- (CONTINUED)
    (INFORMATION FOR THE NINE MONTHS ENDED SEPTEMBER 30, 1995 IS UNAUDITED)
 
COMMON STOCK
 
  1989 Stock Plan
 
     The Company has adopted a stock plan which provides for both the direct
sale of common stock and for the grant of options to purchase common stock to
employees, directors, consultants and advisors of the Company. A total of
1,692,000 shares have been reserved for issuance under the plan. As of September
30, 1996, 144,476 shares have been sold directly under the plan.
 
     Information with respect to the Company's option activity is as follows:
 
<TABLE>
<CAPTION>
                                                                SHARES             PRICE
                                                               ---------       -------------
    <S>                                                        <C>             <C>
    Balance at December 31, 1992.............................    413,300       $0.24 -- 1.00
      Granted................................................    252,800       $1.00 -- 2.00
      Exercised..............................................    (15,514)      $0.24 -- 1.00
      Cancelled..............................................    (37,686)      $0.24 -- 1.00
                                                               ---------        ------------
    Balance at December 31, 1993.............................    612,900       $0.24 -- 2.00
      Granted................................................    109,150       $2.00
      Exercised..............................................     (1,699)      $0.50 -- 2.00
      Cancelled..............................................     (5,701)      $0.50 -- 2.00
                                                               ---------        ------------
    Balance at December 31, 1994.............................    714,650       $0.24 -- 2.00
      Granted................................................    300,750       $2.00 -- 3.25
      Exercised..............................................   (215,529)      $0.07 -- 2.00
      Cancelled..............................................    (11,616)      $0.24 -- 2.00
                                                               ---------        ------------
    Balance at December 31, 1995.............................    788,255       $0.24 -- 3.25
      Granted................................................    819,700       $3.25 -- 9.00
      Exercised..............................................    (90,498)      $0.24 -- 3.25
      Cancelled..............................................   (353,590)      $0.50 -- 9.00
                                                               ---------        ------------
    Balance at September 30, 1996............................  1,163,867       $0.24 -- 8.25
                                                               =========        ============
</TABLE>
 
     The options are generally subject to four year vesting and expire ten years
from the date of grant. At September 30, 1996, 454,411 shares were exercisable
and 56,099 shares were available for future issuance of common stock or grant of
options to purchase common stock under the 1989 Stock Plan.
 
     During the period of May 17, 1996 to September 6, 1996, the Company granted
options to purchase 331,950 shares of common stock at $8.25 to $9.00 per share.
On September 6, 1996, these stock options were repriced to $5.50 per share.
 
  1996 Stock Incentive Plan
 
     In December 1996, the Company adopted the 1996 Stock Incentive Plan (the
"1996 Stock Plan") effective as of December 1, 1996. The 1996 Stock Plan
replaces the Company's 1989 Stock Plan. Although all future awards will be made
under the 1996 Stock Plan, awards made under the 1989 Stock Plan will continue
to be administered in accordance with the 1989 Stock Plan. The 1996 Stock Plan
provides for awards in the form of restricted shares, stock units, options or
stock appreciation rights or any combination thereof. A pool of 900,000 shares,
increased by the amount of all unpurchased shares of common stock pursuant to
expired or terminated options, as of November 30, 1996, under the 1989 Stock
Plan, has been reserved for issuance under the 1996 Stock Plan.
 
                                      F-15
<PAGE>   77
 
                        BIOSITE DIAGNOSTICS INCORPORATED
 
                  NOTES TO FINANCIAL STATEMENTS -- (CONTINUED)
    (INFORMATION FOR THE NINE MONTHS ENDED SEPTEMBER 30, 1995 IS UNAUDITED)
 
  Deferred Compensation
 
     The Company records and amortizes over the related vesting periods deferred
compensation representing the excess of the deemed value for accounting purposes
of the options granted over their aggregate exercise price.
 
     In October, November and December 1996, the Company granted additional
options to purchase 128,350 shares of Common Stock at the exercise price of
$5.50 per share. The Company will record compensation expense of approximately
$390,225 over the vesting period of these options.
 
  Employee Stock Purchase Plan
 
     In December 1996, the Company adopted an Employee Stock Purchase Plan
("ESPP") which provides employees the opportunity to purchase common stock at a
discount and pay for such purchases through payroll deductions. A pool of
100,000 shares of common stock has been reserved for issuance under the ESPP
(subject to anti-dilution provisions).
 
8. INCOME TAXES
 
     Significant components of the income tax benefit (provision) are as
follows:
 
<TABLE>
<CAPTION>
                                            YEARS ENDED DECEMBER 31,
                                      ------------------------------------     NINE MONTHS ENDED
                                        1993         1994          1995        SEPTEMBER 30, 1996
                                      --------     --------     ----------     ------------------
    <S>                               <C>          <C>          <C>            <C>
    Current:
      Federal.......................  $     --     $(63,000)    $ (150,000)        $  (69,000)
      State.........................        --           --        (10,000)            (3,000)
                                      --------     --------     ----------          ---------
                                            --      (63,000)      (160,000)           (72,000)
    Deferred:
      Federal.......................        --           --      1,668,000            454,000
      State.........................        --           --        159,000           (118,000)
                                      --------     --------     ----------          ---------
                                            --           --      1,827,000            336,000
                                      --------     --------     ----------          ---------
                                      $     --     $(63,000)    $1,667,000         $  264,000
                                      ========     ========     ==========          =========
</TABLE>
 
     The provision for income taxes for the nine months ended September 30, 1996
was determined utilizing an effective tax rate based on the estimated operating
results for 1996, expected utilization of net operating loss carryforwards and
other tax credits and changes in deferred tax assets including a reduction of
the valuation allowance for deferred tax assets of $1,119,000.
 
     As of December 31, 1995, the Company had a federal net operating loss
carryforward of approximately $3,058,000 and no tax loss carryforward for
California. The Company also had federal and California research and development
credit carryforwards of approximately $906,000 and $92,000, respectively. The
difference between the federal and California tax loss carryforwards is
primarily attributable to the capitalization of research and development
expenses for California tax purposes and the fifty percent limitation on
California loss carryforwards. The federal tax loss and research credit
carryforwards will begin expiring in 2003 unless previously utilized. In 1995,
the Company utilized federal and state net operating loss carryforwards of
approximately $7,108,000 and $4,473,000, respectively, to offset taxable income.
 
                                      F-16
<PAGE>   78
 
                        BIOSITE DIAGNOSTICS INCORPORATED
 
                  NOTES TO FINANCIAL STATEMENTS -- (CONTINUED)
    (INFORMATION FOR THE NINE MONTHS ENDED SEPTEMBER 30, 1995 IS UNAUDITED)
 
     Significant components of the Company's deferred tax assets as of December
31, 1994 and 1995 are shown below. For the year ended December 31, 1995, and the
nine months ended September 30, 1996, the Company decreased the valuation
allowance for deferred tax assets $1,827,000 and $1,119,000, respectively, as
the realization of such assets became probable.
 
<TABLE>
<CAPTION>
                                                                       DECEMBER 31,
                                                                ---------------------------
                                                                   1994            1995
                                                                -----------     -----------
    <S>                                                         <C>             <C>
    Deferred tax assets:
      Capitalized research expenses...........................  $   247,000     $   154,000
      Net operating loss carryforwards........................    3,275,000       1,070,000
      Research and development credits........................    1,258,000         998,000
      Other...................................................      338,000         854,000
                                                                 ----------      ----------
              Total deferred tax assets.......................    5,118,000       3,076,000
    Deferred tax liability:
      Tax over book depreciation..............................      (80,000)       (130,000)
                                                                 ----------      ----------
                                                                  5,038,000       2,946,000
    Valuation allowance for deferred tax assets...............   (5,038,000)     (1,119,000)
                                                                 ----------      ----------
    Net deferred tax assets...................................  $        --     $ 1,827,000
                                                                 ==========      ==========
</TABLE>
 
     The reconciliation of income tax computed at the federal statutory tax rate
to the (provision) benefit for income taxes is as follows:
 
<TABLE>
<CAPTION>
                                                                                    NINE MONTHS
                                                                                       ENDED
                                                                                   SEPTEMBER 30,
                                                        1993     1994     1995         1996
                                                        ----     ----     ----     -------------
    <S>                                                 <C>      <C>      <C>      <C>
    Tax at federal statutory rate.....................  (35 )%    35 %     35 %          35%
    Permanent tax differences.........................   --        5        1             1
    Increase (decrease) of the valuation
      allowance for deferred tax assets...............   35 %    (36 )    (63 )         (25)
    Other.............................................   --       (1 )     --            --
                                                        ----     ----     ----          ---
    Effective rate....................................   --        3 %    (27 )%         11%
                                                        ====     ====     ====     ==========
</TABLE>
 
     Pursuant to Internal Revenue Code Section 382, use of the Company's net
operating loss and tax credit carryforwards may be limited if a cumulative
change in ownership of more than 50% occurs within any three year period.
However, any annual limitation is not expected to have a material adverse effect
on the Company's ability to utilize its net operating loss and tax credit
carryforwards.
 
9. EMPLOYEE SAVINGS PLAN
 
     In 1991, the Company implemented a 401(k) program which allows all
qualifying employees to contribute up to a maximum of 20% of their annual
salary, subject to annual limits. The Board of Directors may, at its sole
discretion, approve Company contributions. No such contributions have been
approved or made.
 
10. SETTLEMENT OF PATENT MATTERS
 
     In September 1996, the Company reached a settlement with a competitor with
respect to all claims in a lawsuit filed by the competitor in May 1994. The
complaint alleged that the Company's Triage Panel for
 
                                      F-17
<PAGE>   79
 
                        BIOSITE DIAGNOSTICS INCORPORATED
 
                  NOTES TO FINANCIAL STATEMENTS -- (CONTINUED)
    (INFORMATION FOR THE NINE MONTHS ENDED SEPTEMBER 30, 1995 IS UNAUDITED)
 
Drugs of Abuse product infringed a patent licensed to the competitor. The
Company vigorously defended the lawsuit. However, to avoid protracted
litigation, the Company settled the patent matter in September 1996, and paid $2
million as a settlement of the litigation and, for an additional $3.5 million
and the agreement to pay certain royalties, obtained a license to certain
technology.
 
     The Company has charged to settlement of patent matters in the accompanying
statements of income the $2 million litigation settlement, applicable license
costs related to prior years and the related legal defense costs. Legal defense
costs totaled $338,004 and $777,070 for the years ended December 31, 1994 and
1995, respectively, and $743,173 and $17,119 for the nine months ended September
30, 1995 and 1996, respectively.
 
     Additionally, in December 1995, the Company was notified that it should
evaluate whether its current products infringe upon certain patent claims held
by another company. In March 1996, the Company settled this matter by obtaining
a world-wide license to the technology. The Company accrued the one-time license
fee of $2.2 million in December 1995. Amortization of this license related to
fiscal years prior to 1995 was charged to Settlement of Patent Matters in 1995.
 
                                      F-18
<PAGE>   80
 
       [PHOTOGRAPHS SHOWING TRIAGE DOA AND PERSONS PERFORMING TRIAGE DOA
                               TESTING PROCEDURE]
 
                                   BIOSITE(R)
 
                                  DIAGNOSTICS
 
                                   DEVELOPS,
 
                                  MANUFACTURES
 
                                      AND
 
                                    MARKETS
 
                                   IMMEDIATE
 
                                    RESPONSE
 
                                DIAGNOSTICS(TM)
<PAGE>   81
====================================================== 
 
  NO DEALER, SALESPERSON OR OTHER PERSON HAS BEEN AUTHORIZED TO GIVE ANY
INFORMATION OR TO MAKE ANY REPRESENTATIONS NOT CONTAINED IN THIS PROSPECTUS AND,
IF GIVEN OR MADE, SUCH INFORMATION OR REPRESENTATIONS MUST NOT BE RELIED UPON AS
HAVING BEEN AUTHORIZED BY THE COMPANY OR ANY OF THE UNDERWRITERS OR BY ANY OTHER
PERSON. THIS PROSPECTUS DOES NOT CONSTITUTE AN OFFER TO SELL OR A SOLICITATION
OF AN OFFER TO BUY A SECURITY OTHER THAN THE SHARES OF COMMON STOCK OFFERED
HEREBY, NOR DOES IT CONSTITUTE AN OFFER TO SELL OR A SOLICITATION OF AN OFFER TO
BUY ANY OF THE SECURITIES OFFERED HEREBY, TO ANY PERSON IN ANY JURISDICTION IN
WHICH IT IS UNLAWFUL TO MAKE SUCH OFFER OR SOLICITATION TO SUCH PERSON. NEITHER
THE DELIVERY OF THIS PROSPECTUS NOR ANY SALE MADE HEREUNDER SHALL UNDER ANY
CIRCUMSTANCES CREATE ANY IMPLICATION THAT THE INFORMATION CONTAINED HEREIN IS
CORRECT AS OF ANY DATE SUBSEQUENT TO THE DATE HEREOF.
 
                            ------------------------
 
                               TABLE OF CONTENTS
 
<TABLE>
<CAPTION>
                                         PAGE
                                         ----
<S>                                      <C>
Prospectus Summary.....................    3
Risk Factors...........................    6
Use of Proceeds........................   15
Dividend Policy........................   15
Capitalization.........................   16
Dilution...............................   17
Selected Financial Data................   18
Management's Discussion and Analysis of
  Financial Condition and Results of
  Operations...........................   19
Business...............................   24
Management.............................   42
Certain Transactions...................   50
Principal Stockholders.................   51
Description of Capital Stock...........   53
Shares Eligible for Future Sale........   55
Underwriting...........................   57
Legal Matters..........................   58
Experts................................   58
Additional Information.................   58
Index to Financial Statements..........  F-1
</TABLE>
 
                            ------------------------
 
  UNTIL                , 1997 (25 DAYS AFTER THE DATE OF THIS PROSPECTUS), ALL
DEALERS EFFECTING TRANSACTIONS IN THE COMMON STOCK, WHETHER OR NOT PARTICIPATING
IN THIS DISTRIBUTION, MAY BE REQUIRED TO DELIVER A PROSPECTUS. THIS DELIVERY
REQUIREMENT IS IN ADDITION TO THE OBLIGATION OF DEALERS TO DELIVER A PROSPECTUS
WHEN ACTING AS UNDERWRITERS AND WITH RESPECT TO THEIR UNSOLD ALLOTMENTS OR
SUBSCRIPTIONS.
======================================================

======================================================
 
                                2,000,000 SHARES
 
                                      LOGO
 
                                  COMMON STOCK
 
                            ------------------------
 
                                   PROSPECTUS
                            ------------------------
 
                                COWEN & COMPANY
 
                               ALEX. BROWN & SONS
                                  INCORPORATED
 
                                            , 1997
 
======================================================
<PAGE>   82
 
                                    PART II
 
                     INFORMATION NOT REQUIRED IN PROSPECTUS
 
ITEM 13.  OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION
 
     The following table sets forth the various expenses expected to be incurred
by the Registrant in connection with the sale and distribution of the securities
being registered hereby, other than underwriting discounts and commissions. All
amounts are estimated except the Securities and Exchange Commission registration
fee, the Nasdaq listing fee and the National Association of Securities Dealers,
Inc. ("NASD") filing fee.
 
<TABLE>
    <S>                                                                         <C>
    SEC registration fee......................................................  $  9,061
    NASD filing fee...........................................................     3,490
    Nasdaq listing fee........................................................    47,963
    NASD expenses.............................................................     2,000
    Accounting fees and expenses..............................................   150,000
    Legal fees and expenses...................................................   250,000
    Printing and engraving expenses...........................................   150,000
    Registrar and Transfer Agent's fees.......................................    25,000
    Miscellaneous fees and expenses...........................................    62,486
                                                                                --------
              Total...........................................................  $700,000
                                                                                ========
</TABLE>
 
ITEM 14.  INDEMNIFICATION OF DIRECTORS AND OFFICERS
 
     Section 145 of the Delaware General Corporation Law provides for the
indemnification of officers, directors, and other corporate agents in terms
sufficiently broad to indemnify such persons under certain circumstances for
liabilities (including reimbursement for expenses incurred) arising under the
Securities Act of 1933, as amended (the "Act"). Article VII of the Registrant's
Restated Certificate of Incorporation (Exhibit 3.(i).3 hereto) and Article V of
the Registrant's Bylaws (Exhibit 3.(ii).2 hereto) provide for indemnification of
the Registrant's directors, officers, employees and other agents to the extent
and under the circumstances permitted by the Delaware General Corporation Law.
The Registrant has also entered into agreements with its directors and officers
that will require the Registrant, among other things, to indemnify them against
certain liabilities that may arise by reason of their status or service as
directors or officers to the fullest extent not prohibited by law.
 
     The Underwriting Agreement (Exhibit 1.1) provides for indemnification by
the Underwriters of the Registrant, its directors and officers, and by the
Registrant of the Underwriters, for certain liabilities, including liabilities
arising under the Act, and affords certain rights of contribution with respect
thereto.
 
ITEM 15.  RECENT SALES OF UNREGISTERED SECURITIES
 
     Since December 1, 1993, the Registrant has sold and issued the following
unregistered securities:
 
          (a) On various dates through December 1, 1996, the Registrant issued
     323,240 shares of its Common Stock to employees pursuant to the exercise of
     options granted under its 1989 Stock Plan. The exercise prices per share
     ranged from $0.24 to $3.25, for an aggregate consideration of $167,076. The
     Registrant relied on the exemption provided by Rule 701 under the Act.
 
          (b) In September 1995, the Company issued a $1,000,000 convertible
     debenture to Sandoz Pharma Ltd. relying on the exemption provided by
     Section 4(2) under the Act.
 
     The recipients of the above-described securities represented their
intention to acquire the securities for investment only and not with a view to
distribution thereof. Appropriate legends were affixed to the stock certificates
and debenture issued in such transactions. All recipients had adequate access,
through employment or other relationships, to information about the Registrant.
 
                                      II-1
<PAGE>   83
 
ITEM 16.  EXHIBITS AND FINANCIAL STATEMENT SCHEDULES
 
     (A) EXHIBITS
 
<TABLE>
<CAPTION>
EXHIBIT
 NUMBER                                 DESCRIPTION OF DOCUMENT
- --------   ----------------------------------------------------------------------------------
<C>        <S>
 1.1       Form of Underwriting Agreement.
 3.(i)1    Restated Certificate of Incorporation.
 3.(i)2    Form of Certificate of Amendment of Restated Certificate of Incorporation to be
           filed prior to the effective date of this Registration Statement.
 3.(i)3    Form of Restated Certificate of Incorporation, to be filed upon closing of the
           offering to which this Registration Statement relates.
 3.(ii)1   Bylaws of the Registrant, as amended.
 3.(ii)2   Proposed Amended and Restated Bylaws of the Registrant.
 4.1*      Form of Common Stock Certificate.
 5.1       Legal opinion of Pillsbury Madison & Sutro LLP.
10.1       Amended and Restated 1989 Stock Plan of Biosite Diagnostics Incorporated.
10.2       1996 Stock Incentive Plan of Biosite Diagnostics Incorporated ("1996 Stock Plan").
10.3       Form of Incentive Stock Option Agreement under the 1996 Stock Plan.
10.4       Form of Nonstatutory Stock Option Agreement under the 1996 Stock Plan.
10.5       Biosite Diagnostics Incorporated Employee Stock Purchase Plan.
10.6       Form of Indemnity Agreement between the Registrant and its officers and directors.
10.7*      Lease Agreement between the Registrant and General Atomics, dated November 30,
           1989, with related addenda, as amended on December 1, 1987 and May 30, 1990.
10.8(+)*   Antibody License Agreement between the Registrant and Sandoz Pharma Ltd., dated
           September 22, 1995, as amended on July 26, 1996.
10.9(+)*   Easy Assay License Agreement between the Registrant and Sandoz Pharma Ltd., dated
           September 22, 1995.
10.10(+)*  Distribution Agreement between the Registrant and Curtin Matheson Scientific,
           Inc., dated November 11, 1991, as amended on March 7, 1994, March 12, 1996 and
           August 9, 1996.
10.11(+)*  Development, Supply and Distribution Agreement between the Registrant and Kyoto
           Dai-Ichi Kagaku Co., Ltd., dated as of February 14, 1995.
10.12(+)*  Development and Supply Agreement between the Registrant and LRE Relais +
           Elektronik GmbH -- Medical Technology, dated September 23, 1994.
10.13(+)*  Distributorship Agreement between the Registrant and E. Merck KGaA, dated July 27,
           1992, as amended on November 10, 1993, January 13, 1994 and December 11, 1995.
10.14(+)*  Collaborative Development Agreement between the Registrant and Merck KGaA, dated
           July 1, 1994.
10.15(+)*  Supply and Distribution Agreement between the Registrant and E. Merck KGaA, dated
           as of June 28, 1994.
10.16(+)*  Research and Development Agreement between the Registrant and Ixsys, Inc., dated
           July 1, 1992.
10.17      Stock Purchase Agreement dated as of October 30, 1991 between the Registrant and
           certain purchasers of Series D Preferred Stock.
10.18      Stock Purchase Agreement dated as of November 25, 1992 between the Registrant and
           Merck KGaA concerning Series E Preferred Stock.
10.19(+)*  Debenture Purchase Agreement between the Registrant and Sandoz Pharma Ltd., dated
           as of September 22, 1995.
10.20(+)*  Settlement and License Agreement & Agreement of Dismissal with Prejudice, dated as
           of September 6, 1996, by and between the Registrant and Abbott Laboratories.
11.1       Statement of computation of earnings per share.
</TABLE>
 
                                      II-2
<PAGE>   84
 
<TABLE>
<CAPTION>
EXHIBIT
 NUMBER                                 DESCRIPTION OF DOCUMENT
- --------   ----------------------------------------------------------------------------------
<C>        <S>
23.1       Consent of Ernst & Young LLP, independent auditors.
23.2       Consent of Pillsbury Madison & Sutro LLP (included in Exhibit 5.1).
24.1       Power of Attorney (see Page II-4).
27.1       Financial Data Schedule.
</TABLE>
 
- ---------------
 *  To be filed by amendment.
 
(+) Confidential treatment requested.
 
     (B) FINANCIAL STATEMENT SCHEDULES
 
     Schedules other than those referred to above have been omitted because they
are not applicable or not required or because the information is included
elsewhere in the Financial Statements or the notes thereto.
 
ITEM 17.  UNDERTAKINGS
 
     Insofar as indemnification for liabilities arising under the Securities Act
of 1933, as amended (the "Act"), may be permitted to directors, officers and
controlling persons of the Registrant pursuant to the foregoing provisions, or
otherwise, the Registrant has been advised that in the opinion of the Securities
and Exchange Commission such indemnification is against public policy as
expressed in the Act and is, therefore, unenforceable. In the event that a claim
for indemnification against such liabilities (other than the payment by the
Registrant of expenses incurred or paid by a director, officer or controlling
person of the Registrant in the successful defense of any action, suit or
proceeding) is asserted by such director, officer or controlling person in
connection with the securities being registered, the Registrant will, unless in
the opinion of its counsel the matter has been settled by controlling precedent,
submit to a court of appropriate jurisdiction the question whether such
indemnification by it is against public policy as expressed in the Act and will
be governed by the final adjudication of such issue.
 
     The undersigned Registrant hereby undertakes that:
 
          (1) For purposes of determining any liability under the Act, the
     information omitted from the form of prospectus filed as part of this
     registration statement in reliance upon Rule 430A and contained in a form
     of prospectus filed by the Registrant pursuant to Rule 424(b)(1) or (4) or
     497(h) under the Act shall be deemed to be part of this registration
     statement as of the time it was declared effective.
 
          (2) For the purpose of determining any liability under the Act, each
     post-effective amendment that contains a form of prospectus shall be deemed
     to be a new registration statement relating to the securities offered
     therein, and the offering of such securities at that time shall be deemed
     to be the initial bona fide offering thereof.
 
          (3) It will provide to the underwriters at the closing(s) specified in
     the underwriting agreement certificates in such denominations and
     registered in such names as required by the underwriters to permit prompt
     delivery to each purchaser.
 
                                      II-3
<PAGE>   85
 
                                   SIGNATURES
 
     Pursuant to the requirements of the Securities Act of 1933, the Registrant
has duly caused this Registration Statement to be signed on its behalf by the
undersigned, thereunto duly authorized, in the City of San Diego, State of
California, on the 11th day of December, 1996.
 
                                          BIOSITE DIAGNOSTICS INCORPORATED
 
                                          By    /s/  KIM D. BLICKENSTAFF
 
                                            ------------------------------------
                                                    Kim D. Blickenstaff
                                               President and Chief Executive
                                                           Officer
 
                               POWER OF ATTORNEY
 
     KNOW ALL MEN BY THESE PRESENTS, that each person whose signature appears
below constitutes and appoints Kim D. Blickenstaff, Christopher J. Twomey and S.
Nicholas Stiso and each of them, his true and lawful attorneys-in-fact and
agents, each with full power of substitution and resubstitution, for him and in
his name, place and stead, in any and all capacities, to sign any and all
amendments, including post-effective amendments, to this Registration Statement,
and to sign any registration statement filed under Rule 462 under the Securities
Act of 1933, and including any amendments, including post-effective amendments,
thereto, and to file the same, with exhibits thereto and other documents in
connection therewith, with the Securities and Exchange Commission, granting unto
said attorneys-in-fact and agents, and each of them, full power and authority to
do and perform each and every act and thing requisite and necessary to be done,
as fully to all intents and purposes as he might or could do in person, hereby
ratifying and confirming all that each of said attorneys-in-fact and agents or
their substitute or substitutes may lawfully do or cause to be done by virtue
hereof.
 
     Pursuant to the requirements of the Securities Act of 1933, this
Registration Statement has been signed below by the following persons in the
capacities and on the dates indicated.
 
<TABLE>
<CAPTION>
                   NAME                                 TITLE                      DATE
- ------------------------------------------  ------------------------------  ------------------
<C>                                         <S>                             <C>
                   /s/  KIM D.              President, Chief Executive       December 11, 1996
               BLICKENSTAFF                 Officer (Principal Executive
- ------------------------------------------  Officer) and Director
           Kim D. Blickenstaff
          /s/  CHRISTOPHER J. TWOMEY        Vice President and Chief         December 11, 1996
- ------------------------------------------  Financial Officer (Principal
          Christopher J. Twomey             Financial Officer and
                                            Accounting Officer)
           /s/  TIMOTHY J. WOLLAEGER        Chairman of the Board            December 11, 1996
- ------------------------------------------
           Timothy J. Wollaeger
        /s/  GUNARS E. VALKIRS, PH.D.       Director                         December 11, 1996
- ------------------------------------------
         Gunars E. Valkirs, Ph.D.
         /s/  THOMAS H. ADAMS, PH.D.        Director                         December 11, 1996
- ------------------------------------------
          Thomas H. Adams, Ph.D.
</TABLE>
 
                                      II-4
<PAGE>   86
 
<TABLE>
<CAPTION>
                   NAME                                 TITLE                      DATE
- ------------------------------------------  ------------------------------  ------------------
<C>                                         <S>                             <C>
          /s/  HOWARD E. GREENE, JR.        Director                         December 11, 1996
- ------------------------------------------
          Howard E. Greene, Jr.
           /s/  FREDERICK J. DOTZLER        Director                         December 11, 1996
- ------------------------------------------
           Frederick J. Dotzler
              /s/  STEPHEN K. REIDY         Director                         December 11, 1996
- ------------------------------------------
             Stephen K. Reidy
               /s/  JESSE I. TREU,          Director                         December 11, 1996
                  PH.D.
- ------------------------------------------
           Jesse I. Treu, Ph.D.
</TABLE>
 
                                      II-5
<PAGE>   87
 
                                 EXHIBIT INDEX
 
<TABLE>
<CAPTION>
                                                                                              SEQUENTIALLY
EXHIBIT                                                                                         NUMBERED
 NUMBER                                  DESCRIPTION OF DOCUMENT                                  PAGE
- --------   -----------------------------------------------------------------------------------------------
<C>        <S>                                                                                <C>
 1.1       Form of Underwriting Agreement.
 3.(i)1    Restated Certificate of Incorporation.
 3.(i)2    Form of Certificate of Amendment of Restated Certificate of Incorporation to be
           filed prior to the effective date of this Registration Statement.
 3.(i)3    Form of Restated Certificate of Incorporation, to be filed upon closing of the
           offering to which this Registration Statement relates.
 3.(ii)1   Bylaws of the Registrant, as amended.
 3.(ii)2   Proposed Amended and Restated Bylaws of the Registrant.
 4.1*      Form of Common Stock Certificate.
 5.1       Legal opinion of Pillsbury Madison & Sutro LLP.
10.1       Amended and Restated 1989 Stock Plan of Biosite Diagnostics Incorporated.
10.2       1996 Stock Incentive Plan of Biosite Diagnostics Incorporated ("1996 Stock Plan").
10.3       Form of Incentive Stock Option Agreement under the 1996 Stock Plan.
10.4       Form of Nonstatutory Stock Option Agreement under the 1996 Stock Plan.
10.5       Biosite Diagnostics Incorporated Employee Stock Purchase Plan.
10.6       Form of Indemnity Agreement between the Registrant and its officers and directors.
10.7*      Lease Agreement between the Registrant and General Atomics, dated November 30,
           1989, with related addenda, as amended on December 1, 1987 and May 30, 1990.
10.8(+)*   Antibody License Agreement between the Registrant and Sandoz Pharma Ltd., dated
           September 22, 1995, as amended on July 26, 1996.
10.9(+)*   Easy Assay License Agreement between the Registrant and Sandoz Pharma Ltd., dated
           September 22, 1995.
10.10(+)*  Distribution Agreement between the Registrant and Curtin Matheson Scientific, Inc.,
           dated November 11, 1991, as amended on March 7, 1994, March 12, 1996 and August 9,
           1996.
10.11(+)*  Development, Supply and Distribution Agreement between the Registrant and Kyoto
           Dai-Ichi Kagaku Co., Ltd., dated as of February 14, 1995.
10.12(+)*  Development and Supply Agreement between the Registrant and LRE Relais + Elektronik
           GmbH -- Medical Technology, dated September 23, 1994.
10.13(+)*  Distributorship Agreement between the Registrant and E. Merck KGaA, dated July 27,
           1992, as amended on November 10, 1993, January 13, 1994 and December 11, 1995.
10.14(+)*  Collaborative Development Agreement between the Registrant and Merck KGaA, dated
           July 1, 1994.
10.15(+)*  Supply and Distribution Agreement between the Registrant and E. Merck KGaA, dated
           as of June 28, 1994.
10.16(+)*  Research and Development Agreement between the Registrant and Ixsys, Inc., dated
           July 1, 1992.
10.17      Stock Purchase Agreement dated as of October 30, 1991 between the Registrant and
           certain purchasers of Series D Preferred Stock.
10.18      Stock Purchase Agreement dated as of November 25, 1992 between the Registrant and
           Merck KGaA concerning Series E Preferred Stock.
10.19(+)*  Debenture Purchase Agreement between the Registrant and Sandoz Pharma Ltd., dated
           as of September 22, 1995.
10.20(+)*  Settlement and License Agreement & Agreement of Dismissal with Prejudice, dated as
           of September 6, 1996, by and between the Registrant and Abbott Laboratories.
11.1       Statement of computation of earnings per share.
23.1       Consent of Ernst & Young LLP, independent auditors.
23.2       Consent of Pillsbury Madison & Sutro LLP (included in Exhibit 5.1).
24.1       Power of Attorney (see Page II-4).
27.1       Financial Data Schedule.
</TABLE>
 
- ---------------
 *  To be filed by amendment.
 
(+) Confidential treatment requested.

<PAGE>   1
                                2,000,000 Shares*

                        BIOSITE DIAGNOSTICS INCORPORATED

                                  COMMON STOCK

                             UNDERWRITING AGREEMENT


                                                            _____________, 1996

COWEN & COMPANY
ALEX. BROWN & SONS INCORPORATED
  As Representatives of the several Underwriters

c/o Cowen & Company
   Financial Square
   New York, New York 10005

Dear Sirs:

         1. INTRODUCTORY. Biosite Diagnostics Incorporated, a Delaware
corporation (the "Company"), proposes to sell, pursuant to the terms of this
Agreement, to the several underwriters named in Schedule A hereto (the
"Underwriters," or, each, an "Underwriter"), an aggregate of 2,000,000 shares of
Common Stock $0.01 par value (the "Common Stock") of the Company. The aggregate
of 2,000,000 shares so proposed to be sold is hereinafter referred to as the
"Firm Stock." The Company also proposes to sell to the Underwriters, upon the
terms and conditions set forth in Section 3 hereof, up to an additional 300,000
shares of Common Stock (the "Optional Stock"). The Firm Stock and the Optional
Stock are hereinafter collectively referred to as the "Stock." Cowen & Company
("Cowen") and Alex. Brown & Sons Incorporated are acting as representatives of
the several Underwriters and in such capacity are hereinafter referred to as the
"Representatives."

         2. REPRESENTATIONS AND WARRANTIES OF THE COMPANY. The Company
represents and warrants to, and agrees with, the several Underwriters that:

            (a) A registration statement on Form S-1 (File No. 333-___________) 
in the form in which it became or becomes effective and also in such form as it
may be when any post-effective amendment thereto shall become

- --------
* Plus 300,000 shares of Common Stock subject to the over-allotment option
granted to the Representatives pursuant to Section 3.

                                       1.
<PAGE>   2
effective with respect to the Stock, including any preeffective prospectuses
included as part of the registration statement as originally filed or as part of
any amendment or supplement thereto, or filed pursuant to Rule 424 under the
Securities Act of 1933, as amended (the "Securities Act"), and the rules and
regulations (the "Rules and Regulations") of the Securities and Exchange
Commission (the "Commission") thereunder, copies of which have heretofore been
delivered to you, has been carefully prepared by the Company in conformity with
the requirements of the Securities Act and has been filed with the Commission
under the Securities Act; one or more amendments to such registration statement,
including in each case an amended preeffective prospectus, copies of which
amendments have heretofore been delivered to you, have been so prepared and
filed. If it is contemplated, at the time this Agreement is executed, that a
post-effective amendment to the registration statement will be filed and must be
declared effective before the offering of the Stock may commence, the term
"Registration Statement" as used in this Agreement means the registration
statement as amended by said post-effective amendment. The term "Registration
Statement" as used in this Agreement shall also include any registration
statement relating to the Stock that is filed and declared effective pursuant to
Rule 462(b) under the Securities Act. The term "Prospectus" as used in this
Agreement means the prospectus in the form included in the Registration
Statement, or, (A) if the prospectus included in the Registration Statement
omits information in reliance on Rule 430A under the Securities Act and such
information is included in a prospectus filed with the Commission pursuant to
Rule 424(b) under the Securities Act, the term "Prospectus" as used in this
Agreement means the prospectus in the form included in the Registration
Statement as supplemented by the addition of the Rule 430A information contained
in the prospectus filed with the Commission pursuant to Rule 424(b) and (B) if
prospectuses that meet the requirements of Section 10(a) of the Securities Act
are delivered pursuant to Rule 434 under the Securities Act, then (i) the term
"Prospectus" as used in this Agreement means the "prospectus subject to
completion" (as such term is defined in Rule 434(g) under the Securities Act) as
supplemented by (a) the addition of Rule 430A information or other information
contained in the form of prospectus delivered pursuant to Rule 434(b)(2) under
the Securities Act or (b) the information contained in the term sheets described
in Rule 434(b)(3) under the Securities Act, and (ii) the date of such
prospectuses shall be deemed to be the date of the term sheets. The term
"Preeffective Prospectus" as used in this Agreement means the prospectus subject
to completion in the form included in the Registration Statement at the time of
the initial filing of the Registration Statement with the Commission, and as
such prospectus shall have been amended from time to time prior to the date of
the Prospectus.

                  (b) The Commission has not issued or, to the Company's
knowledge threatened to issue any order preventing or suspending the use of any
Preeffective Prospectus, and, at its date of issue, each Preeffective Prospectus
conformed in all material respects with the requirements of the Securities Act
and did not include any statement of a material fact or omit to state a material
fact required to be stated therein or necessary to make the statements therein,
in light of the circumstances under 

                                       2.
<PAGE>   3
which they were made, not misleading other than any such nonconformance or
untrue statement or omission in a Preeffective Prospectus which has been
corrected in the Prospectus; and, when the Registration Statement becomes
effective and at all times subsequent thereto up to and including the Closing
Dates, the Registration Statement and the Prospectus and any amendments or
supplements thereto contained and will contain all material statements and
information required to be included therein by the Securities Act and conformed
and will conform in all material respects to the requirements of the Securities
Act and neither the Registration Statement nor the Prospectus, nor any amendment
or supplement thereto, included or will include any untrue statement of a
material fact or omit to state any material fact required to be stated therein
or necessary to make the statements therein, in light of the circumstances under
which they were made, not misleading; provided, however, that the foregoing
representations, warranties and agreements shall not apply to information
contained in or omitted from any Preeffective Prospectus or the Registration
Statement or the Prospectus or any such amendment or supplement thereto in
reliance upon, and in conformity with, written information furnished to the
Company by or on behalf of any Underwriter, directly or through you,
specifically for use in the preparation thereof; there is no franchise, lease,
contract, agreement or document required to be described in the Registration
Statement or Prospectus or to be filed as an exhibit to the Registration
Statement which is not described or filed therein as required; and all
descriptions of any such franchises, leases, contracts, agreements or documents
contained in the Registration Statement are accurate and complete descriptions
of such documents in all material respects.

                  (c) Subsequent to the respective dates as of which information
is given in the Registration Statement and Prospectus, and except as set forth
or contemplated in the Prospectus, the Company has not incurred any liabilities
or obligations, direct or contingent, nor entered into any transactions not in
the ordinary course of business, and there has not been any material adverse
change in the condition (financial or otherwise), properties, business,
management, prospects, net worth or results of operations of the Company or any
change in the capital stock, short-term or long-term debt of the Company.

                  (d) The financial statements, together with the related notes
and schedules, set forth in the Prospectus and elsewhere in the Registration
Statement fairly present, on the basis stated in the Registration Statement, the
financial position and the results of operations and changes in financial
position of the Company at the respective dates or for the respective periods
therein specified. Such statements and related notes and schedules have been
prepared in accordance with generally accepted accounting principles applied on
a consistent basis except as may be set forth in the Prospectus. The selected
financial and statistical data set forth in the Prospectus under the caption
"Selected Financial Data" fairly present, on the basis stated in the
Registration Statement, the information set forth therein.

                                       3.
<PAGE>   4
                  (e) Ernst & Young LLP, who have expressed their opinions on
the audited financial statements and related schedules included in the
Registration Statement and the Prospectus are independent public accountants as
required by the Securities Act and the Rules and Regulations.

                  (f) The Company has been duly organized and is validly
existing and in good standing as a corporation under the laws of the State of
Delaware, with power and authority (corporate and other) to own or lease its
properties and to conduct its business as described in the Prospectus; the
Company is in possession of and operating in compliance with all franchises,
grants, authorizations, licenses, permits, easements, consents, certificates and
orders required for the conduct of its business, all of which are valid and in
full force and effect or the absence of which would not have a material adverse
effect in the business or financial condition of the Company; and the Company is
duly qualified to do business and in good standing as a foreign corporation in
all other jurisdictions where its ownership or leasing of properties or the
conduct of its business requires such qualification except where the failure to
so qualify would not have a material adverse effect on the business or financial
condition of the Company. Except as described in the Registration Statement, the
Company has all requisite power and authority, and all necessary consents,
approvals, authorizations, orders, registrations, qualifications, licenses and
permits of and from all public regulatory or governmental agencies and bodies to
own, lease and operate its properties and conduct its business as now being
conducted and as described in the Registration Statement and the Prospectus, and
no such consent, approval, authorization, order, registration, qualification,
license or permit contains a materially burdensome restriction not adequately
disclosed in the Registration Statement and the Prospectus.

                  (g) The Company's authorized and outstanding capital stock as
of ______, 1996 is as set forth under the heading "Capitalization" in the
Prospectus; the outstanding shares of common stock of the Company conform to the
description thereof in the Prospectus and have been duly authorized and validly
issued and are fully paid and nonassessable and have been issued in compliance
with all federal and state securities laws and were not issued in violation of
or subject to any preemptive rights or similar rights to subscribe for or
purchase securities and conform to the description thereof contained in the
Prospectus. Except as disclosed in and or contemplated by the Prospectus and the
financial statements of the Company and related notes thereto included in the
Prospectus, the Company does not have outstanding any options or warrants to
purchase, or any preemptive rights or other rights to subscribe for or to
purchase any securities or obligations convertible into, or any contracts or
commitments to issue or sell, shares of its capital stock or any such options,
rights, convertible securities or obligations, except for options granted 
subsequent to the date of information provided in the Prospectus pursuant to the
Company's employee and stock option plans as disclosed in the Prospectus. The 
description of the Company's stock option and other stock plans or arrangements,
and the options or other rights granted or exercised 

                                       4.
<PAGE>   5
thereunder, as set forth in the Prospectus, accurately and fairly presents the
information required to be shown with respect to such plans, arrangements,
options and rights.

                  (h) The Stock to be issued and sold by the Company to the
Underwriters hereunder has been duly and validly authorized and, when issued and
delivered against payment therefor as provided herein, will be duly and validly
issued, fully paid and nonassessable and free of any preemptive or similar
rights and will conform to the description thereof in the Prospectus.

                  (i) Except as set forth in the Prospectus, there are no legal
or governmental proceedings pending to which the Company is a party, which, if
determined adversely to the Company, might individually or in the aggregate (i)
prevent or adversely affect the transactions contemplated by this Agreement,
(ii) suspend the effectiveness of the Registration Statement, (iii) prevent or
suspend the use of the Preeffective Prospectus in any jurisdiction or (iv)
result in a material adverse change in the condition (financial or otherwise),
properties, business, management prospects, net worth or results of operations
of the Company; and to the best of the Company's knowledge no such proceedings
are threatened or contemplated against the Company by governmental authorities
or others. The Company is not a party nor subject to the provisions of any
material injunction, judgment, decree or order of any court, regulatory body or
other governmental agency or body. The description of the Company's litigation
under the heading "Legal Proceedings" in the Prospectus is true and correct and
complies with the Rules and Regulations.

                  (j) The execution, delivery and performance of this Agreement
and the consummation of the transactions herein contemplated will not result in
a breach or violation of any of the terms or provisions of or constitute a
default under any indenture, mortgage, deed of trust, note agreement or other
agreement or instrument to which the Company is a party or by which it or any of
its properties is or may be bound, the Certificate of Incorporation, Bylaws or
other organizational documents of the Company, or any law, order, rule or
regulation of any court or governmental agency or body having jurisdiction over
the Company or any of its properties or will result in the creation of a lien.

                  (k) No consent, approval, authorization or order of any court
or governmental agency or body is required for the consummation by the Company
of the transactions contemplated by this Agreement, except such as may be
required by the National Association of Securities Dealers, Inc. (the "NASD") or
under the Securities Act or the securities or "Blue Sky" laws of any
jurisdiction in connection with the purchase and distribution of the Stock by
the Underwriters.

                  (l) The Company has the full corporate power and authority to 
enter into this Agreement and to perform its obligations hereunder (including 
to issue, sell and


                                       5.
<PAGE>   6
deliver the Stock), and this Agreement has been duly and validly authorized,
executed and delivered by the Company and is a valid and binding obligation of
the Company, enforceable against the Company in accordance with its terms,
except to the extent that rights to indemnity and contribution hereunder may be
limited by federal or state securities laws or the public policy underlying such
laws.

                  (m) The Company is in all material respects in compliance
with, and conducts its businesses in conformity with, all applicable federal,
state, local and foreign laws, rules and regulations or any court or
governmental agency or body including, without limitation, those of the United
States Food and Drug Administration (the "FDA"), except where the failure to be
so in compliance would not materially adversely affect the financial position,
business or operations of the Company; to the knowledge of the Company,
otherwise than as set forth in the Registration Statement and the Prospectus, no
prospective change in any of such federal, state, local or foreign laws, rules
or regulations has been adopted which, when made effective, would have a
material adverse effect on the operations of the Company. In the ordinary course
of business, employees of the Company conduct periodic reviews of the effect of
Environmental Laws (as defined below) on the business operations and properties
of the Company, in the ordinary course of which they seek to identify and
evaluate associated costs and liabilities. Except as disclosed in the
Registration Statement, the Company is in compliance with all applicable
existing federal, state, local and foreign laws and regulations relating to the
protection of human health or the environment or imposing liability or requiring
standards of conduct concerning any Hazardous Materials ("Environmental Laws"),
except for such instances of noncompliance which, either singly or in the
aggregate, would not have a material adverse effect. The term "Hazardous
Material" means (i) any "hazardous substance" as defined by the Comprehensive
Environmental Response, Compensation and Liability Act of 1980, as amended, (ii)
any "hazardous waste" as defined by the Resource Conservation and Recovery Act,
as amended, (iii) any petroleum or petroleum product, (iv) any polychlorinated
biphenyl and (v) any pollutant or contaminant or hazardous, dangerous or toxic
chemical, material, waste or substance regulated under or within the meaning of
any other Environmental Law.

                  (n) The Company has filed all necessary federal, state, local
and foreign income, payroll, franchise and other tax returns and has paid all
taxes shown as due thereon or with respect to any of its properties, and there
is no tax deficiency that has been, or to the knowledge of the Company is likely
to be, asserted against the Company or any of its properties or assets that
would adversely affect the financial position, business or operations of the
Company.

                  (o) Except as set forth in the Registration Statement, no 
person or entity has the right to require registration of shares of Common 
Stock or other securities of the Company because of the filing or effectiveness
of the Registration Statement or otherwise, except for persons and entities who
have expressly waived such right or who 


                                       6.
<PAGE>   7
have been given proper notice and have failed to exercise such right within the
time or times required under the terms and conditions of such right.

                  (p) The Company has not taken and will not take, directly or
indirectly, any action designed or intended to stabilize or manipulate the price
of any security of the Company, or which caused or resulted in, or which might
in the future reasonably be expected to cause or result in, stabilization or
manipulation of the price of any security of the Company.

                  (q) The Company has provided you with all financial statements
since [_______, 1996] to the date hereof that are available to the officers of
the Company, including financial statements for the months of [______ and
_______ of 1996].

                  (r) The Company owns or possesses all patents, trademarks,
trademark registrations, service marks, service mark registrations, tradenames,
copyrights, licenses, inventions, trade secrets and rights described in the
Prospectus as being owned by it or necessary for the conduct of its business,
and except as disclosed in the Registration Statement, the Company is not aware
of any claim to the contrary or any challenge by any other person to the rights
of the Company with respect to the foregoing. Except as disclosed in the
Registration Statement, the Company's business as now conducted and as proposed
to be conducted does not and will not infringe or conflict with in any material
respect patents, trademarks, service marks, trade names, copyrights, trade
secrets, licenses or other intellectual property or franchise right of any
person. Except as described in the Prospectus, no claim has been made against
the Company alleging the infringement by the Company of any patent, trademark,
service mark, tradename, copyright, trade secret, license in or other
intellectual property right or franchise right of any person and the Company has
no knowledge of such infringement. To the best of the Company's knowledge, no
U.S. patent issued to date is or would be infringed by the activities of the
Company in the manufacture, use or sale of any product as described in the
Registration Statement and Prospectus.

                  (s) The Company has performed all material obligations
required to be performed by it under all contracts required by Item 601(b)(10)
of Regulation S-K under the Securities Act to be filed as exhibits to the
Registration Statement, and neither the Company nor to the Company's knowledge,
any other party to such contract is in default under or in breach of any such
obligations. The Company has not received any notice of such default or breach.

                  (t) The Company is not involved in any labor dispute nor, 
to the Company's knowledge, is any such dispute threatened. The Company is not 
aware that (A) any executive, key employee or significant group of employees of
the Company plans to terminate employment with the Company or (B) any such 
executive or key employee is subject to any noncompete, nondisclosure, 
confidentiality, employment, consulting or 

                                       7.
<PAGE>   8
similar agreement that would be violated by the present or proposed business
activities of the Company. The Company does not have or expect to have any
liability for any prohibited transaction or funding deficiency or any complete
or partial withdrawal liability with respect to any pension, profit sharing or
other plan which is subject to the Employee Retirement Income Security Act of
1974, as amended ("ERISA"), to which the Company makes or ever has made a
contribution and in which any employee of the Company is or has ever been a
participant. With respect to such plans, the Company is in compliance in all
material respects with all applicable provisions of ERISA.

                  (u) The Company has obtained the written agreement described
in Section 8(m) of this Agreement from each of its officers, directors and
holders of Common Stock listed on Schedule B hereto.

                  (v) The Company has, and the Company as of the Closing Dates
will have, good and marketable title to all real property and good and
marketable title to all personal property owned or proposed to be owned by it
which is material to the business of the Company, in each case free and clear of
all liens, encumbrances and defects except such as are described the Prospectus
or such as would not have a material adverse effect on the Company; and any real
property and buildings held under lease by the Company or proposed to be held
after giving effect to the transactions described in the Prospectus are, or will
be as of the Closing Dates, held by it under valid, subsisting and enforceable
leases with such exceptions as would not have a material adverse effect on the
Company, in each case except as described in or contemplated by the Prospectus.

                  (w) The Company is insured by insurers of recognized financial
responsibility against such losses and risks and in such amounts as are
customary in the businesses in which it is engaged or proposes to engage after
giving effect to the transactions described in the Prospectus; and the Company
does not have any reason to believe that it will not be able to renew its
existing insurance coverage as and when such coverage expires or to obtain
similar coverage from similar insurers as may be necessary to continue its
business at a cost that would not materially and adversely affect the condition,
financial or otherwise, or the earnings, business or operations of the Company,
except as described in or contemplated by the Prospectus.

                  (x)      Other than as contemplated by this Agreement, there 
is no broker, finder or other party that is entitled to receive from the 
Company any brokerage or finder's fee or other fee or commission as a result of
any of the transactions contemplated by this Agreement.

                  (y) The Company has complied with all provisions of Section
517.075 Florida Statutes (Chapter 92-198; Laws of Florida).

                                       8.
<PAGE>   9
                  (z) The Company maintains a system of internal accounting
controls sufficient to provide reasonable assurances that (i) transactions are
executed in accordance with management's general or specific authorization; (ii)
transactions are recorded as necessary to permit preparation of financial
statements in conformity with generally accepted accounting principles and to
maintain accountability for assets; (iii) access to assets is permitted only in
accordance with management's general or specific authorization; and (iv) the
recorded accountability for assets is compared with existing assets at
reasonable intervals and appropriate action is taken with respect to any
differences.

                  (aa) To the Company's knowledge, neither the Company nor any
employee or agent of the Company has made any payment of funds of the Company or
received or retained any funds in violation of any law, rule or regulation,
which payment, receipt or retention of funds is of a character required to be
disclosed in the Prospectus.

                  (bb) The Company is not an "investment company" or an entity
"controlled" by an "investment company" as such terms are defined in the
Investment Company Act of 1940, as amended and the Company intends in the future
to conduct its business in a manner that will not result in either such
classification under such Act.

                  (cc) Each certificate signed by any officer of the Company and
delivered to the Underwriters or counsel for the Underwriters shall be deemed to
be a representation and warranty by the Company as to the matters covered
thereby.

         3. PURCHASE BY, AND SALE AND DELIVERY TO, UNDERWRITERS; CLOSING DATES.
On the basis of the representations, warranties, covenants and agreements herein
contained, but subject to the terms and conditions herein set forth, the Company
agrees to sell to the Underwriters and the Underwriters agree, severally and not
jointly, to purchase the Firm Stock, the number of shares of Firm Stock to be
purchased by each Underwriter being set opposite its name in Schedule A, subject
to adjustment in accordance with Section 12 hereof.

         The purchase price per share to be paid by the Underwriters to the
Company will be $_____ per share (the "Purchase Price").

         The Company will deliver the Firm Stock to the Representatives for the
respective accounts of the several Underwriters (in the form of definitive
certificates, issued in such names and in such denominations as the
Representatives may direct by notice in writing to the Company given at or prior
to 12:00 Noon, New York Time, on the second full business day preceding the
First Closing Date (as defined below) or, if no such direction is received, in
the names of the respective Underwriters or in such other names as Cowen may
designate (solely for the purpose of administrative convenience and in such
denominations as Cowen may determine), against payment of the aggregate Purchase


                                       9.
<PAGE>   10
Price therefor wire transfer to such account as the Company shall designate. The
time and date of the delivery and closing shall be at 10:00 A.M., New York Time,
on [         , 1996], in accordance with Rule 15c6-1 of the Exchange Act. The
time and date of such payment and delivery are herein referred to as the "First
Closing Date". The Closing Date and the location of delivery of, and the form
of payment for, the Firm Stock may be varied by agreement between the Company
and Cowen. The Closing Date may be postponed pursuant to the provisions of 
Section 12.

         The Company shall make the certificates for the Stock available to the
Representatives for examination on behalf of the Underwriters not later than
10:00 A.M., New York Time, on the business day preceding the First Closing Date
at the offices of Cowen, Financial Square, New York, New York 10005.

         It is understood that Cowen or Alex. Brown & Sons Incorporated,
individually and not as Representatives of the several Underwriters, may (but
shall not be obligated to) make payment to the Company on behalf of any
Underwriter or Underwriters, for the Stock to be purchased by such Underwriter
or Underwriters. Any such payment by Cowen or Alex. Brown & Sons Incorporated
shall not relieve such Underwriter or Underwriters from any of its or their
other obligations hereunder.

         The several Underwriters agree to make an initial public offering of
the Firm Stock at the initial public offering price as soon after the
effectiveness of the Registration Statement as in their judgment is advisable.
The Representatives shall promptly advise the Company of the making of the
initial public offering.

         For the purpose of covering any over-allotments in connection with the
distribution and sale of the Firm Stock as contemplated by the Prospectus, the
Company hereby grants to the Underwriters an option to purchase, severally and
not jointly, up to [______] shares of Optional Stock. The price per share to be
paid for the Optional Stock shall be the Purchase Price. The option granted
hereby may be exercised as to all or any part of the Optional Stock at any time,
and from time to time, not more than thirty (30) days subsequent to the
effective date of this Agreement. No Optional Stock shall be sold and delivered
unless the Firm Stock previously has been, or simultaneously is, sold and
delivered. The right to purchase the Optional Stock or any portion thereof may
be surrendered and terminated at any time upon notice by the Underwriters to the
Company.


         The option granted hereby may be exercised by the Underwriters by
giving written notice from Cowen to the Company setting forth the number of
shares of the Optional Stock to be purchased by them and the date and time for
delivery of and payment for the Optional Stock. Each date and time for delivery
of and payment for the Optional Stock (which may be the First Closing Date, but
not earlier) is herein called the "Option Closing Date" and shall in no event be
earlier than two (2) business days nor later than ten (10) business days after
written notice is given. (The Option Closing Date and the

                                      10.
<PAGE>   11
First Closing Date are herein called the "Closing Dates".) All purchases of
Optional Stock from the Company shall be made on a pro rata basis. Optional
Stock shall be purchased for the account of each Underwriter in the same
proportion as the number of shares of Firm Stock set forth opposite such
Underwriter's name in Schedule A hereto bears to the total number of shares of
Firm Stock (subject to adjustment by the Underwriters to eliminate odd lots).
Upon exercise of the option by the Underwriters, the Company agrees to sell to
the Underwriters the number of shares of Optional Stock set forth in the written
notice of exercise and the Underwriters agree, severally and not jointly, and
subject to the terms and conditions herein set forth, to purchase the number of
such shares determined as aforesaid.

         The Company will deliver the Optional Stock to the Underwriters (in the
form of definitive certificates, issued in such names and in such denominations
as the Representatives may direct by notice in writing to the Company given at
or prior to 12:00 Noon, New York Time, on the second full business day preceding
the Option Closing Date or, if no such direction is received, in the names of
the respective Underwriters or in such other names as Cowen may designate
(solely for the purpose of administrative convenience) and in such denominations
as Cowen may determine, against payment of the aggregate Purchase Price therefor
wire transfer to such account as the Company shall designate. The Company shall
make the certificates for the Optional Stock available to the Underwriters for
examination not later than 10:00 A.M., New York Time, on the business day
preceding the Option Closing Date at the offices of Cowen, Financial Square, New
York, New York 10005. The Option Closing Date and the location of delivery of,
and the form of payment for, the Option Stock may be varied by agreement between
the Company and Cowen. The Option Closing Date may be postponed pursuant to the
provisions of Section 12.

         4. COVENANTS AND AGREEMENTS OF THE COMPANY. The Company covenants and
agrees with the several Underwriters that:

            (a) The Company will (i) if the Company and the Representatives 
have determined not to proceed pursuant to Rule 430A, use its best efforts to 
cause the Registration Statement to become effective, (ii) if the Company and 
the Representatives have determined to proceed pursuant to Rule 430A, use its 
best efforts to comply with the provisions of and make all requisite filings 
with the Commission pursuant to Rule 430A and Rule 424 of the Rules and 
Regulations and (iii) if the Company and the Representatives have determined to
deliver Prospectuses pursuant to Rule 434 of the Rules and Regulations, to use
its best efforts to comply with all the applicable provisions thereof. The
Company will advise the Representatives promptly as to the time at which the
Registration Statement becomes effective, will advise the Representatives
promptly of the issuance by the Commission of any stop order suspending the
effectiveness of the Registration Statement or of the institution of any
proceedings for that purpose, and will use its best efforts to prevent the
issuance of any such stop order and to obtain as soon as


                                      11.
<PAGE>   12
possible the lifting thereof, if issued. The Company will advise the
Representatives promptly of the receipt of any comments of the Commission or any
request by the Commission for any amendment of or supplement to the Registration
Statement or the Prospectus or for additional information and will not at any
time file any amendment to the Registration Statement or supplement to the
Prospectus which shall not previously have been submitted to the Representatives
a reasonable time prior to the proposed filing thereof or to which the
Representatives shall reasonably object in writing or which is not in compliance
with the Securities Act and the Rules and Regulations.

                  (b) The Company will prepare and file with the Commission,
promptly upon the request of the Representatives, any amendments or supplements
to the Registration Statement or the Prospectus which in the opinion of the
Representatives may be necessary to enable the several Underwriters to continue
the distribution of the Stock and will use its best efforts to cause the same to
become effective as promptly as possible.

                  (c) If at any time after the effective date of the
Registration Statement when a prospectus relating to the Stock is required to be
delivered under the Securities Act any event relating to or affecting the
Company occurs as a result of which the Prospectus or any other prospectus as
then in effect would include an untrue statement of a material fact, or omit to
state any material fact necessary to make the statements therein, in light of
the circumstances under which they were made, not misleading, or if it is
necessary at any time to amend the Prospectus to comply with the Securities Act,
the Company will promptly notify the Representatives thereof and will prepare an
amended or supplemented prospectus which will correct such statement or
omission; and in case any Underwriter is required to deliver a prospectus
relating to the Stock nine (9) months or more after the effective date of the
Registration Statement, the Company upon the request of the Representatives and
at the expense of such Underwriter will prepare promptly such prospectus or
prospectuses as may be necessary to permit compliance with the requirements of
Section 10(a)(3) of the Securities Act.

                  (d) The Company will deliver to the Representatives, at or
before the Closing Dates, signed copies of the Registration Statement, as
originally filed with the Commission, and all amendments thereto including all
financial statements and exhibits thereto, and will deliver to the
Representatives such number of copies of the Registration Statement, including
such financial statements but without exhibits, and all amendments thereto, as
the Representatives may reasonably request. The Company will deliver or mail to
or upon the order of the Representatives, from time to time until the effective
date of the Registration Statement, as many copies of the Preeffective
Prospectus as the Representatives may reasonably request. The Company will
deliver or mail to or upon the order of the Representatives on the date of the
initial public offering, and thereafter from time to time during the period when
delivery of a prospectus relating to the Stock is required under the Securities
Act, as many copies of the Prospectus, in final form or as thereafter amended or
supplemented as the Representatives may reasonably request;


                                      12.
<PAGE>   13
provided, however, that the expense of the preparation and delivery of any
prospectus required for use nine (9) months or more after the effective date of
the Registration Statement shall be borne by the Underwriters required to
deliver such prospectus.

                  (e) The Company will make generally available to its
shareholders as soon as practicable, but not later than fifteen (15) months
after the effective date of the Registration Statement, an earnings statement
which will be in reasonable detail (but which need not be audited) and which
will comply with Section 11(a) of the Securities Act, covering a period of at
least twelve (12) months beginning after the "effective date" (as defined in
Rule 158 under the Securities Act) of the Registration Statement.

                  (f) The Company will cooperate with the Representatives to
enable the Stock to be registered or qualified for offering and sale by the
Underwriters and by dealers under the securities laws of such jurisdictions as
the Representatives may designate and at the request of the Representatives will
make such applications and furnish such consents to service of process or other
documents as may be required of it as the issuer of the Stock for that purpose;
provided, however, that the Company shall not be required to qualify to do
business or to file a general consent (other than that arising out of the
offering or sale of the Stock) to service of process in any such jurisdiction
where it is not now so subject. The Company will, from time to time, prepare and
file such statements and reports as are or may be required of it as the issuer
of the Stock to continue such qualifications in effect for so long a period as
the Representatives may reasonably request for the distribution of the Stock.
The Company will advise the Representatives promptly after the Company becomes
aware of the suspension of the qualifications or registration of (or any such
exception relating to) the Common Stock of the Company for offering, sale or
trading in any jurisdiction or of any initiation or threat of any proceeding for
any such purpose, and in the event of the issuance of any orders suspending such
qualifications, registration or exception, the Company will, with the
cooperation of the Representatives use its best efforts to obtain the withdrawal
thereof.

                  (g) The Company will furnish to its shareholders annual
reports containing financial statements certified by independent public
accountants and with quarterly summary financial information in reasonable
detail which may be unaudited. During the period of five (5) years from the date
hereof, the Company will deliver to the Representatives and, upon request, to
each of the other Underwriters, as soon as they are available, copies of each
annual report of the Company and each other report furnished by the Company to
its shareholders and will deliver to the Representatives, (i) as soon as they
are available, copies of any other reports (financial or other) which the
Company shall publish or otherwise make available to any of its shareholders as
such, (ii) as soon as they are available, copies of any reports and financial
statements furnished to or filed with the Commission or any national securities
exchange and (iii) from time to time such other information concerning the
Company as you may request.


                                      13.
<PAGE>   14
                  (h) The Company will use its best efforts to list, subject to
official notice of issuance, on the Nasdaq National Market, the Stock to be
issued and sold by the Company.

                  (i) The Company will maintain a transfer agent and registrar 
for its Common Stock.

                  (j) For a period of one year after the date hereof, prior to
filing its quarterly statements on Form 10-Q, the Company will have its
independent auditors perform a limited quarterly review of its quarterly
numbers.

                  (k) The Company will not offer, sell, assign, transfer,
encumber, contract to sell, grant an option to purchase or otherwise dispose of
any shares of Common Stock or securities convertible into or exercisable or
exchangeable for Common Stock (including, without limitation, Common Stock of
the Company which may be deemed to be beneficially owned by the undersigned in
accordance with the Rules and Regulations) during the one hundred eighty (180)
days following the date on which the price of the Common Stock to be purchased
by the Underwriters is set, other than the Company's sale of Common Stock
hereunder and the Company's issuance of Common Stock upon the exercise of
warrants and stock options which are presently outstanding and described in the
Prospectus or pursuant to the Company's stock plans which are described in the
Prospectus.

                  (l) The Company will apply the net proceeds from the sale of
the Stock as set forth in the description under "Use of Proceeds" in the
Prospectus, which description complies in all respects with the requirements of
Item 504 of Regulation S-K.

                  (m) The Company will supply you with copies of all
correspondence to and from, and all documents issued to and by, the Commission
in connection with the registration of the Stock under the Securities Act, and
the NASD in connection with the listing of the stock on the Nasdaq National
Market.

                  (n) Prior to the Closing Dates the Company will furnish to 
you, as soon as they have been prepared, copies of any unaudited interim
consolidated financial statements of the Company for any periods subsequent to
the periods covered by the financial statements appearing in the Registration
Statement and the Prospectus.

                  (o) Prior to the Closing Dates the Company will issue no press
release or other communications directly or indirectly and hold no press
conference with respect to the Company, the financial condition, results of
operation, business, prospects, assets or liabilities of the Company, or the
offering of the Stock, without your prior written consent, which shall not be
unreasonably withheld. If at any time during the 30-day period after the
Registration Statement becomes effective, any rumor, publication or event
relating to or affecting the Company shall occur as a result of which in your


                                      14.
<PAGE>   15
opinion the market price of the Common Shares has been or is likely to be
affected materially (regardless of whether such rumor, publication or event
necessitates a supplement to or amendment of the Prospectus), the Company will,
after notice from you, which is subsequently confirmed in writing, advising the
Company to the effect set forth above, forthwith, if appropriate, prepare,
consult with you concerning the substance and, subject to its obligations under
applicable law, disseminate a press release or other public statement,
reasonably satisfactory to you and the Company's counsel, responding to or
commenting on such rumor, publications or event.

                  (p) During the period of five (5) years hereafter, the Company
will furnish to the Representatives, and upon request of the Representatives, to
each of the Underwriters: (i) as soon as practicable after the end of each
fiscal year, copies of the Annual Report of the Company containing the balance
sheet of the Company as of the close of such fiscal year and statements of
income, stockholder's equity and cash flows for the year then ended and the
opinion thereon of the Company's independent public accountants; (ii) as soon as
practicable after the filing thereof, copies of each proxy statement, Annual
Report on Form 10-K, Quarterly Report on Form 10-Q, Report on Form 8-K or other
report filed by the Company with the Commission, or the NASD or any securities
exchange; and (iii) as soon as available, copies of any report or communication
of the Company mailed generally to holders of its Common Stock.

         5. PAYMENT OF EXPENSES. (a) The Company will pay (directly or by
reimbursement) all costs, fees and expenses incurred in connection with expenses
incident to the performance of its obligations under this Agreement and in
connection with the transactions contemplated hereby, including but not limited
to (i) all expenses and taxes incident to the issuance and delivery of the Stock
to the Representatives; (ii) all expenses incident to the registration of the
Stock under the Securities Act; (iii) the costs of preparing stock certificates
(including printing and engraving costs); (iv) all fees and expenses of the
registrar and transfer agent of the Stock; (v) all necessary issue, transfer and
other stamp taxes in connection with the issuance and sale of the Stock to the
Underwriters; (vi) fees and expenses of the Company's counsel and the Company's
independent accountants; (vii) all costs and expenses incurred in connection
with the preparation, printing filing, shipping and distribution of the
Registration Statement, each Preeffective Prospectus and the Prospectus
(including all exhibits and financial statements) and all amendments and
supplements provided for herein, the "Agreement Among Underwriters" between the
Representatives and the Underwriters, the Master Selected Dealers' Agreement,
the Underwriters' Questionnaire and the Blue Sky memoranda and this Agreement;
(viii) all filing fees, attorneys' fees and expenses incurred by the Company or
the Underwriters in connection with exemptions from the qualifying or
registering (or obtaining qualification or registration of) all or any part of
the Stock for offer and sale and determination of its eligibility for investment
under the Blue Sky or other securities laws of such jurisdictions as the
Representatives may designate; (ix) all fees and expenses paid or incurred in
connection with filings made with 

                                      15.
<PAGE>   16
the NASD; and (x) all other costs and expenses incident to the performance of
its obligations hereunder which are not otherwise specifically provided for in
this Section.

                  (b) In addition to its other obligations under Section 6(a)
hereof, the Company agrees that, as an interim measure during the pendency of
any claim, action, investigation, inquiry or other proceeding arising out of or
based upon (i) any statement or omission or any alleged statement or omission or
(ii) any breach or inaccuracy in its representations and warranties, it will
reimburse each Underwriter (and, to the extent applicable, each other
Underwriter Indemnified Party (as defined in Section 6(a) below)) on a quarterly
basis for all reasonable legal or other expenses incurred in connection with
investigating or defending any such claim, action, investigation, inquiry or
other proceeding, notwithstanding the absence of a judicial determination as to
the propriety and enforceability of the Company's obligation to reimburse each
Underwriter (and, to the extent applicable, each other Underwriter Indemnified
Party) for such expenses and the possibility that such payments might later be
held to have been improper by a court of competent jurisdiction. To the extent
that any such interim reimbursement payment is so held to have been improper,
each Underwriter (and, to the extent applicable, each other Underwriter
Indemnified Party) shall promptly return it to the Company together with
interest, compounded daily, determined on the basis of the prime rate (or other
commercial lending rate for borrowers of the highest credit standing) announced
from time to time by Chemical Bank, New York, New York (the "Prime Rate"). Any
such interim reimbursement payments that are not made to an Underwriter (and, to
the extent applicable, each other Underwriter Indemnified Party) in a timely
manner as provided below shall bear interest at the Prime Rate from the due date
for such reimbursement. This expense reimbursement agreement will be in addition
to any other liability that the Company may otherwise have.

                  (c) In addition to its other obligations under Section 6(b)
hereof, each Underwriter severally agrees that, as an interim measure during the
pendency of any claim, action, investigation, inquiry or other proceeding
arising out of or based upon any statement or omission, or any alleged statement
or omission, described in Section 6(b) hereof which relates to information
furnished by any of the Underwriters to the Company for use in connection with
the preparation of the Registration Statement and the Prospectus, it will
reimburse the Company (and, to the extent applicable, each other Company
Indemnified Party (as defined in Section 6(b) below)) on a quarterly basis for
all reasonable legal or other expenses incurred in connection with investigating
or defending any such claim, action, investigation, inquiry or other proceeding,
notwithstanding the absence of a judicial determination as to the propriety and
enforceability of the Underwriters' obligation to reimburse the Company (and, to
the extent applicable, each other Company Indemnified Party) for such expenses
and the possibility that such payments might later be held to have been improper
by a court of competent jurisdiction. To the extent that any such interim
reimbursement payment is so held to have been improper, the Company (and, to the
extent applicable, each other


                                      16.
<PAGE>   17
Company Indemnified Party) shall promptly return it to the Underwriters together
with interest, compounded daily, determined on the basis of the Prime Rate. Any
such interim reimbursement payments which are not made to the Company within
thirty (30) days of a request for reimbursement shall bear interest at the Prime
Rate from the date of such request. This indemnity agreement will be in addition
to any liability which such Underwriter may otherwise have.

                  (d) It is agreed that any controversy arising out of the
operation of the interim reimbursement arrangements set forth in paragraph (b)
and/or (c) of this Section 5, including the amounts of any requested
reimbursement payments and the method of determining such amounts, shall be
settled by arbitration conducted under the provisions of the Constitution and
Rules of the Board of Governors of the New York Stock Exchange, Inc. or pursuant
to the Code of Arbitration Procedure of the NASD. Any such arbitration must be
commenced by service of a written demand for arbitration or written notice of
intention to arbitrate, therein electing the arbitration tribunal. In the event
the party demanding arbitration does not make such designation of an arbitration
tribunal in such demand or notice, then the party responding to said demand or
notice is authorized to do so. Such an arbitration would be limited to the
operation of the interim reimbursement provisions contained in paragraph (b)
and/or (c) of this Section 5 and would not resolve the ultimate propriety or
enforceability of the obligation to reimburse expenses which is created by the
provisions of Section 6.

         6. INDEMNIFICATION AND CONTRIBUTION.

            (a) The Company agrees to indemnify and hold harmless each
Underwriter and each person, if any, who controls such Underwriter within the
meaning of the Securities Act and the respective officers, directors, partners,
employees, representatives and agents of each of such Underwriter (collectively,
the "Underwriter Indemnified Parties" and, each, an "Underwriter Indemnified
Party"), against any losses, claims, damages, liabilities or expenses
(including, unless the Company elects to assume the defense, the reasonable cost
of investigating and defending against any claims therefor and counsel fees
incurred in connection therewith), joint or several, which arise out of or are
based in whole or in part upon the Securities Act, or any other federal, state,
local or foreign statute or regulation or at common law, on the ground or
alleged ground that any Preeffective Prospectus, the Registration Statement or
the Prospectus (or any Preeffective Prospectus, the Registration Statement or
the Prospectus as from time to time amended or supplemented) includes an untrue
statement of a material fact or omits to state a material fact required to be
stated therein or necessary in order to make the statements therein, in light of
the circumstances in which they were made, not misleading, unless such statement
or omission was made in reliance upon, and in conformity with, written
information furnished to the Company by any Underwriter, directly or through the
Representatives, specifically for use in the preparation thereof; provided that,
with respect to any untrue statement or omission or alleged untrue statement or
omission made in any


                                      17.
<PAGE>   18
Preeffective Prospectus, the indemnity agreement contained in this subsection
(a) shall not inure to the benefit of any Underwriter Indemnified Party from
whom the person asserting any such losses, claims, damages or liabilities
purchased the shares of Stock concerned to the extent that any such loss, claim,
damage or liability of such Underwriter Indemnified Party results from the fact
that a copy of the Prospectus was not sent or given to such person at or prior
to the written confirmation of the sale of such shares of Stock to such person
as required by the Securities Act and if the untrue statement or omission
concerned has been corrected in the Prospectus. The Company will be entitled to
participate at its own expense in the defense or, if it so elects, to assume the
defense of any suit brought to enforce any such liability, but if the Company
elects to assume the defense, such defense shall be conducted by counsel chosen
by it. In the event the Company elects to assume the defense of any such suit
and retain such counsel, any Underwriter Indemnified Parties, defendant or
defendants in the suit, may retain additional counsel but shall bear the fees
and expenses of such counsel unless (i) the Company shall have specifically
authorized the retaining of such counsel or (ii) the parties to such suit
include any such Underwriter Indemnified Parties, and the Company and such
Underwriter Indemnified Parties at law or in equity have been advised by counsel
to the Underwriters that one or more legal defenses may be available to it or
them which may not be available to the Company, in which case the Company shall
not be entitled to assume the defense of such suit notwithstanding its
obligation to bear the fees and expenses of such counsel. This indemnity
agreement is not exclusive and will be in addition to any liability which the
Company might otherwise have and shall not limit any rights or remedies which
may otherwise be available at law or in equity to each Underwriter Indemnified
Party.

               (b) Each Underwriter severally agrees to indemnify and hold 
harmless the Company, each of its directors, each of its officers who have
signed the Registration Statement and each person, if any, who controls the
Company within the meaning of the Securities Act (collectively, the "Company
Indemnified Parties") against any losses, claims, damages, liabilities or
expenses (including, unless the Underwriter or Underwriters elect to assume the
defense, the reasonable cost of investigating and defending against any claims
therefor and counsel fees incurred in connection therewith), joint or several,
which arise out of or are based in whole or in part upon the Securities Act or
any other federal, state, local or foreign statute or regulation, or at common
law, on the ground or alleged ground that any Preeffective Prospectus, the
Registration Statement or the Prospectus (or any Preeffective Prospectus, the
Registration Statement or the Prospectus, as from time to time amended or
supplemented) includes an untrue statement of a material fact or omits to state
a material fact required to be stated therein or necessary in order to make the
statements therein, in light of the circumstances in which they were made, not
misleading, but only insofar as any such statement or omission was made in
reliance upon, and in conformity with, written information furnished to the
Company by such Underwriter, directly or through the Representatives,
specifically for use in the preparation thereof; provided, however, that in no
case is such Underwriter to 


                                      18.
<PAGE>   19
be liable with respect to any claims made against any Company Indemnified Party
against whom the action is brought unless such Company Indemnified Party shall
have notified such Underwriter in writing within a reasonable time after the
summons or other first legal process giving information of the nature of the
claim shall have been served upon the Company Indemnified Party, but failure to
notify such Underwriter of such claim shall not relieve it from any liability
which it may have to any Company Indemnified Party otherwise than on account of
its indemnity agreement contained in this paragraph. Such Underwriter shall be
entitled to participate at its own expense in the defense, or, if it so elects,
to assume the defense of any suit brought to enforce any such liability, but, if
such Underwriter elects to assume the defense, such defense shall be conducted
by counsel chosen by it. In the event that any Underwriter elects to assume the
defense of any such suit and retain such counsel, the Company Indemnified
Parties and any other Underwriter or Underwriters or controlling person or
persons, defendant or defendants in the suit, shall bear the fees and expenses
of any additional counsel retained by them, respectively. The Underwriter
against whom indemnity may be sought shall not be liable to indemnify any person
for any settlement of any such claim effected without such Underwriter's
consent. This indemnity agreement is not exclusive and will be in addition to
any liability which such Underwriter might otherwise have and shall not limit
any rights or remedies which may otherwise be available at law or in equity to
any Company Indemnified Party.

                  (c) If the indemnification provided for in this Section 6 is
unavailable or insufficient to hold harmless an indemnified party under
subsection (a) or (b) above in respect of any losses, claims, damages,
liabilities or expenses (or actions in respect thereof) referred to herein, then
each indemnifying party shall contribute to the amount paid or payable by such
indemnified party as a result of such losses, claims, damages, liabilities or
expenses (or actions in respect thereof) in such proportion as is appropriate
to reflect the relative benefits received by the Company on the one hand and the
Underwriters on the other from the offering of the Stock. If, however, the
allocation provided by the immediately preceding sentence is not permitted by
applicable law, then each indemnifying party shall contribute to such amount
paid or payable by such indemnified party in such proportion as is appropriate
to reflect not only such relative benefits but also the relative fault of the
Company on the one hand and the Underwriters on the other in connection with the
statements or omissions which resulted in such losses, claims, damages,
liabilities or expenses (or actions in respect thereof), as well as any other
relevant equitable considerations. The relative benefits received by the Company
on the one hand and the Underwriters on the other shall be deemed to be in the
same proportion as the total net proceeds from the offering (before deducting
expenses) received by the Company bears to the total underwriting discounts and
commissions received by the Underwriters, in each case as set forth in the table
on the cover page of the Prospectus. The relative fault shall be determined by
reference to, among other things, whether the untrue or alleged untrue statement
of a material fact or the omission or alleged omission to state a material fact
relates to information supplied by the 




                                       19.
<PAGE>   20
Company or the Underwriters and the parties' relative intent, knowledge, access
to information and opportunity to correct or prevent such statement or omission.
The Company and the Underwriters agree that it would not be just and equitable
if contribution were determined by pro rata allocation (even if the Underwriters
were treated as one entity for such purpose) or by any other method of
allocation which does not take account of the equitable considerations referred
to above. The amount paid or payable by an indemnified party as a result of the
losses, claims, damages, liabilities or expenses (or actions in respect thereof)
referred to above shall be deemed to include any legal or other expenses
reasonably incurred by such indemnified party in connection with investigating,
defending, settling or compromising any such claim. Notwithstanding the
provisions of this subsection (c), no Underwriter shall be required to
contribute any amount in excess of the amount by which the total price at which
the shares of the Stock underwritten by it and distributed to the public were
offered to the public exceeds the amount of any damages which such Underwriter
has otherwise been required to pay by reason of such untrue or alleged untrue
statement or omission or alleged omission. The Underwriters' obligations to
contribute are several in proportion to their respective underwriting
obligations and not joint. No person guilty of fraudulent misrepresentation
(within the meaning of Section 11(f) of the Securities Act) shall be entitled to
contribution from any person who was not guilty of such fraudulent
misrepresentation.

         7. SURVIVAL OF INDEMNITIES, REPRESENTATIONS, WARRANTIES, ETC. The
respective indemnities, covenants, agreements, representations, warranties and
other statements of the Company and the several Underwriters, as set forth in
this Agreement or made by them respectively, pursuant to this Agreement, shall
remain in full force and effect, regardless of any investigation made by or on
behalf of any Underwriter, the Company or any of its officers or directors or
any controlling person, and shall survive delivery of and payment for the Stock.

         8. CONDITIONS OF UNDERWRITERS' OBLIGATIONS. The respective obligations
of the several Underwriters hereunder shall be subject to the accuracy, at and
(except as otherwise stated herein) as of the date hereof and at and as of the
Closing Dates, of the representations and warranties made herein by the Company,
to compliance at and as of the Closing Dates by the Company with its covenants
and agreements herein contained and other provisions hereof to be satisfied at
or prior to the Closing Dates, and to the following additional conditions:

            (a) The Registration Statement shall have become effective and no 
stop order suspending the effectiveness thereof shall have been issued and no
proceedings for that purpose shall have been initiated or, to the knowledge of
the Company or the Representatives, shall be threatened by the Commission, and
any request for additional information on the part of the Commission (to be
included in the Registration Statement or the Prospectus or otherwise) shall
have been complied with to the reasonable satisfaction of the Representatives.
Any filings of the Prospectus, or any supplement


                                      20.
<PAGE>   21
thereto, required pursuant to Rule 424(b) or Rule 434 of the Rules and
Regulations, shall have been made in the manner and within the time period
required by Rule 424(b) and Rule 434 of the Rules and Regulations, as the case
may be.

              (b) The Representatives shall have been satisfied that there shall
not have occurred any change prior to the Closing Dates in the condition
(financial or otherwise), properties, business, management, prospects, net worth
or results of operations of the Company, or any change in the capital stock,
short-term or long-term debt of the Company, such that (i) the Registration
Statement or the Prospectus, or any amendment or supplement thereto, contains an
untrue statement of fact which, in the opinion of the Representatives, is
material, or omits to state a fact which, in the opinion of the Representatives,
is required to be stated therein or is necessary to make the statements therein
not misleading, or (ii) it is unpracticable in the reasonable judgment of the
Representatives to proceed with the public offering or purchase the Stock as
contemplated hereby.

              (c) The Representatives shall be satisfied that no legal or
governmental action, suit or proceeding affecting the Company which is material
and adverse to the Company or which affects or may affect the Company's ability
to perform its obligations under this Agreement shall have been instituted or
threatened and there shall have occurred no material adverse development in any
existing such action, suit or proceeding.

              (d) At the time of execution of this Agreement, the
Representatives shall have received from Ernst & Young LLP, independent
certified public accountants, a letter, dated the date hereof, in form and
substance satisfactory to the Underwriters.

              (e) The Representatives shall have received from Ernst & Young
LLP, independent certified public accountants, letters, dated the Closing Dates,
to the effect that such accountants reaffirm, as of the Closing Dates, and as
though made on the Closing Dates, the statements made in the letter furnished by
such accountants pursuant to paragraph (d) of this Section 8. In addition, the
Representatives shall have received from Ernst & Young LLP a letter addressed to
the Company and made available to the Representatives for use by the
Underwriters stating that their review of the Company's system of internal
accounting controls, to the extent that they deemed necessary in establishing
the scope of their examination of the Company's financial statements as of
December 31, 1995, did not disclose any weaknesses in internal controls that
they considered to be material weaknesses.

              (f) The Representatives shall have received from Pillsbury Madison
& Sutro LLP, counsel for the Company, an opinion, dated as of each of the
Closing Dates, to the effect set forth in Exhibit I hereto.



                                      21.
<PAGE>   22
              (g)  The Representatives shall have received from Kaye, Scholer,
Fierman & Hays, patent counsel for the Company, an opinion, dated as of each of
the Closing Dates, to the effect set forth in Exhibit II hereto.

              (h)  The Representatives shall have received from Townsend &
Townsend, patent counsel for the Company, an opinion, dated as of each of the
Closing Dates, to the effect set forth in Exhibit III hereto.

              (i)  The Representatives shall have received from Lyon & Lyon,
patent counsel for the Company, an opinion, dated as of each of the Closing
Dates, to the effect set forth in Exhibit IV hereto.

              (j)  The Representatives shall have received from Campbell &
Flores, patent counsel for the Company, an opinion, dated as of each of the
Closing Dates, to the effect set forth in Exhibit V hereto.

              (k)  The Representatives shall have received from Hogan & Hartson
LLP, regulatory counsel for the Company, an opinion, dated as of each of the
Closing Dates, to the effect set forth in Exhibit VI hereto.

              (l)  The Representatives shall have received from Cooley Godward
LLP, counsel for the Underwriters, their opinion or opinions dated as of each of
the Closing Dates with respect to the incorporation of the Company, the validity
of the Stock, the Registration Statement and the Prospectus and such other
related matters as it may reasonably request, and the Company shall have
furnished to such counsel such documents as they may request for the purpose of
enabling them to pass upon such matters.

              (m)  The Representatives shall have received a certificate, dated
as of each of Closing Dates, of the chief executive officer or the President and
the chief financial or accounting officer of the Company to the effect that:

                   (i)   No stop order suspending the effectiveness of the
Registration Statement has been issued, and, to the best of the knowledge of the
signers, no proceedings for that purpose have been instituted or are pending or
contemplated under the Securities Act;

                   (ii)  Neither any Preeffective Prospectus, as of its date,
nor the Registration Statement nor the Prospectus, nor any amendment or
supplement thereto, as of the time when the Registration Statement became
effective and at all times subsequent thereto up to the delivery of such
certificate, included any untrue statement of a material fact or omitted to
state any material fact required to be stated therein or necessary to make the
statements therein, in light of the circumstances under which they were made,
not misleading;


                                      22.
<PAGE>   23
                   (iii) Subsequent to the respective dates as of which
information is given in the Registration Statement and the Prospectus, and
except as set forth or contemplated in the Prospectus, the Company has not
incurred any material liabilities or obligations, direct or contingent, nor
entered into any material transactions not in the ordinary course of business
and there has not been any material adverse change in the condition (financial
or otherwise), properties, business, management, prospects, net worth or results
of operations of the Company, or any change in the capital stock, short-term or
long-term debt of the Company;

                   (iv)  The representations and warranties of the Company in
this Agreement are true and correct at and as of the Closing Dates, and the
Company has complied with all the agreements and performed or satisfied all the
conditions on its part to be performed or satisfied at or prior to the Closing
Dates; and

                   (v)   Since the respective dates as of which information is
given in the Registration Statement and the Prospectus, and except as disclosed
in or contemplated by the Prospectus, (i) there has not been any material
adverse change or a development involving a material adverse change in the
condition (financial or otherwise), properties, business, management, prospects,
net worth or results of operations of the Company; (ii) the business and
operations conducted by the Company have not sustained a loss by strike, fire,
flood, accident or other calamity (whether or not insured) of such a character
as to interfere materially with the conduct of the business and operations of
the Company; (iii) no legal or governmental action, suit or proceeding is
pending or threatened against the Company which is material to the Company,
whether or not arising from transactions in the ordinary course of business, or
which may materially and adversely affect the transactions contemplated by this
Agreement; (iv) since such dates and except as so disclosed, the Company has not
incurred any material liability or obligation, direct, contingent or indirect,
nor entered into any material transaction not in the ordinary course of
business, made any change in its capital stock (except pursuant to its stock
plans), made any material change in its short-term or funded debt or repurchased
or otherwise acquired any of the Company's capital stock; and (v) the Company
has not declared or paid any dividend, or made any other distribution, upon its
outstanding capital stock payable to stockholders of record on a date prior to
the Closing Date.

              (n)  The Company shall have furnished to the Representatives such
additional certificates as the Representatives may have reasonably requested as
to the accuracy, at and as of the Closing Dates, of the representations and
warranties made herein by it and as to compliance at and as of the Closing Dates
by it with its covenants and agreements herein contained and other provisions
hereof to be satisfied at or prior to the Closing Dates, and as to satisfaction
of the other conditions to the obligations of the Underwriters hereunder.



                                      23.
<PAGE>   24
              (o) Cowen shall have received the written agreements of each
officer, director and holder of Common Stock of the Company listed in Schedule
___ that each will not offer, sell, assign, transfer, encumber, contract to
sell, grant an option to purchase or otherwise dispose of, other than by
operation of law, gifts, pledges or dispositions by estate representatives, any
shares of Common Stock (including, without limitation, Common Stock of the
Company which may be deemed to be beneficially owned by such person or entity in
accordance with the Rules and Regulations) during the one hundred eighty (180)
days following the date of the final Prospectus.

         All opinions, certificates, letters and other documents will be in
compliance with the provisions hereunder only if they are satisfactory in form
and substance to the Representatives. The Company will furnish to the
Representatives conformed copies of such opinions, certificates, letters and
other documents as the Representatives shall reasonably request. If any of the
conditions hereinabove provided for in this Section shall not have been
satisfied when and as required by this Agreement, this Agreement may be
terminated by the Representatives by notifying the Company of such termination
in writing or by telegram at or prior to the Closing Dates, but Cowen shall be
entitled to waive any of such conditions.

         9.   EFFECTIVE DATE. This Agreement shall become effective immediately
as to Sections 5, 6, 7, 9, 10, 11, 13, 14, 15, 16 and 17 and, as to all other
provisions, at 11:00 a.m. New York City time on the first full business day
following the effectiveness of the Registration Statement or at such earlier
time after the Registration Statement becomes effective as the Representatives
may determine on and by notice to the Company or by release of any of the Stock
for sale to the public. For the purposes of this Section 9, the Stock shall be
deemed to have been so released upon the release for publication of any
newspaper advertisement relating to the Stock or upon the release by you of
telegrams (i) advising Underwriters that the shares of Stock are released for
public offering or (ii) offering the Stock for sale to securities dealers,
whichever may occur first.

         10.  TERMINATION. This Agreement (except for the provisions of Section
5) may be terminated by the Company at any time before it becomes effective in
accordance with Section 9 by notice to the Representatives and may be terminated
by the Representatives at any time before it becomes effective in accordance
with Section 9 by notice to the Company. In the event of any termination of this
Agreement under this or any other provision of this Agreement, there shall be no
liability of any party to this Agreement to any other party, other than as
provided in Sections 5, 6 and 11 and other than as provided in Section 12 as to
the liability of defaulting Underwriters.

         This Agreement may be terminated after it becomes effective by the
Representatives by notice to the Company (i) if at or prior to the First Closing
Date or the Option Closing Date trading in securities on any of the New York
Stock Exchange, American Stock Exchange, Nasdaq National Market, Chicago Board
of Options 



                                      24.
<PAGE>   25
Exchange, Chicago Mercantile Exchange or Chicago Board of Trade shall have been
suspended or minimum or maximum prices shall have been established on any such
exchange or market, or a banking moratorium shall have been declared by New York
or United States authorities; (ii) trading of any securities of the Company
shall have been suspended on any exchange or in any over-the-counter market;
(iii) if at or prior to the First Closing Date or the Option Closing Date there
shall have been (A) an outbreak or escalation of hostilities between the United
States and any foreign power or of any other insurrection or armed conflict
involving the United States or (B) any change in financial markets or any
calamity or crisis which, in the judgment of the Representatives, makes it
impractical or inadvisable to offer or sell the Firm Stock or Optional Stock, as
applicable on the terms contemplated by the Prospectus; (iv) if there shall have
been any development or prospective development involving particularly the
business or properties or securities of the Company or the transactions
contemplated by this Agreement, which, in the judgment of the Representatives,
makes it impracticable or inadvisable to offer or deliver the Firm Stock or the
Optional Stock, as applicable on the terms contemplated by the Prospectus; (v)
if there shall be any litigation or proceeding, pending or threatened, which, in
the judgment of the Representatives, makes it impracticable or inadvisable to
offer or deliver the Firm Stock or Optional Stock, as applicable, on the terms
contemplated by the Prospectus; or (vi) if there shall have occurred any of the
events specified in the immediately preceding clauses (i) - (v) together with
any other such event that makes it, in the judgment of the Representatives,
impractical or inadvisable to offer or deliver the Firm Stock or Optional Stock,
as applicable, on the terms contemplated by the Prospectus.

         11.  REIMBURSEMENT OF UNDERWRITERS. Notwithstanding any other 
provisions hereof, if this Agreement shall not become effective by reason of any
election of the Company pursuant to the first paragraph of Section 10 or shall
be terminated by the Representatives under Section 8 or Section 10, the Company
will bear and pay the expenses specified in Section 5 hereof and, in addition to
its obligations pursuant to Section 6 hereof, the Company will reimburse the
reasonable out-of-pocket expenses of the several Underwriters (including
reasonable fees and disbursements of counsel for the Underwriters) incurred in
connection with this Agreement and the proposed purchase of the Stock, and
promptly upon demand the Company will pay such amounts to you as
Representatives.

         12.  SUBSTITUTION OF UNDERWRITERS. If any Underwriter or Underwriters
shall default in its or their obligations to purchase shares of Stock hereunder
and the aggregate number of shares which such defaulting Underwriter or
Underwriters agreed but failed to purchase does not exceed ten percent (10%) of
the total number of shares underwritten, the other Underwriters shall be
obligated severally, in proportion to their respective commitments hereunder, to
purchase the shares which such defaulting Underwriter or Underwriters agreed but
failed to purchase. If any Underwriter or Underwriters shall so default and the
aggregate number of shares with respect to which such default or defaults 


                                      25.
<PAGE>   26
occur is more than ten percent (10%) of the total number of shares underwritten
and arrangements satisfactory to the Representatives and the Company for the
purchase of such shares by other persons are not made within forty-eight (48)
hours after such default, this Agreement shall terminate.

         If the remaining Underwriters or substituted Underwriters are required
hereby or agree to take up all or part of the shares of Stock of a defaulting
Underwriter or Underwriters as provided in this Section 12, (i) the Company
shall have the right to postpone the Closing Dates for a period of not more than
five (5) full business days in order that the Company may effect whatever
changes may thereby be made necessary in the Registration Statement or the
Prospectus, or in any other documents or arrangements, and the Company agrees
promptly to file any amendments to the Registration Statement or supplements to
the Prospectus which may thereby be made necessary, and (ii) the respective
numbers of shares to be purchased by the remaining Underwriters or substituted
Underwriters shall be taken as the basis of their underwriting obligation for
all purposes of this Agreement. Nothing herein contained shall relieve any
defaulting Underwriter of its liability to the Company or the other Underwriters
for damages occasioned by its default hereunder. Any termination of this
Agreement pursuant to this Section 12 shall be without liability on the part of
any non-defaulting Underwriter or the Company, except for expenses to be paid or
reimbursed pursuant to Section 5 and except for the provisions of Section 6.

         13.  NOTICES. All communications hereunder shall be in writing and, if
sent to the Underwriters shall be mailed, delivered or telegraphed and confirmed
to you, as their Representatives c/o Cowen at Financial Square, New York, New
York 10005 except that notices given to an Underwriter pursuant to Section 6
hereof shall be sent to such Underwriter at the address furnished by the
Representatives or, if sent to the Company, shall be mailed, delivered or
telegraphed and confirmed c/o Kim D. Blickenstaff, President and Chief Executive
Officer, Biosite Diagnostics Incorporated, 11030 Roselle Street, San Diego,
California 92121.

         14.  SUCCESSORS. This Agreement shall inure to the benefit of and be
binding upon the several Underwriters, the Company and their respective
successors and legal representatives. Nothing expressed or mentioned in this
Agreement is intended or shall be construed to give any person other than the
persons mentioned in the preceding sentence any legal or equitable right, remedy
or claim under or in respect of this Agreement, or any provisions herein
contained, this Agreement and all conditions and provisions hereof being
intended to be and being for the sole and exclusive benefit of such persons and
for the benefit of no other person; except that the representations, warranties,
covenants, agreements and indemnities of the Company contained in this Agreement
shall also be for the benefit of the person or persons, if any, who control any
Underwriter or Underwriters within the meaning of Section 15 of the Securities
Act or Section 20 of the Exchange Act, and the indemnities of the several
Underwriters shall



                                      26.
<PAGE>   27
also be for the benefit of each director of the Company, each of its officers
who has signed the Registration Statement and the person or persons, if any, who
control the Company within the meaning of Section 15 of the Securities Act or
Section 20 of the Exchange Act.

         15.  APPLICABLE LAW. This Agreement shall be governed by and construed
in accordance with the laws of the State of New York.

         16.  AUTHORITY OF THE REPRESENTATIVES. In connection with this
Agreement, you will act for and on behalf of the several Underwriters, and any
action taken under this Agreement by Cowen, as Representative, will be binding
on all the Underwriters.

         17.  PARTIAL UNENFORCEABILITY. The invalidity or unenforceability of 
any Section , paragraph or provision of this Agreement shall not affect the
validity or enforceability of any other Section , paragraph or provision hereof.
If any Section , paragraph or provision of this Agreement is for any reason
determined to be invalid or unenforceable, there shall be deemed to be made such
minor changes (and only such minor changes) as are necessary to make it valid
and enforceable.

         18.  GENERAL. This Agreement constitutes the entire agreement of the
parties to this Agreement and supersedes all prior written or oral and all
contemporaneous oral agreements, understandings and negotiations with respect to
the subject matter hereof.

         In this Agreement, the masculine, feminine and neuter genders and the
singular and the plural include one another. The section headings in this
Agreement are for the convenience of the parties only and will not affect the
construction or interpretation of this Agreement. This Agreement may be amended
or modified, and the observance of any term of this Agreement may be waived,
only by a writing signed by the Company and the Representatives.

         19.  COUNTERPARTS. This Agreement may be signed in two (2) or more
counterparts, each of which shall be an original, with the same effect as if the
signatures thereto and hereto were upon the same instrument.



                                      27.
<PAGE>   28
         If the foregoing correctly sets forth our understanding, please
indicate your acceptance thereof in the space provided below for that purpose,
whereupon this letter and your acceptance shall constitute a binding agreement
between us.

                                       Very truly yours,
                                       BIOSITE DIAGNOSTICS INCORPORATED



                                       By:______________________________________
                                          Kim D. Blickenstaff, President and
                                          Chief Executive Officer


Accepted and delivered in 
  San Diego, California as of
  the date first above written.

COWEN & COMPANY
ALEX BROWN & SONS INCORPORATED
       Acting on their own behalf
       and as Representatives of several
       Underwriters referred to in the 
       foregoing Agreement.

By: Cowen Incorporated,
      its general partner

    By:________________________________
    Title:_____________________________



                                      28.
<PAGE>   29
                                   SCHEDULE A

<TABLE>
<CAPTION>
                                                    Number           Number of
                                                   of Firm           Optional
                                                    Shares            Shares
                                                    to be              to be
                 Name                             Purchased          Purchased
- -----------------------------------------         ---------          ---------

<S>                                               <C>                <C>
Cowen & Company..........................
Alex. Brown & Sons Incorporated..........







Total....................................
                                                  =========          ========= 
</TABLE>


                                       1.
<PAGE>   30
                                    EXHIBIT I

                     MATTERS TO BE COVERED IN THE OPINION OF
                         PILLSBURY MADISON & SUTRO LLP,
                             COUNSEL FOR THE COMPANY


         1.   The Company is a corporation duly organized, validly existing and
in good standing under the laws of the State of Delaware, to the knowledge of
such counsel, is duly qualified to do business and is in good standing as a
foreign corporation in each jurisdiction in the United States in which the
nature of the activities conducted by it or the character of the assets owned or
leased by it makes such qualification necessary, except to the extent that the
failure to so qualify would not have a material adverse effect on the Company or
its business and has full corporate power and authority to conduct all the
activities conducted by it, to own or lease all the assets owned or leased by it
and to conduct its business as described in the Registration Statement and the
Prospectus. To the best of such counsel's knowledge, the Company does not own or
control, directly or indirectly, any corporation, association or other entity.

         2.   The issued and outstanding shares of capital stock of the Company
have been, and the Shares will be, when issued and sold to and paid for by the
Underwriters in accordance with the terms of the Underwriting Agreement, duly
authorized validly issued, fully paid and nonassessable and were not and will
not be issued in violation of any preemptive or to the knowledge of such counsel
similar right. All outstanding shares of capital stock of the Company were
issued in compliance with the registration and qualification provisions of all
applicable securities laws. The certificate evidencing the common stock of the
Company filed as an exhibit to the Registration Statement is in due and proper
form under Delaware law.

         3.   No consent, approval, authorization or order of, or any or filing
or declaration with, any court or governmental agency or body is required in
connection with the execution, delivery and performance of the Underwriting
Agreement by the Company, the authorization, issuance, transfer, sale or
delivery of the Shares or the taking by the Company of any action provided for
in the Underwriting Agreement, except such as have been obtained under the
Securities Act and the Rules and Regulations and such as may be required under
applicable state securities or Blue Sky laws and by the By-laws and rules of the
NASD in connection with the purchase and distribution by the Underwriters of the
Shares.

         4.   The authorized and outstanding capital stock of the Company as of
_________________, 1996 was set forth in the Registration Statement and the
Prospectus. The capital stock of the Company conforms as to legal matters in all
material respects to the description thereof contained in the Prospectus under
the caption "Description of Capital Stock." Except as disclosed in or
specifically provided for in the Prospectus, there are, to the 



                                       1.
<PAGE>   31
knowledge of such counsel, no outstanding options, warrants or other rights
requiring the issuance of, and no commitments to issue, any shares of capital
stock of the Company or security convertible into or exercisable for capital
stock of the Company.

         5.   The Registration Statement and the Prospectus comply as to form in
all material respects with the requirements of the Securities Act and the Rules
and Regulations (except that such counsel need express no opinion as to
financial statements and related notes, schedules and other financial and
statistical data contained in the Registration Statement and the Prospectus).

         6.   The Registration Statement is effective under the Securities Act
and, to the best knowledge of such counsel, no order suspending the
effectiveness of the Registration Statement has been issued and no proceeding
for that purpose has been instituted or is threatened or pending.

         7.   Such counsel reviewed all contracts or other documents filed as
exhibits to the Registration Statement and such contracts or other documents are
fairly summarized or disclosed in the Registration Statement to the extent
required under the Securities Act and the Rules and Regulations, and such
counsel does not know of any contract or other document required to be so
summarized or disclosed or filed which has not been so summarized or disclosed
or filed.

         8.   The Company has full corporate power and authority to enter into
the Underwriting Agreement, and such agreement has been duly authorized,
executed and delivered by the Company, and is a valid and binding agreement of
the Company, enforceable in accordance with its terms, except for the
indemnification and contribution provisions of the Underwriting Agreement, as to
which such counsel need express no opinion, and except as enforcement may be
limited by bankruptcy, insolvency, fraudulent transfer, reorganization,
moratorium or other laws relating to or affecting creditors' rights generally or
by general principles of equity and limitations on availability of equitable
remedies.

         9.   The execution and delivery of the Underwriting Agreement by the
Company, the consummation by the Company of the transactions contemplated
therein (other than the indemnification and contribution obligations of the
Company thereunder) do not conflict with, or result in a breach or violation of
any terms or provisions of, or constitute a material default under, or result in
the creation or imposition of any lien, charge or encumbrance upon, any property
or assets of the Company pursuant to (A) the terms of the Amended and Restated
Certificate of Incorporation or Bylaws of the Company, (B) any agreement or
instrument of the Company that is filed as an exhibit to the Registration
Statement, (C) any statute, rule or regulation of any regulatory body or
administrative agency or other governmental agency or body having jurisdiction
over the Company or its activities or properties or (D) to the best of such
counsel's knowledge, any judgment, decree or order of any government,
arbitrator, court, regulatory body or administrative agency or other
governmental agency or body having 


                                       2.
<PAGE>   32
jurisdiction over the Company or any of its activities or properties, and no
consent, approval, authorization or order of any court, regulatory body or
administrative agency or other governmental agency or body is required for the
Company's performance of the Underwriting Agreement or the consummation by the
Company of the transactions contemplated thereby, except such as have been
obtained under the Securities Act and except as may be required under the rules
of the NASD and applicable Blue Sky laws, as to which such counsel need express
no opinion.

         10.  Upon delivery of and payment for the Shares as provided in the
Underwriting Agreement and upon registration of such Shares in the names of the
Underwriters (or their nominees) in the stock records of the Company, good and
marketable title will have been transferred to the Underwriters free and clear
of any adverse claim, provided that the Underwriters are purchasing such shares
in good faith and without notice of any adverse claim.

         11.  Such counsel knows of no action, suit or proceeding pending or
threatened against the Company or any of its officers in their capacities as
such, before or by any federal or state court, commission, regulatory body,
administrative agency or other governmental body of a character required to be
disclosed in the Registration Statement or Prospectus by the Securities Act or
the applicable Rules and Regulations, other than those described therein.

         12.  To the knowledge of such counsel, the Company (A) is not presently
in material violation of its Amended and Restated Certificate of Incorporation
or Bylaws, (B) is not in material default (nor has an event occurred which with
notice or lapse of time or both would constitute a default or acceleration) in
the performance of any obligation, agreement or condition contained in any
material indenture, mortgage, deed of trust, voting trust agreement, loan
agreement, bond, debenture, note agreement or other evidence of indebtedness,
lease, contract or other agreement or instrument known to such counsel to which
the Company is a party or by which it or its properties is bound or affected,
(C) has not received any claims from governmental agencies or bodies having
jurisdiction over the Company that it is in material breach of any applicable
statute, rule or regulation or (D) is not in material breach of any order, writ
or decree of any court or governmental agency or body having jurisdiction over
the Company or over any of its properties or operations.

         13.  To such counsel's knowledge, except as set forth in the
Registration Statement and Prospectus, no holders of Common Stock or other
securities of the Company have registration rights with respect to securities of
the Company, and, except as set forth in the Registration Statement and
Prospectus, all holders of securities of the Company having rights known to us
to registration of such shares of Common Stock or other securities because of
the filing of the Registration Statement by the Company have, with respect to
the offering contemplated thereby, waived such rights or such rights have been
complied with or have expired by reason of lapse of time following notification
of the Company's intent to file the Registration Statement.


                                       3.
<PAGE>   33
         14.  The Company is not an "investment company" or a "promoter" or
"principal underwriter" for an "investment company," as such terms are defined
in the Investment Company Act of 1940, as amended.

         15.  The Shares have been duly included for quotation on the Nasdaq
National Market.

         16.  To the knowledge of such counsel, no person or entity has the
right to require registration of shares of Common Stock or other securities of
the Company because of the filing or effectiveness of the Registration Statement
or otherwise, except for persons and entities who have expressly waived such
right or who have been given proper notice and have failed to exercise such
right within the time or times required under the terms and conditions of such
right.

         Counsel rendering the foregoing opinion may rely as to questions of law
not involving the laws of the United States or of the State of California, upon
opinions of local counsel satisfactory in form and scope to counsel for the
Underwriters. Copies of any opinion so relied upon shall be delivered to the
Representatives and to counsel for the Underwriters and the foregoing opinion
shall also state that counsel knows of no reason the Underwriters are not
entitled to rely upon the opinions of such local counsel.

         In addition to the matters set forth above, counsel rendering the
foregoing opinion shall also include a statement to the effect that nothing has
come to the attention of such counsel that leads them to believe that the
Registration Statement (except as to the financial statements and schedules and
other financial data contained therein, as to which such counsel need not
express any statement or belief) at the Effective Date contained any untrue
statement of a material fact or omitted to state a material fact required to be
stated therein or necessary to make the statements therein no misleading, that
the Prospectus (except as to the financial statements and schedules and other
financial data contained therein, as to which such counsel need not express any
statement or belief) as of its date or at the Closing Date (or any later date on
which Optional Stock is purchased), contained or contains any untrue statement
of a material fact or omitted or omits to state a material fact necessary in
order to make the statements therein, in light of the circumstances under which
they were made, not misleading.


                                       4.
<PAGE>   34
                                   EXHIBIT II

                     MATTERS TO BE COVERED IN THE OPINION OF
                         KAYE, SCHOLER, FIERMAN & HAYS,
                         PATENT COUNSEL FOR THE COMPANY


         1.   Such counsel represents the Company in certain matters relating to
intellectual property and the Company's diagnostics assays, including patents
and trade secrets.

         2.   Such counsel is familiar with the technology used by the Company
in its business and the manner of its use and has read the portions of the
Registration Statement and the Prospectus entitled "Risk Factors -- Uncertainty
of Patent and Proprietary Technology Protection; License of Technology of Third
Parties" and "Business -- Proprietary Technology and Patents" (collectively, the
"Intellectual Property Portion").

         3.   Such counsel has no knowledge of any facts that the Company lacks
or will be unable to obtain rights to all Intellectual Property necessary to
conduct its business as now or proposed to be conducted by the Company as
described in the Prospectus. Such counsel is not aware of any facts that (i)
would preclude the Company from having clear title to the Patents and
Applications, or (ii) would lead such counsel to conclude that any of the
Patents are invalid or unenforceable or that any patent issued from an
Application would be invalid or unenforceable.

         4.   Such counsel knows of no notification, pending or threatened 
action, suit, proceeding or claim by others or governmental authorities that the
Company is infringing or otherwise violating any patents, copyrights,
trademarks, trade secrets or intellectual property not owned or licensed by the
Company.

         5.   Such counsel is not aware of any pending or threatened actions,
suits, proceedings or claim by governmental authorities or others challenging
the validity, unenforceability or scope of the Applications or the Patents,
other than the patent application proceedings themselves.

         6.   Such counsel is not aware of any infringement on the part of
others of the Patents, Applications, Trademarks or trade secrets, know-how or
other proprietary rights of the Company.

         7.   Such counsel has no knowledge of any patent rights of others which
are or would be infringed by the Company's products or applications of the
Company's products referred to in the Prospectus.



                                       1.
<PAGE>   35
         8.   Nothing has come to the attention of such counsel which causes 
such counsel to believe that the information contained in the statements under
the captions "Risk Factors -- Uncertainty of Patent and Proprietary Technology
protection; License of Technology to Third Parties," "Business -- Technology"
and "Business -- Proprietary Technology and Patents" in (a) the Registration
Statement, or any amendments thereof, contained or contains an untrue statement
of a material fact, or omitted or omits to state a material fact required to be
stated therein or necessary to make the statements therein not misleading, or
(b) the Prospectus, or any amendments thereof, contained or contains an untrue
statement of a material fact or omitted or omits to state any material fact
required to be stated therein or necessary to make the statements therein, in
light of the circumstances under which they were made, not misleading.


                                       2.
<PAGE>   36
                                   EXHIBIT III

                     MATTERS TO BE COVERED IN THE OPINION OF
                              TOWNSEND & TOWNSEND,
                         PATENT COUNSEL FOR THE COMPANY


         1.   Such counsel represents the Company in certain matters relating to
intellectual property and antibody technology, including patents and trade
secrets.

         2.   Such counsel is familiar with the technology used by the Company
in its business and the manner of its use and has read the portions of the
Registration Statement and the Prospectus entitled "Risk Factors -- Uncertainty
of Patent and Proprietary Technology Protection; License of Technology of Third
Parties" and "Business -- Proprietary Technology and Patents" (collectively, the
"Intellectual Property Portion").

         3.   The Company is either assignee of record at the PTO or the
exclusive licensee of each of the patents listed under the heading "U.S. Patents
of the Company" on Schedule B hereof (the "U.S. Patents") and each of the patent
applications listed under the heading "U.S. Patent Applications of the Company"
on Schedule B hereof (the "U.S. Applications"). To the best of knowledge of such
counsel, the Company owns ____ issued U.S. Patents, ____ allowed U.S.
Applications and ____ pending U.S. Applications. Such counsel knows of no claims
by others to any ownership interest or lien with respect to any of the U.S.
Patents or U.S. Applications. To such counsel's knowledge, none of the U.S.
Patents are subject to an interference, reexamination, reissue examination or
declaration action. To such counsel's knowledge, none of the U.S. Applications
has been appealed, finally rejected or subject to an interference.

         4.   The Company is either the assignee of record at the appropriate
foreign patent office or the exclusive licensee of each of the foreign patents
listed under the heading "Non-U.S. Patents of the Company" on Schedule C hereof
(the "Non-U.S. Patents") (collectively, the U.S. Patents and Non-U.S. Patents
are referred to herein as the "Patents") and each of the foreign patent
applications listed under the heading "Non-U.S. Patent Applications of they
Company" on Schedule C hereof (the "Non-U.S. Applications") (collectively, the
U.S. Applications and the Non-U.S. Applications are referred to herein as the
"Applications"). Such counsel knows of no claims by others to any of such
Non-U.S. Patents or Non-U.S. Applications. To such counsel's knowledge, none of
the Non-U.S. Patents are subject to an opposition, national invalidation
proceeding or national court proceeding. To such counsel's knowledge, none of
the Non-U.S. Applications has been finally rejected or appealed.

         5.   Such counsel has no knowledge of any facts that the Company lacks
or will be unable to obtain rights to all Intellectual Property necessary to
conduct its business as now or proposed to be conducted by the Company as
described in the Prospectus. Such counsel is



                                       1.
<PAGE>   37
not aware of any facts that (i) would preclude the Company from having clear
title to the Patents and Applications, or (ii) would lead such counsel to
conclude that any of the Patents are invalid or unenforceable or that any patent
issued from an Application would be invalid or unenforceable.

         6.   Such counsel is not aware of any material defects of form in the
preparation, filing or prosecution of the Application on behalf of the Company
or Licensors of the Applications. To the best of such counsel's knowledge, the
Company, Company's Patent Counsel and Patent Counsel of the Licensors have
complied with the duty of candor and disclosure before the PTO for each of the
U.S. Patents and U.S. Patent Applications. The Applications are being diligently
pursued by the Company.

         7.   Such counsel knows of no notification, pending or threatened 
action, suit, proceeding or claim by others or governmental authorities that the
Company is infringing or otherwise violating any patents, copyrights,
trademarks, trade secrets or intellectual property not owned or licensed by the
Company.

         8.   Such counsel is not aware of any pending or threatened actions,
suits, proceedings or claim by governmental authorities or others challenging
the validity, unenforceability or scope of the Applications or the Patents,
other than the patent application proceedings themselves.

         9.   Such counsel is not aware of any infringement on the part of 
others of the Patents, Applications, Trademarks or trade secrets, know-how or
other proprietary rights of the Company.

         10.  Such counsel has no knowledge of any patent rights of others which
are or would be infringed by the Company's products or applications of the
Company's products referred to in the Prospectus.

         11.  Nothing has come to the attention of such counsel which causes 
such counsel to believe that the information contained in the statements under
the captions "Risk Factors -- Uncertainty of Patent and Proprietary Technology
protection; License of Technology to Third Parties," "Business -- Technology"
and "Business -- Proprietary Technology and Patents" in (a) the Registration
Statement, or any amendments thereof, contained or contains an untrue statement
of a material fact, or omitted or omits to state a material fact required to be
stated therein or necessary to make the statements therein not misleading, or
(b) the Prospectus, or any amendments thereof, contained or contains an untrue
statement of a material fact or omitted or omits to state any material fact
required to be stated therein or necessary to make the statements therein, in
light of the circumstances under which they were made, not misleading.



                                       2.
<PAGE>   38
                                   EXHIBIT IV

                     MATTERS TO BE COVERED IN THE OPINION OF
                                  LYON & LYON,
                         PATENT COUNSEL FOR THE COMPANY


         1.   Such counsel represents the Company in certain matters relating to
intellectual property, including patents, copyrights, trade secrets and certain
trademark matters.

         2.   Such counsel is familiar with the technology used by the Company
in its business and the manner of its use and has read the portions of the
Registration Statement and the Prospectus entitled "Risk Factors -- Uncertainty
of Patent and Proprietary Technology Protection; License of Technology of Third
Parties" and "Business -- Proprietary Technology and Patents" (collectively, the
"Intellectual Property Portion").

         3.   The Company is either assignee of record at the PTO or the
exclusive licensee of each of the patents listed under the heading "U.S. Patents
of the Company" on Schedule B hereof (the "U.S. Patents") and each of the patent
applications listed under the heading "U.S. Patent Applications of the Company"
on Schedule B hereof (the "U.S. Applications"). To the best of knowledge of such
counsel, the Company owns ____ issued U.S. Patents, ____ allowed U.S.
Applications and ____ pending U.S. Applications. Such counsel knows of no claims
by others to any ownership interest or lien with respect to any of the U.S.
Patents or U.S. Applications. To such counsel's knowledge, none of the U.S.
Patents are subject to an interference, reexamination, reissue examination or
declaration action. To such counsel's knowledge, none of the U.S. Applications
has been appealed, finally rejected or subject to an interference.

         4.   The Company is either the assignee of record at the appropriate
foreign patent office or the exclusive licensee of each of the foreign patents
listed under the heading "Non-U.S. Patents of the Company" on Schedule C hereof
(the "Non-U.S. Patents") (collectively, the U.S. Patents and Non-U.S. Patents
are referred to herein as the "Patents") and each of the foreign patent
applications listed under the heading "Non-U.S. Patent Applications of they
Company" on Schedule C hereof (the "Non-U.S. Applications") (collectively, the
U.S. Applications and the Non-U.S. Applications are referred to herein as the
"Applications"). Such counsel knows of no claims by others to any of such
Non-U.S. Patents or Non-U.S. Applications. To such counsel's knowledge, none of
the Non-U.S. Patents are subject to an opposition, national invalidation
proceeding or national court proceeding. To such counsel's knowledge, none of
the Non-U.S. Applications has been finally rejected or appealed.

         5.   Such counsel has no knowledge of any facts that the Company lacks
or will be unable to obtain rights to all Intellectual Property necessary to
conduct its business as now or proposed to be conducted by the Company as
described in the Prospectus. Such counsel is 



                                       1.
<PAGE>   39
not aware of any facts that (i) would preclude the Company from having clear
title to the Patents and Applications, or (ii) would lead such counsel to
conclude that any of the Patents are invalid or unenforceable or that any patent
issued from an Application would be invalid or unenforceable.

         6.   Such counsel is not aware of any material defects of form in the
preparation, filing or prosecution of the Application on behalf of the Company
or Licensors of the Applications. To the best of such counsel's knowledge, the
Company, Company's Patent Counsel and Patent Counsel of the Licensors have
complied with the duty of candor and disclosure before the PTO for each of the
U.S. Patents and U.S. Patent Applications. The Applications are being diligently
pursued by the Company.

         7.   Such counsel knows of no notification, pending or threatened
action, suit, proceeding or claim by others or governmental authorities that the
Company is infringing or otherwise violating any patents, copyrights,
trademarks, trade secrets or intellectual property not owned or licensed by the
Company.

         8.   Such counsel is not aware of any pending or threatened actions,
suits, proceedings or claim by governmental authorities or others challenging
the validity, unenforceability or scope of the Applications or the Patents,
other than the patent application proceedings themselves.

         9.   Such counsel is not aware of any infringement on the part of 
others of the Patents, Applications, Trademarks or trade secrets, know-how or
other proprietary rights of the Company.

         10.  Such counsel has no knowledge of any patent rights of others which
are or would be infringed by the Company's products or applications of the
Company's products referred to in the Prospectus.

         11.  Nothing has come to the attention of such counsel which causes 
such counsel to believe that the information contained in the statements under
the captions "Risk Factors -- Uncertainty of Patent and Proprietary Technology
protection; License of Technology to Third Parties," "Business -- Technology"
and "Business -- Proprietary Technology and Patents" in (a) the Registration
Statement, or any amendments thereof, contained or contains an untrue statement
of a material fact, or omitted or omits to state a material fact required to be
stated therein or necessary to make the statements therein not misleading, or
(b) the Prospectus, or any amendments thereof, contained or contains an untrue
statement of a material fact or omitted or omits to state any material fact
required to be stated therein or necessary to make the statements therein, in
light of the circumstances under which they were made, not misleading.


                                       2.
<PAGE>   40
                                    EXHIBIT V

                     MATTERS TO BE COVERED IN THE OPINION OF
                               CAMPBELL & FLORES,
                         PATENT COUNSEL FOR THE COMPANY


         1.   Such counsel represents the Company in certain matters relating to
intellectual property and the Company's antibody technology, including patents
and trade secrets.

         2.   Such counsel is familiar with the technology used by the Company
in its business and the manner of its use and has read the portions of the
Registration Statement and the Prospectus entitled "Risk Factors -- Uncertainty
of Patent and Proprietary Technology Protection; License of Technology of Third
Parties" and "Business -- Proprietary Technology and Patents" (collectively, the
"Intellectual Property Portion").

         3.   Such counsel has no knowledge of any facts that the Company lacks
or will be unable to obtain rights to all Intellectual Property necessary to
conduct its business as now or proposed to be conducted by the Company as
described in the Prospectus. Such counsel is not aware of any facts that (i)
would preclude the Company from having clear title to the Patents and
Applications, or (ii) would lead such counsel to conclude that any of the
Patents are invalid or unenforceable or that any patent issued from an
Application would be invalid or unenforceable.

         4.   Such counsel knows of no notification, pending or threatened 
action, suit, proceeding or claim by others or governmental authorities that the
Company is infringing or otherwise violating any patents, copyrights,
trademarks, trade secrets or intellectual property not owned or licensed by the
Company.

         5.   Such counsel is not aware of any pending or threatened actions,
suits, proceedings or claim by governmental authorities or others challenging
the validity, unenforceability or scope of the Applications or the Patents,
other than the patent application proceedings themselves.

         6.   Such counsel is not aware of any infringement on the part of 
others of the Patents, Applications, Trademarks or trade secrets, know-how or
other proprietary rights of the Company.

         7.   Such counsel has no knowledge of any patent rights of others which
are or would be infringed by the Company's products or applications of the
Company's products referred to in the Prospectus.



                                       1.
<PAGE>   41
         8.   Nothing has come to the attention of such counsel which causes 
such counsel to believe that the information contained in the statements under
the captions "Risk Factors -- Uncertainty of Patent and Proprietary Technology
protection; License of Technology to Third Parties," "Business -- Technology"
and "Business -- Proprietary Technology and Patents" in (a) the Registration
Statement, or any amendments thereof, contained or contains an untrue statement
of a material fact, or omitted or omits to state a material fact required to be
stated therein or necessary to make the statements therein not misleading, or
(b) the Prospectus, or any amendments thereof, contained or contains an untrue
statement of a material fact or omitted or omits to state any material fact
required to be stated therein or necessary to make the statements therein, in
light of the circumstances under which they were made, not misleading.


                                       2.
<PAGE>   42
                                   EXHIBIT VI

                     MATTERS TO BE COVERED IN THE OPINION OF
                              HOGAN & HARTSON LLP,
                       REGULATORY COUNSEL FOR THE COMPANY


         The statements in the Prospectus under the captions "Risk Factors --
Government Regulation," "Business -- Products and Products Under Development,"
and "Business -- Government Regulation," insofar as such statements purport to
summarize applicable provisions of the Orphan Drug Act, the Federal Food, Drug
and Cosmetic Act and the FDA regulations promulgated thereunder, are accurate
summaries in all material respects of the provisions purported to be summarized
under such captions in the Prospectus.

         During the course of preparation of the Registration Statement, we
participated in certain discussions with officers of the Company as to the FDA
regulatory matters dealt with under the captions "Risk Factors -- Government
Regulation" and Business -- Government Regulation" in the Prospectus. While we
have not undertaken to determine independently, and we do not assume any
responsibility for, the accuracy, completeness or fairness of the statements
under such captions of the Prospectus, we may state on the basis of these
discussions that no facts have come to our attention which cause us to believe
that the statements in the Prospectus under the captions "Risk Factors --
Government Regulation" and Business -- Government Regulation," insofar as such
statements relate to FDA regulatory matters, at the time the Registration
Statement became effective, contained an untrue statement of a material fact or
omitted to state a material fact required to be stated therein or necessary to
make the statement therein not misleading, or as of the date hereof, contains an
untrue statement of material fact or omits to state a material fact necessary in
order to make the statements therein, in the light of the circumstances under
which they were made, not misleading.


                                       1.

<PAGE>   1

                                                                Exhibit 3.(i)1



                     RESTATED CERTIFICATE OF INCORPORATION

                                       OF

                        BIOSITE DIAGNOSTICS INCORPORATED


         Biosite Diagnostics Incorporated, a corporation organized and existing
under the laws of the State of Delaware, hereby certifies as follows:

         FIRST.  The name of the corporation is Biosite Diagnostics
Incorporated.

         SECOND.  The date of filing of its original Certificate of
Incorporation with the Secretary of State of Delaware was March 30, 1988.

         THIRD.  The Restated Certificate of Incorporation of said corporation
shall be amended and restated to read in full as follows:

                                   ARTICLE 1.

         The name of the corporation is Biosite Diagnostics Incorporated.

                                   ARTICLE 2.

         The address of its registered office in the State of Delaware is
Corporation Trust Center, 1209 Orange Street, in the City of Wilmington, County
of New Castle, Delaware 19801.  The name of its registered agent at such
address is The Corporation Trust Company.

                                   ARTICLE 3.

         The nature of the business or purposes to be conducted or promoted is
medical diagnostic products and otherwise to engage in any lawful act or
activity for which corporations may be organized under the General Corporation
Law of Delaware.

                                   ARTICLE 4.

         (A)  Classes of Stock.  The total number of shares of all classes of
capital stock which the corporation shall have authority to issue is Twenty
Million Three Hundred Twenty-Eight Thousand Eight Hundred Forty-Seven
(20,328,847) of which Twelve Million (12,000,000) shares of the par value of
One Cent ($.01) each shall be Common Stock (the "Common Stock") and Eight
Million Three Hundred Twenty-Eight Thousand Eight Hundred Forty-




<PAGE>   2
Seven (8,328,847) shares of the par value of One Cent ($.01) each shall be
Preferred Stock (the "Preferred Stock").

         The Preferred Stock shall be designated the "Series A Preferred
Stock," the "Series B Preferred Stock," the "Series C Preferred Stock," the
"Series D Preferred Stock" and the Series E Preferred Stock, which series shall
consist of 610,000 shares, 2,156,336 shares, 2,204,167 shares, 1,900,010 shares
and 1,458,334 shares, respectively.

         Subject to Section 6, the Preferred Stock may be issued from time to
time in one or more series.  Except for the Series A Preferred Stock, the
Series B Preferred Stock, the Series C Preferred Stock, the Series D Preferred
Stock and the Series E Preferred Stock, the Board of Directors is authorized to
fix the number of shares of any series of Preferred Stock and to determine the
designation of any such shares.  The Board of Directors is also authorized to
determine or alter the rights (including, but not limited to, the voting
rights), preferences, privileges and restrictions granted to or imposed upon
any wholly unissued series of Preferred Stock, and within the limits and
restrictions stated in any resolution or resolutions of the Board of Directors
originally fixing the number of shares constituting any series, to increase or
decrease (but not below the number of shares of such series then outstanding)
the number of shares of any such series subsequent to the issue of shares of
that series by filing a certificate pursuant to the applicable law of the State
of Delaware.

         (B)  Rights, Preferences and Restrictions of Series A Preferred Stock,
Series B Preferred Stock, Series C Preferred Stock, Series D Preferred Stock
and Series E Preferred Stock.  The Series A Preferred Stock, Series B Preferred
Stock, Series C Preferred Stock, Series D Preferred Stock and Series E
Preferred Stock shall have the respective voting power, preferences and
relative, participating, optional or other special rights, and the
qualifications, limitations or restrictions thereof, as follows:

         1.  Dividend Provisions.

         (a)  The holders of shares of Series A Preferred Stock, Series B
Preferred Stock, Series C Preferred Stock, Series D Preferred Stock and Series
E Preferred Stock shall be entitled to receive dividends, out of any assets
legally available therefore, prior and in preference to any declaration or
payment of any dividend (payable other than in Common Stock of this
corporation) on the Common Stock of this corporation, at the rate of $.08 per
share of Series A Preferred Stock per annum, $.1278 per share of Series B
Preferred Stock per annum, $.216 per share of Series C Preferred Stock per
annum, $.27 per share of Series D Preferred Stock per annum and $.432 per share
of Series E Pre-




                                       -2-
<PAGE>   3
ferred Stock per annum, payable quarterly when, as and if declared by the Board
of Directors.

         (b)  Dividends on Series A Preferred Stock, Series B Preferred Stock,
Series C Preferred Stock, Series D Preferred Stock and Series E Preferred Stock
shall not be cumulative, and no rights under this Section 1 shall accrue to the
holders of Series A Preferred Stock, Series B Preferred Stock, Series C
Preferred Stock, Series D Preferred Stock or Series E Preferred Stock, as the
case may be, by reason of the fact that the corporation may have failed to
declare or pay dividends on Series A Preferred Stock, Series B Preferred Stock,
Series C Preferred Stock, Series D Preferred Stock or Series E Preferred Stock,
as the case may be, in any previous fiscal year of the corporation, whether or
not the earnings of the corporation were sufficient to pay such dividends.

         (c)  Dividends, if declared, must be declared and paid with respect to
all series of Preferred Stock contemporaneously, and if less than full
dividends are declared with respect to the Series A Preferred Stock, Series B
Preferred Stock, Series C Preferred Stock, Series D Preferred Stock or Series E
Preferred Stock, the same percentage of the dividend rate of each such series
of Preferred Stock will be payable to each such series of Preferred Stock.

         2.  Liquidation Preference.

         (a)  In the event of any liquidation, dissolution or winding up of
this corporation, either voluntary or involuntary, the holders of Series A
Preferred Stock, Series B Preferred Stock, Series C Preferred Stock and Series
D Preferred Stock shall be entitled to receive, prior and in preference to any
distribution of any of the assets of this corporation to the holders of Series
E Preferred Stock or Common Stock by reason of their ownership thereof, an
amount per share equal to the sum of (a) $1.00 for each outstanding share of
Series A Preferred Stock (the "Original Series A Issue Price"), (b) $1.42 for
each outstanding share of Series B Preferred Stock (the "Original Series B
Issue Price"), (c) $2.40 for each outstanding share of Series C Preferred Stock
(the "Original Series C Issue Price"), (d) $3.00 for each outstanding share of
Series D Preferred Stock (the "Original Series D Issue Price") and (e) in each
case, an amount equal to all declared but unpaid dividends thereon to and
including the date full payment shall be tendered to the holders of such
Preferred Stock with respect to such liquidation, dissolution or winding up.
If upon the occurrence of such event, the assets and funds thus distributed
among the holders of the Series A Preferred Stock, Series B Preferred Stock,
Series C Preferred Stock and Series D Preferred Stock shall be insufficient to
permit the payment to such holders of the full aforesaid preferential amounts,
then the entire assets and funds of this corporation legally available for
distribution





                                      -3-
<PAGE>   4
shall be distributed ratably among the holders of Series A Preferred Stock,
Series B Preferred Stock, Series C Preferred Stock and Series D Preferred Stock
in proportion to the product of the liquidation preference of each such share
and the number of such shares owned by each such holder.

         (b)  Upon the completion of the distribution required by section (a)
above, if assets remain in this corporation, the holders of Series E Preferred
Stock shall be entitled to receive, prior to and in preference to any
distribution of the assets of this corporation to the holders of Common Stock
by reason of their ownership thereof, an amount equal to the sum of (f) $4.80
for each outstanding share of Series E Preferred Stock (the "Original Series E
Issue Price"), and (g) an amount equal to all declared but unpaid dividends
thereon to and including the date full payment shall be tendered to the holders
of such Preferred Stock with respect to such liquidation, dissolution or
winding up.  If upon the occurrence of such event, the assets and funds thus
distributed among the holders of Series E Preferred Stock shall be insufficient
to permit the payment to such holders of the full aforesaid preferential
amounts, then the entire assets and funds of this corporation legally available
for distribution shall be distributed ratably among the holders of the Series E
Preferred Stock in proportion to the product of the liquidation preference of
each such share and the number of such shares owned by each such holder.

         (c)  Upon the completion of the distribution required by sections (a)
and (b) above, if assets remain in this corporation, the holders of Common
Stock shall receive an amount equal to $.07 per share (adjusted to reflect any
stock splits, stock dividends or other recapitalizations).

         (d)  After the distributions described in sections (a), (b) and (c)
above have been paid, the remaining assets of this corporation available for
distribution to stockholders shall be distributed among the holders of the
Series A Preferred Stock, Series B Preferred Stock, Series C Preferred Stock,
Series D Preferred Stock, Series E Preferred Stock and Common Stock pro rata
based on the number of shares of Common Stock held by each (assuming conversion
of all Preferred Stock).

         (e)  Notwithstanding anything set forth above, if upon any
liquidation, dissolution or winding up of this corporation, the amount
available for distribution to the holders of Common Stock (assuming conversion
of all outstanding shares of Preferred Stock) would equal or exceed an amount
per share equal to the Reference Amount (as defined below) in effect at the
time of such liquidation, dissolution or winding up of this corporation, then
all assets of this corporation shall be distributed among the holders of the
Series A Preferred Stock, Series B Preferred Stock, Series C Preferred Stock,
Series D Preferred Stock, Series E Preferred Stock and Common Stock pro rata
based upon





                                      -4-
<PAGE>   5
the number of shares of Common Stock held by each such holder (assuming
conversion of all Series A Preferred Stock, Series B Preferred Stock, Series C
Preferred Stock, Series D Preferred Stock and Series E Preferred Stock).  The
Reference Amount shall be an amount equal to:  $4.15 on or before June 7, 1993;
$4.98 subsequent to June 7, 1993 and on or before June 7, 1994; $5.97
subsequent to June 7, 1994 and on or before June 7, 1995; $7.17 subsequent to
June 7, 1995 and on or before June 7, 1996; and $7.50 subsequent to June 7,
1996.

         (f)  A consolidation or merger of this corporation or sale of all or
substantially all of its assets shall be deemed to be a liquidation for all
purposes of this Section 2, unless stockholders of this corporation are holders
of at least 50% of the voting equity securities of the surviving corporation.

         3.  Redemption.

         (a)  On or at any time after June 7, 1997, upon the receipt by this
corporation from the holders of 66-2/3% of the votes represented by the then
outstanding shares of Preferred Stock, voting as one class in accordance with
Section 5, of their written consent to redemption hereunder of their respective
shares, this corporation may at any time it may lawfully do so, at the option
of the Board of Directors, redeem in whole or in part the Preferred Stock
hereunder by paying in cash therefor a sum per share equal to $1.10 per share
of the Series A Preferred Stock, $1.56 per share of the Series B Preferred
Stock, $2.64 per share of the Series C Preferred Stock, $3.30 per share of the
Series D Preferred Stock and $5.28 per share of the Series E Preferred Stock,
respectively, together with any declared but unpaid dividend on such shares to
the Redemption Date (such total amounts are hereinafter referred to as the
"Redemption Price").

         (b) (i)  In the event of any redemption of only a part of the then
outstanding Preferred Stock, this corporation shall effect such redemption pro
rata among the outstanding shares of Preferred Stock based upon the number of
shares of each such series outstanding.  Such redemption shall be effected pro
rata within each series according to the number of shares held by each holder
thereof.

         (ii)  At least 30, but no more than 60 days prior to the date fixed
for any redemption of Preferred Stock (a "Redemption Date"), written notice
shall be mailed, first class postage prepaid, to each holder of record (at the
close of business on the business day next preceding the day on which notice is
given) of Preferred Stock to be redeemed, at the address last shown on the
records of this corporation for such holder or given by the holder to this
corporation for the purpose of notice or if no such address appears or is given
at the place where the principal executive office of this corporation is





                                      -5-
<PAGE>   6
located, notifying such holder of the redemption to be effected, specifying the
number of shares to be redeemed from such holder, the Redemption Date, the
Redemption Price, the place at which payment may be obtained and the date on
which such holder's Conversion Rights (as hereinafter defined) as to such
shares terminate, and calling upon such holder to surrender to this
corporation, in the manner and at the place designated, such holder's
certificate or certificates representing the shares to be redeemed (the
"Redemption Notice").  Except as provided in subsection 3(b)(iii), on or after
the Redemption Date, each holder of Preferred Stock to be redeemed shall
surrender to this corporation the certificate or certificates representing such
shares, in the manner and at the place designated in the Redemption Notice, and
thereupon the Redemption Price of such shares shall be payable to the order of
the person whose name appears on such certificate or certificates as the owner
thereof and each surrendered certificate shall be cancelled.  In the event less
than all the shares represented by any such certificate are redeemed, a new
certificate shall be issued representing the unredeemed shares.

         (iii)  From and after the Redemption Date, unless there shall have
been a default in payment of the Redemption Price, all rights of the holders of
shares being redeemed as holders of Series A Preferred Stock, Series B
Preferred Stock, Series C Preferred Stock, Series D Preferred Stock or Series E
Preferred Stock, as the case may be (except the right to receive the Redemption
Price without interest upon surrender of their certificate or certificates),
shall cease with respect to such shares, and such shares shall not thereafter
be transferred on the books of this corporation or be deemed to be outstanding
for any purpose whatsoever.

         If the funds of this corporation legally available for redemption of
shares of Preferred Stock on any Redemption Date are insufficient to redeem the
total number of shares of Preferred Stock to be redeemed on such date, those
funds which are legally available will be used to redeem the maximum possible
number of shares pro rata between each series according to the number of
outstanding shares of each series and pro rata among the holders of a series
according to the number of shares held by each holder thereof.  The shares of
Preferred Stock not redeemed shall remain outstanding and entitled to all the
rights and preferences provided herein.  At any time thereafter when additional
funds of this corporation are legally available for the redemption of shares of
Preferred Stock, such funds will immediately be used to redeem the balance of
the shares which this corporation has become obligated to redeem on any
Redemption Date but which it has not redeemed.

         (iv)  Three days prior to the Redemption Date, this corporation shall
deposit the Redemption Price of all outstanding shares of Preferred Stock
designated for redemption in the





                                      -6-
<PAGE>   7
Redemption Notice, and not yet redeemed or converted, with a bank or trust
company having aggregate capital and surplus in excess of $50,000,000 as a
trust fund for the benefit of the respective holders of the shares designated
for redemption and not yet redeemed.  Simultaneously, this corporation shall
deposit irrevocable instructions and authority to such bank or trust company to
pay, on and after the date fixed for redemption or prior thereto, the
Redemption Price of the Series A Preferred Stock, the Series B Preferred Stock,
the Series C Preferred Stock, Series D Preferred Stock or Series E Preferred
Stock, as the case may be, to the holders thereof upon surrender of their
certificates.  Any moneys deposited by this corporation pursuant to this
subsection 3(b)(iv) for the redemption of shares which are thereafter converted
into shares of Common Stock pursuant to Section 4 hereof no later than the
close of business on the Redemption Date shall be returned to this corporation
forthwith upon such conversion.  The balance of any moneys deposited by this
corporation pursuant to this subsection 3(b)(iv) remaining unclaimed at the
expiration of two years following the Redemption Date shall thereafter be
returned to this corporation, provided that the stockholder to which such
moneys would be payable hereunder shall be entitled, upon proof of its
ownership of Series A Preferred Stock, Series B Preferred Stock, Series C
Preferred Stock, Series D Preferred Stock or Series E Preferred Stock, as the
case may be, and payment of any bond requested by this corporation, to receive
such moneys but without interest from the Redemption Date.

         4.  Conversion.  The holders of Preferred Stock shall have conversion
             rights as follows (the "Conversion Rights"):

         (a)  Incidents Causing Conversion.

         (i)  Voluntary Conversion.  Some or all of the outstanding shares of
Series A Preferred Stock, Series B Preferred Stock, Series C Preferred Stock,
Series D Preferred Stock and Series E Preferred Stock, as designated by the
holder thereof, shall be converted into shares of Common Stock pursuant to
subsection 4(c) upon the election of the holder of such shares of Series A
Preferred Stock, Series B Preferred Stock, Series C Preferred Stock, Series D
Preferred Stock or Series E Preferred Stock effected pursuant to subsection
4(b)(i).

         (ii)  Automatic Conversion.  All outstanding shares of Series A
Preferred Stock, Series B Preferred Stock, Series C Preferred Stock, Series D
Preferred Stock and Series E Preferred Stock shall be automatically converted
into shares of Common Stock pursuant to subsections 4(b)(ii) and 4(c)
immediately upon the occurrence of the closing of the issuance of shares of
Common Stock of this corporation in an underwritten public offering, pursuant
to an effective registration statement under the Securities Act of 1933, as
amended, in which the gross proceeds received by this corporation exceed
$7,500,000 and the





                                      -7-
<PAGE>   8
public offering price per share of Common Stock is not less than $9.00 per
share (adjusted to reflect subsequent stock dividends, stock splits or
recapitalization).

         (b)  Mechanics of Conversion.

         (i)  Voluntary Conversion.  As a condition to any conversion of
Preferred Stock into shares of Common Stock pursuant to the voluntary
conversion privilege set forth in subsection 4(a)(i), the holder of Preferred
Stock to be converted shall surrender the certificate or certificates therefor,
duly endorsed, at the office of the corporation or any authorized transfer
agent for such stock, along with a written notice of his election to convert
the same, which notice shall specifically designate the number of shares of
Preferred Stock which the holder elects to convert.  The corporation or the
transfer agent shall, promptly thereafter, issue and deliver at such office to
such holder of Preferred Stock a certificate or certificates for the number of
shares of Common Stock to which such holder is thereby entitled and a
certificate or certificates for the number of shares of Preferred Stock
represented by the surrendered certificate but not converted.  The effective
date of such conversion shall be the date upon which a proper notice and the
duly endorsed certificate or certificates are received by the corporation or
the transfer agent.

         (ii)  Automatic Conversion.  In the event of an automatic conversion
of all outstanding shares of Preferred Stock pursuant to subsection 4(a)(ii),
the effective date of such conversion shall be the date of the occurrence of
the event that triggered such automatic conversion.  Notwithstanding the fact
that such conversion shall be deemed to have taken place automatically, each
holder of outstanding shares of Preferred Stock so converted shall be obligated
to surrender to the corporation all certificates representing his shares of
Preferred Stock so converted, the satisfaction of which obligation shall be a
condition to the corporation's obligation to issue a certificate representing
the shares of Common Stock he received upon such automatic conversion.

         (c)  Conversion Ratio.  Each share of Series A Preferred Stock, Series
B Preferred Stock, Series C Preferred Stock, Series D Preferred Stock and
Series E Preferred Stock to be converted into shares of Common Stock shall be
converted into the number of fully paid and nonassessable shares of Common
Stock determined by dividing the Original Series A Issue Price, the Original
Series B Issue Price, the Original Series C Issue Price, the Original Series D
Issue Price and the Original Series E Issue Price, respectively, by the Series
A Conversion Price, Series B Conversion Price, Series C Conversion Price,
Series D Conversion Price or Series E Conversion Price, as the case may be, in
effect for such shares on the effective date of conversion.  The initial Series
A Conversion Price shall be the





                                      -8-
<PAGE>   9
Original Series A Issue Price, the initial Series B Conversion Price shall be
the Original Series B Issue Price, the initial Series C Conversion Price shall
be the Original Series C Issue Price, the initial Series D Conversion Price
shall be the Original Series D Issue Price and the initial Series E Conversion
Price shall be the Original Series E Issue Price, respectively; provided,
however, that the Conversion Price for shares of Series A Preferred Stock,
Series B Preferred Stock, Series C Preferred Stock, Series D Preferred Stock
and Series E Preferred Stock shall be subject to adjustment as set forth in
subsection 4(d).

         (d)  Adjustment of Conversion Price for Diluting Issues, etc.

         (i)  Certain Definitions.  As used in this Section 4, the following
terms have the following respective meanings:

                 (A)  Options:  rights, options or warrants to subscribe for,
         purchase or otherwise acquire either Common Stock or Convertible
         Securities;

                 (B)  Convertible Securities:  any evidences of indebtedness,
         shares of stock (other than Series A Preferred Stock, Series B
         Preferred Stock, Series C Preferred Stock, Series D Preferred Stock,
         Series E Preferred Stock and Common Stock) or other securities
         directly or indirectly convertible into or exchangeable for Common
         Stock;

                 (C)      Issue; Issued:  with respect to any security
         (including Options), the grant, issue, sale or assumption thereof, as
         the case may be; and

                 (D)  Additional Shares of Common Stock:  For purposes of
         adjusting the Series A Conversion Price, Series B Conversion Price,
         Series C Conversion Price, Series D Conversion Price and Series E
         Conversion Price, "Additional Shares of Common Stock" are all shares
         (including reissued shares) of Common Stock Issued (or, pursuant to
         subsection 4(d)(ii), deemed to be Issued) by the corporation after
         July 21, 1989 without consideration or for a consideration (determined
         pursuant to subsection 4(d)(vi)) per share less than the Series A
         Conversion Price, Series B Conversion Price, Series C Conversion
         Price, Series D Conversion Price or Series E Conversion Price, as the
         case may be, in effect on the date of and immediately prior to such
         Issue, whether or not subsequently reacquired or retired by the
         corporation, other than:

                 (aa)  shares of Common Stock Issued upon conversion of Series
         A Preferred Stock, Series B Pre-





                                      -9-
<PAGE>   10
         ferred Stock, Series C Preferred Stock, Series D Preferred Stock or
         Series E Preferred Stock, as the case may be;

                 (bb)  1,011,000 shares of Common Stock Issued to employees,
         directors, consultants or advisors under a stock plan, through the
         corporation's stock purchase or stock option agreements approved by
         the Board of Directors and such other number of shares of Common Stock
         as may be fixed by written consent of the holders of a majority of the
         outstanding shares of Preferred Stock of this corporation and by the
         Board of Directors of this corporation, issuable or issued to
         employees, directors, consultants or advisors of this corporation
         directly or pursuant to a stock option or a restricted stock purchase
         plan approved by the stockholders and directors of this corporation;
         and

                 (cc)  shares of Common Stock currently outstanding or
         hereafter issued under subsection 4(d)(i)(D)(bb) which are sold to
         employees, directors, consultants or advisors of the corporation after
         such shares have been repurchased from other employees, directors,
         consultants or advisors of the corporation upon the termination of
         their employment with the corporation.

         For the purposes of this subsection 4(d)(i)(D) and the first paragraph
         of subsection 4(d)(ii)(A) below, if different shares of Series C
         Preferred Stock, Series D Preferred Stock and/or Series E Preferred
         Stock have more than one Conversion Price as a result of a waiver of
         adjustment of Conversion Price under subsection 4(d)(v), the
         Conversion Price for Series C Preferred Stock, Series D Preferred
         Stock and/or Series E Preferred Stock, as the case may be, shall be
         the lowest Conversion Price in effect with respect to shares of Series
         C Preferred Stock, Series D Preferred Stock and/or Series E Preferred
         Stock, respectively.

         (ii)  Issue of Securities Deemed Issue of Additional Shares of Common
Stock.

                 (A)  Options and Convertible Securities.  In case the
         corporation at any time or from time to time after the effective date
         hereof shall Issue any Options or Convertible Securities, or shall fix
         a record date for the determination of holders of any class of
         securities entitled to receive any such Options or Convertible
         Securities, then the maximum number of shares (as set forth in the
         instrument relating thereto without regard to the provisions contained
         therein for a sub-





                                      -10-
<PAGE>   11
         sequent adjustment of such number) of Common Stock issuable upon the
         exercise of such Options, or, in the case of Convertible Securities
         and Options therefor, the conversion or exchange of such Convertible
         Securities, shall be deemed to be Additional Shares of Common Stock
         issued as of the time of such Issue or, in case such a record date
         shall have been fixed, as of the close of business on such record
         date; provided, however, that Additional Shares of Common Stock shall
         not be deemed to have been Issued for purposes of adjusting the Series
         A Conversion Price, Series B Conversion Price, Series C Conversion
         Price, Series D Conversion Price or Series E Conversion Price unless
         the consideration per share (determined pursuant to subsection
         4(d)(vi)) of such Additional Shares of Common Stock would be less than
         the applicable Series A Conversion Price, Series B Conversion Price,
         Series C Conversion Price, Series D Conversion Price or Series E
         Conversion Price, as the case may be, in effect on the date of and
         immediately prior to such Issue, or such record date, as the case may
         be.  In any such case in which Additional Shares of Common Stock are
         deemed to be Issued:

                 (1)  no further adjustment of the Series A Conversion Price,
         Series B Conversion Price or Series C Conversion Price, Series D
         Conversion Price or Series E Conversion Price, as the case may be,
         shall be made upon the subsequent Issue of Convertible Securities or
         shares of Common Stock upon the exercise of such Options or the
         conversion or exchange of such Convertible Securities;

                 (2)  if such Options or Convertible Securities by their terms
         provide, with the passage of time or otherwise, for any increase or
         decrease in the consideration payable to the corporation, or increase
         or decrease in the number of shares of Common Stock issuable, upon the
         exercise, conversion or exchange thereof (by change of rate or
         otherwise), the Series A Conversion Price, Series B Conversion Price,
         Series C Conversion Price, Series D Conversion Price or Series E
         Conversion Price, as the case may be, computed upon the original Issue
         thereof (or upon the occurrence of a record date with respect
         thereto), and any subsequent adjustments based thereon, shall, upon
         any such increase or decrease becoming effective, be recomputed to
         reflect such increase or decrease insofar as it affects such Options,
         or the rights of conversion or exchange under such Convertible
         Securities, which are outstanding at such time;





                                      -11-
<PAGE>   12
                 (3)  upon the expiration of any such Options or any rights of
         conversion or exchange under such Convertible Securities which shall
         not have been exercised, the Series A Conversion Price, Series B
         Conversion Price, Series C Conversion Price, Series D Conversion Price
         or Series E Conversion Price, as the case may be, computed upon the
         original Issue thereof (or upon the occurrence of a record date with
         respect thereto), and any subsequent adjustments based thereon, shall,
         upon such expiration, be recomputed as if:

                 (aa)  in the case of Convertible Securities or Options for
         Common Stock, the only Additional Shares of Common Stock Issued were
         the shares of Common Stock, if any, actually Issued upon the exercise
         of such Options or the conversion or exchange of such Convertible
         Securities and the consideration received therefor was the
         consideration actually received by the corporation for the Issue of
         all such Options, whether or not exercised, plus the consideration
         actually received by the corporation upon such exercise, or for the
         Issue of all such Convertible Securities which were actually converted
         or exchanged, plus the additional consideration, if any, actually
         received by the corporation upon such conversion or exchange, and

                 (bb)  in the case of Options for Convertible Securities, only
         the Convertible Securities, if any, actually Issued upon the exercise
         thereof were Issued at the time of the Issue of such Options, and the
         consideration received therefor was the consideration actually
         received by the corporation (determined pursuant to subsection
         4(d)(vi)) upon the Issue of the Convertible Securities with respect to
         which such Options were actually exercised;

                 (4)  no readjustment pursuant to clause (2) or (3) above shall
         have the effect of increasing the Series A Conversion Price, Series B
         Conversion Price, Series C Conversion Price, Series D Conversion Price
         or Series E Conversion Price, as the case may be, by an amount in
         excess of the amount of the adjustment thereof originally made in
         respect of the Issue of such Options or Convertible Securities; and

                 (5)  in the case of any Options which expire by their terms
         not more than 30 days after the date of Issue thereof, no adjustment
         of the Series A Conversion Price, Series B Conversion Price, Series C
         Conversion Price, Series D Conversion Price or Series E Conversion
         Price, as the case may be, shall be made until the expiration or
         exercise of all such Options,





                                      -12-
<PAGE>   13
         whereupon such adjustment shall be made in the manner provided in
         clause (3) above.

                 (B)  Stock Splits; Stock Dividends.  In case the corporation
         at any time or from time to time after the effective date hereof shall
         declare or pay any dividend on the Common Stock payable in Common
         Stock, or effect a subdivision of the outstanding shares of Common
         Stock into a greater number of shares of Common Stock, Additional
         Shares of Common Stock shall not be deemed to have been Issued as a
         result thereof; provided, however, that if the corporation shall at
         any time or from time to time after the effective date hereof effect a
         subdivision of the outstanding Common Stock (and not effect a
         corresponding subdivision of Preferred Stock) the applicable Series A
         Conversion Price, Series B Conversion Price, Series C Conversion
         Price, Series D Conversion Price and Series E Conversion Price then in
         effect immediately before that subdivision shall be proportionately
         decreased; and provided, further, that if the corporation at any time
         or from time to time after the effective date hereof shall make or
         issue, or fix a record date for the determination of holders of Common
         Stock entitled to receive, a dividend or other distribution payable in
         additional shares of Common Stock, then and in each such event the
         applicable Series A Conversion Price, Series B Conversion Price,
         Series C Conversion Price, Series D Conversion Price and Series E
         Conversion Price then in effect shall be decreased as of the time of
         such issuance or, in the event such a record date shall have been
         fixed, as of the close of business on such record date, by multiplying
         the applicable Series A Conversion Price, Series B Conversion Price,
         Series C Conversion Price, Series D Conversion Price and Series E
         Conversion Price then in effect by a fraction:

                 (1)  the numerator of which shall be the total number of
         shares of Common Stock outstanding immediately prior to the time of
         such issuance or the close of business on such record date, and

                 (2)  the denominator of which shall be the total number of
         shares of Common Stock outstanding immediately prior to the time of
         such issuance or the close of business on such record date plus the
         number of shares of Common Stock issuable in payment of such dividend
         or distribution.

         Notwithstanding anything herein to the contrary, with respect to each
         such series of Preferred Stock, no Additional Shares of Common Stock
         shall be deemed to





                                      -13-
<PAGE>   14
         be Issued as the result of the distribution as a dividend of Common
         Stock, or Options or Convertible Securities, as to which such series
         of Preferred Stock participates pro rata with all holders receiving
         such dividend on an as-converted basis.

         (iii)  Adjustment of Conversion Price of Series A, Series B and Series
E Preferred Stock for Sales at Less Than the Conversion Price.  In case the
corporation shall Issue Additional Shares of Common Stock (including Additional
Shares of Common Stock deemed to be Issued pursuant to subsection 4(d)(ii))
then and in each such case, the Series A Conversion Price, Series B Conversion
Price or Series E Conversion Price, as the case may be, in effect on the date
of and immediately prior to such Issue shall be reduced, concurrently with such
Issue, to a price (calculated to the nearest cent) determined by multiplying
such Series A Conversion Price, Series B Conversion Price or Series E
Conversion Price by a fraction:

                 (x)  the numerator of which shall be the number of shares of
         Common Stock outstanding immediately prior to such Issue (for purposes
         of this calculation only, including in the number of shares of Common
         Stock outstanding the number of shares of Common Stock presently
         issuable upon the conversion of all outstanding shares of Preferred
         Stock) plus the number of shares of Common Stock which the aggregate
         consideration received by the corporation for the total number of such
         Additional Shares of Common Stock so Issued would purchase at such
         Series A Conversion Price, Series B Conversion Price or Series E
         Conversion Price, as the case may be, and

                 (y)  the denominator of which shall be the number of shares of
         Common Stock (for purposes of this calculation only, including in the
         number of shares of Common Stock outstanding the number of shares of
         Common Stock presently issuable upon the conversion of all outstanding
         shares of Preferred Stock) outstanding immediately prior to such Issue
         plus the number of such Additional Shares of Common Stock so Issued,

provided that the Series A Conversion Price, the Series B Conversion Price or
the Series E Conversion Price shall not be so reduced at such time if the
amount of any such reduction would be an amount less than two cents, but any
such amount shall be carried forward and reduction with respect thereto made at
the time of and together with any subsequent reduction which, together with
such amount and any other amount or amounts so carried forward, shall aggregate
two cents or more.  For the purposes of this subsection 4(d)(iii), immediately
after any Additional Shares of Common Stock are deemed Issued pursuant to





                                      -14-
<PAGE>   15
subsection 4(d)(ii), such Additional Shares of Common Stock shall be deemed to
be outstanding.  Any series of issuances of Additional Shares of Common Stock
consisting of Common Stock or the same series of Preferred Stock, Issued at the
same price and occurring within a six-month period, shall be treated as one
issuance of Additional Shares of Common Stock for the purposes of this
calculation.

         (iv)  Adjustment of Conversion Price of the Series C and Series D
Preferred Stock for Sales at Less Than the Conversion Price.  In case the
corporation shall Issue Additional Shares of Common Stock (including Additional
Shares of Common Stock deemed to be Issued pursuant to subsection 4(d)(ii))
then and in each such case, the applicable Series C Conversion Price or Series
D Conversion Price, as the case may be, in effect on the date of and
immediately prior to such Issue shall be reduced, concurrently with such Issue,
to a price (calculated to the nearest cent) determined by multiplying such
Series C Conversion Price or Series D Conversion Price by a fraction:

                 (x)  the numerator of which shall be the number of shares of
         Common Stock issuable upon the conversion of all shares of Series C
         Preferred Stock or Series D Preferred Stock, as the case may be, plus
         the number of shares of Common Stock issued upon any conversion of
         previously outstanding shares of Series C Preferred Stock or Series D
         Preferred Stock, as the case may be, plus the number of shares of
         Common Stock which the aggregate consideration received by the
         corporation for the total number of such Additional Shares of Common
         Stock so Issued would purchase at such Series C Conversion Price or
         Series D Conversion Price, and

                 (y)  the denominator of which shall be the number of shares of
         Common Stock issuable upon the conversion of all outstanding shares of
         Series C Preferred Stock or Series D Preferred Stock, as the case may
         be, plus the number of shares of Common Stock issued upon any
         conversion of previously outstanding shares of Series C Preferred
         Stock or Series D Preferred Stock, as the case may be, plus the number
         of such Additional Shares of Common Stock so Issued,

provided that the applicable Series C Conversion Price or Series D Conversion
Price shall not be so reduced at such time if the amount of any such reduction
would be an amount less than two cents, but any such amount shall be carried
forward and reduction with respect thereto made at the time of and together
with any subsequent reduction which, together with such amount and any other
amount or amounts so carried forward, shall aggregate two cents or more.  For
the purposes of this subsection 4(d)(iv), immediately after any Additional
Shares of Common Stock are deemed Issued pursuant to subsection 4(d)(ii), such





                                      -15-
<PAGE>   16
Additional Shares of Common Stock shall be deemed to be outstanding.  Any
series of issuances of Additional Shares of Common Stock consisting of Common
Stock or the same series of Preferred Stock, Issued at the same price and
occurring within a six-month period, shall be treated as one issuance of
Additional Shares of Common Stock for the purposes of this calculation.

         (v)  Waiver of Adjustment of Series C, Series D and Series E
Conversion Price.  Notwithstanding anything herein to the contrary, the
operation of, and any adjustment of the Series C Conversion Price, Series D
Conversion Price or Series E Conversion Price, as the case may be, pursuant to
subsections 4(d)(iii) and 4(d)(iv) may be waived with respect to any specific
share or shares of Series C Preferred Stock, Series D Preferred Stock or Series
E Preferred Stock, either prospectively or retroactively and either generally
or in a particular instance by a writing executed by the registered holder of
such share or shares.  Any waiver pursuant to this subsection 4(d)(v) shall
bind all future holders of shares of Series C Preferred Stock, Series D
Preferred Stock and Series E Preferred Stock for which rights have been waived.
In the event that a waiver of adjustment of Conversion Price under this
subsection 4(d)(v) results in different Conversion Prices for shares of Series
C Preferred Stock, Series D Preferred Stock or Series E Preferred Stock, the
Secretary of the corporation shall maintain a written ledger identifying the
Conversion Price for each share of Series C Preferred Stock, Series D Preferred
Stock and Series E Preferred Stock.  Such information shall be made available
to any person upon request.

         (vi)  Computation of Consideration.  For the purposes of this
subsection 4(d), the consideration received by the corporation for the Issue of
any Additional Shares of Common Stock shall be computed as follows:

                 (A)  Nature of Consideration.      Such consideration shall,

                 (1)  insofar as it consists of cash, be computed at the gross
         amount of cash received by the corporation, excluding amounts paid or
         payable for accrued interest or accrued dividends, before deducting
         any expenses paid or incurred by the corporation and any commissions
         and compensation paid and concessions and discounts allowed to
         underwriters, dealers or others performing similar services in
         connection with such Issue;

                 (2)  insofar as it consists of property other than cash, be
         computed at the fair market value thereof at the time of such Issue,
         as determined in good faith by the Board of Directors (provided,
         however, that no value shall be attributed to any





                                      -16-
<PAGE>   17
         services performed by any employee, officer or director of the
         corporation); and

                 (3)  in case Additional Shares of Common Stock are Issued
         together with other stock or securities or other assets of the
         corporation for consideration which covers both, be the proportion of
         such consideration received with respect to the Additional Shares of
         Common Stock, computed as provided in clauses (1) and (2) above, as
         determined in good faith by the Board of Directors.

                 (B)  Options and Convertible Securities.  The consideration
         per share received by the corporation for Additional Shares of Common
         Stock deemed to have been Issued pursuant to subsection 4(d)(ii)(A),
         relating to Options and Convertible Securities, shall be determined by
         dividing:

                 (x)  the total amount, if any, received or receivable by the
         corporation as consideration for the Issue of such Options or
         Convertible Securities, plus the minimum aggregate amount of
         additional consideration (as set forth in the instruments relating
         thereto, without regard to any provision contained therein for a
         subsequent adjustment of such consideration) payable to the
         corporation upon the exercise of such Options or the conversion or
         exchange of such Convertible Securities or, in the case of Options for
         Convertible Securities, the exercise of such Options for Convertible
         Securities and the conversion or exchange of such Convertible
         Securities, by

                 (y)  the maximum number of shares of Common Stock (as set
         forth in the instruments relating thereto, without regard to any
         provision contained therein for a subsequent adjustment of such
         number) issuable upon the exercise of such Options or the conversion
         or exchange of such Convertible Securities.

         (e)  Adjustments for Combinations, etc.  In case the outstanding
shares of Common Stock shall be combined or consolidated, by reclassification
or otherwise, into a lesser number of shares of Common Stock, the applicable
Series A Conversion Price, the Series B Conversion Price, the Series C
Conversion Price, Series D Conversion Price and Series E Conversion Price in
effect immediately prior to such combination or consolidation shall,
concurrently with the effectiveness of such combination or consolidation, be
proportionately increased.





                                      -17-
<PAGE>   18
         (f)  Fractional Shares and Certificate as to Adjustments.

         (i)  No fractional shares shall be issuable upon conversion; and the
number of shares of Common Stock to be issued shall be rounded to the nearest
whole share.  If a fractional share interest arises upon any conversion of
Preferred Stock, the corporation shall eliminate such fractional share interest
upon payment to the former holder of such converted stock of an amount of cash
computed by multiplying such fractional interest by the current market value of
a full share of Common Stock.

         (ii)  Upon the occurrence of each adjustment or readjustment of the
Series A Conversion Price, the Series B Conversion Price, the Series C
Conversion Price, Series D Conversion Price or Series E Conversion Price, as
the case may be, pursuant to this Section 4, the corporation at its expense
shall promptly compute such adjustment or readjustment in accordance with the
terms hereof and cause independent certified public accountants selected by the
corporation to verify such computation and prepare and furnish to each holder
of Series A Preferred Stock, Series B Preferred Stock, Series C Preferred
Stock, Series D Preferred Stock or Series E Preferred Stock, as the case may
be, a certificate setting forth such adjustment or readjustment and the facts
upon which such adjustment or readjustment is based.  The corporation shall,
upon the written request at any time of any holder of Series A Preferred Stock,
Series B Preferred Stock, Series C Preferred Stock, Series D Preferred Stock or
Series E Preferred Stock, as the case may be, furnish or cause to be furnished
to such holder a certificate setting forth the Series A Conversion Price, the
Series B Conversion Price, the Series C Conversion Price, Series D Conversion
Price or the Series E Conversion Price, as the case may be, in effect for such
holder's shares upon the date thereof and the series of adjustments and
readjustments leading to such Series A Conversion Price, Series B Conversion
Price, Series C Conversion Price, Series D Conversion Price or Series E
Conversion Price, as the case may be.

         (g)  Reservation of Stock Issuable Upon Conversion.  The corporation
shall at all times reserve and keep available out of its authorized but
unissued shares of Common Stock, solely for the purpose of effecting the
conversion of the shares of Preferred Stock, such number of its shares of
Common Stock as shall from time to time be sufficient to effect the conversion
of all outstanding shares of Preferred Stock; and if at any time the number of
authorized but unissued shares of Common Stock shall not be sufficient to
effect the conversion of all outstanding shares of Preferred Stock, the
corporation will take such corporate action as is necessary to increase its
authorized but unissued shares of Common Stock to such number of shares as
shall be sufficient for such purpose.





                                      -18-
<PAGE>   19
         (h)  Notices.  Any notice required to be given to holders of shares of
Preferred Stock shall be deemed given upon deposit in the United States mail,
postage prepaid, addressed to such holder of record at his address appearing on
the books of the corporation, or upon personal delivery to the aforementioned
address.

         In the event of any taking by the corporation of a record of the
holders of any class of securities for the purpose of determining the holders
thereof who are entitled to receive any dividend (other than a cash dividend)
or other distribution, any right to subscribe for, purchase or otherwise
acquire any shares of stock of any class or any other securities or property,
or to receive any other right, this corporation shall mail to each holder of
Preferred Stock at least 20 days prior to the date specified therein, a notice
specifying the date on which any such record is to be taken for the purpose of
such dividend, distribution or right, and the amount and character of such
dividend, distribution or right.

         5.  Voting Rights.  The holder of each share of Series A Preferred
Stock, Series B Preferred Stock, Series C Preferred Stock, Series D Preferred
Stock and Series E Preferred Stock shall have the right to one vote for each
share of Common Stock into which such share of Series A Preferred Stock, Series
B Preferred Stock, Series C Preferred Stock, Series D Preferred Stock or Series
E Preferred Stock could then be converted.  In all cases any fractional share,
determined on an aggregate conversion basis, shall be rounded to the nearest
whole share.  With respect to such vote, such holder shall have full voting
rights and powers equal to the voting rights and powers of the holders of
Common Stock, and shall be entitled, notwithstanding any provision hereof, to
notice of any stockholders' meeting in accordance with the bylaws of this
corporation, and shall be entitled to vote, together with holders of Common
Stock, with respect to any question upon which holders of Common Stock have the
right to vote.

         6.  Protective Provisions.  So long as shares of Series A Preferred
Stock, Series B Preferred Stock, Series C Preferred Stock, Series D Preferred
Stock or Series E Preferred Stock are outstanding, this corporation shall not
without first obtaining the approval (by vote or written consent, as provided
by law) of the holders of at least a majority of the then outstanding shares of
Preferred Stock (voting in accordance with Section 5):

         (a)  alter or change the rights, preferences or privileges of the
shares of Preferred Stock so as to affect adversely the shares; or

         (b)  create any new class or series of stock (h) having a preference
over, or being on a parity with the outstanding Preferred Stock with respect to
voting, dividends or upon





                                      -19-
<PAGE>   20
liquidation or redemption, or (i) having rights equal or superior to any of the
rights of the Preferred Stock under this Section 6;

         (c)  declare or pay any dividend on any securities junior to the
Series A Preferred Stock, Series B Preferred Stock, Series C Preferred Stock,
Series D Preferred Stock or Series E Preferred Stock; or

         (d)  sell, convey or otherwise dispose of or encumber all or
substantially all of its property or business or merge into or consolidate with
any other corporation (other than a wholly owned subsidiary corporation) or
effect any transaction or series of related transactions in which more than 50%
of the voting power of this corporation is disposed of.

In accordance with Delaware law, this corporation shall not without first
obtaining the approval (by vote or written consent, as provided by law) of the
holders of at least a majority of the then outstanding shares of Series C
Preferred Stock (voting in accordance with Section 5) alter or change the
powers, preferences or special rights of the Series C Preferred Stock so as to
affect them adversely, without so affecting the entire class of Preferred
Stock.

In accordance with Delaware law, this corporation shall not without first
obtaining the approval (by vote or written consent, as provided by law) of the
holders of at least a majority of the then outstanding shares of Series D
Preferred Stock (voting in accordance with Section 5) alter or change the
powers, preferences or special rights of the Series D Preferred Stock so as to
affect them adversely, without so affecting the entire class of Preferred
Stock.

In accordance with Delaware law, this corporation shall not without first
obtaining the approval (by vote or written consent, as provided by law) of the
holders of at least a majority of the then outstanding shares of Series E
Preferred Stock (voting in accordance with Section 5) alter or change the
powers, preferences or special rights of the Series E Preferred Stock so as to
affect them adversely, without so affecting the entire class of Preferred
Stock.

         7.  Status of Converted or Redeemed Stock.  In the event any shares of
Series A Preferred Stock, Series B Preferred Stock, Series C Preferred Stock,
Series D Preferred Stock or Series E Preferred Stock shall be redeemed or
converted pursuant to Section 3 or Section 4 hereof, the shares so converted or
redeemed shall be cancelled and shall not be issuable by the corporation, and
the Restated Certificate of this corporation shall be appropriately amended to
effect the corresponding reduction in this corporation's authorized capital
stock.





                                      -20-
<PAGE>   21
         8.  No Preemptive Rights.  The holders of Preferred Stock shall not
have any preemptive rights.

         (C)  Common Stock.

         1.  Relative Rights of Preferred Stock and Common Stock.  All
preferences, voting powers, relative, participating, optional or other special
rights and privileges, and qualifications, limitations, or restrictions of the
Common Stock are expressly made subject and subordinate to those that may be
fixed with respect to any shares of Preferred Stock.

         2.  Voting Rights.  Except as otherwise required by law or this
Restated Certificate of Incorporation, each holder of Common Stock shall have
one vote in respect of each share of stock held by him of record on the books
of the corporation for the election of directors and on all matters submitted
to a vote of stockholders of the corporation.

         3.  Dividends.  Subject to the preferential rights of Preferred Stock,
the holders of shares of Common Stock shall be entitled to receive, when and if
declared by the board of directors, out of the assets of the corporation which
are by law available therefor, dividends payable either in cash, in property or
in shares of capital stock.

         4.  Dissolution, Liquidation or Winding Up.  In the event of any
dissolution, liquidation or winding up of the affairs of the corporation,
Common Stock shall be entitled to receive assets of the corporation as provided
by this Restated Certificate of Incorporation.

         5.  No Preemptive Rights.  The holders of Common Stock shall not have
any preemptive rights.

                                   ARTICLE V

         The corporation is to have perpetual existence.

                                   ARTICLE VI

         In furtherance and not in limitation of the powers conferred by the
laws of the State of Delaware:

                 (A)  The board of directors of the corporation is expressly
         authorized to adopt, amend or repeal the bylaws of the corporation.

                 (B)  Elections of directors need not be by written ballot
         unless the bylaws of the corporation shall so provide.





                                      -21-
<PAGE>   22
                 (C)  The books of the corporation may be kept at such place
         within or without the State of Delaware as the bylaws of the
         corporation may provide or as may be designated from time to time by
         the board of directors of the corporation.

                                   ARTICLE VII

         A director of the corporation shall not be personally liable to the
corporation or its stockholders for monetary damages for breach of fiduciary
duty as a director, except for liability (a) for any breach of the director's
duty of loyalty to the corporation or its stockholders, (b) for acts or
omissions not in good faith or which involve intentional misconduct or a
knowing violation of law, (c) under section 174 of the Delaware General
Corporation Law or (d) for any transaction
 from which the director derived an improper personal benefit.

                                   ARTICLE VIII

         The corporation reserves the right to amend or repeal any provision
contained in this Restated Certificate of Incorporation, in the manner now or
hereafter prescribed by statute, and all rights conferred upon a stockholder
herein are granted subject to this reservation.

         FOURTH.  This Restated Certificate of Incorporation was duly adopted
by the Board of Directors of this corporation.

         FIFTH.  This Restated Certificate of Incorporation was duly adopted by
written consent of the stockholders in accordance with sections 228, 245 and
242 of the General Corporation Law of the State of Delaware and written notice
of such action has been given as provided in section 228.





                                      -22-
<PAGE>   23
         IN WITNESS WHEREOF,  said Biosite Diagnostics Incorporated has caused
its corporate seal to be hereunto affixed and this certificate to be signed by
its President, Kim D. Blickenstaff, and its Secretary, Kim D. Blickenstaff,
this 25th day of November, 1992.




                                       BIOSITE DIAGNOSTICS INCORPORATED



                                       By    /s/  KIM D. BLICKENSTAFF    
                                         ----------------------------------
                                                  Kim D. Blickenstaff
                                                        President

Attest:



/s/  KIM D. BLICKENSTAFF
- ------------------------------
     KIM D. Blickenstaff
         Secretary






                                      -23-

<PAGE>   1
                                                              EXHIBIT 3.(i)2


                            CERTIFICATE OF AMENDMENT
                                   OF RESTATED
                          CERTIFICATE OF INCORPORATION
                                       OF
                        BIOSITE DIAGNOSTICS INCORPORATED


                  Biosite Diagnostics Incorporated, a corporation organized and
existing under and by virtue of the General Corporation Law of the State of
Delaware, DOES HEREBY CERTIFY:

                  FIRST: That resolutions were duly adopted by the Board of
Directors of Biosite Diagnostics Incorporated, providing that the Restated
Certificate of Incorporation of the Corporation be amended by changing so much
of Section (A) of Article IV as now reads:

                                   "ARTICLE IV

         (A) Classes of Stock. The total number of shares of all classes of
capital stock which the corporation shall have authority to issue is Twenty
Million Three Hundred Twenty-Eight Thousand Eight Hundred Forty-Seven
(20,328,847) of which Twelve Million (12,000,000) shares of the par value of One
Cent ($.01) each shall be Common Stock (the "Common Stock") and Eight Million
Three Hundred Twenty-Eight Thousand Eight Hundred Forty-Seven (8,328,847)
shares of the par value of One Cent ($.01) each shall be Preferred Stock (the
"Preferred Stock").

         The Preferred Stock shall be designated the "Series A Preferred Stock,"
the "Series B Preferred Stock," the "Series C Preferred Stock," the "Series D
Preferred Stock" and the Series E Preferred Stock, which series shall consist of
610,000 shares, 2,156,336 shares, 2,204,167 shares, 1,900,010 shares and
1,458,334 shares, respectively.

         Subject to Section 6, the Preferred Stock may be issued from time to
time in one or more series. Except for the Series A Preferred Stock, the Series
B Preferred Stock, the Series C Preferred Stock, the Series D Preferred Stock
and the Series E Preferred Stock, the Board of Directors is authorized to fix
the number of shares of any series of Preferred Stock and to determine the
designation of any such shares. The Board of Directors is also authorized to
determine or alter the rights (including, but not limited to, the voting
rights), preferences, privileges and restrictions granted to or imposed upon any
wholly unissued series of Preferred Stock, and within the limits and
restrictions stated in any resolution or resolutions of the Board of Directors
originally fixing the number of shares constituting any series, to increase or
decrease (but not below the number of shares of such series then outstanding)
the number of shares of any such series subsequent to the issue of shares of
that series by filing a certificate pursuant to the applicable law of the State
of Delaware."

to read as follows:
<PAGE>   2
                                   "ARTICLE IV

         (A) Classes of Stock. The total number of shares of all classes of
capital stock which the corporation shall have authority to issue is Thirty
Million (30,000,000) of which Twenty-One Million Six Hundred Seventy-One
Thousand One Hundred Fifty-Three (21,671,153) shares of the par value of One
Cent ($.01) each shall be Common Stock (the "Common Stock") and Eight Million
Three Hundred Twenty-Eight Thousand Eight Hundred Forty-Seven (8,328,847)
shares of the par value of One Cent ($.01) each shall be Preferred Stock (the
"Preferred Stock").

         The Preferred Stock shall be designated the "Series A Preferred Stock,"
the "Series B Preferred Stock," the "Series C Preferred Stock," the "Series D
Preferred Stock" and the Series E Preferred Stock, which series shall consist of
610,000 shares, 2,156,336 shares, 2,204,167 shares, 1,900,010 shares and
1,458,334 shares, respectively.

         Subject to Section 6, the Preferred Stock may be issued from time to
time in one or more series. Except for the Series A Preferred Stock, the Series
B Preferred Stock, the Series C Preferred Stock, the Series D Preferred Stock
and the Series E Preferred Stock, the Board of Directors is authorized to fix
the number of shares of any series of Preferred Stock and to determine the
designation of any such shares. The Board of Directors is also authorized to
determine or alter the rights (including, but not limited to, the voting
rights), preferences, privileges and restrictions granted to or imposed upon any
wholly unissued series of Preferred Stock, and within the limits and
restrictions stated in any resolution or resolutions of the Board of Directors
originally fixing the number of shares constituting any series, to increase or
decrease (but not below the number of shares of such series then outstanding)
the number of shares of any such series subsequent to the issue of shares of
that series by filing a certificate pursuant to the applicable law of the State
of Delaware."



                                       -2-

<PAGE>   3
                  SECOND: That said amendment was duly adopted in accordance
with the provisions of section 242 of the General Corporation Law of the State
of Delaware. Written consent of the stockholders has been given with respect to
the foregoing amendment in accordance with section 228 of the General
Corporation Law of the State of Delaware, and written notice has been given as
provided in section 228.

                  IN WITNESS WHEREOF, said corporation has caused this
certificate to be signed by Kim D. Blickenstaff, its President, and attested by
Christopher J. Twomey, its Assistant Secretary, as of this ____ day of
__________, 1997.



                                               By _____________________________
                                                       Kim D. Blickenstaff
                                                            President


Attest:



___________________________________
   Christopher J. Twomey
   Assistant Secretary


                                      -3-


<PAGE>   1

                                                                 Exhibit 3.(i)3



                                    RESTATED
                          CERTIFICATE OF INCORPORATION
                                       OF
                        BIOSITE DIAGNOSTICS INCORPORATED


         Biosite Diagnostics Incorporated, a corporation organized and existing
under the laws of the State of Delaware, hereby certifies as follows:

         FIRST.  The name of the corporation is Biosite Diagnostics
Incorporated.

         SECOND. The date of filing of the corporation's original Certificate
of Incorporation with the Secretary of State of Delaware was March 30, 1988.

         THIRD.  The Certificate of Incorporation of the corporation shall be
amended and restated to read in full as follows:


                                   ARTICLE I

         The name of the corporation is Biosite Diagnostics Incorporated.


                                   ARTICLE II

         The address of its registered office in the State of Delaware is
Corporation Trust Center, 1209 Orange Street, in the City of Wilmington, County
of New Castle, Delaware 19801.  The name of its registered agent at such
address is The Corporation Trust Company.


                                  ARTICLE III

         The nature of the business or purposes to be conducted or promoted is
medical diagnostic products and otherwise to engage in any lawful act or
activity for which corporations may be organized under the General Corporation
Law of Delaware.


                                   ARTICLE IV

                 (A)      Classes of Stock.  The total number of shares of all
classes of capital stock which the corporation shall have authority to issue is
thirty million (30,000,000), of which twenty five million (25,000,000) shares
of the par value of one cent ($.01) each shall be Common Stock (the "Common
Stock") and five million (5,000,000) shares of the par value
<PAGE>   2
of one cent ($.01) each shall be Preferred Stock (the "Preferred Stock").  The
number of authorized shares of Common Stock or Preferred Stock may be increased
or decreased (but not below the number of shares thereof then outstanding) by
the affirmative vote of the holders of a majority of the then outstanding
shares of Common Stock, without a vote of the holders of the Preferred Stock,
or of any series thereof, unless a vote of any such Preferred Stock holders is
required pursuant to the provisions established by the Board of Directors of
this corporation (the "Board of Directors") in the resolution or resolutions
providing for the issue of such Preferred Stock, and if such holders of such
Preferred Stock are so entitled to vote thereon, then, except as may otherwise
be set forth in this Restated Certificate of Incorporation, the only
stockholder approval required shall be the affirmative vote of a majority of
the combined voting power of the Common Stock and the Preferred Stock so
entitled to vote.

                 (B)      Preferred Stock.  The Preferred Stock may be issued
from time to time in one or more series.  The Board of Directors is expressly
authorized to provide for the issue, in one or more series, of all or any of
the remaining shares of Preferred Stock and, in the resolution or resolutions
providing for such issue, to establish for each such series the number of its
shares, the voting powers, full or limited, of the shares of such series, or
that such shares shall have no voting powers, and the designations, preferences
and relative, participating, optional or other special rights of the shares of
such series, and the qualifications, limitations or restrictions thereof.  The
Board of Directors is also expressly authorized (unless forbidden in the
resolution or resolutions providing for such issue) to increase or decrease
(but not below the number of shares of the series then outstanding) the number
of shares of any series subsequent to the issuance of shares of that series.
In case the number of shares of any such series shall be so decreased, the
shares constituting such decrease shall resume the status that they had prior
to the adoption of the resolution originally fixing the number of shares of
such series.

         (C)  Common Stock

                 1.  Relative Rights of Preferred Stock and Common Stock.  All
preferences, voting powers, relative, participating, optional or other special
rights and privileges, and qualifications, limitations, or restrictions of the
Common Stock are expressly made subject and subordinate to those that may be
fixed with respect to any shares of the Preferred Stock.

                 2.  Voting Rights.  Except as otherwise required by law or
this Restated Certificate of Incorporation, each holder of Common Stock shall
have one vote in respect of each share of stock held by such holder of record
on the books of the


                                       2


<PAGE>   3
corporation for the election of directors and on all matters submitted to a
vote of stockholders of the corporation.

                 3.  Dividends.  Subject to the preferential rights of the
Preferred Stock, the holders of shares of Common Stock shall be entitled to
receive, when and if declared by the Board of Directors, out of the assets of
the corporation which are by law available therefor, dividends payable either
in cash, in property or in shares of capital stock.

                 4.  Dissolution, Liquidation or Winding Up.  In the event of
any dissolution, liquidation or winding up of the affairs of the corporation,
after distribution in full of the preferential amounts, if any, to be
distributed to the holders of shares of the Preferred Stock, holders of Common
Stock shall be entitled, unless otherwise provided by law or this Restated
Certificate of Incorporation, to receive all of the remaining assets of the
corporation of whatever kind available for distribution to stockholders ratably
in proportion to the number of shares of Common Stock held by them
respectively.


                                   ARTICLE V

         The corporation is to have perpetual existence.


                                   ARTICLE VI

         In furtherance and not in limitation of the powers conferred by the
laws of the State of Delaware:

         (A)  Amendment to Charter.  Notwithstanding any other provision of
this Certificate of Incorporation, the affirmative vote of the holders of at
least sixty-six and two-thirds percent (66 2/3%) of the voting power of all of
the then outstanding shares of the stock of the corporation entitled to vote
generally in the election of directors, voting together as a single class,
shall be required to amend in any respect or repeal this Article VI and
Articles VII and VIII below.

         (B)  Amendment of Bylaws.  The Board of Directors of the corporation
is expressly authorized to adopt, amend or repeal the Bylaws of the
corporation, provided, however, that any adoption, amendment or repeal of
Bylaws of the corporation by the Board of Directors shall require the approval
of at least  sixty-six and two-thirds percent (66 2/3%) of the total number of
authorized directors (whether or not there exist any vacancies in previously
authorized directorships at the time any resolution providing for adoption,
amendment or repeal is presented to the Board of Directors).  The stockholders
shall also have power to adopt, amend or repeal Bylaws of the corporation,
provided, however, that in addition to any vote of the holders of any class or
series of stock of the corporation required by law or by this Restated
Certificate of





                                      -3-
<PAGE>   4
Incorporation the affirmative vote of the holders of at least  sixty-six and
two-thirds percent (66 2/3%) of the voting power of all of the then outstanding
shares of the stock of the corporation entitled to vote generally in the
election of directors, voting together as a single class, shall be required for
such adoption, amendment or repeal by the stockholders of any provisions of the
Bylaws of the corporation.

         (C)  Written Ballot Not Required.  Elections of directors need not be
by written ballot unless the Bylaws of the corporation shall so provide.

         (D)  Classified Board.  The Board of Directors shall be divided into
three classes, designated Class I, Class II and Class III, as nearly equal in
number as possible, and the term of office of directors of one class shall
expire at each annual meeting of stockholders, and in all cases as to each
director until his or her successor shall be elected and shall qualify or until
his or her earlier resignation, removal from office, death or incapacity.
Additional directorships resulting from an increase in number of directors
shall be apportioned among the classes as equally as possible.  At each annual
meeting of stockholders the number of directors equal to the number of
directors of the class whose term expires at the time of such meeting (or, if
less, the number of directors properly nominated and qualified for election)
shall be elected to hold office until the third succeeding annual meeting of
stockholders after their election.

         (E)     No Action by Written Consent.  No action required or permitted
to be taken at any annual or special meeting of the stockholders may be taken
without a meeting and the power of stockholders to consent in writing, without
a meeting, to the taking of any action is specifically denied.  Special
meetings of the stockholders of the corporation may be called only by the
Chairman of the Board or the Chief Executive Officer of the corporation or by a
resolution adopted by the affirmative vote of a majority of the Board of
Directors.

         (F)     Corporate Records.  The books of the corporation may be kept
at such place within or without the State of Delaware as the Bylaws of the
corporation may provide or as may be designated from time to time by the Board
of Directors of the corporation.


                                  ARTICLE VII

         (A)     No Personal Liability.  A director of the corporation shall
not be personally liable to the corporation or its stockholders for monetary
damages for breach of fiduciary duty as a director, except for liability (i)
for any breach of the director's duty of loyalty to the corporation or its
stockholders, (ii) for acts or omissions not in good faith





                                      -4-
<PAGE>   5
or which involve intentional misconduct or a knowing violation of law, (iii)
under section 174 of the Delaware General Corporation Law or (iv) for any
transaction from which the director derived an improper personal benefit.

         (B)     Indemnification.  Each person who is or is made a party or is
threatened to be made a party to or is involved in any action, suit or
proceeding, whether civil, criminal, administrative or investigative
(hereinafter a "proceeding"), by reason of the fact that he or she, or a person
of whom he or she is the legal representative, is or was a director or officer
of the corporation or is or was serving at the request of the corporation as a
director, officer, employee or agent of another corporation or of a
partnership, joint venture, trust or other enterprise, including service with
respect to employee benefit plans, whether the basis of such proceeding is
alleged action in an official capacity as a director, officer, employee or
agent or in any other capacity while serving as a director, officer, employee
or agent, shall be indemnified and held harmless by the corporation to the
fullest extent authorized by the Delaware General Corporation Law, as the same
exists or may hereafter be amended (but, in the case of any such amendment,
only to the extent that such amendment permits the corporation to provide
broader indemnification rights than said law permitted the corporation to
provide prior to such amendment), against all expense, liability and loss
(including attorneys' fees, judgments, fines, ERISA excise taxes or penalties
and amounts paid or to be paid in settlement) reasonably incurred or suffered
by such person in connection therewith and such indemnification shall continue
as to a person who has ceased to be a director, officer, employee or agent and
shall inure to the benefit of his or her heirs, executors and administrators;
provided, however, that, except as provided in the second paragraph hereof, the
corporation shall indemnify any such person seeking indemnification in
connection with a proceeding (or part thereof) initiated by such person only if
such proceeding (or part thereof) was authorized by the Board of Directors of
the corporation.  The right to indemnification conferred in this section shall
be a contract right and shall include the right to be paid by the corporation
any expenses incurred in defending any such proceeding in advance of its final
disposition; provided, however, that, if the Delaware General Corporation Law
requires, the payment of such expenses incurred by a director or officer in his
or her capacity as a director or officer (and not in any other capacity in
which service was or is rendered by such person while a director or officer,
including, without limitation, service to an employee benefit plan) in advance
of the final disposition of a proceeding, shall be made only upon delivery to
the corporation of an undertaking, by or on behalf of such director or officer,
to repay all amounts so advanced if it shall ultimately be determined that such
director or officer is not entitled to be indemnified under this section or
otherwise.  The corporation may, by action of its Board of Directors,





                                      -5-
<PAGE>   6
provide indemnification to employees and agents of the corporation with the
same scope and effect as the foregoing indemnification of directors and
officers.

         If a claim under the first paragraph of this section is not paid in
full by the corporation within thirty (30) days after a written claim has been
received by the corporation, the claimant may at any time thereafter bring suit
against the corporation to recover the unpaid amount of the claim and, if
successful in whole or in part, the claimant shall be entitled to be paid also
the expense of prosecuting such claim.  It shall be a defense to any such
action (other than an action brought to enforce a claim for expenses incurred
in defending any proceeding in advance of its final disposition where the
required undertaking, if any is required, has been tendered to the corporation)
that the claimant has not met the standards of conduct which make it
permissible under the Delaware General Corporation Law for the corporation to
indemnify the claimant for the amount claimed, but the burden of proving such
defense shall be on the corporation.  Neither the failure of the corporation
(including its Board of Directors, independent legal counsel, or its
stockholders) to have made a determination prior to the commencement of such
action that indemnification of the claimant is proper in the circumstances
because he or she has met the applicable standard of conduct set forth in the
Delaware General Corporation Law, nor an actual determination by the
corporation (including its Board of Directors, independent legal counsel, or
its stockholders) that the claimant has not met such applicable standard of
conduct, shall be a defense to the action or create a presumption that the
claimant has not met the applicable standard of conduct.

         The right to indemnification and the payment of expenses incurred in
defending a proceeding in advance of its final disposition conferred in this
section shall not be exclusive of any other right which any person may have or
hereafter acquire under any statute, provision of the Restated Certificate of
Incorporation, Bylaw, agreement, vote of stockholders or disinterested
directors or otherwise.

         (C)  The corporation may maintain insurance, at its expense, to
protect itself and any director, officer, employee or agent of the corporation
or another corporation, partnership, joint venture, trust or other enterprise
against any such expense, liability or loss, whether or not the corporation
would have the power to indemnify such person against such expense, liability
or loss under the Delaware General Corporation Law.

         (D)  Any repeal or modification of the foregoing provisions of this
Article VII shall not adversely affect any right or protection of any director,
officer, employee or agent of the corporation existing at the time of such
repeal or modification.





                                      -6-
<PAGE>   7
                                  ARTICLE VIII

         The corporation reserves the right to amend or repeal any provision
contained in this Certificate of Incorporation, in the manner now or hereafter
prescribed by statute, and all rights conferred upon a stockholder herein are
granted subject to this reservation.


         FOURTH. This Restated Certificate of Incorporation was duly adopted by
the Board of Directors of the corporation.

         FIFTH.  This Restated Certificate of Incorporation was duly adopted by
the stockholders in accordance with sections 242 and 245 of the General
Corporation Law of the State of Delaware.  Written consent of the stockholders
has been given with respect to this Restated Certificate of Incorporation in
accordance with section 228 of the General Corporation Law of the State of
Delaware, and written notice has been given as provided in section 228.

         IN WITNESS WHEREOF, said Biosite Diagnostics Incorporated has caused
this Certificate to be signed by its President, Kim D.  Blickenstaff, and
attested to by its Assistant Secretary, Christopher J. Twomey, this ___ day of
_______, 1997.






                                       By
                                         ---------------------------------
                                                  Kim D. Blickenstaff
                                                        President


Attest:



____________________________
   Christopher J. Twomey
    Assistant Secretary
                       






                                      -7-

<PAGE>   1





                                                                 Exhibit 3.(ii)1


                                                       As adopted April 13, 1988


                                     BYLAWS
                                       OF
                        BIOSITE DIAGNOSTICS INCORPORATED


                                   ARTICLE I

                            MEETING OF STOCKHOLDERS


         Section 1.  Place of Meetings.  All meetings of the stockholders shall
be held at such place within or without the State of Delaware as may be fixed
from time to time by the board of directors or the chief executive officer, of
if not so designated, at the registered office of the corporation.

         Section 2.  Annual Meeting.  Annual meetings of stockholders shall be
held on the second Tuesday in April in each year if not a legal holiday, and if
a legal holiday, then on the next secular day following, at 10:00 a.m., or at
such other date and time as shall be designated from time to time by the board
of directors or the chief executive officer, at which meeting the stockholders
shall elect by a plurality vote a board of directors and shall transact such
other business as may properly be brought before the meeting.  If no annual
meeting is held in accordance with the foregoing provisions, the board of
directors shall cause the meeting to be held as soon thereafter as convenient,
which meeting shall be designated a special meeting in lieu of annual meeting.

         Section 3.  Special Meetings.  Special meetings of the stockholders,
for any purpose or purposes, may, unless otherwise prescribed by statute or by
the certificate of incorporation, be called by the board of directors or the
chief executive officer and shall be called by the chief executive officer or
secretary at the request in writing of a majority of the board of directors, or
at the request in writing of stockholders owning ten percent of the entire
capital stock of the corporation issued and outstanding and entitled to vote.
Such request shall state the purpose or purposes of the proposed meeting.
Business transacted at any special meeting shall be limited to matters relating
to the purpose or purposes stated in the notice of meeting.

         Section 4.  Notice of Meetings.  Except as otherwise provided by law,
written notice of each meeting of stockholders, annual or special, stating the
place, date and hour of the meeting and, in the case of a special meeting, the
purpose or purposes for which the meeting is called, shall be given not less
than ten or more than sixty days before the date of the meeting, to each
stockholder entitled to vote at such meeting.




                                       -1-
<PAGE>   2
         Section 5.  Voting List.  The officer who has charge of the stock
ledger of the corporation shall prepare and make, at least ten days before
every meeting of stockholders, a complete list of the stockholders entitled to
vote at the meeting, arranged in alphabetical order, and showing the address of
each stockholder and the number of shares registered in the name of each
stockholder.  Such list shall be open to the examination of any stockholder,
for any purpose germane to the meeting, during ordinary business hours, for a
period of at least ten days prior to the meeting, either at a place within the
city or town where the meeting is to be held, which place shall be specified in
the notice of the meeting, or, if not so specified, at the place where the
meeting is to be held  The list shall also be produced and kept at the time and
place of the meeting during the whole time thereof, and may be inspected by any
stockholder who is present.

         Section 6.  Quorum.  The holders of a majority of the stock issued and
outstanding and entitled to vote thereat, present in person or represented by
proxy, shall constitute a quorum at all meetings of the stockholders for the
transaction of business, except as otherwise provided by statute, the
certificate of incorporation or these bylaws.

         Section 7.  Adjournments.  Any meeting of stockholders may be
adjourned from time to time to any other time and to any other place at which a
meeting of stockholders may be held under these bylaws, which time and place
shall be announced at the meeting, by a majority of the stockholders present in
person or represented by proxy at the meeting and entitled to vote, though less
than a quorum, or, if no stockholder is present or represented by proxy, by any
officer entitled to preside at or to act as secretary of such meeting, without
notice other than announcement at the meeting, until a quorum shall be present
or represented.  At such adjourned meeting at which a quorum shall be present
or represented, any business may be transacted which might have been transacted
at the original meeting.  If the adjournment is for more than thirty days, or
if after the adjournment a new record date is fixed for the adjourned meeting,
a notice of the adjourned meeting shall be given to each stockholder of record
entitled to vote at the meeting.

         Section 8.  Action at Meetings.  When a quorum is present at any
meeting, the vote of the holders of a majority of the stock present in person
or represented by proxy and entitled to vote on the question shall decide any
question brought before such meeting, unless the question is one upon which by
express provision of the law, the certificate of incorporation or these bylaws,
a different vote is required, in which case such express provision shall govern
and control the decision of such question.

         Section 9.  Voting and Proxies.  Unless otherwise provided in the
certificate of incorporation, each stockholder shall at





                                      -2-
<PAGE>   3
every meeting of the stockholders be entitled to one vote for each share of
capital stock having voting power held of record by such stockholder.  Each
stockholder entitled to vote at a meeting of stockholders, or to express
consent or dissent to corporate action in writing without a meeting, may
authorize another person or persons to act for him by proxy, but no such proxy
shall be voted or acted upon after three years from its date, unless the proxy
provides for a longer period.

         Section 10.  Action Without Meeting.  Any action required to be taken
at any annual or special meeting of stockholders, or any action which may be
taken at any annual or special meeting of such stockholders, may be taken
without a meeting, without prior notice and without a vote, if a consent in
writing, setting forth the action so taken, shall be signed by the holders of
outstanding stock having not less than the minimum number of votes that would
be necessary to authorize or take such action at a meeting at which all shares
entitled to vote thereon were present and voted.  Prompt notice of the taking
of the corporate action without a meeting by less than unanimous written
consent shall be given to those stockholders who have not consented in writing.


                                   ARTICLE II

                                   DIRECTORS

         Section 1.  Number, Election, Tenure and Qualification.  The number of
directors which shall constitute the whole board shall not be less than three
nor more than eight.  Within such limit, the number of directors shall be
determined by resolution of the board of directors or by the stockholders at
the annual meeting or at any special meeting of stockholders.  The directors
shall be elected at the annual meeting or at any special meeting of the
stockholders, except as provided in Section 3 of this Article, and each
director elected shall hold office until his successor is elected and
qualified, unless sooner displaced.  Directors need not be stockholders.

         Section 2.  Enlargement.  The number of the board of directors may be
increased at any time by vote of a majority of the directors then in office.

         Section 3.  Vacancies.  Vacancies and newly created directorships
resulting from any increase in the authorized number of directors may be filled
by a majority of the directors then in office, though less than a quorum, or by
a sole remaining director, and the directors so chosen shall hold office until
the next annual election and until their successors are duly elected and shall
qualify, unless sooner displaced.  If there are no directors in office, then an
election of directors may be held in the manner provided by statute.  In the
event of a vacancy in the board of directors, the remaining directors,





                                      -3-
<PAGE>   4
except as otherwise provided by law or these bylaws, may exercise the powers of
the full board until the vacancy is filled.

         Section 4.  Resignation and Removal.  Any director may resign at any
time upon written notice to the corporation at its principal place of business
or to the chief executive officer or the secretary.  Such resignation shall be
effective upon receipt unless it is specified to be effective at some other
time or upon the happening of some other event.  Any director or the entire
board of directors may be removed, with or without cause, by the holders of a
majority of the shares then entitled to vote at an election of directors,
unless otherwise specified by law or the certificate of incorporation.

         Section 5.  General Powers.  The business and affairs of the
corporation shall be managed by its board of directors, which may exercise all
powers of the corporation and do all such lawful acts and things as are not by
statute or by the certificate of incorporation or by these bylaws directed or
required to be exercised or done by the stockholders.

         Section 6.  Chairman of the Board.  If the board of directors appoints
a chairman of the board, he shall, when present, preside at all meetings of the
stockholders and the board of directors.  He shall perform such duties and
possess such powers as are customarily vested in the office of the chairman of
the board or as may be vested in him by the board of directors.

         Section 7.  Place of Meetings.  The board of directors may hold
meetings, both regular and special, either within or without the State of
Delaware.

         Section 8.  Regular Meetings.  Regular meetings of the board of
directors may be held without notice at such time and at such place as shall
from time to time be determined by the board; provided that any director who is
absent when such a determination is made shall be given prompt notice of such
determination.  A regular meeting of the board of directors may be held without
notice immediately after and at the same place as the annual meeting of
stockholders.

         Section 9.  Special Meetings.  Special meetings of the board may be
called by the chief executive officer, secretary, or on the written request of
two or more directors, or by one director in the event that there is only one
director in office.  Two days' notice to each director, either personally or by
telegram, cable, telecopy, commercial delivery service, telex or similar means
sent to his business or home address, or three days' notice by written notice
deposited in the mail, shall be given to each director by the secretary or by
the officer or one of the directors calling the meeting.  A notice or waiver of
notice of a meeting of the board of directors need not specify the purposes of
the meeting.





                                      -4-
<PAGE>   5
         Section 10.  Quorum, Action at Meeting, Adjournments.  At all meetings
of the board, a majority of the board of directors then in office, but in no
event less than one third of the entire board, shall constitute a quorum for
the transaction of business and the act of a majority of the directors present
at any meeting at which there is a quorum shall be the act of the board of
directors, except as may be otherwise specifically provided by law or by the
certificate of incorporation.  For purposes of this section, the term "entire
board" shall mean the number of directors last fixed by the stockholders or
directors, as the case may be, in accordance with law and these bylaws;
provided, however, that if less than all the number so fixed of directors were
elected, the "entire board" shall mean the greatest number of directors so
elected to hold office at any one time pursuant to such authorization.  If a
quorum shall not be present at any meeting of the board of directors, a
majority of the directors present thereat may adjourn the meeting from time to
time, without notice other than announcement at the meeting, until a quorum
shall be present.

         Section 11.  Action by Consent.  Unless otherwise restricted by the
certificate of incorporation or these bylaws, any action required or permitted
to be taken at any meeting of the board of directors or of any committee
thereof may be taken without a meeting, if all members of the board or
committee, as the case may be, consent thereto in writing, and the writing or
writings are filed with the minutes of proceedings of the board or committee.

         Section 12.  Telephonic Meetings.  Unless otherwise restricted by the
certificate of incorporation or these bylaws, members of the board of directors
or of any committee thereof may participate in a meeting of the board of
directors or of any committee, as the case may be, by means of conference
telephone or similar communications equipment by means of which all persons
participating in the meeting can hear each other, and such participation in a
meeting shall constitute presence in person at the meeting.

         Section 13.  Committees.  The board of directors may, by resolution
passed by a majority of the whole board, designate one or more committees, each
committee to consist of one or more of the directors of the corporation.  The
board may designate one or more directors as alternate members of any
committee, who may replace any absent or disqualified member at any meeting of
the committee.  Any such committee, to the extent provided in the resolution of
the board of directors, shall have and may exercise all the powers and
authority of the board of directors in the management of the business and
affairs of the corporation, and may authorize the seal of the corporation to be
affixed to all papers which may require it; but no such committee shall have
the power or authority in reference to amending the certificate of
incorporation, adopting an agreement of merger or consolidation, recommending
to the stockholders the





                                      -5-
<PAGE>   6
sale, lease or exchange of all or substantially all of the corporation's
property and assets, recommending to the stockholders a dissolution of the
corporation or a revocation of a dissolution, or amending the bylaws of the
corporation; and, unless the resolution designating such committee or the
certificate of incorporation expressly so provide, no such committee shall have
the power or authority to declare a dividend or to authorize the issuance of
stock.  Such committee or committees shall have such name or names as may be
determined from time to time by resolution adopted by the board of directors.
Each committee shall keep regular minutes of its meetings and make such reports
to the board of directors as the board of directors may request.  Except as the
board of directors may otherwise determine, any committee may make rules for
the conduct of its business, but unless otherwise provided by the directors or
in such rules, its business shall be conducted as nearly as possible in the
same manner as is provided in these bylaws for the conduct of its business by
the board of directors.

                 Section 14.  Compensation.  Unless otherwise restricted by the
certificate of incorporation or these bylaws, the board of directors shall have
the authority to fix from time to time the compensation of directors.  The
directors may be paid their expenses, if any, of attendance at each meeting of
the board of directors and the performance of their responsibilities as
directors and may be paid a fixed sum for attendance at each meeting of the
board of directors and/or a stated salary as director.  No such payment shall
preclude any director from serving the corporation or its parent or subsidiary
corporations in any other capacity and receiving compensation therefor.  The
board of directors may also allow compensation for members of special or
standing committees for service on such committees.


                                  ARTICLE III

                                    OFFICERS

         Section 1.  Enumeration.  The officers of the corporation shall be
chosen by the board of directors and shall be a president, a secretary and a
treasurer and such other officers with such titles, terms of office and duties
as the board of directors may from time to time determine, including a chairman
of the board, one or more vice-presidents, and one or more assistant
secretaries and assistant treasurers.  If authorized by resolution of the board
of directors, the chief executive officer may be empowered to appoint from time
to time assistant secretaries and assistant treasurers.  Any number of offices
may be held by the same person, unless the certificate of incorporation or
these bylaws otherwise provide.

         Section 2.  Election.  The board of directors at its first meeting
after each annual meeting of stockholders shall choose a president, a secretary
and a treasurer.  Other officers may be





                                      -6-
<PAGE>   7
appointed by the board of directors at such meeting, at any other meeting, or
by written consent.

         Section 3.  Tenure.  The officers of the corporation shall hold office
until their successors are chosen and qualify, unless a different term is
specified in the vote choosing or appointing him, or until his earlier death,
resignation or removal.  Any officer elected or appointed by the board of
directors or by the chief executive officer may be removed at any time by the
affirmative vote of a majority of the board of directors or a committee duly
authorized to do so, except that any officer appointed by the chief executive
officer may also be removed at any time by the chief executive officer.  Any
vacancy occurring in any office of the corporation may be filled by the board
of directors, at its discretion.  Any officer may resign by delivering his
written resignation to the corporation at its principal place of business or to
the chief executive officer or the secretary.  Such resignation shall be
effective upon receipt unless it is specified to be effective at some other
time or upon the happening of some other event.

         Section 4.  President.  The president shall be the chief operating
officer of the corporation.  He shall also be the chief executive officer
unless the board of directors otherwise provides.  The president shall, unless
the board of directors provides otherwise in a specific instance or generally,
preside at all meetings of the stockholders and the board of directors, have
general and active management of the business of the corporation and see that
all orders and resolutions of the board of directors are carried into effect.
The president shall execute bonds, mortgages, and other contracts requiring a
seal, under the seal of the corporation, except where required or permitted by
law to be otherwise signed and executed and except where the signing and
execution thereof shall be expressly delegated by the board of directors to
some other officer or agent of the corporation.

         Section 5.  Vice-Presidents.  In the absence of the president or in
the event of his inability or refusal to act, the vice-president, or if there
be more than one vice-president, the vice-presidents in the order designated by
the board of directors or the chief executive officer (or in the absence of any
designation, then in the order determined by their tenure in office) shall
perform the duties of the president, and when so acting, shall have all the
powers of and be subject to all the restrictions upon the president.  The
vice-presidents shall perform such other duties and have such other powers as
the board of directors or the chief executive officer may from time to time
prescribe.

         Section 6.  Secretary.  The secretary shall have such powers and
perform such duties as are incident to the office of secretary.  He shall
maintain a stock ledger and prepare lists of stockholders and their addresses
as required and shall be the





                                      -7-
<PAGE>   8
custodian of corporate records.  The secretary shall attend all meetings of the
board of directors and all meetings of the stockholders and record all the
proceedings of the meetings of the corporation and of the board of directors in
a book to be kept for that purpose and shall perform like duties for the
standing committees when required.  He shall give, or cause to be given, notice
of all meetings of the stockholders and special meetings of the board of
directors, and shall perform such other duties as may be from time to time
prescribed by the board of directors or chief executive officer, under whose
supervision he shall be.  He shall have custody of the corporate seal of the
corporation and he, or an assistant secretary, shall have authority to affix
the same to any instrument requiring it and when so affixed, it may be attested
by his signature or by the signature of such assistant secretary.  The board of
directors may give general authority to any other officer to affix the seal of
the corporation and to attest the affixing by his signature.

         Section 7.  Assistant Secretaries.  The assistant secretary, or if
there be more than one, the assistant secretaries in the order determined by
the board of directors, the chief executive officer or the secretary (or if
there be no such determination, then in the order determined by their tenure in
office), shall, in the absence of the secretary or in the event of his
inability or refusal to act, perform the duties and exercise the powers of the
secretary and shall perform such other duties and have such other powers as the
board of directors, the chief executive officer or the secretary may from time
to time prescribe.  In the absence of the secretary or any assistant secretary
at any meeting of stockholders or directors, the person presiding at the
meeting shall designate a temporary or acting secretary to keep a record of the
meeting.

         Section 8.  Treasurer.  The treasurer shall perform such duties and
shall have such powers as may be assigned to him by the board of directors or
the chief executive officer.  In addition, the treasurer shall perform such
duties and have such powers as are incident to the office of treasurer.  The
treasurer shall have the custody of the corporate funds and securities and
shall keep full and accurate accounts of receipts and disbursements in books
belonging to the corporation and shall deposit all moneys and other valuable
effects in the name and to the credit of the corporation in such depositories
as may be designated by the board of directors.  He shall disburse the funds of
the corporation as may be ordered by the board of directors, taking proper
vouchers for such disbursements, and shall render to the chief executive
officer and the board of directors, when the chief executive officer or board
of directors so requires, an account of all his transactions as treasurer and
of the financial condition of the corporation.

         Section 9.  Assistant Treasurers.  The assistant treasurer, or if
there shall be more than one, the assistant treasurers in





                                      -8-
<PAGE>   9
the order determined by the board of directors, the chief executive officer or
the treasurer (or if there be no such determination, then in the order
determined by their tenure in office), shall, in the absence of the treasurer
or in the event of his inability or refusal to act, perform the duties and
exercise the powers of the treasurer and shall perform such other duties and
have such other powers as the board of directors, the chief executive officer
or the treasurer may from time to time prescribe.

         Section 10.  Bond.  If required by the board of directors, any officer
shall give the corporation a bond in such sum and with such surety or sureties
and upon such terms and conditions as shall be satisfactory to the board of
directors, including without limitation a bond for the faithful performance of
the duties of his office and for the restoration to the corporation of all
books, papers, vouchers, money and other property or whatever kind in his
possession or under his control and belonging to the corporation.


                                   ARTICLE IV

                                    NOTICES

         Section 1.  Delivery.  Whenever, under the provisions of law, or of
the certificate of incorporation or these bylaws, written notice is required to
be given to any director or stockholder, such notice may be given by mail,
addressed to such director or stockholder, at his address as it appears on the
records of the corporation, with postage thereon prepaid, and such notice shall
be deemed to be given at the time when the same shall be deposited in the
United States mail.  Unless written notice by mail is required by law, written
notice may also be given by telegram, cable, telecopy, commercial delivery
service, telex or similar means, addressed to such director or stockholder at
his address as it appears on the records of the corporation, in which case such
notice shall be deemed to be given when delivered into the control of the
persons charged with effecting such transmission, the transmission charge to be
paid by the corporation or the person sending such notice and not by the
addressee.  Oral notice or other in-hand delivery (in person or by telephone)
shall be deemed given at the time it is actually given.

         Section 2.  Waiver of Notice.  Whenever any notice is required to be
given under the provisions of law or of the certificate of incorporation or of
these bylaws, a waiver thereof in writing, signed by the person or persons
entitled to said notice, whether before or after the time stated therein, shall
be deemed equivalent thereto.





                                      -9-
<PAGE>   10
                                   ARTICLE V

                                INDEMNIFICATION

         Section 1.  Actions Other than by or in the Right of the Corporation.
The corporation shall indemnify any person who was or is a party or is
threatened to be made a party to any threatened, pending or completed action,
suit or proceeding, whether civil, criminal, administrative or investigative
(other than an action by or in the right of the corporation) by reason of the
fact that he is or was a director, officer, employee or agent of the
corporation, or is or was serving at the request of the corporation as a
director, officer, employee or agent of another corporation, partnership, joint
venture, trust or other enterprise, against expenses (including attorneys'
fees), judgments, fines and amounts paid in settlement actually and reasonably
incurred by him in connection with such action, suit or proceeding if he acted
in good faith and in a manner he reasonably believed to be in or not opposed to
the best interests of the corporation, and, with respect to any criminal action
or proceedings, had no reasonable cause to believe his conduct was unlawful.
The termination of any action, suit or proceeding by judgment, order,
settlement, conviction, or upon a plea of nolo contendere or its equivalent,
shall not, of itself, create a presumption that the person did not act in good
faith and in a manner which he reasonably believed to be in or not opposed to
the best interests of the corporation, and, with respect to any criminal action
or proceeding, had reasonable cause to believe that his conduct was unlawful.

         Section 2.  Actions by or in the Right of the Corporation.  The
corporation shall indemnify any person who was or is a party or is threatened
to be made a party to any threatened, pending or completed action or suit by or
in the right of the corporation to procure a judgment in its favor by reason of
the fact that he is or was a director, officer, employee or agent of the
corporation, or is or was serving at the request of the corporation as a
director, officer, employee or agent of another corporation, partnership, joint
venture, trust or other enterprise against expenses (including attorneys' fees)
actually and reasonably incurred by him in connection with the defense or
settlement of such action or suit if he acted in good faith and in a manner he
reasonably believed to be in or not opposed to the best interests of the
corporation and except that no indemnification shall be made in respect of any
claim, issue or matter as to which such person shall have been adjudged to be
liable for negligence or misconduct in the performance of his duty to the
corporation unless and only to the extent that the Court of Chancery of the
State of Delaware or the court in which such action or suit was brought shall
determine upon application that, despite the adjudication of liability but in
view of all the circumstances of the case, such person is fairly and reasonably
entitled to indemnity for such expenses which the Court of





                                      -10-
<PAGE>   11
Chancery of the State of Delaware or such other court shall deem proper.

         Section 3.  Success on the Merits.  To the extent that any person
described in Section 1 or 2 of this Article V has been successful on the merits
or otherwise in defense of any action, suit or proceeding referred to in said
Sections, or in defense of any claim, issue or matter therein, he shall be
indemnified against expenses (including attorneys' fees) actually and
reasonably incurred by him in connection therewith.

         Section 4.  Specific Authorization.  Any indemnification under Section
1 or 2 of this Article V (unless ordered by a court) shall be made by the
corporation only as authorized in the specific case upon a determination that
indemnification of any person described in said Sections is proper in the
circumstances because he has met the applicable standard of conduct set forth
in said Sections.  Such determination shall be made (1) by the board of
directors by a majority vote of a quorum consisting of directors who were not
parties to such action, suit or proceeding, or (2) if such a quorum is not
obtainable, or even if obtainable a quorum of disinterested directors so
directs, by independent legal counsel in a written opinion, or (3) by the
stockholders of the corporation.

         Section 5.  Advance Payment.  Expenses incurred in defending a civil
or criminal action, suit or proceeding may be paid by the corporation in
advance of the final disposition of such action, suit or proceeding as
authorized by the board of directors in the manner provided for in Section 4 of
this Article V upon receipt of an undertaking by or on behalf of any person
described in said Section to repay such amount unless it shall ultimately be
determined that he is entitled to indemnification by the corporation as
authorized in this Article V.

         Section 6.  Non-Exclusivity.  The indemnification provided by this
Article V shall not be deemed exclusive of any other rights to which those
indemnified may be entitled under any bylaw, agreement, vote of stockholders or
disinterested directors or otherwise, both as to action in his official
capacity and as to action in another capacity while holding such office, and
shall continue as to a person who has ceased to be director, officer, employee
or agent of the corporation and shall inure to the benefit of the heirs,
executors and administrators of such a person.

         Section 7.  Insurance.  The board of directors may authorize, by a
vote of the majority of the full board, the corporation to purchase and
maintain insurance on behalf of any person who is or was a director, officer,
employee or agent of the corporation, or is or was serving at the request of
the corporation as a director, officer, employee or agent of another
corporation, partnership, joint venture, trust or other enterprise against any
liability asserted against him and incurred by him





                                      -11-
<PAGE>   12
in any such capacity, or arising out of his status as such, whether or not the
corporation would have the power to indemnify him against such liability under
the provisions of this Article V.

         Section 8.  Severability.  If any word, clause or provision of this
Article V or any award made hereunder shall for any reason be determined to be
invalid, the provisions hereof shall not otherwise be affected thereby but
shall remain in full force and effect.

         Section 9.  Intent of Article.  The intent of this Article V is to
provide for indemnification to the fullest extent permitted by Section 145 of
the General Corporation Law of Delaware.  To the extent that such Section or
any successor section may be amended or supplemented from time to time, this
Article V shall be amended automatically and construed so as to permit
indemnification to the fullest extent from time to time permitted by law.


                                   ARTICLE VI

                                 CAPITAL STOCK

         Section 1.  Certificate of Stock.  Every holder of stock in the
corporation shall be entitled to have a certificate, signed by, or in the name
of the corporation by, the chairman or vice-chairman of the board of directors,
or the president or a vice-president and the treasurer or an assistant
treasurer, or the secretary or an assistant secretary of the corporation,
certifying the number of shares owned by him in the corporation.  Any or all of
the signatures on the certificate may be a facsimile.  In case any officer,
transfer agent or registrar who has signed or whose facsimile signature has
been placed upon a certificate shall have ceased to be such officer, transfer
agent or registrar before such certificate is issued, it may be issued by the
corporation with the same effect as if he were such officer, transfer agent or
registrar at the date of issue.  Certificates may be issued for partly paid
shares and in such case upon the face or back of the certificates issued to
represent any such partly paid shares, the total amount of the consideration to
be paid therefor, and the amount paid thereon shall be specified.

         Section 2.  Lost Certificates.  The board of directors may direct a
new certificate or certificates to be issued in place of any certificate or
certificates theretofore issued by the corporation alleged to have been lost,
stolen or destroyed.  When authorizing such issue of a new certificate or
certificates, the board of directors may, in its discretion and as a condition
precedent to the issuance thereof, require the owner of such lost, stolen or
destroyed certificate or certificates, or his legal representative, to give
reasonable evidence of such loss, theft or destruction, to advertise the same
in such manner





                                      -12-
<PAGE>   13
as it shall require and/or to give the corporation a bond in such sum as it may
direct as indemnity against any claim that may be made against the corporation
with respect to the certificates alleged to have been lost, stolen or destroyed
or the issuance of such new certificate.

         Section 3.  Transfer of Stock.  Upon surrender to the corporation or
the transfer agent of the corporation of a certificate for shares, duly
endorsed or accompanied by proper evidence of succession, assignment or
authority to transfer, and proper evidence of compliance with other conditions
to rightful transfer, it shall be the duty of the corporation to issue a new
certificate to the person entitled thereto, cancel the old certificate and
record the transaction upon its books.

         Section 4.  Record Date.  In order that the corporation may determine
the stockholders entitled to notice of or to vote at any meeting of
stockholders or any adjournment thereof, or to express consent to corporate
action in writing without a meeting, or entitled to receive payment of any
dividend or other distribution or allotment of any rights, or entitled to
exercise any rights in respect of any change, conversion or exchange of stock
or for the purpose of any other lawful action, the board of directors may fix,
in advance, a record date, which shall not be more than sixty days nor less
then ten days before the date of such meeting, nor more than sixty days prior
to any other action to which such record date relates.  A determination of
stockholders of record entitled to notice of or to vote at a meeting of
stockholders shall apply to any adjournment of the meeting; provided, however,
that the board of directors may fix a new record date for the adjourned
meeting.  If no record date is fixed, the record date for determining
stockholders entitled to notice of or to vote at a meeting of stockholders
shall be at the close of business on the day before the day on which notice is
given, or, if notice is waived, at the close of business on the day before the
day on which the meeting is held.  The record date for determining stockholders
entitled to express consent to corporate action in writing without a meeting,
when no prior action by the board of directors is necessary, shall be the day
on which the first written consent is expressed.  The record date for
determining stockholders for any other purpose shall be at the close of
business on the day on which the board of directors adopts the resolution
relating to such purpose.

         Section 5.  Registered Stockholders.  The corporation shall be
entitled to recognize the exclusive right of a person registered on its books
as the owner of shares to receive dividends, and to vote as such owner, and to
hold liable for calls and assessments a person registered on its books as the
owner of shares, and shall not be bound to recognize any equitable or other
claim to or interest in such share or shares on the part of any other person,
whether or not it shall have express or other notice thereof, except as
otherwise provided by the laws of Delaware.





                                      -13-
<PAGE>   14
                                  ARTICLE VII

                              CERTAIN TRANSACTIONS


         Section 1.  Transactions with Interested Parties.  No contract or
transaction between the corporation and one or more of its directors or
officers, or between the corporation and any other corporation, partnership,
association or other organization in which one or more of its directors or
officers are directors or have a financial interest, shall be void or voidable
solely for this reason, or solely because the director or officer is present at
or participates in the meeting of the board or committee thereof which
authorizes the contract or transaction or solely because his or their votes are
counted for such purpose, if:

                 (a)      the material facts as to his relationship or interest
         and as to the contract or transaction are disclosed or are known to
         the board of directors or the committee, and the board or committee in
         good faith authorizes the contract or transaction by the affirmative
         votes of a majority of the disinterested directors, even though the
         disinterested directors be less than a quorum; or

                 (b)      the material facts as to his relationship or interest
         and as to the contract or transaction are disclosed or are known to
         the stockholders entitled to vote thereon, and the contract or
         transaction is specifically approved in good faith by vote of the
         stockholders; or

                 (c)  the contract or transaction is fair as to the corporation
         as of the time it is authorized, approved or ratified, by the board of
         directors, a committee thereof, or the stockholders.

         Section 2.  Quorum.  Common or interested directors may be counted in
determining the presence of a quorum at a meeting of the board of directors or
of a committee which authorizes the contract or transaction.


                                  ARTICLE VIII

                               GENERAL PROVISIONS

         Section 1.  Dividends.  Dividends upon the capital stock of the
corporation, if any, may be declared by the board of directors at any regular
or special meeting or by written consent, pursuant to law.  Dividends may be
paid in cash, in property, or in shares of the capital stock, subject to the
provisions of the certificate of incorporation.





                                      -14-
<PAGE>   15
         Section 2.  Reserves.  The directors may set apart out of any funds of
the corporation available for dividends a reserve or reserves for any proper
purpose and may abolish any such reserve.

         Section 3.  Checks.  All checks or demands for money and notes of the
corporation shall be signed by such officer or officers or such other person or
persons as the board of directors may from time to time designate.

         Section 4.  Fiscal Year.  The fiscal year of the corporation shall be
fixed by resolution of the board of directors.

         Section 5.  Seal.  The board of directors may, by resolution, adopt a
corporate seal.  The corporate seal shall have inscribed thereon the name of
the corporation, the year of its organization and the word "Delaware".  The
seal may be used by causing it or a facsimile thereof to be impressed or
affixed or reproduced or otherwise.  The seal may be altered from time to time
by the board of directors.


                                   ARTICLE IX

                                   AMENDMENTS

         These bylaws may be altered, amended or repealed or new bylaws may be
adopted by the stockholders or by the board of directors, when such power is
conferred upon the board of directors by the certificate of incorporation, at
any regular meeting of the stockholders or of the board of directors or at any
special meeting of the stockholders or of the board of directors provided,
however, that in the case of a regular or special meeting of stockholders,
notice of such alteration, amendment, repeal or adoption of new bylaws be
contained in the notice of such meeting.





                                      -15-

<PAGE>   1





                                                                 Exhibit 3.(ii)2



                                          Amended and Restated effective ____/97

                              AMENDED AND RESTATED
                                     BYLAWS
                                       OF
                        BIOSITE DIAGNOSTICS INCORPORATED


                                   ARTICLE I

                            MEETINGS OF STOCKHOLDERS

         Section 1.  Place of Meetings.  All meetings of the stockholders shall
be held at such place within or without the State of Delaware as may be fixed
from time to time by the Board of Directors or the chief executive officer, or
if not so designated, at the registered office of the corporation.

         Section 2.  Annual Meeting.  Annual meetings of stockholders shall be
held at such date and time as shall be designated from time to time by the
Board of Directors or the chief executive officer and stated in the notice of
meeting.  At the annual meeting the stockholders shall elect by a plurality
vote the number of directors equal to the number of directors of the class
whose term expires at such meetings (or, if fewer, the number of directors
properly nominated and qualified for election) to hold office until the third
succeeding annual meeting of stockholders after their election.

         At an annual meeting of the stockholders, only such business shall be
conducted as shall have been properly brought before the meeting.  To be
properly brought before an annual meeting, business must be specified in the
notice of meeting (or any supplement thereto) given by or at the direction of
the Board of Directors, otherwise properly brought before the meeting by or at
the direction of the Board of Directors, or otherwise properly brought before
the meeting by a stockholder.  In addition to any other applicable
requirements, for business to be properly brought before an annual meeting by a
stockholder, the stockholder must have given timely notice thereof in writing
to the secretary of the corporation.  To be timely, a stockholder's notice must
be delivered to or mailed and received at the principal executive offices of
the corporation, not less than fifty (50) days nor more than seventy-five (75)
days prior to the meeting; provided, however, that in the event that less than
sixty-five (65) days' notice or prior public disclosure of the date of the
meeting is given or made to stockholders, notice by the stockholder to be
timely must be so received not later than the close of business on the 15th day
following the day on which such notice of the date of the annual meeting was
mailed or such public disclosure was made.  A stockholder's notice to



                                       -1-
<PAGE>   2
the secretary shall set forth as to each matter the stockholder proposes to
bring before the annual meeting (i) a brief description of the business desired
to be brought before the annual meeting and the reasons for conducting such
business at the annual meeting, (ii) the name and record address of the
stockholder proposing such business, (iii) the class and number of shares of
the corporation which are beneficially owned by the stockholder and (iv) any
material interest of the stockholder in such business.

         Notwithstanding anything in these bylaws to the contrary, no business
shall be conducted at the annual meeting except in accordance with the
procedures set forth in this Section 2 by any stockholder of any business
properly brought before the annual meeting in accordance with said procedure.

         The chairman of an annual meeting shall, if the facts warrant,
determine and declare to the meeting that business was not properly brought
before the meeting in accordance with the provisions of this Section, and if
the chairman should so determine, the chairman shall so declare to the meeting,
and any such business not properly brought before the meeting shall not be
transacted.

         Section 3.  Special Meetings.  Special meetings of the stockholders,
for any purpose or purposes, may, unless otherwise prescribed by statute or by
the certificate of incorporation, be called only by the chairman of the Board
of Directors or the chief executive officer or by a resolution adopted by the
affirmative vote of a majority of the Board of Directors.  Business transacted
at any special meeting shall be limited to matters relating to the purpose or
purposes stated in the notice of meeting.

         Section 4.  Notice of Meetings.  Except as otherwise provided by law,
written notice of each meeting of stockholders, annual or special, stating the
place, date and hour of the meeting and, in the case of a special meeting, the
purpose or purposes for which the meeting is called, shall be given not less
than ten (10) nor more than sixty (60) days before the date of the meeting, to
each stockholder entitled to vote at such meeting.

         Section 5.  Voting List.  The officer who has charge of the stock
ledger of the corporation shall prepare and make, at least ten (10) days before
every meeting of stockholders, a complete list of the stockholders entitled to
vote at the meeting, arranged in alphabetical order, and showing the address of
each stockholder and the number of shares registered in the name of each
stockholder.  Such list shall be open to the examination of any stockholder,
for any purpose germane to the meeting, during ordinary business hours, for a
period of at least ten (10) days prior to the meeting, either at a place within
the city or town where the meeting is to be held, which place shall be
specified


                                       2


<PAGE>   3
in the notice of the meeting, or, if not so specified, at the place where the
meeting is to be held.  The list shall also be produced and kept at the time
and place of the meeting during the whole time thereof, and may be inspected by
any stockholder who is present.


         Section 6.  Quorum.  The holders of a majority of the stock issued and
outstanding and entitled to vote thereat, present in person or represented by
proxy, shall constitute a quorum at all meetings of the stockholders for the
transaction of business, except as otherwise provided by statute, the
certificate of incorporation or these bylaws.

         Section 7.  Adjournments.  Any meeting of stockholders may be
adjourned from time to time to any other time and to any other place at which a
meeting of stockholders may be held under these bylaws, which time and place
shall be announced at the meeting, by a majority of the stockholders present in
person or represented by proxy at the meeting and entitled to vote, though less
than a quorum, or, if no stockholder is present or represented by proxy, by any
officer entitled to preside at or to act as secretary of such meeting, without
notice other than announcement at the meeting, until a quorum shall be present
or represented.  At such reconvened meeting at which a quorum shall be present
or represented, any business may be transacted which might have been transacted
at the original meeting.  If the adjournment is for more than thirty (30) days,
or if after the adjournment a new record date is fixed for the reconvened
meeting, a notice of the reconvened meeting shall be given to each stockholder
of record entitled to vote at the meeting.

         Section 8.  Action at Meetings.  When a quorum is present at any
meeting, the vote of the holders of a majority of the stock present in person
or represented by proxy and entitled to vote on the question shall decide any
question brought before such meeting, unless the question is one upon which by
express provision of law, the certificate of incorporation or these bylaws, a
different vote is required, in which case such express provision shall govern
and control the decision of such question.

         Section 9.  Voting and Proxies.  Unless otherwise provided in the
certificate of incorporation, each stockholder shall at every meeting of the
stockholders be entitled to one vote for each share of capital stock having
voting power held of record by such stockholder.  Each stockholder entitled to
vote at a meeting of stockholders, or to express consent or dissent to
corporate action in writing without a meeting, may authorize another person or
persons to act for such stockholder by proxy; provided that the instrument
authorizing such proxy to act shall have been executed in writing (which shall
include telegraphing, cabling or other means of electronically transmitted
written copy) by the stockholder personally or by the stockholder's duly





                                      -3-


<PAGE>   4
authorized attorney in fact.  No such proxy shall be voted or acted upon after
three years from its date, unless the proxy provides for a longer period.

         Section 10.  Action Without Meeting.  No action required or permitted
to be taken at any annual or special meeting of the stockholders of the
corporation may be taken without a meeting and the power of the stockholders to
consent in writing, without a meeting, to the taking of any action is
specifically denied.


                                   ARTICLE II

                                   DIRECTORS

         Section 1.  Number, Election, Tenure and Qualification.  The number of
directors which shall constitute the whole board shall not be less than three
nor more than eight.  Within such limit, the number of directors shall be
determined by resolution of the Board of Directors or by the stockholders at
the annual meeting or at any special meeting of stockholders.  The directors
shall be elected at the annual meeting or at any special meeting of the
stockholders, except as provided in Section 3 of this Article, and each
director elected shall hold office until such director's successor is elected
and qualified, unless sooner displaced.  Directors need not be stockholders.

         Section 2.  Enlargement.  The number of the Board of Directors may be
increased at any time by vote of a majority of the directors then in office.

         Section 3.  Nominations.  Subject to the rights of holders of any
class or series of stock having a preference over the common stock as to
dividends or upon liquidation, nominations for election to the Board of
Directors of the corporation at a meeting of stockholders may be made on behalf
of the board by the nominating committee appointed by the board, or by any
stockholder of the corporation entitled to vote for the election of directors
at such meeting.  Such nominations, other than those made by the nominating
committee on behalf of the board, shall be made by notice in writing delivered
or mailed by first class United States mail or a nationally recognized courier
service, postage prepaid, to the secretary or assistant secretary of the
corporation, and received by such officer not less than one hundred twenty
(120) days prior to any meeting of stockholders called for the election of
directors; provided, however, that if less than one hundred (100) days' notice
of the meeting is given to stockholders, such nomination shall have been mailed
or delivered to the secretary or the assistant secretary of the corporation not
later than the close of business on the seventh day following the day on which
the notice of meeting was mailed.  Such notice shall set forth as to each
proposed nominee who is not an incumbent director (i) the





                                      -4-


<PAGE>   5
name, age, business address and, if known, residence address of each nominee
proposed in such notice; (ii) the principal occupation or employment of each
such nominee; (iii) the number of shares of stock of the corporation which are
beneficially owned by each such nominee and by the nominating stockholder; and
(iv) any other information concerning the nominee that must be disclosed of
nominees in proxy solicitations regulated by Regulation 14A of the Securities
Exchange Act of 1934, as amended.

         The chairman of the meeting may, if the facts warrant, determine and
declare to the meeting that a nomination was not made in accordance with the
foregoing procedure, and if the chairman should so determine, the chairman
shall so declare the meeting and the defective nomination shall be disregarded.

         Section 4.  Vacancies.  Vacancies and newly created directorships
resulting from any increase in the authorized number of directors may be filled
by a majority of the directors then in office, though less than a quorum, or by
a sole remaining director, and the directors so chosen shall hold office until
the next annual election at which the term of the class to which they have been
elected expires and until their successors are duly elected and shall qualify,
unless sooner displaced.  If there are no directors in office, then an election
of directors may be held in the manner provided by statute.  In the event of a
vacancy in the Board of Directors, the remaining directors, except as otherwise
provided by law or these bylaws, may exercise the powers of the full board
until the vacancy is filled.

         Section 5.  Resignation and Removal.  Any director may resign at any
time upon written notice to the corporation at its principal place of business
or to the chief executive officer or the secretary.  Such resignation shall be
effective upon receipt of such notice unless the notice specifies such
resignation to be effective at some other time or upon the happening of some
other event.  Any director or the entire Board of Directors may be removed, but
only for cause, by the holders of a majority of the shares then entitled to
vote at an election of directors, unless otherwise specified by law or the
certificate of incorporation.

         Section 6.  General Powers.  The business and affairs of the
corporation shall be managed by its Board of Directors, which may exercise all
powers of the corporation and do all such lawful acts and things as are not by
statute or by the certificate of incorporation or by these bylaws directed or
required to be exercised or done by the stockholders.

         Section 7.  Chairman of the Board.  If the Board of Directors appoints
a chairman of the board, such chairman shall, when present, preside at all
meetings of the stockholders and the Board of Directors.  The chairman shall
perform such duties and possess such powers as are customarily vested in the
office





                                      -5-


<PAGE>   6
of the chairman of the board or as may be vested in the chairman by the Board
of Directors.

         Section 8.  Place of Meetings.  The Board of Directors may hold
meetings, both regular and special, either within or without the State of
Delaware.

         Section 9.  Regular Meetings.  Regular meetings of the Board of
Directors may be held without notice at such time and at such place as shall
from time to time be determined by the board; provided that any director who is
absent when such a determination is made shall be given prompt notice of such
determination.  A regular meeting of the Board of Directors may be held without
notice immediately after and at the same place as the annual meeting of
stockholders.

         Section 10.  Special Meetings.  Special meetings of the board may be
called by the chief executive officer, secretary, or on the written request of
two or more directors, or by one director in the event that there is only one
director in office.  Four (4) hours' notice to each director, either personally
or by telegram, cable, telecopy, commercial delivery service, telex or similar
means sent to such director's business or home address, or two (2) days' notice
by written notice deposited in the mail or delivered by a nationally recognized
courier service, shall be given to each director by the secretary or by the
officer or one of the directors calling the meeting.  A notice or waiver of
notice of a meeting of the Board of Directors need not specify the purposes of
the meeting.

         Section 11.  Quorum, Action at Meeting, Adjournments.  At all meetings
of the board, a majority of directors then in office, but in no event less than
one third of the entire board, shall constitute a quorum for the transaction of
business, and the act of a majority of the directors present at any meeting at
which there is a quorum shall be the act of the Board of Directors, except as
may be otherwise specifically provided by law or by the certificate of
incorporation.  For purposes of this section, the term "entire board" shall
mean the number of directors last fixed by the stockholders or directors, as
the case may be, in accordance with law and these bylaws; provided, however,
that if less than all the number so fixed of directors were elected, the
"entire board" shall mean the greatest number of directors so elected to hold
office at any one time pursuant to such authorization.  If a quorum shall not
be present at any meeting of the Board of Directors, a majority of the
directors present thereat may adjourn the meeting from time to time, without
notice other than announcement at the meeting, until a quorum shall be present.

         Section 12.  Action by Consent.  Unless otherwise restricted by the
certificate of incorporation or these bylaws, any action required or permitted
to be taken at any meeting of the Board of Directors or of any committee
thereof may be taken





                                      -6-


<PAGE>   7
without a meeting, if all members of the board or committee, as the case may
be, consent thereto in writing, and the writing or writings are filed with the
minutes of proceedings of the board or committee.

         Section 13.  Telephonic Meetings.  Unless otherwise restricted by the
certificate of incorporation or these bylaws, members of the Board of Directors
or of any committee thereof may participate in a meeting of the Board of
Directors or of any committee, as the case may be, by means of conference
telephone or similar communications equipment by means of which all persons
participating in the meeting can hear each other, and such participation in a
meeting shall constitute presence in person at the meeting.

         Section 14.  Committees.  The Board of Directors may, by resolution
passed by a majority of the whole board, designate one or more committees, each
committee to consist of one or more of the directors of the corporation.  The
board may designate one or more directors as alternate members of any
committee, who may replace any absent or disqualified member at any meeting of
the committee.  Any such committee, to the extent provided in the resolution of
the Board of Directors, shall have and may exercise all the powers and
authority of the Board of Directors in the management of the business and
affairs of the corporation, and may authorize the seal of the corporation to be
affixed to all papers which may require it; but no such committee shall have
the power or authority in reference to amending the certificate of
incorporation, adopting an agreement of merger or consolidation, recommending
to the stockholders the sale, lease or exchange of all or substantially all of
the corporation's property and assets, recommending to the stockholders a
dissolution of the corporation or a revocation of a dissolution, or amending
the bylaws of the corporation; and, unless the resolution designating such
committee or the certificate of incorporation expressly so provide, no such
committee shall have the power or authority to declare a dividend or to
authorize the issuance of stock.  Such committee or committees shall have such
name or names as may be determined from time to time by resolution adopted by
the Board of Directors.  Each committee shall keep regular minutes of its
meetings and make such reports to the Board of Directors as the Board of
Directors may request.  Except as the Board of Directors may otherwise
determine, any committee may make rules for the conduct of its business, but
unless otherwise provided by the directors or in such rules, its business shall
be conducted as nearly as possible in the same manner as is provided in these
bylaws for the conduct of its business by the Board of Directors.

         Section 15.  Compensation.  Unless otherwise restricted by the
certificate of incorporation or these bylaws, the Board of Directors shall have
the authority to fix from time to time the compensation of directors.  The
directors may be paid their expenses, if any, of attendance at each meeting of
the Board of





                                      -7-


<PAGE>   8
Directors and the performance of their responsibilities as directors and may be
paid a fixed sum for attendance at each meeting of the Board of Directors
and/or a stated salary as director.  No such payment shall preclude any
director from serving the corporation or its parent or subsidiary corporations
in any other capacity and receiving compensation therefor.  The Board of
Directors may also allow compensation for members of special or standing
committees for service on such committees.

                                  ARTICLE III

                                    OFFICERS

         Section 1.  Enumeration.  The officers of the corporation shall be
chosen by the Board of Directors and shall be a president, a secretary and a
chief financial officer and such other officers with such titles, terms of
office and duties as the Board of Directors may from time to time determine,
including one or more vice-presidents, and one or more assistant secretaries
and assistant financial officers.  If authorized by resolution of the Board of
Directors, the chief executive officer may be empowered to appoint from time to
time assistant secretaries and assistant financial officers.  Any number of
offices may be held by the same person, unless the certificate of incorporation
or these bylaws otherwise provide.

         Section 2.  Election.  The Board of Directors at its first meeting
after each annual meeting of stockholders shall choose a president, a secretary
and a chief financial officer.  Other officers may be appointed by the Board of
Directors at such meeting, at any other meeting, or by written consent.

         Section 3.  Tenure.  The officers of the corporation shall hold office
until their successors are chosen and qualify, unless a different term is
specified in the vote choosing or appointing such officer, or until such
officer's earlier death, resignation or removal.  Any officer elected or
appointed by the Board of Directors or by the chief executive officer may be
removed at any time by the affirmative vote of a majority of the Board of
Directors or a committee duly authorized to do so, except that any officer
appointed by the chief executive officer may also be removed at any time by the
chief executive officer.  Any vacancy occurring in any office of the
corporation may be filled by the Board of Directors, at its discretion.  Any
officer may resign by delivering such officer's written resignation to the
corporation at its principal place of business or to the chief executive
officer or the secretary.  Such resignation shall be effective upon receipt
unless it is specified to be effective at some other time or upon the happening
of some other event.

         Section 4.  President.  The president shall be the chief operating
officer of the corporation.  The president shall also be the chief executive
officer unless the Board of Directors





                                      -8-


<PAGE>   9
otherwise provides.  The president shall, unless the Board of Directors
provides otherwise in a specific instance or generally, preside at all meetings
of the stockholders and the Board of Directors, have general and active
management of the business of the corporation and see that all orders and
resolutions of the Board of Directors are carried into effect.  The president
shall execute bonds, mortgages, and other contracts requiring a seal, under the
seal of the corporation, except where required or permitted by law to be
otherwise signed and executed and except where the signing and execution
thereof shall be expressly delegated by the Board of Directors to some other
officer or agent of the corporation.

         Section 5.  Vice-Presidents.  In the absence of the president or in
the event of the president's inability or refusal to act, the vice-president,
or if there be more than one vice-president, the vice-presidents in the order
designated by the Board of Directors or the chief executive officer (or in the
absence of any designation, then in the order determined by their tenure in
office) shall perform the duties of the president, and when so acting, shall
have all the powers of and be subject to all the restrictions upon the
president.  The vice-presidents shall perform such other duties and have such
other powers as the Board of Directors or the chief executive officer may from
time to time prescribe.

         Section 6.  Secretary.  The secretary shall have such powers and
perform such duties as are incident to the office of secretary.  The secretary
shall maintain a stock ledger and prepare lists of stockholders and their
addresses as required and shall be the custodian of corporate records.  The
secretary shall attend all meetings of the Board of Directors and all meetings
of the stockholders and record all the proceedings of the meetings of the
corporation and of the Board of Directors in a book to be kept for that purpose
and shall perform like duties for the standing committees when required.  The
secretary shall give, or cause to be given, notice of all meetings of the
stockholders and special meetings of the Board of Directors, and shall perform
such other duties as may be from time to time prescribed by the Board of
Directors or chief executive officer, under whose supervision the secretary
shall be.  The secretary shall have custody of the corporate seal of the
corporation and the secretary, or an assistant secretary, shall have authority
to affix the same to any instrument requiring it and when so affixed, it may be
attested by the secretary's signature or by the signature of such assistant
secretary.  The Board of Directors may give general authority to any other
officer to affix the seal of the corporation and to attest the affixing by such
officer's signature.

         Section 7.  Assistant Secretaries.  The assistant secretary, or if
there be more than one, the assistant secretaries in the order determined by
the Board of Directors, the chief executive officer or the secretary (or if
there be no such determina-





                                      -9-


<PAGE>   10
tion, then in the order determined by their tenure in office), shall, in the
absence of the secretary or in the event of the secretary's inability or
refusal to act, perform the duties and exercise the powers of the secretary and
shall perform such other duties and have such other powers as the Board of
Directors, the chief executive officer or the secretary may from time to time
prescribe.  In the absence of the secretary or any assistant secretary at any
meeting of stockholders or directors, the person presiding at the meeting shall
designate a temporary or acting secretary to keep a record of the meeting.

         Section 8.  Chief Financial Officer.  The chief financial officer
shall perform such duties and shall have such powers as may be assigned to such
officer by the Board of Directors or the chief executive officer.  The chief
financial officer shall also be the treasurer unless the Board of Directors
otherwise provides.  In addition, the chief financial officer shall perform
such duties and have such powers as are incident to the office of chief
financial officer.  The chief financial officer shall have the custody of the
corporate funds and securities and shall keep full and accurate accounts of
receipts and disbursements in books belonging to the corporation and shall
deposit all moneys and other valuable effects in the name and to the credit of
the corporation in such depositories as may be designated by the Board of
Directors.  The chief financial officer shall disburse the funds of the
corporation as may be ordered by the Board of Directors, taking proper vouchers
for such disbursements, and shall render to the chief executive officer and the
Board of Directors, when the chief executive officer or Board of Directors so
requires, an account of all such officer's transactions as chief financial
officer and of the financial condition of the corporation.

         Section 9.  Assistant Financial Officers.  The assistant financial
officer, or if there shall be more than one, the assistant financial officers
in the order determined by the Board of Directors, the chief executive officer
or the chief financial officer (or if there be no such determination, then in
the order determined by their tenure in office), shall, in the absence of the
chief financial officer or in the event of the chief financial officer's
inability or refusal to act, perform the duties and exercise the powers of the
chief financial officer and shall perform such other duties and have such other
powers as the Board of Directors, the chief executive officer or the chief
financial officer may from time to time prescribe.

         Section 10.  Bond.  If required by the Board of Directors, any officer
shall give the corporation a bond in such sum and with such surety or sureties
and upon such terms and conditions as shall be satisfactory to the Board of
Directors, including without limitation a bond for the faithful performance of
the duties of such officer's office and for the restoration to the corporation
of all books, papers, vouchers, money and other





                                      -10-


<PAGE>   11
property of whatever kind in such officer's possession or under such officer's
control and belonging to the corporation.

         Section 11.  Delegation of Authority.  The Board of Directors may from
time to time delegate the powers or duties of any officer to any other officers
or agents, notwithstanding any provision hereof.

                                   ARTICLE IV

                                    NOTICES

         Section 1.  Delivery.  Whenever, under the provisions of law, or of
the certificate of incorporation or these bylaws, written notice is required to
be given to any director or stockholder, such notice may be given by mail,
addressed to such director or stockholder, at such person's address as it
appears on the records of the corporation, with postage thereon prepaid, and
such notice shall be deemed to be given at the time when the same shall be
deposited in the United States mail or delivered to a nationally recognized
courier service.  Unless written notice by mail is required by law, written
notice may also be given by telegram, cable, facsimile, commercial delivery
service, telex or similar means, addressed to such director or stockholder at
such person's address as it appears on the records of the corporation, in which
case such notice shall be deemed to be given when delivered into the control of
the persons charged with effecting such transmission, the transmission charge
to be paid by the corporation or the person sending such notice and not by the
addressee.  Oral notice or other in-hand delivery (in person or by telephone)
shall be deemed given at the time it is actually given.

         Section 2.  Waiver of Notice.  Whenever any notice is required to be
given under the provisions of law or of the certificate of incorporation or of
these bylaws, a waiver thereof in writing, signed by the person or persons
entitled to said notice, whether before or after the time stated therein, shall
be deemed equivalent thereto.

                                   ARTICLE V

                                INDEMNIFICATION

         Section 1.  Actions Other than by or in the Right of the Corporation.
The corporation shall indemnify any person who was or is a party or is
threatened to be made a party to any threatened, pending or completed action,
suit or proceeding, whether civil, criminal, administrative or investigative
(other than an action by or in the right of the corporation) by reason of the
fact that such person is or was a director, officer, employee or agent of the
corporation, or is or was serving at the request of the corporation as a
director, officer, employee or agent of another corporation, partnership, joint
venture, trust or other





                                      -11-


<PAGE>   12
enterprise, against expenses (including attorneys fees), judgments, fines and
amounts paid in settlement actually and reasonably incurred by such person in
connection with such action, suit or proceeding if such person acted in good
faith and in a manner such person reasonably believed to be in or not opposed
to the best interests of the corporation, and, with respect to any criminal
action or proceedings, had no reasonable cause to believe such person's conduct
was unlawful.  The termination of any action, suit or proceeding by judgment,
order, settlement, conviction, or upon a plea of nolo contendere or its
equivalent, shall not, of itself, create a presumption that the person did not
act in good faith and in a manner which such person reasonably believed to be
in or not opposed to the best interests of the corporation, and, with respect
to any criminal action or proceeding, had reasonable cause to believe that such
person's conduct was unlawful.

         Section 2.  Actions by or in the Right of the Corporation.  The
corporation shall indemnify any person who was or is a party or is threatened
to be made a party to any threatened, pending or completed action or suit by or
in the right of the corporation to procure a judgment in its favor by reason of
the fact that such person is or was a director, officer, employee or agent of
the corporation, or is or was serving at the request of the corporation as a
director, officer, employee or agent of another corporation, partnership, joint
venture, trust or other enterprise against expenses (including attorneys fees)
actually and reasonably incurred by such person in connection with the defense
or settlement of such action or suit if such person acted in good faith and in
a manner such person reasonably believed to be in or not opposed to the best
interests of the corporation and except that no indemnification shall be made
in respect of any claim, issue or matter as to which such person shall have
been adjudged to be liable for negligence or misconduct in the performance of
such person's duty to the corporation unless and only to the extent that the
Court of Chancery of the State of Delaware or the court in which such action or
suit was brought shall determine upon application that, despite the
adjudication of liability but in view of all the circumstances of the case,
such person is fairly and reasonably entitled to indemnity for such expenses
which the Court of Chancery of the State of Delaware or such other court shall
deem proper.

         Section 3.  Success on the Merits.  To the extent that any person
described in Section 1 or 2 of this Article V has been successful on the merits
or otherwise in defense of any action, suit or proceeding referred to in said
Sections, or in defense of any claim, issue or matter therein, such person
shall be indemnified against expenses (including attorneys' fees) actually and
reasonably incurred by such person in connection therewith.





                                      -12-


<PAGE>   13
         Section 4.  Specific Authorization.  Any indemnification under Section
1 or 2 of this Article V (unless ordered by a court) shall be made by the
corporation only as authorized in the specific case upon a determination that
indemnification of any person described in said Sections is proper in the
circumstances because such person has met the applicable standard of conduct
set forth in said Sections.  Such determination shall be made (i) by the Board
of Directors by a majority vote of a quorum consisting of directors who were
not parties to such action, suit or proceeding; or (ii) if such a quorum is not
obtainable, or even if obtainable a quorum of disinterested directors so
directs, by independent legal counsel in a written opinion; or (iii) by the
stockholders of the corporation.

         Section 5.  Advance Payment.  Expenses incurred in defending a civil
or criminal action, suit or proceeding may be paid by the corporation in
advance of the final disposition of such action, suit or proceeding as
authorized by the Board of Directors in the manner provided for in Section 4 of
this Article V upon receipt of an undertaking by or on behalf of any person
described in said Section to repay such amount unless it shall ultimately be
determined that such person is entitled to indemnification by the corporation
as authorized in this Article V.

         Section 6.  Non-Exclusivity.  The indemnification provided by this
Article V shall not be deemed exclusive of any other rights to which those
indemnified may be entitled under any bylaw, agreement, vote of stockholders or
disinterested directors or otherwise, both as to action in such person's
official capacity and as to action in another capacity while holding such
office, and shall continue as to a person who has ceased to be director,
officer, employee or agent of the corporation and shall inure to the benefit of
the heirs, executors and administrators of such a person.

         Section 7.  Insurance.  The Board of Directors may authorize, by a
vote of the majority of the full board, the corporation to purchase and
maintain insurance on behalf of any person who is or was a director, officer,
employee or agent of the corporation, or is or was serving at the request of
the corporation as a director, officer, employee or agent of another
corporation, partnership, joint venture, trust or other enterprise against any
liability asserted against such person and incurred by such person in any such
capacity, or arising out of such person's status as such, whether or not the
corporation would have the power to indemnify such person against such
liability under the provisions of this Article V.

         Section 8.  Severability.  If any word, clause or provision of this
Article V or any award made hereunder shall for any reason be determined to be
invalid, the provisions hereof shall not otherwise be affected thereby but
shall remain in full force and effect.





                                      -13-


<PAGE>   14
         Section 9.  Intent of Article.  The intent of this Article V is to
provide for indemnification to the fullest extent permitted by section 145 of
the General Corporation Law of Delaware.  To the extent that such Section or
any successor section may be amended or supplemented from time to time, this
Article V shall be amended automatically and construed so as to permit
indemnification to the fullest extent from time to time permitted by law.

                                   ARTICLE VI

                                 CAPITAL STOCK

         Section 1.  Certificates of Stock.  Every holder of stock in the
corporation shall be entitled to have a certificate, signed by, or in the name
of the corporation by, the chairman or vice-chairman of the Board of Directors,
or the president or a vice-president and the chief financial officer or an
assistant financial officer, or the secretary or an assistant secretary of the
corporation, certifying the number of shares owned by such stockholder in the
corporation.  Any or all of the signatures on the certificate may be a
facsimile.  In case any officer, transfer agent or registrar who has signed or
whose facsimile signature has been placed upon a certificate shall have ceased
to be such officer, transfer agent or registrar before such certificate is
issued, it may be issued by the corporation with the same effect as if such
person were such officer, transfer agent or registrar at the date of issue.
Certificates may be issued for partly paid shares and in such case upon the
face or back of the certificates issued to represent any such partly paid
shares, the total amount of the consideration to be paid therefor, and the
amount paid thereon shall be specified.

         Section 2.  Lost Certificates.  The Board of Directors may direct a
new certificate or certificates to be issued in place of any certificate or
certificates theretofore issued by the corporation alleged to have been lost,
stolen or destroyed.  When authorizing such issue of a new certificate or
certificates, the Board of Directors may, in its discretion and as a condition
precedent to the issuance thereof, require the owner of such lost, stolen or
destroyed certificate or certificates, or such owner's legal representative, to
give reasonable evidence of such loss, theft or destruction, to advertise the
same in such manner as it shall require and/or to give the corporation a bond
in such sum as it may direct as indemnity against any claim that may be made
against the corporation with respect to the certificate alleged to have been
lost, stolen or destroyed or the issuance of such new certificate.

         Section 3.  Transfer of Stock.  Upon surrender to the corporation or
the transfer agent of the corporation of a certificate for shares, duly
endorsed or accompanied by proper evidence of succession, assignment or
authority to transfer, and proper evidence of compliance with other conditions
to rightful





                                      -14-


<PAGE>   15
transfer, it shall be the duty of the corporation to issue a new certificate to
the person entitled thereto, cancel the old certificate and record the
transaction upon its books.

         Section 4.  Record Date for Action at a Meeting or for Other Purposes.
In order that the corporation may determine the stockholders entitled to notice
of or to vote at any meeting of stockholders or any adjournment thereof, or
entitled to receive payment of any dividend or other distribution or allotment
of any rights, or entitled to exercise any rights in respect of any change,
conversion or exchange of stock or for the purpose of any other lawful action,
the Board of Directors may fix, in advance, a record date, which shall not be
more than sixty (60) days nor less than ten (10) days before the date of such
meeting, nor more than sixty (60) days prior to any other action to which such
record date relates.  A determination of stockholders of record entitled to
notice of or to vote at a meeting of stockholders shall apply to any
adjournment of the meeting; provided, however, that the Board of Directors may
fix a new record date for the adjourned meeting.  If no record date is fixed,
the record date for determining stockholders entitled to notice of or to vote
at a meeting of stockholders shall be at the close of business on the day
before the day on which notice is given, or, if notice is waived, at the close
of business on the day before the day on which the meeting is held.  The record
date for determining stockholders for any other purpose within this Section 4
shall be at the close of business on the day on which the Board of Directors
adopts the resolution relating to such purpose.

         Section 5.  Registered Stockholders.  The corporation shall be
entitled to recognize the exclusive right of a person registered on its books
as the owner of shares to receive dividends, and to vote as such owner, and to
hold liable for calls and assessments a person registered on its books as the
owner of shares, and shall not be bound to recognize any equitable or other
claim to or interest in such share or shares on the part of any other person,
whether or not it shall have express or other notice thereof, except as
otherwise provided by the laws of Delaware.

                                  ARTICLE VII

                              CERTAIN TRANSACTIONS

         Section 1.  Transactions with Interested Parties.  No contract or
transaction between the corporation and one or more of its directors or
officers, or between the corporation and any other corporation, partnership,
association or other organization in which one or more of its directors or
officers are directors or have a financial interest, shall be void or voidable
solely for this reason, or solely because the director or officer is present at
or participates in the meeting of the board or committee thereof which
authorizes the contract or





                                      -15-


<PAGE>   16
transaction or solely because the vote or votes of such director or officer are
counted for such purpose, if:

         (a) the material facts as to such person's relationship or interest
and as to the contract or transaction are disclosed or are known to the Board
of Directors or the committee, and the board or committee in good faith
authorizes the contract or transaction by the affirmative votes of a majority
of the disinterested directors, even though the disinterested directors be less
than a quorum; or

         (b) the material facts as to such person's relationship or interest
and as to the contract or transaction are disclosed or are known to the
stockholders entitled to vote thereon, and the contract or transaction is
specifically approved in good faith by vote of the stockholders; or

         (c) the contract or transaction is fair as to the corporation as of
the time it is authorized, approved or ratified, by the Board of Directors, a
committee thereof, or the stockholders.

         Section 2.  Quorum.  Common or interested directors may be counted in
determining the presence of a quorum at a meeting of the Board of Directors or
of a committee which authorizes the contract or transaction.

                                  ARTICLE VIII

                               GENERAL PROVISIONS

         Section 1.  Dividends.  Dividends upon the capital stock of the
corporation, if any, may be declared by the Board of Directors at any regular
or special meeting or by written consent, pursuant to law.  Dividends may be
paid in cash, in property, or in shares of the capital stock, subject to the
provisions of the certificate of incorporation.

         Section 2.  Reserves.  The directors may set apart out of any funds of
the corporation available for dividends a reserve or reserves for any proper
purpose and may abolish any such reserve.

         Section 3.  Checks.  All checks or demands for money and notes of the
corporation shall be signed by such officer or officers or such other person or
persons as the Board of Directors may from time to time designate.

         Section 4.  Fiscal Year.  The fiscal year of the corporation shall be
fixed by resolution of the Board of Directors.

         Section 5.  Seal.  The Board of Directors may, by resolution, adopt a
corporate seal.  The corporate seal shall have inscribed thereon the name of
the corporation, the year of its





                                      -16-


<PAGE>   17
organization and the word "Delaware."  The seal may be used by causing it or a
facsimile thereof to be impressed or affixed or otherwise reproduced.  The seal
may be altered from time to time by the Board of Directors.

                                   ARTICLE IX

                                   AMENDMENTS

         The Board of Directors is expressly empowered to adopt, amend or
repeal these bylaws, provided, however, that any adoption, amendment or repeal
of these bylaws by the Board of Directors shall require the approval of at
least sixty-six and two-thirds percent (66 2/3%) of the total number of
authorized directors (whether or not there exist any vacancies in previously
authorized directorships at the time any resolution providing for adoption,
amendment or repeal is presented to the board).  The stockholders shall also
have power to adopt, amend or repeal these bylaws, provided, however, that in
addition to any vote of the holders of any class or series of stock of this
corporation required by law or by the certificate of incorporation of this
corporation, the affirmative vote of the holders of at least sixty-six and two-
thirds percent (66 2/3%) of the voting power of all of the then outstanding
shares of the stock of the corporation entitled to vote generally in the
election of directors, voting together as a single class, shall be required for
such adoption, amendment or repeal by the stockholders of any provisions of
these bylaws.





                                      -17-


<PAGE>   18

                            CERTIFICATE OF SECRETARY


         I hereby certify:

         1.  That I am the duly elected and acting Secretary of Biosite
             Diagnostics Incorporated, a Delaware corporation; and

         2.  That the foregoing bylaws, comprising 17 pages, constitute the
amended and restated bylaws of such corporation as duly adopted by directors of
the corporation at a duly held meeting of the Board of Directors on December
__, 1996, subject to the corporation consummating an initial public offering of
its Common Stock, such offering having been consummated on ______ __, 1997,
became effective as of that date.


         IN WITNESS WHEREOF, I have hereunder subscribed my name this _____ day
of __________, 1997.



                                       --------------------------------
                                              Kim D. Blickenstaff
                                                    Secretary






                                      -18-



<PAGE>   1
                                                                   Exhibit 5.1

                         PILLSBURY MADISON & SUTRO LLP
                                 P.O. BOX 7880
                            SAN FRANCISCO, CA 94120
                              Tel: (415) 983-1000
                              Fax: (415) 983-1200



                                                     December 11, 1996


Biosite Diagnostics Incorporated
11030 Roselle Street
San Diego, California 92121

         Re:      Registration Statement on Form S-1


Ladies and Gentlemen:

         We are acting as counsel for Biosite Diagnostics Incorporated, a
Delaware corporation (the "Company"), in connection with the registration under
the Securities Act of 1933, as amended, of 2,300,000 shares of Common Stock, par
value $.01 per share (the "Common Stock"), of the Company (including 300,000
shares subject to the underwriters' over-allotment option) to be offered and
sold by the Company. In this regard we have participated in the preparation of a
Registration Statement on Form S-1 relating to such 2,300,000 shares of Common
Stock. (Such Registration Statement, as amended, and including any registration
statement related thereto and filed pursuant to Rule 462(b) under the Securities
Act (a "Rule 462(b) registration statement") is herein referred to as the
"Registration Statement.")

         We are of the opinion that the shares of Common Stock to be offered and
sold by the Company (including any shares of Common Stock registered pursuant to
a Rule 462(b) registration statement) have been duly authorized and, when issued
and sold by the Company in the manner described in the Registration Statement
and in accordance with the resolutions adopted by the Board of Directors of the
Company, will be legally issued, fully paid and nonassessable.

         We hereby consent to the filing of this opinion as Exhibit 5.1 to the
Registration Statement and to the use of our name under the caption "Legal
Matters" in the Registration Statement and in the Prospectus included therein.

                                             Very truly yours,

                                             /s/ Pillsbury Madison & Sutro LLP

<PAGE>   1





                                                                    Exhibit 10.1




                              AMENDED AND RESTATED

                               1989 STOCK PLAN OF

                        BIOSITE DIAGNOSTICS INCORPORATED

          AS ADOPTED ON JULY 20, 1989, AND AMENDED ON MAY 17, 1996


SECTION 1.  ESTABLISHMENT AND PURPOSE.

                 The Plan was established in 1989 to offer selected employees,
directors, advisers and consultants an opportunity to acquire a proprietary
interest in the success of the Company, or to increase such interest, by
purchasing Shares of the Company's Common Stock.  The Plan was adopted by the
Board of Directors on July 20, 1989.  The Plan was amended and restated by the
Board of Directors on April 24, 1990, on January 17, 1991, on October 24, 1991
on November 5, 1992, January 14, 1993, April 19, 1995 and May 17, 1996.  The
Plan provides both for the direct award or sale of Shares and for the grant of
Options to purchase Shares.  Options granted under the Plan may include
Nonstatutory Options as well as ISOs intended to qualify under section 422 of
the Code.

SECTION 2.  DEFINITIONS.

                 (a)     "Board of Directors" shall mean the Board of
Directors of the Company, as constituted from time to time.

                 (b)     "Code" shall mean the Internal Revenue Code of 1986,
as amended.

                 (c)     "Committee" shall mean a committee of the Board of
Directors, as described in Section 3(a).
<PAGE>   2
                 (d)      "Company" shall mean Biosite Diagnostics
Incorporated, a Delaware corporation.

                 (e)      "Employee" shall mean (i) any individual who is a
common-law employee of the Company or of a Subsidiary, (ii) a member of the
Board of Directors and (iii) an independent contractor who performs services
for the Company or a Subsidiary.  Service as a member of the Board of Directors
or as an independent contractor shall be considered employment for all purposes
of the Plan except the second sentence of Section 4(a).

                 (f)      "Exercise Price" shall mean the amount for which one
Share may be purchased upon exercise of an Option, as specified by the
Committee in the applicable Stock Option Agreement.

                 (g)      "Fair Market Value" shall mean the fair market value
of a Share, as determined by the Committee in good faith.  Such determination
shall be conclusive and binding on all persons.

                 (h)      "ISO" shall mean an employee incentive stock option
described in section 422(b) of the Code.

                 (i)      "Nonstatutory Option" shall mean an employee stock
option not described in section 422 or 423(b) of the Code.

                 (j)      "Offeree" shall mean an individual to whom the
Committee has offered the right to acquire Shares under the Plan (other than
upon exercise of an Option).


                                      -2-




<PAGE>   3
                 (k)      "Option" shall mean an ISO or Nonstatutory Option
granted under the Plan and entitling the holder to purchase Shares.

                 (l)      "Optionee" shall mean an individual who holds an
Option.

                 (m)      "Plan" shall mean this 1989 Stock Plan of Biosite
Diagnostics Incorporated.

                 (n)      "Purchase Price" shall mean the consideration for
which one Share may be acquired under the Plan (other than upon exercise of an
Option), as specified by the Committee.

                 (o)      "Service" shall mean service as an Employee.

                 (p)      "Share" shall mean one share of Stock, as adjusted in
accordance with Section 9 (if applicable).

                 (q)      "Stock" shall mean the Common Stock of the Company.

                 (r)      "Stock Option Agreement" shall mean the agreement
between the Company and an Optionee which contains the terms, conditions and
restrictions pertaining to his Option.

                 (s)      "Stock Purchase Agreement" shall mean the agreement
between the Company and an Offeree who acquires Shares under the Plan which
contains the terms, conditions and restrictions pertaining to the acquisition
of such Shares.

                 (t)      "Subsidiary" shall mean any corporation, if the
Company and/or one or more other Subsidiaries own not





                                      -3-




<PAGE>   4
less than 50 percent of the total combined voting power of all classes of
outstanding stock of such corporation.  A corporation that attains the status
of a Subsidiary on a date after the adoption of the Plan shall be considered a
Subsidiary commencing as of such date.

                 (u)      "Total and Permanent Disability" shall mean that the
Optionee is unable to engage in any substantial gainful activity by reason of
any medically determinable physical or mental impairment which can be expected
to result in death or which has lasted, or can be expected to last, for a
continuous period of not less than one year.



SECTION 3.  ADMINISTRATION.

                 (a)      Committee Membership.  The Plan shall be administered
by the Committee, which shall consist of members of the Board of Directors.
The members of the Committee shall be appointed by the Board of Directors.  If
no Committee has been appointed, the entire Board of Directors shall constitute
the Committee.

                 (b)      Committee Procedures.  The Board of Directors shall
designate one of the members of the Committee as chairman.  The Committee may
hold meetings at such times and places as it shall determine.  The acts of a
majority of the Committee members present at meetings at which a quorum exists,
or acts reduced to or approved in writing by all Committee members, shall be
valid acts of the Committee.





                                      -4-




<PAGE>   5
                 (c)      Committee Responsibilities.  Subject to the
provisions of the Plan, the Committee shall have full authority and discretion
to take the following actions:

                 (i)  To interpret the Plan and to apply its provisions;

                 (ii)  To adopt, amend or rescind rules, procedures and forms
         relating to the Plan;

                 (iii)  To authorize any person to execute, on behalf of the
         Company, any instrument required to carry out the purposes of the
         Plan;

                 (iv)  To determine when Shares are to be awarded or offered
         for sale and when Options are to be granted under the Plan;

                 (v)  To select the Offerees and Optionees;

                 (vi)  To determine the number of Shares to be offered to each
         Offeree or to be made subject to each Option;

                 (vii)  To prescribe the terms and conditions of each award or
         sale of Shares, including (without limitation) the Purchase Price, and
         to specify the provisions of the Stock Purchase Agreement relating to
         such award or sale;

                 (viii)  To prescribe the terms and conditions of each Option,
         including (without limitation) the Exercise Price, to determine
         whether such Option is to be classified as an ISO or as a Nonstatutory





                                      -5-




<PAGE>   6
         Option, and to specify the provisions of the Stock Option Agreement
         relating to such Option;

                 (ix)  To amend any outstanding Stock Purchase Agreement or
         Stock Option Agreement, subject to applicable legal restrictions and
         to the consent of the Offeree or Optionee who entered into such
         agreement;

                 (x)  To prescribe the consideration for the grant of each
         Option or other right under the Plan and to determine the sufficiency
         of such consideration; and

                 (xi)  To take any other actions deemed necessary or advisable
         for the administration of the Plan.

All decisions, interpretations and other actions of the Committee shall be
final and binding on all Offerees, all Optionees, and all persons deriving
their rights from an Offeree or Optionee.  No member of the Committee shall be
liable for any action that he has taken or has failed to take in good faith
with respect to the Plan, any Option, or any right to acquire Shares under the
Plan.

                 (d)      Financial Reports.  Not less often than annually, the
Company shall furnish to Optionees and Offerees reports of its financial
condition, unless such Optionees and Offerees have access to equivalent
information through their employment.  Such reports need not be audited.





                                      -6-




<PAGE>   7
SECTION 4.  ELIGIBILITY.

                 (a)      General Rule.  Only Employees shall be eligible for
designation as Optionees or Offerees by the Committee.  In addition, only
individuals who are employed as common-law employees by the Company or a
Subsidiary shall be eligible for the grant of ISOs.

                 (b)      Ten-Percent Stockholders.  An Employee who owns more
than 10 percent of the total combined voting power of all classes of
outstanding stock of the Company or any of its Subsidiaries shall not be
eligible for designation as an Optionee or Offeree unless (i) the Exercise
Price or Purchase Price (if any) is at least 110 percent of the Fair Market
Value of a Share on the date of grant and (ii) in the case of an ISO, such ISO
by its terms is not exercisable after the expiration of five years from the
date of grant.

                 (c)      Attribution Rules.  For purposes of Subsection (b)
above, in determining stock ownership, an Employee shall be deemed to own the
stock owned, directly or indirectly, by or for his brothers, sisters, spouse,
ancestors and lineal descendants.  Stock owned, directly or indirectly, by or
for a corporation, partnership, estate or trust shall be deemed to be owned
proportionately by or for its shareholders, partners or beneficiaries.  Stock
with respect to which such Employee holds an option shall not be counted.

                 (d)      Outstanding Stock.  For purposes of Subsection (b)
above, "outstanding stock" shall include all stock actually issued and
outstanding immediately after the grant.





                                      -7-




<PAGE>   8
"Outstanding stock" shall not include shares authorized for issuance under
outstanding options held by the Employee or by any other person.



SECTION 5.  STOCK SUBJECT TO PLAN.

                 (a)      Basic Limitation.  Shares offered under the Plan
shall be authorized but unissued Shares or treasury Shares.  The aggregate
number of Shares which may be issued under the Plan (upon exercise of Options
or other rights to acquire Shares) shall not exceed 1,692,000 Shares, subject
to adjustment pursuant to Section 9 and Section 12(a).  The number of Shares
which are subject to Options or other rights outstanding at any time under the
Plan shall not exceed the number of Shares which then remain available for
issuance under the Plan.  The Company, during the term of the Plan, shall at
all times reserve and keep available sufficient Shares to satisfy the
requirements of the Plan.

                (b)      Additional Shares.  In the event that any outstanding
Option or other right for any reason expires or is canceled or otherwise
terminated, the Shares allocable to the unexercised portion of such Option or
other right shall again be available for the purposes of the Plan, or on or
after the date of the Company's initial public offering, shall again be
available for purposes of the 1996 Stock Option Plan of Biosite Diagnostics
Incorporated.  In the event that Shares issued under the Plan are reacquired by
the Company pursuant to a forfeiture provision, a right of repurchase or a right
of first offer, such Shares shall again be available for the purposes of the
Plan, on or after the date of the Company's initial public offering, shall 
again be available for purposes of the 1996 Stock Option Plan of Biosite 
Diagnostics Incorporated.





                                      -8-




<PAGE>   9
SECTION 6.  TERMS AND CONDITIONS OF AWARDS OR SALES.

                 (a)      Stock Purchase Agreement.  Each award or sale of
Shares under the Plan (other than upon exercise of an Option) shall be
evidenced by a Stock Purchase Agreement between the Offeree and the Company.
Such award or sale shall be subject to all applicable terms and conditions of
the Plan and may be subject to any other terms and conditions which are not
inconsistent with the Plan and which the Committee deems appropriate for
inclusion in a Stock Purchase Agreement.  The provisions of the various Stock
Purchase Agreements entered into under the Plan need not be identical.

                 (b)      Duration of Offers and Nontransferability of Rights.
Any right to acquire Shares under the Plan (other than an Option) shall
automatically expire if not exercised by the Offeree within 30 days after the
grant of such right was communicated to him by the Committee.  Such right shall
not be transferable and shall be exercisable only by the Offeree to whom such
right was granted.

                 (c)      Purchase Price.  The Purchase Price of Shares to be
offered under the Plan shall not be less than 85 percent of the Fair Market
Value of such Shares, except as otherwise provided in Section 4(b).  Subject to
the preceding sentence, the Purchase Price shall be determined by the Committee
at its sole discretion.  The Purchase Price shall be payable in a form
described in Section 8.





                                      -9-




<PAGE>   10
                 (d)      Withholding Taxes.  As a condition to the purchase of
Shares, the Offeree shall make such arrangements as the Committee may require
for the satisfaction of any federal, state or local withholding tax obligations
that may arise in connection with such purchase.

                 (e)      Restrictions on Transfer of Shares.  Any Shares
awarded or sold under the Plan shall be subject to such special forfeiture
conditions, rights of repurchase, rights of first offer and other transfer
restrictions as the Committee may determine.  Such restrictions shall be set
forth in the applicable Stock Purchase Agreement and shall apply in addition to
any general restrictions that may apply to all holders of Shares.  Any
service-based vesting conditions shall not be less rapid than the schedule set
forth in Section 7(e).



SECTION 7.  TERMS AND CONDITIONS OF OPTIONS.

                 (a)      Stock Option Agreement.  Each grant of an Option
under the Plan shall be evidenced by a Stock Option Agreement between the
Optionee and the Company.  Such Option shall be subject to all applicable terms
and conditions of the Plan and may be subject to any other terms and conditions
which are not inconsistent with the Plan and which the Committee deems
appropriate for inclusion in a Stock Option Agreement.  The provisions of the
various Stock Option Agreements entered into under the Plan need not be
identical.





                                      -10-




<PAGE>   11
                 (b)      Number of Shares.  Each Stock Option Agreement shall
specify the number of Shares that are subject to the Option and shall provide
for the adjustment of such number in accordance with Section 9.  The Stock
Option Agreement shall also specify whether the Option is an ISO or a
Nonstatutory Option.

                 (c)      Exercise Price.  Each Stock Option Agreement shall
specify the Exercise Price.  The Exercise Price of an ISO shall not be less
than 100 percent of the Fair Market Value of a Share on the date of grant,
except as otherwise provided in Section 4(b).  The Exercise Price of a
Nonstatutory Option shall not be less than 85 percent of the Fair Market Value
of a Share on the date of grant, except as otherwise provided in Section 4(b).
Subject to the preceding two sentences, the Exercise Price under any Option
shall be determined by the Committee at its sole discretion.  The Exercise
Price shall be payable in a form described in Section 8.

                 (d)      Withholding Taxes.  As a condition to the exercise of
an Option, the Optionee shall make such arrangements as the Committee may
require for the satisfaction of any federal, state or local withholding tax
obligations that may arise in connection with such exercise.  The Optionee
shall also make such arrangements as the Committee may require for the
satisfaction of any federal, state or local withholding tax obligations that
may arise in connection





                                      -11-




<PAGE>   12
with the disposition of Shares acquired by exercising an Option.

                 (e)      Exercisability and Term.  Each Stock Option Agreement
shall specify the date when all or any installment of the Option is to become
exercisable.  An Option shall become exercisable at least as rapidly as set
forth in the following schedule:


<TABLE>
<CAPTION>
                 Anniversary of                    Percentage of Shares
                 Date of Grant                          Exercisable
                 --------------                    ----------------
  <S>                                                                       <C>
  First .....................                                                20%
  Second ....................                                                40%
  Third .....................                                                60%
  Fourth ....................                                                80%
  Fifth .....................                                               100%
</TABLE>


Subject to the preceding sentence, the vesting of any Option shall be determined
by the Committee at its sole discretion. The Stock Option Agreement shall also
specify the term of the Option.  The term shall not exceed 10 years from the
date of grant, except as otherwise provided in Section 4(b).  Subject to the
preceding sentence, the Committee at its sole discretion shall determine when an
Option is to expire.


          (f)      Nontransferability.  During an Optionee's lifetime, his
Option(s) shall be exercisable only by him and shall not be transferable.  In
the event of an Optionee's





                                      -12-




<PAGE>   13
death, his Option(s) shall not be transferable other than by will, by a
beneficiary designation executed by the Optionee and delivered to the Company
or by the laws of descent and distribution.

          (g)      Termination of Service (Except by Death).  If an Optionee's
Service terminates for any reason other than his death, then his Option(s)
shall expire on the earliest of the following occasions:

          (i)  The expiration date determined pursuant to Subsection (e) above;

          (ii)  The date 90 days after the termination of his Service for any
reason other than Total and Permanent Disability; or

          (iii)  The date six months after the termination of his Service by
reason of Total and Permanent Disability.

The Optionee may exercise all or part of his Option(s) at any time before the
expiration of such Option(s) under the preceding sentence, but only to the
extent that such Option(s) had become exercisable before his Service terminated
or became exercisable as a result of the termination.  The balance of such
Option(s) shall lapse when the Optionee's Service terminates.  In the event
that the Optionee dies after the termination of his Service but before the
expiration of his Option(s), all or part of such Option(s) may be exercised
(prior to expiration) by the executors or administrators of the Optionee's
estate or by any person who has acquired such Option(s) directly from him by
bequest, beneficiary designation or inheritance, but only to the extent that
such Option(s) had





                                      -13-




<PAGE>   14
become exercisable before his Service terminated or became exercisable as a
result of the termination.

          (h)      Leaves of Absence.  For purposes of Subsection (g) above,
Service shall be deemed to continue while the Optionee is on military leave,
sick leave or other bona fide leave of absence (as determined by the
Committee).  The foregoing notwithstanding, in the case of an ISO granted under
the Plan, Service shall not be deemed to continue beyond the first 90 days of
such leave, unless the Optionee's reemployment rights are guaranteed by statute
or by contract.

          (i)      Death of Optionee.  If an Optionee dies while he is in
Service, then his Option(s) shall expire on the earlier of the following dates:

          (i)  The expiration date determined pursuant to Subsection (e) above;
or

          (ii)  The date six months after his death.

All or part of the Optionee's Option(s) may be exercised at any time before the
expiration of such Option(s) under the preceding sentence by the executors or
administrators of his estate or by any person who has acquired such Option(s)
directly from him by bequest, beneficiary designation or inheritance, but only
to the extent that such Option(s) had become exercisable before his death or
became exercisable as a result of his death.  The balance of such Option(s)
shall lapse when the Optionee dies.





                                      -14-




<PAGE>   15
          (j)      No Rights as a Stockholder.  An Optionee, or a transferee of
an Optionee, shall have no rights as a stockholder with respect to any Shares
covered by his Option until the date of the issuance of a stock certificate for
such Shares.  No adjustments shall be made, except as provided in Section 9.

          (k)      Modification, Extension and Renewal of Options.  Within the
limitations of the Plan, the Committee may modify, extend or renew outstanding
Options or may accept the cancellation of outstanding Options (to the extent
not previously exercised) in return for the grant of new Options at the same or
a different price.  The foregoing notwithstanding, no modification of an Option
shall, without the consent of the Optionee, impair his rights or increase his
obligations under such Option.

          (l)      Restrictions on Transfer of Shares.  Any Shares issued upon
exercise of an Option shall be subject to such special forfeiture conditions,
rights of repurchase, rights of first offer and other transfer restrictions as
the Committee may determine.  Such restrictions shall be set forth in the
applicable Stock Option Agreement and shall apply in addition to any general
restrictions that may apply to all holders of Shares.  Any service-based
vesting conditions shall not be less rapid than the schedule set forth in
Subsection (e) above.





                                      -15-




<PAGE>   16
SECTION 8.  PAYMENT FOR SHARES.

          (a)  General Rule.  The entire Purchase Price or Exercise Price of
Shares issued under the Plan shall be payable in lawful money of the United
States of America at the time when such Shares are purchased, except as
follows:

          (i)  In the case of Shares sold under the terms of a Stock Purchase
Agreement subject to the Plan, payment shall be made only pursuant to the
express provisions of such Stock Purchase Agreement.  However, the Committee
(at its sole discretion) may specify in the Stock Purchase Agreement that
payment may be made in one or both of the forms described in Subsections (e)
and (f) below.

          (ii)  In the case of an ISO granted under the Plan, payment shall be
made only pursuant to the express provisions of the applicable Stock Option
Agreement.  However, the Committee (at its sole discretion) may specify in
the Stock Option Agreement that payment may be made in one or more of the
forms described in Subsections (b), (c), (d) or (f) below.

          (iii)  In the case of a Nonstatutory Option granted under the Plan,
the Committee (at its sole discretion) may accept payment in one or more of
the forms described in Subsections (b), (c), (d) or (f) below.

          (b)  Surrender of Stock.  To the extent that this Subsection (b) is
applicable, payment may be made all or in





                                      -16-




<PAGE>   17
part with Shares which have already been owned by the Optionee or his
representative for more than 12 months and which are surrendered to the Company
in good form for transfer.  Such Shares shall be valued at their Fair Market
Value on the date when the new Shares are purchased under the Plan.

          (c)      Exercise/Sale.  To the extent that this Subsection (c) is
applicable, if and when there is a public market for the Company's Common
Stock, payment may be made by the delivery (on a form prescribed by the
Company) of an irrevocable direction to a securities broker approved by the
Committee to sell Common Shares and to deliver all or part of the sales
proceeds to the Company in payment of all or part of the Purchase Price or
Exercise Price and any withholding taxes.  This Subsection (c) shall be
inapplicable to a person who is considered a director or officer of the
Company, to the extent required by section 16 of the Exchange Act or any rule
thereunder.

          (d)      Exercise/Pledge.  To the extent that this Subsection (d) is
applicable, if and when there is a public market for the Company's Common
Stock, payment may be made by the delivery (on a form prescribed by the
Company) of an irrevocable direction to pledge Common Shares to a securities
broker or lender approved by the Company, as security for a loan and to deliver
all or part of the loan proceeds to the Company in payment of all or part of
the Exercise Price and any withholding taxes.





                                      -17-




<PAGE>   18
          (e)  Services Rendered.  To the extent that this Subsection (e) is
applicable, Shares may be awarded under the Plan in consideration of services
rendered to the Company or a Subsidiary prior to the award.  If Shares are
awarded without the payment of a Purchase Price in cash, the Committee shall
make a determination (at the time of the award) of the value of the services
rendered by the Offeree and the sufficiency of the consideration to meet the
requirements of Section 6(c).

          (f)  Promissory Note.  To the extent that this Subsection (f) is
applicable, a portion of the Purchase Price or Exercise Price, as the case may
be, of Shares issued under the Plan may be payable by a full-recourse
promissory note, provided that (i) the par value of such Shares must be paid in
lawful money of the United States of America at the time when such Shares are
purchased, (ii) the Shares are security for payment of the principal amount of
the promissory note and interest thereon, and (iii) the interest rate payable
under the terms of the promissory note shall be no less than the minimum rate
(if any) required to avoid the imputation of additional interest under the
Code.  Subject to the foregoing, the Committee (at its sole discretion) shall
specify the term, interest rate, amortization requirements (if any), and other
provisions of such note.





                                      -18-




<PAGE>   19
SECTION 9.  ADJUSTMENT OF SHARES.

          (a)      General.  In the event of a subdivision of the outstanding
Stock, a declaration of a dividend payable in Shares, a declaration of a
dividend payable in a form other than Shares in an amount that has a material
effect on the value of Shares, a combination or consolidation of the
outstanding Stock (by reclassification or otherwise) into a lesser number of
Shares, a recapitalization or a similar occurrence, the Committee shall make
appropriate adjustments in one or more of (i) the number of Shares available
for future grants under Section 5, (ii) the number of Shares covered by each
outstanding Option or (iii) the Exercise Price under each outstanding Option.

          (b)      Mergers; Consolidations.  In the event that the Company is a
party to a merger or consolidation, outstanding Options shall be subject to the
agreement of merger or consolidation.  Such agreement may provide for the
assumption of outstanding Options by the surviving corporation or its parent or
for their continuation by the Company (if the Company is the surviving
corporation).  In the event the Company is not the surviving corporation and
the surviving corporation will not assume the outstanding Options, the
agreement of merger or consolidation may provide for payment of a cash
settlement for exercisable Options equal to the difference between the amount 
to be paid for one Share under such agreement and the Exercise Price




                                      -19-




<PAGE>   20
and for the cancellation of Options not exercised or settled, in either case
without the Optionees' consent.

          (c)      Reservation of Rights.  Except as provided in this Section
9, an Optionee or Offeree shall have no rights by reason of any subdivision or
consolidation of shares of stock of any class, the payment of any dividend or
any other increase or decrease in the number of shares of stock of any class.
Any issue by the Company of shares of stock of any class, or securities
convertible into shares of stock of any class, shall not affect, and no
adjustment by reason thereof shall be made with respect to, the number or
Exercise Price of Shares subject to an Option.  The grant of an Option pursuant
to the Plan shall not affect in any way the right or power of the Company to
make adjustments, reclassifications, reorganizations or changes of its capital
or business structure, to merge or consolidate or to dissolve, liquidate, sell
or transfer all or any part of its business or assets.





                                      -20-




<PAGE>   21
SECTION 10.  SECURITIES LAWS.

          Shares shall not be issued under the Plan unless the issuance and
delivery of such Shares complies with (or is exempt from) all applicable
requirements of law, including (without limitation) the Securities Act of 1933,
as amended, the rules and regulations promulgated thereunder, state securities
laws and regulations, and the regulations of any stock exchange on which the
Company's securities may then be listed.



SECTION 11.  NO EMPLOYMENT RIGHTS.

          No provision of the Plan, nor any right or Option granted under the
Plan, shall be construed to give any person any right to become, to be treated
as, or to remain an Employee.  The Company and its Subsidiaries reserve the
right to terminate any person's Service at any time and for any reason.



SECTION 12.  DURATION AND AMENDMENTS.

          (a)      Term of the Plan.  The Plan, as set forth herein, shall 
become effective on May 17, 1996, the date the Board of Directors amended and 
restated the Plan. In the event that the stockholders fail to approve the 
amendment to Section 5(a) of the Plan increasing the number of Shares subject 
to the Plan by 300,000 Shares within 12 months after its adoption by the Board 
of





                                      -21-




<PAGE>   22
Directors, on May 17, 1996, subject to the approval of the Company's
Stockholders of such amendment any Option grants or Stock awards made in excess
of an aggregate of 1,392,000 Shares shall be null and void.  The Plan shall
terminate automatically 10 years after its amendment and restatement by the
Board of Directors on May 17, 1996 and may be terminated on any earlier date
pursuant to Subsection (b) below.

          (b)      Right to Amend or Terminate the Plan.  The Board of
Directors may amend, suspend or terminate the Plan at any time and for any
reason; provided, however, that any amendment of the Plan which increases the
number of Shares available for issuance under the Plan (except as provided in
Section 9), or which materially changes the class of persons who are eligible
for the grant of ISOs, shall be subject to the approval of the Company's
stockholders.  Stockholder approval shall not be required for any other
amendment of the Plan.

          (c)      Effect of Amendment or Termination.  No Shares shall be
issued or sold under the Plan after the termination thereof, except upon
exercise of an Option granted prior to such termination.  The termination of
the Plan, or any amendment thereof, shall not affect any Share previously
issued or any Option previously granted under the Plan.





                                      -22-




<PAGE>   23
SECTION 13.  EXECUTION.

          To record the amendment of the Plan by the Board of Directors on
May 17, 1996, the Company has caused its authorized officer to execute the same.



                                       BIOSITE DIAGNOSTICS INCORPORATED





                                       By  /s/ KIM D. BLICKENSTAFF   
                                          -----------------------------






                                      -23-





<PAGE>   1

                                                                   Exhibit 10.2



                          1996 STOCK INCENTIVE PLAN OF

                        BIOSITE DIAGNOSTICS INCORPORATED

                      (Adopted Effective December 1, 1996)
<PAGE>   2
                               TABLE OF CONTENTS


<TABLE>
<S>            <C>                                                                                                            <C>
ARTICLE 1.     INTRODUCTION   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   1

ARTICLE 2.     ADMINISTRATION   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   1
     2.1       Committee Composition  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   1
     2.2       Committee Responsibilities   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   2

ARTICLE 3.     SHARES AVAILABLE FOR GRANTS.   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   2
     3.1       Basic Limitation   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   2
     3.2       Additional Shares  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   2
     3.3       Dividend Equivalents   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   2

ARTICLE 4.     ELIGIBILITY  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   2
     4.1       General Rules  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   2
     4.2       Outside Directors  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   3
     4.3       Incentive Stock Options  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   3

ARTICLE 5.     OPTIONS  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   3
     5.1       Stock Option Agreement   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   3
     5.2       Number of Shares   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   3
     5.3       Exercise Price   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   3
     5.4       Exercisability and Term  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   4
     5.5       Effect of Change in Control  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   4
     5.6       Modification or Assumption of Options.   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   4
     5.7       Other Requirements Prior to Company's Initial Public Offering  . . . . . . . . . . . . . . . . . . . . . . .   4

ARTICLE 6.     PAYMENT FOR OPTION SHARES  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   4
     6.1       General Rule   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   4
     6.2       Surrender of Stock   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   5
     6.3       Exercise/Sale  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   5
     6.4       Exercise/Pledge  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   5
     6.5       Promissory Note  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   5
     6.6       Other Forms of Payment   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   5

ARTICLE 7.     STOCK APPRECIATION RIGHTS  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   5
     7.1       SAR Agreement  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   5
     7.2       Number of Shares   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   6
     7.3       Exercise Price   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   6
     7.4       Exercisability and Term  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   6
     7.5       Effect of Change in Control  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   6
     7.6       Exercise of SARs   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   6
     7.7       Modification or Assumption of SARs.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   6

ARTICLE 8.     RESTRICTED SHARES AND STOCK UNITS  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   7
     8.1       Time, Amount and Form of Awards  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   7
     8.2       Payment for Awards   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   7
     8.3       Vesting Conditions   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   7
     8.4       Form and Time of Settlement of Stock Units   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   7
     8.5       Death of Recipient   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   8
     8.6       Creditors' Rights  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   8
</TABLE>





                                      -i-



<PAGE>   3
<TABLE>
<S>            <C>                                                                                                           <C>
ARTICLE 9.     VOTING AND DIVIDEND RIGHTS   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   8
     9.1       Restricted Shares  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   8
     9.2       Stock Units  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   8

ARTICLE 10.    PROTECTION AGAINST DILUTION  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   8
     10.1      Adjustments  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   8
     10.2      Reorganizations  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   9

ARTICLE 11.    AWARDS UNDER OTHER PLANS   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   9

ARTICLE 12.    PAYMENT OF DIRECTOR'S FEES IN SECURITIES   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   9
     12.1      Effective Date   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   9
     12.2      Elections to Receive NSOs, Restricted Shares or Stock Units  . . . . . . . . . . . . . . . . . . . . . . . .   9
     12.3      Number and Terms of NSOs, Restricted Shares or Stock Units   . . . . . . . . . . . . . . . . . . . . . . . .   9

ARTICLE 13.    LIMITATION ON RIGHTS   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  10
     13.1      Retention Rights   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  10
     13.2      Stockholders' Rights   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  10
     13.3      Regulatory Requirements  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  10

ARTICLE 14.    LIMITATION ON PAYMENTS   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  10
     14.1      Basic Rule   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  10
     14.2      Reduction of Payments  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  11
     14.3      Overpayments and Underpayments   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  11
     14.4      Related Corporations   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  12

ARTICLE 15.    WITHHOLDING TAXES  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  12
     15.1      General  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  12
     15.2      Share Withholding  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  12

ARTICLE 16.    ASSIGNMENT OR TRANSFER OF AWARDS   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  12
     16.1      General  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  12
     16.2      Trusts   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  12

ARTICLE 17.    FUTURE OF THE PLAN   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  13
     17.1      Term of the Plan   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  13
     17.2      Amendment or Termination   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  13

ARTICLE 18.    DEFINITIONS  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  13

ARTICLE 19.    EXECUTION  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  17
</TABLE>





                                      -ii-



<PAGE>   4
                          1996 STOCK INCENTIVE PLAN OF

                        BIOSITE DIAGNOSTICS INCORPORATED


         ARTICLE 1.  INTRODUCTION.

         The Plan was adopted by the Board on December 5, 1996, subject to
approval by the Company's stockholders.  The Plan is effective December 1,
1996.  However, Articles 7, 8 and 9 shall not apply prior to the Company's
initial public offering.

         The purpose of the Plan is to promote the long-term success of the
Company and the creation of stockholder value by (a) encouraging Key Employees
to focus on critical long-range objectives, (b) encouraging the attraction and
retention of Key Employees with exceptional qualifications and (c) linking Key
Employees directly to stockholder interests through increased stock ownership.
The Plan seeks to achieve this purpose by providing for Awards in the form of
Restricted Shares, Stock Units, Options (which may constitute incentive stock
options or nonstatutory stock options) or stock appreciation rights.

         The Plan shall be governed by, and construed in accordance with, the
laws of the State of California.

         ARTICLE 2.  ADMINISTRATION.

         2.1       Committee Composition.  The Plan shall be administered by
the Committee.  Except as provided below, the Committee shall consist
exclusively of directors of the Company, who shall be appointed by the Board.
In addition, the composition of the Committee shall satisfy:

                   (a)  Such requirements, if any, as the Securities and
         Exchange Commission may establish for administrators acting under
         plans intended to qualify for exemption under Rule 16b-3 (or its
         successor) under the Exchange Act; and

                   (b)  Such requirements as the Internal Revenue Service may
         establish for outside directors acting under plans intended to qualify
         for exemption under section 162(m)(4)(C) of the Code.

The Board may act on its own behalf with respect to Outside Directors and may
also appoint one or more separate committees composed of one or more officers
of the Company who need not be directors of the Company and who need not
satisfy the foregoing requirements, who may administer the Plan with respect to
Key Employees who are not "covered employees" under section 162(m)(3) of the
Code and who are not required to report pursuant to Section  16(a) of the
Exchange Act.





                                      -1-



<PAGE>   5
         2.2       Committee Responsibilities.  The Committee shall (a) select
the Key Employees who are to receive Awards under the Plan, (b) determine the
type, number, vesting requirements and other features and conditions of such
Awards, (c) interpret the Plan and (d) make all other decisions relating to the
operation of the Plan.  The Committee may adopt such rules or guidelines as it
deems appropriate to implement the Plan.  The Committee's determinations under
the Plan shall be final and binding on all persons.

         ARTICLE 3.  SHARES AVAILABLE FOR GRANTS.

         3.1       Basic Limitation.  Common Shares issued pursuant to the Plan
may be authorized but unissued shares or treasury shares.  The aggregate number
of Common Shares available for Restricted Shares, Stock Units, Options and SARs
awarded under the Plan shall not exceed 900,000.  Of the Common Shares
available hereunder, no more than 20% in aggregate shall be available with
respect to Outside Directors.  The limitation of this Section 3.1 shall be
subject to adjustment pursuant to Article 10.  The number of Common Shares
available under this Plan shall be increased by unexercised or forfeited Common
Shares under the Company's 1989 Stock Plan.

         3.2       Additional Shares.  If Stock Units, Options or SARs are
forfeited or if Options or SARs terminate for any other reason before being
exercised, then the corresponding Common Shares shall again become available
for Awards under the Plan.  If Restricted Shares are forfeited before any
dividends have been paid with respect to such Shares, then such Shares shall
again become available for Awards under the Plan.  If Stock Units are settled,
then only the number of Common Shares (if any) actually issued in settlement of
such Stock Units shall reduce the number available under Section 3.1 and the
balance shall again become available for Awards under the Plan.  If SARs are
exercised, then only the number of Common Shares (if any) actually issued in
settlement of such SARs shall reduce the number available under Section 3.1 and
the balance shall again become available for Awards under the Plan.

         3.3       Dividend Equivalents.  Any dividend equivalents distributed
under the Plan shall not be applied against the number of Restricted Shares,
Stock Units, Options or SARs available for Awards, whether or not such dividend
equivalents are converted into Stock Units.

         ARTICLE 4.  ELIGIBILITY.

         4.1       General Rules.  Only Key Employees (including, without
limitation, independent contractors who are not members of the Board) shall be
eligible for designation as Participants by the Committee.





                                      -2-



<PAGE>   6
         4.2       Outside Directors.  The Committee may provide that the NSOs
that otherwise would be granted to an Outside Director under this Plan shall
instead be granted to an affiliate of such Outside Director.  Such affiliate
shall then be deemed to be an Outside Director for purposes of the Plan,
provided that the service-related vesting and termination provisions pertaining
to the NSOs shall be applied with regard to the service of the Outside
Director.

         4.3       Incentive Stock Options.  Only Key Employees who are
common-law employees of the Company, a Parent or a Subsidiary shall be eligible
for the grant of ISOs.  In addition, a Key Employee who owns more than 10% of
the total combined voting power of all classes of outstanding stock of the
Company or any of its Parents or Subsidiaries shall not be eligible for the
grant of an ISO unless the requirements set forth in section 422(c)(6) of the
Code are satisfied.

         ARTICLE 5.  OPTIONS.

         5.1       Stock Option Agreement.  Each grant of an Option under the
Plan shall be evidenced by a Stock Option Agreement between the Optionee and
the Company.  Such Option shall be subject to all applicable terms of the Plan
and may be subject to any other terms that are not inconsistent with the Plan.
The Stock Option Agreement shall specify whether the Option is an ISO or an
NSO.  The provisions of the various Stock Option Agreements entered into under
the Plan need not be identical.  Options may be granted in consideration of a
cash payment or in consideration of a reduction in the Optionee's other
compensation.  A Stock Option Agreement may provide that a new Option will be
granted automatically to the Optionee when he or she exercises a prior Option
and pays the Exercise Price in the form described in Section 6.2.

         5.2       Number of Shares.  Each Stock Option Agreement shall specify
the number of Common Shares subject to the Option and shall provide for the
adjustment of such number in accordance with Article 10.  Options granted to
any Optionee in a single calendar year shall in no event cover more than
250,000 Common Shares, subject to adjustment in accordance with Article 10.

         5.3       Exercise Price.  Each Stock Option Agreement shall specify
the Exercise Price; provided that the Exercise Price under an ISO shall in no
event be less than 100% of the Fair Market Value of a Common Share on the date
of grant and the Exercise Price under an NSO shall in no event be less than the
par value of the Common Shares subject to such NSO.  In the case of an NSO, a
Stock Option Agreement may specify an Exercise Price that varies in accordance
with a predetermined formula while the NSO is outstanding, provided that prior
to the Company's initial public offering, the NSO Exercise Price shall be at
least 85% (110% for 10% shareholders) of the Fair Market Value of a Common
Share of Stock on the date of grant.





                                      -3-



<PAGE>   7
         5.4       Exercisability and Term.  Each Stock Option Agreement shall
specify the date when all or any installment of the Option is to become
exercisable, provided that prior to the Company's initial public offering,
Options shall become exercisable pursuant to a schedule providing for at least
20% vesting per year over a five-year period (or, in the case of performance
options, to the extent permitted under applicable regulations of the California
Department of Corporations).  The Stock Option Agreement shall also specify the
term of the Option; provided that the term of an ISO shall in no event exceed
10 years from the date of grant.  A Stock Option Agreement may provide for
accelerated exercisability in the event of the Optionee's death, disability or
retirement or other events and may provide for expiration prior to the end of
its term in the event of the termination of the Optionee's service.
Notwithstanding the foregoing, no Options may be accelerated prior to the
Company's initial public offering.

         Options may be awarded in combination with SARs, and such an Award may
provide that the Options will not be exercisable unless the related SARs are
forfeited.  NSOs may also be awarded in combination with Restricted Shares or
Stock Units, and such an Award may provide that the NSOs will not be
exercisable unless the related Restricted Shares or Stock Units are forfeited.

         Prior to the Company's initial public offering, Options must be
exercised within 30 days of the termination of employment (six months for
termination on account of death or disability).

         5.5       Effect of Change in Control.  The Committee may determine,
at the time of granting an Option or thereafter, that such Option shall become
fully exercisable as to all Common Shares subject to such Option in the event
that a Change in Control occurs with respect to the Company.

         5.6       Modification or Assumption of Options.  Within the
limitations of the Plan, the Committee may modify, extend or assume outstanding
options or may accept the cancellation of outstanding options (whether granted
by the Company or by another issuer) in return for the grant of new options for
the same or a different number of shares and at the same or a different
exercise price.  The foregoing notwithstanding, no modification of an Option
shall, without the consent of the Optionee, alter or impair his or her rights
or obligations under such Option.

         5.7       Other Requirements Prior to Company's Initial Public
Offering.  Prior to the Company's initial public offering, Optionees shall
receive Company financial statements at least annually.

         ARTICLE 6.  PAYMENT FOR OPTION SHARES.

         6.1       General Rule.  The entire Exercise Price of Common Shares
issued upon exercise of Options shall be payable in cash at the time when such
Common Shares are purchased, except as follows:





                                      -4-



<PAGE>   8
                   (a)  In the case of an ISO granted under the Plan, payment
         shall be made only pursuant to the express provisions of the
         applicable Stock Option Agreement.  The Stock Option Agreement may
         specify that payment may be made in any form(s) described in this
         Article 6.

                   (b)  In the case of an NSO, the Committee may at any time
         accept payment in any form(s) described in this Article 6.
 
         6.2       Surrender of Stock.  To the extent that this Section 6.2 is
applicable, payment for all or any part of the Exercise Price may be made with
Common Shares which have already been owned by the Optionee for more than six
months.  Such Common Shares shall be valued at their Fair Market Value on the
date when the new Common Shares are purchased under the Plan.

         6.3       Exercise/Sale.  To the extent that this Section 6.3 is
applicable, payment may be made by the delivery (on a form prescribed by the
Company) of an irrevocable direction to a securities broker approved by the
Company to sell Common Shares and to deliver all or part of the sales proceeds
to the Company in payment of all or part of the Exercise Price and any
withholding taxes.

         6.4       Exercise/Pledge.  To the extent that this Section 6.4 is
applicable, payment may be made by the delivery (on a form prescribed by the
Company) of an irrevocable direction to pledge Common Shares to a securities
broker or lender approved by the Company, as security for a loan, and to
deliver all or part of the loan proceeds to the Company in payment of all or
part of the Exercise Price and any withholding taxes.

         6.5       Promissory Note.  To the extent that this Section 6.5 is
applicable, payment may be made with a full-recourse promissory note; provided
that the par value of the Common Shares shall be paid in cash.

         6.6       Other Forms of Payment.  To the extent that this Section 6.6
is applicable, payment may be made in any other form that is consistent with
applicable laws, regulations and rules.

         ARTICLE 7.  STOCK APPRECIATION RIGHTS.

         7.1       SAR Agreement.  Each grant of an SAR under the Plan shall be
evidenced by an SAR Agreement between the Optionee and the Company.  Such SAR
shall be subject to all applicable terms of the Plan and may be subject to any
other terms that are not inconsistent with the Plan.  The provisions of the
various SAR Agreements entered into under the Plan need not be identical.  SARs
may be granted in consideration of a reduction in the Optionee's other
compensation.





                                      -5-



<PAGE>   9
         7.2       Number of Shares.  Each SAR Agreement shall specify the
number of Common Shares to which the SAR pertains and shall provide for the
adjustment of such number in accordance with Article 10.  SARs granted to any
Optionee in a single calendar year shall in no event pertain to more than
250,000 Common Shares, subject to adjustment in accordance with Article 10.

         7.3       Exercise Price.  Each SAR Agreement shall specify the
Exercise Price.  An SAR Agreement may specify an Exercise Price that varies in
accordance with a predetermined formula while the SAR is outstanding.

         7.4       Exercisability and Term.  Each SAR Agreement shall specify
the date when all or any installment of the SAR is to become exercisable.  The
SAR Agreement shall also specify the term of the SAR.  An SAR Agreement may
provide for accelerated exercisability in the event of the Optionee's death,
disability or retirement or other events and may provide for expiration prior
to the end of its term in the event of the termination of the Optionee's
service.  SARs may also be awarded in combination with Options, Restricted
Shares or Stock Units, and such an Award may provide that the SARs will not be
exercisable unless the related Options, Restricted Shares or Stock Units are
forfeited.  An SAR may be included in an ISO only at the time of grant but may
be included in an NSO at the time of grant or thereafter.  An SAR granted under
the Plan may provide that it will be exercisable only in the event of a Change
in Control.

         7.5       Effect of Change in Control.  The Committee may determine,
at the time of granting an SAR or thereafter, that such SAR shall become fully
exercisable as to all Common Shares subject to such SAR in the event that a
Change in Control occurs with respect to the Company.

         7.6       Exercise of SARs.  The exercise of an SAR shall be subject
to the restrictions imposed by Rule 16b-3 (or its successor) under the Exchange
Act, if applicable.  If, on the date when an SAR expires, the Exercise Price
under such SAR is less than the Fair Market Value on such date but any portion
of such SAR has not been exercised or surrendered, then such SAR shall
automatically be deemed to be exercised as of such date with respect to such
portion.  Upon exercise of an SAR, the Optionee (or any person having the right
to exercise the SAR after his or her death) shall receive from the Company (a)
Common Shares, (b) cash or (c) a combination of Common Shares and cash, as the
Committee shall determine.  The amount of cash and/or the Fair Market Value of
Common Shares received upon exercise of SARs shall, in the aggregate, be equal
to the amount by which the Fair Market Value (on the date of surrender) of the
Common Shares subject to the SARs exceeds the Exercise Price.

         7.7       Modification or Assumption of SARs.  Within the limitations
of the Plan, the Committee may modify, extend or assume outstanding SARs or may
accept the cancellation of outstanding





                                      -6-



<PAGE>   10
SARs (whether granted by the Company or by another issuer) in return for the
grant of new SARs for the same or a different number of shares and at the same
or a different exercise price.  The foregoing notwithstanding, no modification
of an SAR shall, without the consent of the Optionee, alter or impair his or
her rights or obligations under such SAR.

         ARTICLE 8.  RESTRICTED SHARES AND STOCK UNITS.

         8.1       Time, Amount and Form of Awards.  Awards under the Plan may
be granted in the form of Restricted Shares, in the form of Stock Units, or in
any combination of both.  Restricted Shares or Stock Units may also be awarded
in combination with NSOs or SARs, and such an Award may provide that the
Restricted Shares or Stock Units will be forfeited in the event that the
related NSOs or SARs are exercised.

         8.2       Payment for Awards.  To the extent that an Award is granted
in the form of newly issued Restricted Shares, the Award recipient, as a
condition to the grant of such Award, shall be required to pay the Company in
cash an amount equal to the par value of such Restricted Shares.  To the extent
that an Award is granted in the form of Restricted Shares from the Company's
treasury or in the form of Stock Units, no cash consideration shall be required
of the Award recipients.

         8.3       Vesting Conditions.  Each Award of Restricted Shares or
Stock Units shall become vested, in full or in installments, upon satisfaction
of the conditions specified in the Stock Award Agreement.  A Stock Award
Agreement may provide for accelerated vesting in the event of the Participant's
death, disability or retirement or other events.  The Committee may determine,
at the time of making an Award or thereafter, that such Award shall become
fully vested in the event that a Change in Control occurs with respect to the
Company.

         8.4       Form and Time of Settlement of Stock Units.  Settlement of
vested Stock Units may be made in the form of (a) cash, (b) Common Shares or
(c) any combination of both, as determined by the Committee.  The actual number
of Stock Units eligible for settlement may be larger or smaller than the number
included in the original Award, based on predetermined performance factors.
Methods of converting Stock Units into cash may include (without limitation) a
method based on the average Fair Market Value of Common Shares over a series of
trading days.  Vested Stock Units may be settled in a lump sum or in
installments.  The distribution may occur or commence when all vesting
conditions applicable to the Stock Units have been satisfied or have lapsed, or
it may be deferred to any later date.  The amount of a deferred distribution
may be increased by an interest factor or by dividend equivalents.  Until an
Award of Stock Units is settled, the number of such Stock Units shall be
subject to adjustment pursuant to Article 10.





                                      -7-



<PAGE>   11
         8.5       Death of Recipient.  Any Stock Units Award that becomes
payable after the recipient's death shall be distributed to the recipient's
beneficiary or beneficiaries.  Each recipient of a Stock Units Award under the
Plan shall designate one or more beneficiaries for this purpose by filing the
prescribed form with the Company.  A beneficiary designation may be changed by
filing the prescribed form with the Company at any time before the Award
recipient's death.  If no beneficiary was designated or if no designated
beneficiary survives the Award recipient, then any Stock Units Award that
becomes payable after the recipient's death shall be distributed to the
recipient's estate.

         8.6       Creditors' Rights.  A holder of Stock Units shall have no
rights other than those of a general creditor of the Company.  Stock Units
represent an unfunded and unsecured obligation of the Company, subject to the
terms and conditions of the applicable Stock Award Agreement.

         ARTICLE 9.  VOTING AND DIVIDEND RIGHTS.

         9.1       Restricted Shares.  The holders of Restricted Shares awarded
under the Plan shall have the same voting, dividend and other rights as the
Company's other stockholders.  A Stock Award Agreement, however, may require
that the holders of Restricted Shares invest any cash dividends received in
additional Restricted Shares.  Such additional Restricted Shares shall be
subject to the same conditions and restrictions as the Award with respect to
which the dividends were paid.  Such additional Restricted Shares shall not
reduce the number of Common Shares available under Article 3.

         9.2       Stock Units.  The holders of Stock Units shall have no
voting rights.  Prior to settlement or forfeiture, any Stock Unit awarded under
the Plan may, at the Committee's discretion, carry with it a right to dividend
equivalents.  Such right entitles the holder to be credited with an amount
equal to all cash dividends paid on one Common Share while the Stock Unit is
outstanding.  Dividend equivalents may be converted into additional Stock
Units.  Settlement of dividend equivalents may be made in the form of cash, in
the form of Common Shares, or in a combination of both.  Prior to distribution,
any dividend equivalents which are not paid shall be subject to the same
conditions and restrictions as the Stock Units to which they attach.

         ARTICLE 10.  PROTECTION AGAINST DILUTION.

         10.1      Adjustments.  In the event of a subdivision of the
outstanding Common Shares, a declaration of a dividend payable in Common
Shares, a declaration of a dividend payable in a form other than Common Shares
in an amount that has a material effect on the price of Common Shares, a
combination or consolidation of the outstanding Common Shares (by
reclassification or otherwise) into a lesser number of Common Shares, a
recapitalization, a spinoff or a similar occurrence, the Committee shall make
such adjustments as





                                      -8-



<PAGE>   12
it, in its sole discretion, deems appropriate in one or more of (a) the number
of Options, SARs, Restricted Shares and Stock Units available for future Awards
under Article 3, (b) the limitations set forth in Sections 5.2 and 7.2, (c) the
number of NSOs to be granted to Outside Directors under Section 4.2, (d) the
number of Stock Units included in any prior Award which has not yet been
settled, (e) the number of Common Shares covered by each outstanding Option and
SAR or (f) the Exercise Price under each outstanding Option and SAR.  Except as
provided in this Article 10, a Participant shall have no rights by reason of
any issue by the Company of stock of any class or securities convertible into
stock of any class, any subdivision or consolidation of shares of stock of any
class, the payment of any stock dividend or any other increase or decrease in
the number of shares of stock of any class.

         10.2      Reorganizations.  In the event that the Company is a party
to a merger or other reorganization, outstanding Options, SARs, Restricted
Shares and Stock Units shall be subject to the agreement of merger or
reorganization.  Such agreement may provide, without limitation, for the
assumption of outstanding Awards by the surviving corporation or its parent,
for their continuation by the Company (if the Company is a surviving
corporation), for accelerated vesting and accelerated expiration (provided the
Company has previously had its initial public offering), or for settlement in
cash.

         ARTICLE 11.  AWARDS UNDER OTHER PLANS.

         The Company may grant awards under other plans or programs.  Such
awards may be settled in the form of Common Shares issued under this Plan.
Such Common Shares shall be treated for all purposes under the Plan like Common
Shares issued in settlement of Stock Units and shall, when issued, reduce the
number of Common Shares available under Article 3.

         ARTICLE 12.  PAYMENT OF DIRECTOR'S FEES IN SECURITIES.

         12.1      Effective Date.  No provision of this Article 12 shall be
effective unless and until the Board has determined to implement such
provision.

         12.2      Elections to Receive NSOs, Restricted Shares or Stock Units.
An Outside Director may elect to receive his or her annual retainer payments
and meeting fees from the Company in the form of cash, NSOs, Restricted Shares,
Stock Units, or a combination thereof, as determined by the Board.  Such NSOs,
Restricted Shares and Stock Units shall be issued under the Plan.  An election
under this Article 12 shall be filed with the Company on the prescribed form.

         12.3      Number and Terms of NSOs, Restricted Shares or Stock Units.
The number of NSOs, Restricted Shares or Stock Units to be granted to Outside
Directors in lieu of annual retainers and meeting fees that would otherwise be
paid in cash shall be calculated





                                      -9-



<PAGE>   13
in a manner determined by the Board.  The terms of such NSOs, Restricted Shares
or Stock Units shall also be determined by the Board.

         ARTICLE 13.  LIMITATION ON RIGHTS.

         13.1      Retention Rights.  Neither the Plan nor any Award granted
under the Plan shall be deemed to give any individual a right to remain an
employee, consultant or director of the Company, a Parent or a Subsidiary.  The
Company and its Parents and Subsidiaries reserve the right to terminate the
service of any employee, consultant or director at any time, with or without
cause, subject to applicable laws, the Company's certificate of incorporation
and by-laws and a written employment agreement (if any).

         13.2      Stockholders' Rights.  A Participant shall have no dividend
rights, voting rights or other rights as a stockholder with respect to any
Common Shares covered by his or her Award prior to the issuance of a stock
certificate for such Common Shares.  No adjustment shall be made for cash
dividends or other rights for which the record date is prior to the date when
such certificate is issued, except as expressly provided in Articles 8, 9 and
10.

         13.3      Regulatory Requirements.  Any other provision of the Plan
notwithstanding, the obligation of the Company to issue Common Shares under the
Plan shall be subject to all applicable laws, rules and regulations and such
approval by any regulatory body as may be required.  The Company reserves the
right to restrict, in whole or in part, the delivery of Common Shares pursuant
to any Award prior to the satisfaction of all legal requirements relating to
the issuance of such Common Shares, to their registration, qualification or
listing or to an exemption from registration, qualification or listing.

         ARTICLE 14.  LIMITATION ON PAYMENTS.

         14.1      Basic Rule.  Any provision of the Plan to the contrary
notwithstanding, in the event that the independent auditors most recently
selected by the Board (the "Auditors") determine that any payment or transfer
by the Company under the Plan to or for the benefit of a Participant (a
"Payment") would be nondeductible by the Company for federal income tax
purposes because of the provisions concerning "excess parachute payments" in
section 280G of the Code, then the aggregate present value of all Payments
shall be reduced (but not below zero) to the Reduced Amount; provided that the
Committee, at the time of making an Award under this Plan or at any time
thereafter, may specify in writing that such Award shall not be so reduced and
shall not be subject to this Article 14.  For purposes of this Article 14, the
"Reduced Amount" shall be the amount, expressed as a present value, which
maximizes the aggregate present value of the Payments without causing any





                                      -10-



<PAGE>   14
Payment to be nondeductible by the Company because of section 280G of the Code.

         14.2      Reduction of Payments.  If the Auditors determine that any
Payment would be nondeductible by the Company because of section 280G of the
Code, then the Company shall promptly give the Participant notice to that
effect and a copy of the detailed calculation thereof and of the Reduced
Amount, and the Participant may then elect, in his or her sole discretion,
which and how much of the Payments shall be eliminated or reduced (as long as
after such election the aggregate present value of the Payments equals the
Reduced Amount) and shall advise the Company in writing of his or her election
within 10 days of receipt of notice.  If no such election is made by the
Participant within such 10-day period, then the Company may elect which and how
much of the Payments shall be eliminated or reduced (as long as after such
election the aggregate present value of the Payments equals the Reduced Amount)
and shall notify the Participant promptly of such election.  For purposes of
this Article 14, present value shall be determined in accordance with section
280G(d)(4) of the Code.  All determinations made by the Auditors under this
Article 14 shall be binding upon the Company and the Participant and shall be
made within 60 days of the date when a Payment becomes payable or transferable.
As promptly as practicable following such determination and the elections
hereunder, the Company shall pay or transfer to or for the benefit of the
Participant such amounts as are then due to him or her under the Plan and shall
promptly pay or transfer to or for the benefit of the Participant in the future
such amounts as become due to him or her under the Plan.

         14.3      Overpayments and Underpayments.  As a result of uncertainty
in the application of section 280G of the Code at the time of an initial
determination by the Auditors hereunder, it is possible that Payments will have
been made by the Company which should not have been made (an "Overpayment") or
that additional Payments which will not have been made by the Company could
have been made (an "Underpayment"), consistent in each case with the
calculation of the Reduced Amount hereunder.  In the event that the Auditors,
based upon the assertion of a deficiency by the Internal Revenue Service
against the Company or the Participant which the Auditors believe has a high
probability of success, determine that an Overpayment has been made, such
Overpayment shall be treated for all purposes as a loan to the Participant
which he or she shall repay to the Company, together with interest at the
applicable federal rate provided in section 7872(f)(2) of the Code; provided,
however, that no amount shall be payable by the Participant to the Company if
and to the extent that such payment would not reduce the amount which is
subject to taxation under section 4999 of the Code.  In the event that the
Auditors determine that an Underpayment has occurred, such Underpayment shall
promptly be paid or transferred by the Company to or for the benefit of the
Participant, together with interest at the applicable federal rate provided in
section 7872(f)(2) of the Code.





                                      -11-



<PAGE>   15
         14.4      Related Corporations.  For purposes of this Article 14, the
term "Company" shall include affiliated corporations to the extent determined
by the Auditors in accordance with section 280G(d)(5) of the Code.

         ARTICLE 15.  WITHHOLDING TAXES.

         15.1      General.  To the extent required by applicable federal,
state, local or foreign law, a Participant or his or her successor shall make
arrangements satisfactory to the Company for the satisfaction of any
withholding tax obligations that arise in connection with the Plan.  The
Company shall not be required to issue any Common Shares or make any cash
payment under the Plan until such obligations are satisfied.

         15.2      Share Withholding.  The Committee may permit a Participant
to satisfy all or part of his or her withholding or income tax obligations by
having the Company withhold all or a portion of any Common Shares that
otherwise would be issued to him or her or by surrendering all or a portion of
any Common Shares that he or she previously acquired.  Such Common Shares shall
be valued at their Fair Market Value on the date when taxes otherwise would be
withheld in cash.  Any payment of taxes by assigning Common Shares to the
Company may be subject to restrictions, including any restrictions required by
rules of the Securities and Exchange Commission.

         ARTICLE 16.   ASSIGNMENT OR TRANSFER OF AWARDS.

         16.1      General.  An Award granted under the Plan shall not be
anticipated, assigned, attached, garnished, optioned, transferred or made
subject to any creditor's process, whether voluntarily, involuntarily or by
operation of law, except as approved by the Committee.  Notwithstanding the
foregoing, ISOs and, prior to the Company's initial public offering, NSOs may
not be transferable.  However, this Article 16 shall not preclude a Participant
from designating a beneficiary who will receive any outstanding Awards in the
event of the Participant's death, nor shall it preclude a transfer of Awards by
will or by the laws of descent and distribution.

         16.2      Trusts.  Neither this Article 16 nor any other provision of
the Plan shall preclude a Participant from transferring or assigning Restricted
Shares to (a) the trustee of a trust that is revocable by such Participant
alone, both at the time of the transfer or assignment and at all times
thereafter prior to such Participant's death, or (b) the trustee of any other
trust to the extent approved in advance by the Committee in writing.  A
transfer or assignment of Restricted Shares from such trustee to any person
other than such Participant shall be permitted only to the extent approved in
advance by the Committee in writing, and Restricted Shares held by such trustee
shall be subject to all of the conditions and restrictions set forth in the
Plan and in the





                                      -12-



<PAGE>   16
applicable Stock Award Agreement, as if such trustee were a party to such
Agreement.

         ARTICLE 17.  FUTURE OF THE PLAN.

         17.1      Term of the Plan.  The Plan, as set forth herein, was
adopted on December 5, 1996, and shall become effective December 1, 1996,
except that Articles 7, 8 and 9 shall not be effective prior to the date of the
Company's initial public offering.  The Plan shall remain in effect until it is
terminated under Section 17.2, except that no ISOs shall be granted after
December 1, 2006.

         17.2      Amendment or Termination.  The Board may, at any time and
for any reason, amend or terminate the Plan.  An amendment of the Plan shall be
subject to the approval of the Company's stockholders only to the extent
required by applicable laws, regulations or rules.  No Awards shall be granted
under the Plan after the termination thereof.  The termination of the Plan, or
any amendment thereof, shall not affect any Award previously granted under the
Plan.

         ARTICLE 18.  DEFINITIONS.

         18.1      "Award" means any award of an Option, an SAR, a Restricted
Share or a Stock Unit under the Plan.

         18.2      "Board" means the Company's Board of Directors, as
constituted from time to time.

         18.3  "Change in Control" shall mean the occurrence of any of the
following events:

                   (a)  The consummation of a merger or consolidation of the
         Company with or into another entity or any other corporate
         reorganization, if more than 50% of the combined voting power of the
         continuing or surviving entity's securities outstanding immediately
         after such merger, consolidation or other reorganization is owned by
         persons who were not stockholders of the Company immediately prior to
         such merger, consolidation or other reorganization;

                   (b)  A change in the composition of the Board, as a result
         of which fewer than one-half of the incumbent directors are directors
         who either:

                               (A)  Had been directors of the Company 24 months
                   prior to such change; or

                               (B)  Were elected, or nominated for election, to
                   the Board with the affirmative votes of at least a majority
                   of the directors who had been directors of the Company 24
                   months prior to such change and who were





                                      -13-



<PAGE>   17
                   still in office at the time of the election or nomination; or

                   (c)  Any "person" (as such term is used in sections 13(d)
         and 14(d) of the Exchange Act) by the acquisition or aggregation of
         securities is or becomes the beneficial owner, directly or indirectly,
         of securities of the Company representing 50% or more of the combined
         voting power of the Company's then outstanding securities ordinarily
         (and apart from rights accruing under special circumstances) having
         the right to vote at elections of directors (the "Base Capital
         Stock"); except that any change in the relative beneficial ownership
         of the Company's securities by any person resulting solely from a
         reduction in the aggregate number of outstanding shares of Base
         Capital Stock, and any decrease thereafter in such person's ownership
         of securities, shall be disregarded until such person increases in any
         manner, directly or indirectly, such person's beneficial ownership of
         any securities of the Company.

The term "Change in Control" shall not include the Company's initial public
offering or a transaction, the sole purpose of which is to change the state of
the Company's incorporation.

         18.4      "Code" means the Internal Revenue Code of 1986, as amended.

         18.5      "Committee" means a committee of the Board, as described in
Article 2.

         18.6      "Common Share" means one share of the common stock of the
Company.

         18.7      "Company" means Biosite Diagnostics Incorporated, a Delaware
corporation.

         18.8      "Exchange Act" means the Securities Exchange Act of 1934, as
amended.

         18.9  "Exercise Price," in the case of an Option, means the amount for
which one Common Share may be purchased upon exercise of such Option, as
specified in the applicable Stock Option Agreement.  "Exercise Price," in the
case of an SAR, means an amount, as specified in the applicable SAR Agreement,
which is subtracted from the Fair Market Value of one Common Share in
determining the amount payable upon exercise of such SAR.

         18.10 "Fair Market Value" means the market price of Common Shares,
determined by the Committee as follows:

                   (a)  If the Common Shares were traded over-the-counter on
         the date in question but was not traded on the Nasdaq Stock Market or
         the Nasdaq National Market, then the Fair Market Value shall be equal
         to the mean between the last





                                      -14-



<PAGE>   18
         reported representative bid and asked prices quoted for such date by
         the principal automated inter-dealer quotation system on which the
         Common Shares are quoted or, if the Common Shares are not quoted on
         any such system, by the "Pink Sheets" published by the National
         Quotation Bureau, Inc.;

                   (b)  If the Common Shares were traded over-the-counter on
         the date in question and were traded on the Nasdaq Stock Market or the
         Nasdaq National Market, then the Fair Market Value shall be equal to
         the last-transaction price quoted for such date by the Nasdaq Stock
         Market or the Nasdaq National Market;

                   (c)  If the Common Shares were traded on a stock exchange on
         the date in question, then the Fair Market Value shall be equal to the
         closing price reported by the applicable composite transactions report
         for such date; and

                   (d)  If none of the foregoing provisions is applicable, then
         the Fair Market Value shall be determined by the Committee in good
         faith on such basis as it deems appropriate.

Whenever possible, the determination of Fair Market Value by the Committee
shall be based on the prices reported in the Western Edition of The Wall Street
Journal.  Such determination shall be conclusive and binding on all persons.

         18.11  "ISO" means an incentive stock option described in section
422(b) of the Code.

         18.12  "Key Employee" means (a) a common-law employee of the Company,
a Parent or a Subsidiary, (b) an Outside Director and (c) a consultant or
adviser who provides services to the Company, a Parent or a Subsidiary as an
independent contractor.  Service as an Outside Director or as an independent
contractor shall be considered employment for all purposes of the Plan, except
as provided in Sections 4.2 and 4.3.

         18.13  "NSO" means a stock option not described in sections 422 or 423
of the Code.

         18.14  "Option" means an ISO or NSO granted under the Plan and
entitling the holder to purchase one Common Share.

         18.15  "Optionee" means an individual or estate who holds an Option or
SAR.

         18.16  "Outside Director" shall mean a member of the Board who is not
a common-law employee of the Company, a Parent or a Subsidiary.

         18.17  "Parent" means any corporation (other than the Company) in an
unbroken chain of corporations ending with the Company, if each of the
corporations other than the Company owns





                                      -15-



<PAGE>   19
stock possessing 50% or more of the total combined voting power of all classes
of stock in one of the other corporations in such chain.  A corporation that
attains the status of a Parent on a date after the adoption of the Plan shall
be considered a Parent commencing as of such date.

         18.18  "Participant" means an individual or estate who holds an Award.

         18.19  "Plan" means this 1996 Stock Incentive Plan of Biosite
Diagnostics Incorporated, as amended from time to time.

         18.20  "Restricted Share" means a Common Share awarded under the Plan.

         18.21  "SAR" means a stock appreciation right granted under the Plan.

         18.22  "SAR Agreement" means the agreement between the Company and an
Optionee which contains the terms, conditions and restrictions pertaining to
his or her SAR.

         18.23  "Stock Award Agreement" means the agreement between the Company
and the recipient of a Restricted Share or Stock Unit which contains the terms,
conditions and restrictions pertaining to such Restricted Share or Stock Unit.

         18.24  "Stock Option Agreement" means the agreement between the
Company and an Optionee which contains the terms, conditions and restrictions
pertaining to his or her Option.

         18.25  "Stock Unit" means a bookkeeping entry representing the
equivalent of one Common Share, as awarded under the Plan.

         18.26  "Subsidiary" means any corporation (other than the Company) in
an unbroken chain of corporations beginning with the Company, if each of the
corporations other than the last corporation in the unbroken chain owns stock
possessing 50% or more of the total combined voting power of all classes of
stock in one of the other corporations in such chain.  A corporation that
attains the status of a Subsidiary on a date after the adoption of the Plan
shall be considered a Subsidiary commencing as of such date.





                                      -16-



<PAGE>   20
         ARTICLE 19.  EXECUTION.

         To record the adoption of the Plan by the Board, the Company has
caused its duly authorized officer to affix the corporate name and seal hereto.




                                       BIOSITE DIAGNOSTICS INCORPORATED




[SEAL]                                 By /s/ Kim D. Blickenstaff
                                          -----------------------------





                                      -17-




<PAGE>   1


                                                                   Exhibit 10.3


         1996 STOCK INCENTIVE PLAN OF BIOSITE DIAGNOSTICS INCORPORATED:

                        INCENTIVE STOCK OPTION AGREEMENT


Biosite Diagnostics Incorporated, a Delaware corporation (the "Company"),
hereby grants an option to purchase shares of its common stock to the optionee
named below.  The terms and conditions of the option are set forth in this
cover sheet, in the attachment and in the 1996 Stock Incentive Plan of Biosite
Diagnostics Incorporated (the "Plan").


Date of Option Grant: ___________ ___, 199__

Name of Optionee: ____________________________

Optionee's Social Security Number: ____-___-_____

Number of Shares of Company Common Stock Covered by Option: _______

Exercise Price per Share: $__.____

Vesting Start Date: ___________ ___, 199__



           BY SIGNING THIS COVER SHEET, YOU AGREE TO ALL OF THE TERMS
          AND CONDITIONS DESCRIBED IN THE ATTACHMENT AND IN THE PLAN.




Optionee: _________________________________
                    (Signature)




Company: ______________________________________
                    (Signature)

            Title:  ___________________________




Attachment
<PAGE>   2


       1996 STOCK INCENTIVE PLAN OF BIOSITE DIAGNOSTICS INCORPORATED:

                      INCENTIVE STOCK OPTION AGREEMENT


INCENTIVE STOCK OPTION       This option is intended to be an incentive stock
                             option under section 422 of the Internal Revenue
                             Code and will be interpreted accordingly.

VESTING                      Your right to exercise this option shall become
                             exercisable on a daily basis over a four-year
                             period starting on the Vesting Start Date, as shown
                             on the cover sheet. Except as provided below, your
                             vested shares of Company Common Stock shall be
                             determined by multiplying your days of Service
                             since the Vesting Start Date by .000684931 and by
                             the number of shares of Company Common Stock
                             covered by this option, as shown on the cover
                             sheet.  The resulting number of shares will be
                             rounded to the nearest whole number.
                             Notwithstanding the foregoing, no part of this
                             option is exercisable until you have completed six
                             consecutive months of Service.  "Service" means
                             your service as an employee, director, consultant
                             or advisor of the Company or any affiliated
                             company.

                             No additional shares become exercisable after your
                             Company service has terminated for any reason.

TERM                         Your option will expire in any event at the close
                             of business at Company headquarters on the day
                             before the 10th anniversary of the Date of Option
                             Grant, as shown on the cover sheet.  (It will
                             expire earlier if your Service terminates, as
                             described below.)

REGULAR TERMINATION          If your Service terminates for any reason except
                             death or total and permanent disability, then your
                             option will expire at the close of business at
                             Company headquarters on the 90th day after your
                             termination date.

                             The Company determines when your service terminates
                             for this purpose.





                                        -2-
Initial Grant
<PAGE>   3
DEATH                        If you die while still in Service, then your
                             option will expire at the close of business at
                             Company headquarters on the date 12 months after
                             the date of death. During that 12-month period,
                             your estate, heirs or designated beneficiary may
                             exercise the vested portion of your option.


DISABILITY                   If your Service terminates because of your total
                             and permanent disability, then your option will
                             expire at the close of business at Company
                             headquarters on the date 12 months after your
                             termination date.  During that period, you may
                             exercise the vested portion of your option.

                             "Total and permanent disability" means that you are
                             unable to engage in any substantial gainful
                             activity by reason of any medically determinable
                             physical or mental impairment which can be expected
                             to result in death or which has lasted, or can be
                             expected to last, for a continuous period of not
                             less than one year.

LEAVES OF ABSENCE            For purposes of this option, Service does not
                             terminate when you go on a military leave, a sick
                             leave or another bona fide leave of absence, if the
                             leave was approved by the Company in writing.  But
                             Service will be treated as terminating 90 days
                             after you went on leave, unless your right to
                             return to active work is guaranteed by law or by a
                             contract.  Service terminates in any event when the
                             approved leave ends, unless you immediately return
                             to Service.

                             The Company determines which leaves count for this
                             purpose.

RESTRICTIONS ON              The Company will not permit you to exercise this
EXERCISE                     option if the issuance of shares at that time would
                             violate any law or regulation.

NOTICE OF EXERCISE           When you wish to exercise this option, you must
                             notify the Company by filing the proper "Notice of
                             Exercise" form at the address given on the form.
                             Your notice must specify how many shares you wish
                             to purchase.  Your notice must also specify how
                             your shares should be registered (in your name only
                             or in your and your spouse's names as community
                             property or as joint tenants with right of
                             survivorship). The notice will be effective when it
                             is received by the Company.


                                        -3-

<PAGE>   4

                             If someone else wants to exercise this option after
                             your death, that person must prove to the Company's
                             satisfaction that he or she is entitled to do so.


FORM OF PAYMENT              When you submit your notice of exercise, you must
                             include payment of the option price for the shares
                             you are purchasing. Payment may be made in one (or
                             a combination of two or more) of the following
                             forms:

                      o      Your personal check, a cashier's check or a money
                             order.
 
                      o      Certificates for Company stock that you have owned
                             for at least six months, along with any forms
                             needed to effect a transfer of the shares to the
                             Company.  The value of the shares, determined as of
                             the effective date of the option exercise, will be
                             applied to the option price.

                      o      Irrevocable directions to a securities broker
                             approved by the Company to sell your option shares
                             and to deliver all or a portion of the sale
                             proceeds to the Company in payment of the option
                             price. (The balance of the sale proceeds, if any,
                             will be delivered to you.)  The directions must be
                             given by signing a special "Notice of Exercise"
                             form provided by the Company.

WITHHOLDING TAXES            You will not be allowed to exercise this option
                             unless you make acceptable arrangements to pay any
                             withholding taxes that may be due as a result of
                             the option exercise.

RESTRICTIONS ON RESALE       By signing this Agreement, you agree not to sell
                             any option shares at a time when applicable laws or
                             Company policies prohibit a sale. This restriction
                             will apply as long as you are in the Service of the
                             Company.

TRANSFER OF OPTION           Prior to your death, only you may exercise this
                             option.  You cannot transfer or assign this option.
                             For instance, you may not sell this option or use
                             it as security for a loan.  If you attempt to do
                             any of these things, this option will immediately
                             become invalid. You may, however, dispose of this
                             option in your will.





                                        -4-

<PAGE>   5



RETENTION RIGHTS             Your option or this Agreement do not give you the
                             right to be retained by the Company (or any
                             subsidiaries) in any capacity. The Company (and any
                             subsidiaries) reserve the right to terminate your
                             service at any time, with or without cause.

STOCKHOLDER RIGHTS           You, or your estate or heirs, have no rights as a
                             stockholder of the Company until a certificate for
                             your option shares has been issued.  No adjustments
                             are made for dividends or other rights if the
                             applicable record date occurs before your stock
                             certificate is issued, except as described in the
                             Plan.


ADJUSTMENTS                  In the event of a stock split, a stock dividend or
                             a similar change in Company stock, the number of
                             shares covered by this option and the exercise
                             price per share may be adjusted pursuant to the
                             Plan.

APPLICABLE LAW               This Agreement will be interpreted and enforced
                             under the laws of the State of California.

THE PLAN AND OTHER           The text of the Plan is incorporated in this
AGREEMENTS                   Agreement by reference.  This Agreement and the
                             Plan constitute the entire understanding between
                             you and the Company regarding this option.  Any
                             prior agreements, commitments or negotiations
                             concerning this option are superseded.


BY SIGNING THE COVER SHEET OF THIS AGREEMENT, YOU AGREE TO ALL OF THE TERMS
AND CONDITIONS DESCRIBED ABOVE AND IN THE PLAN.





                                        -5-


<PAGE>   1





                                                                    Exhibit 10.4




         1996 STOCK INCENTIVE PLAN OF BIOSITE DIAGNOSTICS INCORPORATED:

                      NONSTATUTORY STOCK OPTION AGREEMENT


Biosite Diagnostics Incorporated, a Delaware corporation (the "Company"),
hereby grants an option to purchase shares of its common stock to the optionee
named below.  The terms and conditions of the option are set forth in this
cover sheet, in the attachment and in the 1996 Stock Incentive Plan of Biosite
Diagnostics Incorporated (the "Plan").



Date of Option Grant: ___________ ___, 199__

Name of Optionee: ____________________________

Optionee's Social Security Number: ____-___-_____

Number of Shares of Company Common Stock Covered by Option:

Exercise Price per Share: $__.____

Vesting Start Date: ___________ ___, 199__



           BY SIGNING THIS COVER SHEET, YOU AGREE TO ALL OF THE TERMS
          AND CONDITIONS DESCRIBED IN THE ATTACHMENT AND IN THE PLAN.




Optionee: _________________________________
                    (Signature)




Company: ______________________________________
                    (Signature)

            Title:  ___________________________



Attachment





<PAGE>   2


         1996 STOCK INCENTIVE PLAN OF BIOSITE DIAGNOSTICS INCORPORATED:

                      NONSTATUTORY STOCK OPTION AGREEMENT


NONSTATUTORY STOCK OPTION    This option is not intended to be
                             an incentive stock option under
                             section 422 of the Internal
                             Revenue Code.

VESTING                      Your right to exercise this option
                             shall become exercisable on a
                             daily basis over a four-year
                             period starting on the Vesting
                             Start Date, as shown on the cover
                             sheet.  Except as provided below,
                             your vested shares of Company
                             Common Stock shall be determined
                             by multiplying your days of
                             Service since the Vesting Start
                             Date by .000684931 and by the
                             number of shares of Company Common
                             Stock covered by this option, as
                             shown on the cover sheet.  The
                             resulting number of shares will be
                             rounded to the nearest whole
                             number.  Notwithstanding the
                             foregoing, no part of this option
                             is exercisable until you have
                             completed six consecutive months
                             of Service.  "Service" means your
                             service as an employee, director,
                             consultant or advisor of the
                             Company or any affiliated company.

                             No additional shares become
                             exercisable after your Company
                             service has terminated for any
                             reason.

TERM                         Your option will expire in any
                             event at the close of business at
                             Company headquarters on the day
                             before the 10th anniversary of the
                             Date of Option Grant, as shown on
                             the cover sheet.  (It will expire
                             earlier if your Service
                             terminates, as described below.)

REGULAR TERMINATION          If your Service terminates for any
                             reason except death or total and
                             permanent disability, then your
                             option will expire at the close of
                             business at Company headquarters
                             on the 90th day after your
                             termination date.

                             The Company determines when your
                             service terminates for this
                             purpose.





                                        -2-

<PAGE>   3



DEATH                        If you die while still in Service,
                             then your option will expire at
                             the close of business at Company
                             headquarters on the date 12 months
                             after the date of death.  During
                             that 12-month period, your estate,
                             heirs or designated beneficiary
                             may exercise the vested portion of
                             your option.

DISABILITY                   If your Service terminates because
                             of your total and permanent
                             disability, then your option will
                             expire at the close of business at
                             Company headquarters on the date
                             12 months after your termination
                             date.  During that 12-month
                             period, you may exercise the
                             vested portion of your option.

                             "Total and permanent disability"
                             means that you are unable to engage
                             in any substantial gainful activity
                             by reason of any medically
                             determinable physical or mental
                             impairment which can be expected
                             to result in death or which has
                             lasted, or can be expected to
                             last, for a continuous period of
                             not less than one year.

LEAVES OF ABSENCE            For purposes of this option,
                             Service does not terminate when
                             you go on a military leave, a sick
                             leave or another bona fide leave
                             of absence, if the leave was
                             approved by the Company in
                             writing.  But Service terminates
                             immediately when the approved
                             leave ends, unless you immediately
                             return to Service.  Service
                             terminates in any event when the
                             approved leave ends, unless you
                             immediately return to Service.

RESTRICTIONS ON EXERCISE     The Company will not permit you to
                             exercise this option if the
                             issuance of shares at that time
                             would violate any law or
                             regulation.

NOTICE OF EXERCISE           When you wish to exercise this
                             option, you must notify the
                             Company by filing the proper
                             "Notice of Exercise" form at the
                             address given on the form.  Your
                             notice must specify how many
                             shares you wish to purchase.  Your
                             notice must also specify how your
                             shares should be registered (in
                             your name only or in your and your
                             spouse's names as community
                             property or as joint tenants with
                             right of survivorship).  The
                             notice will be effective when it
                             is received by the Company.





                                        -3-

<PAGE>   4
                            If someone else wants to exercise
                            this option after your death, that
                            person must prove to the Company's
                            satisfaction that he or she is
                            entitled to do so.


FORM OF PAYMENT             When you submit your notice of
                            exercise, you must include payment
                            of the option price for the shares
                            you are purchasing.  Payment may
                            be made in one (or a combination
                            of two or more) of the following
                            forms:

                            o  Your personal check, a cashier's
                               check or a money order.

                            o  Certificates for Company stock
                               that you have owned for at
                               least six months, along with
                               any forms needed to effect a
                               transfer of the shares to the
                               Company.  The value of the
                               shares, determined as of the
                               effective date of the option
                               exercise, will be applied to
                               the option price.

                            o  Irrevocable directions to a
                               securities broker approved by
                               the Company to sell your
                               option shares and to deliver
                               all or a portion of the sale
                               proceeds to the Company in
                               payment of the option price.
                               (The balance of the sale
                               proceeds, if any, will be
                               delivered to you.)  The
                               directions must be given by
                               signing a special "Notice of
                               Exercise" form provided by
                               the Company.

WITHHOLDING TAXES           You will not be allowed to
                            exercise this option unless you
                            make acceptable arrangements to
                            pay any withholding taxes that may
                            be due as a result of the option
                            exercise.


RESTRICTIONS ON RESALE      By signing this Agreement, you
                            agree not to sell any option
                            shares at a time when applicable
                            laws or Company policies prohibit
                            a sale.  This restriction will
                            apply as long as you are in the
                            Service of the Company (or a
                            subsidiary).

TRANSFER OF OPTION          Prior to your death, only you may
                            exercise this option.  You cannot
                            transfer or assign this option.
                            For instance, you may not sell
                            this option or use it as security
                            for a loan.  If you attempt to do
                            any of these things, this option
                            will immediately become invalid.
                            You may, however, dispose of this
                            option in your will.





                                        -4-

<PAGE>   5



TRANSFER OF OPTION                      Prior to your death, only you may
                                        exercise this option.  You cannot
                                        transfer or assign this option.
                                        For instance, you may not sell
                                        this option or use it as security
                                        for a loan.  If you attempt to do
                                        any of these things, this option
                                        will immediately become invalid.
                                        You may, however, dispose of this
                                        option in your will.

RETENTION RIGHTS                        Your option or this Agreement do
                                        not give you the right to be
                                        retained by the Company (or any
                                        subsidiaries) in any capacity.
                                        The Company (and any subsidiaries)
                                        reserve the right to terminate
                                        your service at any time, with or
                                        without cause.

STOCKHOLDER RIGHTS                      You, or your estate or heirs, have
                                        no rights as a stockholder of the
                                        Company until a certificate for
                                        your option shares has been
                                        issued.  No adjustments are made
                                        for dividends or other rights if
                                        the applicable record date occurs
                                        before your stock certificate is
                                        issued, except as described in the
                                        Plan.

ADJUSTMENTS                             In the event of a stock split, a
                                        stock dividend or a similar change
                                        in Company stock, the number of
                                        shares covered by this option and
                                        the exercise price per share may
                                        be adjusted pursuant to the Plan.

APPLICABLE LAW                          This Agreement will be interpreted
                                        and enforced under the laws of the
                                        State of California.

THE PLAN AND OTHER AGREEMENTS           The text of the Plan is
                                        incorporated in this Agreement
                                        by reference.

                                        This Agreement and the Plan
                                        constitute the entire understanding
                                        between you and the Company
                                        regarding this option. Any
                                        prior agreements, commitments
                                        or negotiations concerning this
                                        option are superseded.


BY SIGNING THE COVER SHEET OF THIS AGREEMENT, YOU AGREE TO ALL OF THE TERMS AND
CONDITIONS DESCRIBED ABOVE AND IN THE PLAN.




                                        -5-


<PAGE>   1





                                                                    Exhibit 10.5



                        BIOSITE DIAGNOSTICS INCORPORATED

                          EMPLOYEE STOCK PURCHASE PLAN


SECTION 1.  PURPOSE OF THE PLAN.

         The Plan was adopted by the Company's Board of Directors on December
5, 1996.

         The purpose of the Plan is to provide Eligible Employees with an
opportunity to increase their proprietary interest in the success of the
Company by purchasing Stock from the Company on favorable terms and to pay for
such purchases through payroll deductions.  The Plan is intended to qualify
under section 423 of the Internal Revenue Code of 1986, as amended.

SECTION 2.  ADMINISTRATION OF THE PLAN.

         (a)  The Committee.  The Plan shall be administered by the Committee.
The interpretation and construction by the Committee of any provision of the
Plan or of any right to purchase Stock granted under the Plan shall be
conclusive and binding on all persons.

         (b)  Rules and Forms.  The Committee may adopt such rules and forms
under the Plan as it considers appropriate.

SECTION 3.  ENROLLMENT AND PARTICIPATION.

         (a)  Offering Periods.  While the Plan is in effect, two overlapping
Offering Periods shall commence in each calendar year.  Except for the first
Offering Period, Offering Periods shall consist of the 24-month periods
commencing on each January 1 and July 1.  The first Offering Period shall
commence on the effective date of the Company's initial public offering and end
on December 31, 1998.

         (b)  Accumulation Periods.  While the Plan is in effect, two
Accumulation Periods shall commence in each calendar year.  Except for the
first Accumulation Period, Accumulation Periods shall consist of the six-month
periods commencing on each January 1 and July 1.  The first Accumulation Period
shall commence on the effective date of the Company's initial public offering
and end on June 30, 1997.

         (c)  Enrollment.  Any individual who, on the day preceding the first
day of an Offering Period, qualifies as an Eligible Employee may elect to
become a Participant in the Plan for such Offering Period by executing the
enrollment form prescribed for this purpose by the Committee.  The enrollment
form shall be filed with the Company not later than one week
<PAGE>   2
prior to the last working day prior to the commencement of such Offering
Period.

         (d)  Duration of Participation.  Once enrolled in the Plan, a
Participant shall continue to participate until he or she ceases to be an
Eligible Employee, withdraws from the Plan or reaches the end of the
Accumulation Period in which he or she discontinued contributions.  A
Participant who discontinued contributions under Section 4(d) or withdrew from
the Plan under Section 5(a) may again become a Participant, if he or she then
is an Eligible Employee, by following the procedure described in Subsection (c)
above.

         (e)  Applicable Offering Period.  For purposes of calculating the
Purchase Price under Section 7(b), the applicable Offering Period shall be
determined as follows:

                 (i)  Once a Participant is enrolled in the Plan for an
         Offering Period, such Offering Period shall continue to apply to him
         or her until the earliest of (A) the end of such Offering Period, (B)
         the end of his or her participation under Subsection (d) above or (C)
         reenrollment in a subsequent Offering Period under Paragraph (ii)
         below.

                 (ii)  In the event that the Fair Market Value of Stock on the
         last trading day before the commencement of the Offering Period in
         which the Participant is enrolled is higher than on the last trading
         day before the commencement of any subsequent Offering Period, the
         Participant shall automatically be re-enrolled for such subsequent
         Offering Period.

                 (iii)  When a Participant reaches the end of an Offering
         Period but his or her participation is to continue, then such
         Participant shall automatically be re-enrolled for the Offering Period
         that commences immediately after the end of the prior Offering Period.

SECTION 4.  EMPLOYEE CONTRIBUTIONS.

         (a)  Frequency of Payroll Deductions.  A Participant may purchase
shares of Stock under the Plan solely by means of payroll deductions.  Payroll
deductions, as designated by the Participant pursuant to Subsection (b) below,
shall occur on each payday during participation in the Plan.

         (b)  Amount of Payroll Deductions.  An Eligible Employee shall
designate on the enrollment form the portion of his or her Compensation that he
or she elects to have withheld for the purchase of Stock.  Such portion shall
be a whole percentage of the Eligible Employee's Compensation, but not less
than 1% nor more than 15%.




                                       -2-
<PAGE>   3
         (c)  Changing Withholding Rate.  If a Participant wishes to change the
rate of payroll withholding, he or she may do so by filing a new enrollment
form with the Company not later than one week prior to the last working day
prior to the commencement of the Accumulation Period for which such change is
to be effective.

         (d)  Discontinuing Payroll Deductions.  If a Participant wishes to
discontinue employee contributions entirely, he or she may do so by filing a
new enrollment form at any time.  Payroll withholding shall cease as soon as
reasonably practicable after such form has been received by the Company.

SECTION 5.  WITHDRAWAL FROM THE PLAN.

         (a)  Withdrawal.  A Participant may elect to withdraw from the Plan by
filing the prescribed form with the Company at any time before the last day of
an Accumulation Period.  As soon as reasonably practicable thereafter, payroll
deductions shall cease and the entire amount credited to the Participant's Plan
Account shall be refunded to him or her in cash, without interest.  No partial
withdrawals shall be permitted.

         (b)  Re-Enrollment After Withdrawal.  A former Participant who has
withdrawn from the Plan shall not be a Participant until he or she re-enrolls
in the Plan under Section 3(b).

SECTION 6.  TERMINATION OF EMPLOYMENT OR DEATH.

         (a)  Termination of Employment.  Termination of employment as an
Eligible Employee for any reason, including death, shall be treated as an
automatic withdrawal from the Plan under Section 5(a).  (A transfer from one
Participating Company to another shall not be treated as a termination of
employment.)

         (b)  Death.  In the event of the Participant's death, the amount
credited to his or her Plan Account shall be paid to a beneficiary designated
by him or her for this purpose on the prescribed form or, if none, to the
Participant's estate.  Such form shall be valid only if it was filed with the
Company before the Participant's death.

SECTION 7.  PLAN ACCOUNTS AND PURCHASE OF SHARES.

         (a)  Plan Accounts.  The Company shall maintain a Plan Account on its
books in the name of each Participant.  Whenever an amount is deducted from the
Participant's Compensation under the Plan, such amount shall be credited to the
Participant's Plan Account.  No interest shall be credited to Plan Accounts.





                                      -3-



<PAGE>   4
         (b)  Purchase Price.  The Purchase Price for each share of Stock
purchased at the close of an Accumulation Period shall be the lower of:

                 (i)  85% of the Fair Market Value of such share on the last
         trading day before the commencement of the applicable Offering Period
         (as determined under Section 3(e)); or

                 (ii)  85% of the Fair Market Value of such share on the last
         trading day in such Accumulation Period.

         (c)  Number of Shares Purchased.  As of the last day of each
Accumulation Period, each Participant shall be deemed to have elected to
purchase the number of shares of Stock calculated in accordance with this
Subsection (c), unless the Participant has previously elected to withdraw from
the Plan in accordance with Section 5(a).  The amount then in the Participant's
Plan Account shall be divided by the Purchase Price, and the number of shares
that results shall be purchased from the Company with the funds in the
Participant's Plan Account.  The foregoing notwithstanding, no Participant
shall purchase more than a maximum of 2,500 shares of Stock with respect to any
Accumulation Period nor shares of Stock in excess of the amounts set forth in
Sections 8 and 12(a).  The Committee may determine with respect to all
Participants that any fractional share, as calculated under this Subsection
(c), shall be rounded down to the next lower whole share.

         (d)  Available Shares Insufficient.  In the event that the aggregate
number of shares that all Participants elect to purchase during an Accumulation
Period exceeds the maximum number of shares remaining available for issuance
under Section 12(a), then the number of shares to which each Participant is
entitled shall be determined by multiplying the number of shares available for
issuance by a fraction, the numerator of which is the number of shares that
such Participant has elected to purchase and the denominator of which is the
number of shares that all Participants have elected to purchase.

         (e)  Issuance of Stock.  Certificates representing the shares of Stock
purchased by a Participant under the Plan shall be issued to him or her as soon
as reasonably practicable after the close of the applicable Accumulation
Period, except that the Committee may determine that such shares shall be held
for each Participant's benefit by a broker designated by the Committee (unless
the Participant has elected that certificates be issued to him or her).  Shares
may be registered in the name of the Participant or jointly in the name of the
Participant and his or her spouse as joint tenants with right of survivorship
or as community property.





                                      -4-



<PAGE>   5
         (f)  Unused Cash Balances.  An amount remaining in the Participant's
Plan Account that represents the Purchase Price for any fractional share shall
be carried over in the Participant's Plan Account to the next Accumulation
Period.  Any amount remaining in the Participant's Plan Account that represents
the Purchase Price for whole shares that could not be purchased by reason of
Subsection (c) above or Section 12(a) shall be refunded to the Participant in
cash, without interest.

         (g)     Failure of Shareholders to Approve Plan.

         In the event shareholders of the Company do not approve this Plan, the
Participant's Plan Account shall be repaid to the Participant in cash and no
Company shares will be purchased for the Participant under this Plan.

SECTION 8.  LIMITATIONS ON STOCK OWNERSHIP.

         Any other provision of the Plan notwithstanding, no Participant shall
be granted a right to purchase Stock under the Plan if:

                 (a)  Such Participant, immediately after his or her election
         to purchase such Stock, would own stock possessing more than 5% of the
         total combined voting power or value of all classes of stock of the
         Company or any parent or Subsidiary of the Company; or

                 (b)  Under the terms of the Plan, such Participant's rights to
         purchase stock under this and all other qualified employee stock
         purchase plans of the Company or any parent or Subsidiary of the
         Company would accrue at a rate that exceeds $25,000 of the fair market
         value of such stock (determined at the time when such right is
         granted) for each calendar year for which such right or option is
         outstanding at any time.

Ownership of stock shall be determined after applying the attribution rules of
section 424(d) of the Internal Revenue Code of 1986, as amended.  For purposes
of this Section 8, each Participant shall be considered to own any stock that
he or she has a right or option to purchase under this or any other plan, and
each Participant shall be considered to have the right to purchase 2,500 shares
of Stock under this Plan with respect to each Accumulation Period.

SECTION 9.  RIGHTS NOT TRANSFERABLE.

         The rights of any Participant under the Plan, or any Participant's
interest in any Stock or moneys to which he or she may be entitled under the
Plan, shall not be transferable by voluntary or involuntary assignment or by
operation of law, or in any other manner other than by beneficiary designation





                                      -5-



<PAGE>   6
or the laws of descent and distribution.  If a Participant in any manner
attempts to transfer, assign or otherwise encumber his or her rights or
interest under the Plan, other than by beneficiary designation or the laws of
descent and distribution, then such act shall be treated as an election by the
Participant to withdraw from the Plan under Section 5(a).

SECTION 10.  NO RIGHTS AS AN EMPLOYEE.

         Nothing in the Plan shall be construed to give any person the right to
remain in the employ of a Participating Company.  Each Participating Company
reserves the right to terminate the employment of any person at any time, with
or without cause.

SECTION 11.  NO RIGHTS AS A STOCKHOLDER.

         A Participant shall have no rights as a stockholder with respect to
any shares that he or she has purchased, or may have a right to purchase, under
the Plan until the date of issuance of a stock certificate for such shares.

SECTION 12.  STOCK OFFERED UNDER THE PLAN.

         (a)  Authorized Shares.  The aggregate number of shares of Stock
available for purchase under the Plan shall be 100,000, subject to adjustment
pursuant to this Section 12.

         (b)  Anti-Dilution Adjustments.  The aggregate number of shares of
Stock offered under the Plan, the 2,500-share limitation described in Section
7(c) and the price of shares that any Participant has elected to purchase shall
be adjusted proportionately by the Committee for any increase or decrease in
the number of outstanding shares of Stock resulting from a subdivision or
consolidation of shares, the payment of a stock dividend, any other increase or
decrease in such shares effected without receipt or payment of consideration by
the Company or the distribution of the shares of a Subsidiary to the Company's
stockholders.

         (c)  Reorganizations.  In the event of a dissolution or liquidation of
the Company, or a merger or consolidation to which the Company is a constituent
corporation, the Plan shall terminate unless the plan of merger, consolidation
or reorganization provides otherwise, and all amounts that have been withheld
but not yet applied to purchase Stock hereunder shall be refunded, without
interest.  The Plan shall in no event be construed to restrict in any way the
Company's right to undertake a dissolution, liquidation, merger, consolidation
or other reorganization.

SECTION 13.  AMENDMENT OR DISCONTINUANCE.

         The Board of Directors shall have the right to amend, suspend or
terminate the Plan at any time and without notice.





                                      -6-



<PAGE>   7
Except as provided in Section 12, any increase in the aggregate number of
shares of Stock to be issued under the Plan shall be subject to approval by a
vote of the stockholders of the Company.  In addition, any other amendment of
the Plan shall be subject to approval by a vote of the stockholders of the
Company to the extent required by an applicable law or regulation.

SECTION 14.  DEFINITIONS.

         (a)  "Accumulation Period" means a six-month period during which
contributions may be made toward the purchase of Stock under the Plan, as
determined pursuant to Section 3(b).

         (b)  "Board of Directors" means the Board of Directors of the Company,
as constituted from time to time.

         (c)  "Committee" means a committee of the Board of Directors,
consisting of one or more directors appointed by the Board of Directors.

         (d)  "Company" means Biosite Diagnostics Incorporated, a Delaware
corporation.

         (e)  "Compensation" means the total compensation paid in cash to a
Participant by a Participating Company, including salaries, wages, overtime pay
and commissions, but excluding bonuses, incentive compensation, moving or
relocation allowances, car allowances, imputed income attributable to cars or
life insurance, taxable fringe benefits and similar items, all as determined by
the Committee.

         (f)  "Eligible Employee" means any employee of a Participating
Company:

                 (i)  Whose customary employment is for more than five months
         per calendar year and for more than 20 hours per week; and

                 (ii)  Who has been an employee of a Participating Company for
         not less than one month.

         (g)  "Fair Market Value" shall mean the market price of Stock,
determined by the Committee as follows:

                 (i)  If Stock was traded over-the-counter on the date in
         question but was not traded on the Nasdaq Stock Market or the Nasdaq
         National Market, then the Fair Market Value shall be equal to the mean
         between the last reported representative bid and asked prices quoted
         for such date by the principal automated inter-dealer quotation system
         on which Stock is quoted or, if the Stock is not quoted on any such
         system, by the "Pink Sheets" published by the National Quotation
         Bureau, Inc.;





                                      -7-



<PAGE>   8
                 (ii)  If Stock was traded over-the-counter on the date in
         question and was traded on the Nasdaq Stock Market or the Nasdaq
         National Market, then the Fair Market Value shall be equal to the
         last-transaction price quoted for such date by the Nasdaq Stock Market
         or the Nasdaq National Market;

                 (iii)  If the Stock was traded on a stock exchange on the date
         in question, then the Fair Market Value shall be equal to the closing
         price reported by the applicable composite transactions report for
         such date; and

                 (iv)  If none of the foregoing provisions is applicable, then
         the Fair Market Value shall be determined by the Committee in good
         faith on such basis as it deems appropriate.

Whenever possible, the determination of Fair Market Value by the Committee
shall be based on the prices reported in the Western Edition of The Wall Street
Journal or as reported directly to the Company by Nasdaq or a comparable
exchange.  Such determination shall be conclusive and binding on all persons.

         (h)  "Offering Period" means a 24-month period with respect to which
the right to purchase Stock may be granted under the Plan, as determined
pursuant to Section 3(a).

         (i)  "Participant" means an Eligible Employee who elects to
participate in the Plan, as provided in Section 3(c).

         (j)  "Participating Company" means the Company and each present or
future Subsidiary, except Subsidiaries excluded by the Committee.

         (k)  "Plan" means this Biosite Diagnostics Incorporated Employee Stock
Purchase Plan, as amended from time to time.

         (l)  "Plan Account" means the account established for each Participant
pursuant to Section 6(a).

         (m)  "Purchase Price" means the price at which Participants may
purchase Stock under the Plan, as determined pursuant to Section 7(b).

         (n)  "Stock" means the Common Stock of the Company.

         (o)  "Subsidiary" means a corporation, 50% or more of the total
combined voting power of all classes of stock of which is owned by the Company
or by another Subsidiary.





                                      -8-



<PAGE>   9
SECTION 15.  EXECUTION.

         To record the adoption of the Plan by the Board of Directors, the
Company has caused its duly authorized officer to affix the corporate name and
seal hereto.


                                       BIOSITE DIAGNOSTICS INCORPORATED

[SEAL]


                                       By: /s/ Kim D. Blickenstaff
                                           -----------------------




                                      -9-




<PAGE>   1





                                                                    Exhibit 10.6




                              INDEMNITY AGREEMENT


         THIS INDEMNITY AGREEMENT, dated as of ______ ___, 199_, between
Biosite Diagnostics Incorporated, a Delaware corporation (the "Corporation"),
and ______________ (the "Indemnitee"),

                              W I T N E S S E T H:

         WHEREAS, Indemnitee is a member of the board of directors of the
Corporation (the "Board of Directors") or is an officer of the Corporation, and
in such capacity is performing a valuable service for the Corporation; and

         WHEREAS, Indemnitee is willing to serve, continue to serve, and take
on additional service for or on behalf of the Corporation on the condition that
he or she be indemnified as herein provided; and

         WHEREAS, it is intended that Indemnitee shall be paid promptly by the
Corporation all amounts necessary to effectuate in full the indemnity provided
herein:

         NOW THEREFORE, in consideration of the premises and the covenants in
this Agreement, and intending to be legally bound hereby, the parties hereto
agree as follows:

         1.      Services by Indemnitee.  Indemnitee agrees to serve as a
director or officer of the Corporation so long as he or she is duly appointed
or elected and qualified in accordance with the applicable provisions of the
Restated Certificate of Incorporation and Bylaws of the Corporation or any
subsidiary of the Corporation and until such time as he or she resigns or fails
to stand for election or is removed from his or her position.  Indemnitee may
at any time and for any reason resign or be removed from such position (subject
to any other contractual obligation or other obligation imposed by operation of
law), in which event the Corporation shall have no obligation under this
Agreement to continue Indemnitee in any such position.

         2.      Indemnification.

         (a)     The Corporation shall indemnify Indemnitee against Expenses
and Liabilities in connection with any Proceeding arising out of acts or
omissions of Indemnitee occurring during Indemnitee's service as a director or
as an officer of the Corporation to the fullest extent permitted by applicable
law or the Restated Certificate of Incorporation of the Corporation in effect
on the date hereof or as such law or Restated Certificate of Incorporation may
from time to time be amended (but, in the case of any such amendment, only to
the extent such amendment permits the Corporation to provide broader
indemnification
<PAGE>   2
rights than the law or Restated Certificate of Incorporation permitted the
Corporation to provide before such amendment).  The right to indemnification
provided in the Restated Certificate of Incorporation shall be presumed to have
been relied upon by Indemnitee in serving or continuing to serve the
Corporation and shall be enforceable as a contract right.  Without diminishing
the scope of the indemnification provided by this Section 2, the Corporation
shall indemnify Indemnitee whenever he or she is or was a party or is
threatened to be made a party to any Proceeding, including without limitation
any such Proceeding brought by or in the right of the Corporation, because he
or she is or was a director or officer of the Corporation or because of
anything done or not done by Indemnitee in such capacity, against Expenses and
Liabilities actually and reasonably incurred by Indemnitee or on his or her
behalf in connection with such Proceeding, including the costs of any
investigation, defense, settlement or appeal, except that no indemnification
shall be made with respect to any claim, issue or matter if Indemnitee was
finally adjudged to be liable to the Corporation by a court of competent
jurisdiction due to his or her gross negligence or willful misconduct unless
and to the extent that a Delaware Court of Chancery or the court in which the
action was heard determines that Indemnitee is entitled to indemnification for
such amounts as the court deems proper.  In addition to, and not as a
limitation of, the foregoing, the rights of indemnification of Indemnitee
provided under this Agreement shall include those rights set forth in Sections
3, 7, 8 and 13 below.

         (b)     Indemnitee shall be paid promptly by the Corporation all
amounts necessary to effectuate the foregoing indemnity.

         3.      Advancement of Expenses.  All reasonable Expenses incurred by
or on behalf of Indemnitee shall be advanced from time to time by the
Corporation to Indemnitee within thirty (30) days after the Corporation's
receipt of a written request for an advance of Expenses, whether prior to or
after final disposition of a Proceeding (except to the extent that there has
been a Final Adverse Determination that Indemnitee is not entitled to be
indemnified for such Expenses), including without limitation any Proceeding
brought by or in the right of the Corporation.  The written request for an
advancement of any and all Expenses under this paragraph shall contain
reasonable detail of the Expenses incurred by Indemnitee.  If required by law
at the time of such advance, Indemnitee hereby agrees to repay the amounts
advanced if it is ultimately determined that Indemnitee is not entitled to be
indemnified pursuant to the terms of this Agreement.

         4.      Limitations.  The foregoing indemnity and advancement of
Expenses shall apply only to the extent that Indemnitee has not been
indemnified and reimbursed pursuant to such insurance as the Corporation may
maintain for Indemnitee's benefit, or




                                       -2-
<PAGE>   3
otherwise; provided, however, that notwithstanding the availability of such
other indemnification and reimbursement, Indemnitee may claim indemnification
and advancement of Expenses pursuant to this Agreement by assigning to the
Corporation, at its request, Indemnitee's claims under such insurance to the
extent Indemnitee has been paid by the Corporation.

         5.      Insurance and Funding.  The Corporation may purchase and
maintain insurance to protect itself and/or Indemnitee against any Expenses and
Liabilities in connection with any Proceeding to the fullest extent permitted
by applicable laws.  The Corporation may create a trust fund, grant an interest
or use other means (including, without limitation, a letter of credit) to
ensure the payment of such amounts as may be necessary to effect
indemnification or advancement of Expenses as provided in this Agreement.

         6.  Procedure for Determination of Entitlement to Indemnification.

         (a)     Whenever Indemnitee believes that he or she is entitled to
indemnification pursuant to this Agreement, Indemnitee shall submit a written
request for indemnification to the Corporation.  Any request for
indemnification shall include sufficient documentation or information
reasonably available to Indemnitee to support his or her claim for
indemnification.  Indemnitee shall submit such claim for indemnification within
a reasonable time not to exceed five years after any judgment, order,
settlement, dismissal, arbitration award, conviction, acceptance of a plea of
nolo contendere or its equivalent, final termination or other disposition or
partial disposition of any Proceeding, whichever is the later date for which
Indemnitee requests indemnification.  The President or the Secretary or other
appropriate officer shall, promptly upon receipt of Indemnitee's request for
indemnification, advise the Board of Directors in writing that Indemnitee has
made such request.  Determination of Indemnitee's entitlement to
indemnification shall be made not later than ninety (90) days after the
Corporation's receipt of his or her written request for such indemnification.

         (b)     The Indemnitee shall be entitled to select the forum in which
Indemnitee's request for indemnification will be heard, which selection shall
be included in the written request for indemnification required in Section
6(a).  The forum shall be any one of the following:

                 (i)    The stockholders of the Corporation;

                 (ii)   A quorum of the Board of Directors consisting of
         Disinterested Directors;





                                      -3-

<PAGE>   4
                 (iii)  Independent Legal Counsel, who shall make the
         determination in a written opinion; or

                 (iv)   A panel of three arbitrators, one selected by the
         Corporation, another by Indemnitee and the third by the first two
         arbitrators selected.  If for any reason three arbitrators are not
         selected within thirty (30) days after the appointment of the first
         arbitrator, then selection of additional arbitrators shall be made by
         the American Arbitration Association.  If any arbitrator resigns or is
         unable to serve in such capacity for any reason, the American
         Arbitration Association shall select such arbitrator's replacement.
         The arbitration shall be conducted pursuant to the commercial
         arbitration rules of the American Arbitration Association now in
         effect.

         If Indemnitee fails to make such designation, his or her claim shall
be determined by an appropriate court of the State of Delaware.

         7.  Fees and Expenses of Independent Legal Counsel.  The Corporation
agrees to pay the reasonable fees and expenses of Independent Legal Counsel or
a panel of three arbitrators should such Counsel or such panel of arbitrators
be retained to make a determination of Indemnitee's entitlement to
indemnification pursuant to Section 6 of this Agreement, and to fully indemnify
such Counsel or arbitrators against any and all expenses and losses incurred by
any of them arising out of or relating to this Agreement or their engagement
pursuant hereto.

         8.      Remedies of Indemnitee.

         (a)     In the event that (i) a determination pursuant to Section 6
hereof is made that Indemnitee is not entitled to indemnification, (ii)
advances of Expenses are not made pursuant to this Agreement, (iii) payment has
not been timely made following a determination of entitlement to
indemnification pursuant to this Agreement, or (iv) Indemnitee otherwise seeks
enforcement of this Agreement, Indemnitee shall be entitled to a final
adjudication in an appropriate court of the State of Delaware of his or her
rights.  The Corporation shall not oppose Indemnitee's right to seek any such
adjudication.

         (b)     In the event that a determination that Indemnitee is not
entitled to indemnification, in whole or in part, has been made pursuant to
Section 6 hereof, the decision in the judicial proceeding provided in paragraph
(a) of this Section 8 shall be made de novo and Indemnitee shall not be
prejudiced by reason of a determination that he or she is not entitled to
indemnification.





                                      -4-

<PAGE>   5
         (c)     If a determination that Indemnitee is entitled to
indemnification has been made pursuant to Section 6 hereof or otherwise
pursuant to the terms of this Agreement, the Corporation shall be bound by such
determination in the absence of (i) a misrepresentation or omission of a
material fact by Indemnitee or (ii) a specific finding (which has become final)
by an appropriate court of the State of Delaware that all or any part of such
indemnification is expressly prohibited by law.

         (d)     In any court proceeding pursuant to this Section 8, the
Corporation shall be precluded from asserting that the procedures and
presumptions of this Agreement are not valid, binding and enforceable.  The
Corporation shall stipulate in any such court that the Corporation is bound by
all the provisions of this Agreement and is precluded from making any assertion
to the contrary.

         (e)     Expenses reasonably incurred by Indemnitee in connection with
his or her request for indemnification under this Agreement, seeking
enforcement of this Agreement or to recover damages for breach of this
Agreement shall be borne by the Corporation.

         9.  Modification, Waiver, Termination and Cancellation.  No
supplement, modification, termination, cancellation or amendment of this
Agreement shall be binding unless executed in writing by both of the parties
hereto.  No waiver of any of the provisions of this Agreement shall be deemed
or shall constitute a waiver of any other provisions hereof (whether or not
similar), nor shall such waiver constitute a continuing waiver.

         10.     Subrogation.  In the event of payment under this Agreement,
the Corporation shall be subrogated to the extent of such payment to all of the
rights of recovery of Indemnitee, who shall execute all papers required and
shall do everything that may be necessary to secure such rights, including the
execution of such documents necessary to enable the Corporation effectively to
bring suit to enforce such rights.

         11.  Notice by Indemnitee and Defense of Claim.  Indemnitee shall
promptly notify the Corporation in writing upon being served with any summons,
citation, subpoena, complaint, indictment, information or other document
relating to any matter, whether civil, criminal, administrative or
investigative, but the omission so to notify the Corporation will not relieve
it from any liability which it may have to Indemnitee if such omission does not
prejudice the Corporation's rights.  If such omission does prejudice the
Corporation's rights, the Corporation will be relieved from liability only to
the extent of such prejudice; nor will such omission relieve the Corporation
from any liability which it may have to Indemnitee otherwise than under this
Agreement.  With respect to any





                                      -5-

<PAGE>   6
Proceeding as to which Indemnitee notifies the Corporation of the commencement
thereof:

         (a)     The Corporation will be entitled to participate therein at its
own expense; and

         (b)     The Corporation jointly with any other indemnifying party
similarly notified will be entitled to assume the defense thereof, with counsel
reasonably satisfactory to Indemnitee; provided, however, that the Corporation
shall not be entitled to assume the defense of any Proceeding if Indemnitee
shall have reasonably concluded that there may be a conflict of interest
between the Corporation and Indemnitee with respect to such Proceeding.  After
notice from the Corporation to Indemnitee of its election to assume the defense
thereof, the Corporation will not be liable to Indemnitee under this Agreement
for any Expenses subsequently incurred by Indemnitee in connection with the
defense thereof, other than reasonable costs of investigation or as otherwise
provided below.  Indemnitee shall have the right to employ his or her own
counsel in such Proceeding but the fees and expenses of such counsel incurred
after notice from the Corporation of its assumption of the defense thereof
shall be at the expense of Indemnitee unless:

                 (i)        The employment of counsel by Indemnitee has been
         authorized by the Corporation;

                 (ii)   Indemnitee shall have reasonably concluded that counsel
         engaged by the Corporation may not adequately represent Indemnitee; or

                 (iii)  The Corporation shall not in fact have employed counsel
         to assume the defense in such Proceeding or shall not in fact have
         assumed such defense and be acting in connection therewith with
         reasonable diligence;

in each of which cases the fees and expenses of such counsel shall be at the
expense of the Corporation.

         (c)     The Corporation shall not settle any Proceeding in any manner
which would impose any penalty or limitation on Indemnitee without Indemnitee's
written consent; provided, however, that Indemnitee will not unreasonably
withhold his or her consent to any proposed settlement.

         12.  Notices.  All notices, requests, demands and other communications
hereunder shall be in writing and shall be deemed to have been duly given if
(i) delivered by hand and receipted for by the party to whom said notice or
other communication shall have been directed, or (ii) mailed by certified or
registered mail with postage prepaid, on the third business day after the date
on which it is so mailed:





                                      -6-

<PAGE>   7
         (a)     If to Indemnitee, to:

                 ----------------------------

                 ----------------------------

                 ----------------------------

                 ----------------------------

         (b)     If to the Corporation, to:

                 Biosite Diagnostics Incorporated
                 11030 Roselle Street
                 San Diego, California 92121
                 Attention: President

or to such other address as may have been furnished to Indemnitee by the
Corporation or to the Corporation by Indemnitee, as the case may be.

         13.     Nonexclusivity.  The rights of Indemnitee hereunder shall not
be deemed exclusive of any other rights to which Indemnitee may now or in the
future be entitled under the Delaware General Corporation Law, the
Corporation's Restated Certificate of Incorporation or Bylaws, or any
agreements, vote of stockholders, resolution of the Board of Directors or
otherwise.

         14.     Certain Definitions.

         (a)     "Disinterested Director" shall mean a director of the
Corporation who is not or was not a party to the Proceeding in respect of which
indemnification is being sought by Indemnitee.

         (b)     "Expenses" shall include all direct and indirect costs
(including, without limitation, attorneys' fees, retainers, court costs,
transcripts, fees of experts, witness fees, travel expenses, duplicating costs,
printing and binding costs, telephone charges, postage, delivery service fees,
all other disbursements or out-of-pocket expenses and reasonable compensation
for time spent by Indemnitee for which he or she is otherwise not compensated
by the Corporation) actually and reasonably incurred in connection with a
Proceeding or establishing or enforcing a right to indemnification under this
Agreement, applicable law or otherwise; provided, however, that "Expenses"
shall not include any Liabilities.

         (c)     "Final Adverse Determination" shall mean that a determination
that Indemnitee is not entitled to indemnification shall have been made
pursuant to Section 6 hereof and either (1) a final adjudication in a Delaware
court pursuant to  Section 8(a) hereof shall have denied Indemnitee's right to
indemnification hereunder, or (2) Indemnitee shall have failed to file a
complaint in a Delaware court pursuant to Section 8(a)





                                      -7-

<PAGE>   8
for a period of one hundred twenty (120) days after the determination made
pursuant to Section 6 hereof.

         (d)     "Indemnification Period" shall mean the period of time during
which Indemnitee shall continue to serve as a director or as an officer of the
Corporation, and thereafter so long as Indemnitee shall be subject to any
possible Proceeding arising out of acts or omissions of Indemnitee as a
director or as an officer of the Corporation.

         (e)     "Independent Legal Counsel" shall mean a law firm or a member
of a law firm selected by the Corporation and approved by Indemnitee (which
approval shall not be unreasonably withheld) and that neither is presently nor
in the past five (5) years has been retained to represent:  (i) the
Corporation, in any material matter, or (ii) any other party to the Proceeding
giving rise to a claim for indemnification hereunder.  Notwithstanding the
foregoing, the term "Independent Legal Counsel" shall not include any person
who, under the applicable standards of professional conduct then prevailing,
would have a conflict of interest in representing either the Corporation or
Indemnitee in an action to determine Indemnitee's right to indemnification
under this Agreement.

         (f)     "Liabilities" shall mean liabilities of any type whatsoever
including, but not limited to, any judgments, fines, ERISA excise taxes and
penalties, penalties and amounts paid in settlement (including all interest
assessments and other charges paid or payable in connection with or in respect
of such judgments, fines, penalties or amounts paid in settlement) of any
proceeding.

         (g)     "Proceeding" shall mean any threatened, pending or completed
action, claim, suit, arbitration, alternate dispute resolution mechanism,
investigation, administrative hearing or any other proceeding whether civil,
criminal, administrative or investigative, including any appeal therefrom.

         15.  Binding Effect, Duration and Scope of Agreement.  This Agreement
shall be binding upon and inure to the benefit of and be enforceable by the
parties hereto and their respective successors and assigns (including any
direct or indirect successor by purchase, merger, consolidation or otherwise to
all or substantially all of the business or assets of the Corporation),
spouses, heirs and personal and legal representatives.  This Agreement shall
continue in effect during the Indemnification Period, regardless of whether
Indemnitee continues to serve as a director or as an officer.

         16.     Severability.  If any provision or provisions of this
Agreement (or any portion thereof) shall be held to be invalid, illegal or
unenforceable for any reason whatsoever:





                                      -8-

<PAGE>   9
         (a)     the validity, legality and enforceability of the remaining
provisions of this Agreement shall not in any way be affected or impaired
thereby; and

         (b)     to the fullest extent legally possible, the provisions of this
Agreement shall be construed so as to give effect to the intent of any
provision held invalid, illegal or unenforceable.

         17.  Governing Law and Interpretation of Agreement.  This Agreement
shall be governed by and construed and enforced in accordance with the laws of
the State of Delaware, as applied to contracts between Delaware residents
entered into and to be performed entirely within Delaware.  If the laws of the
State of Delaware are hereafter amended to permit the Corporation to provide
broader indemnification rights than said laws permitted the Corporation to
provide prior to such amendment, the rights of indemnification and advancement
of expenses conferred by this Agreement shall automatically be broadened to the
fullest extent permitted by the laws of the State of Delaware, as so amended.

         18.     Consent to Jurisdiction.  The Corporation and Indemnitee each
irrevocably consent to the jurisdiction of the courts of the State of Delaware
for all purposes in connection with any action or proceeding which arises out
of or relates to this Agreement and agree that any action instituted under this
Agreement shall be brought only in the state courts of the State of Delaware.

         19.     Entire Agreement.  This Agreement represents the entire
agreement between the parties hereto, and there are no other agreements,
contracts or understandings between the parties hereto with respect to the
subject matter of this Agreement, except as specifically referred to herein or
as provided in Section 13 hereof.

         20.     Counterparts.  This Agreement may be executed in one or more
counterparts, each of which shall for all purposes be deemed to be an original
but all of which together shall constitute one and the same Agreement.


                                       BIOSITE DIAGNOSTICS INCORPORATED


                                       By: __________________________
                                       
                                       Its:  ________________________


                                        ______________________________





                                      -9-


<PAGE>   1





                                                                   Exhibit 10.17





                            STOCK PURCHASE AGREEMENT


                 THIS STOCK PURCHASE AGREEMENT (the "Agreement") is made as of
the 30th day of October, 1991 by and between BIOSITE DIAGNOSTICS INCORPORATED,
a Delaware corporation (the "Company"), and the investors listed on Schedule A
hereto, each of which is herein referred to as an "Investor."

                 THE PARTIES HEREBY AGREE AS FOLLOWS:

                 1.  Purchase and Sale of Stock.

                 1.1  Sale and Issuance of Series D Preferred Stock.

                 (a)  The Company shall adopt and file with the Secretary of
State of the State of Delaware on or before the first Closing (as defined
below) the Restated Certificate of Incorporation in the form attached hereto as
Exhibit A (the "Restated Certificate").

                 (b)  Subject to the terms and conditions of this Agreement,
each Investor agrees, severally, to purchase at the Closing and the Company
agrees to sell and issue to each Investor at the Closing that number of shares
of the Company's Series D Preferred Stock set forth opposite such Investor's
name on Schedule A hereto for the purchase price of $3.00 per share.

                 (c)      The Company may sell authorized but unissued shares
of Series D Preferred Stock not sold at the Closing referred to in Section 1.2
below at one or more additional closings to any purchaser who makes the
representations set forth in Section 3.8 hereof at a price of $3.00 per share,
provided that the agreements with respect to such sales are executed not later
than December 29, 1991 and provided further that the terms and conditions in
such agreement are no more favorable to such purchaser than those contained in
this Agreement.  Any such purchaser shall be deemed to be an Investor for
purposes of this Agreement, and the shares so sold shall be deemed to have been
acquired hereunder.

                 1.2  Closing.  A purchase and sale of the Series D Preferred
Stock shall take place at the offices of Pillsbury Madison & Sutro, 235
Montgomery Street, San Francisco, California, at 10:00 A.M., on October 30,
1991 or at such other time and place as the Company and Investors acquiring in
the aggregate more than half the shares of Series D Preferred Stock sold at
such time and place pursuant hereto mutually agree upon (verbally or in
writing) (which time and place are designated as the "Closing").  At the
Closing the Company shall deliver to each Investor a certificate representing
the Series D Preferred Stock which such Investor is purchasing against delivery
to the




                                       -1-
<PAGE>   2
Company by such Investor of a bank check or bank wire in the amount of the
purchase price therefor payable to the Company's order or by delivery of
evidences of indebtedness of the Company for cancellation by the Company.

                 2.  Representations and Warranties of the Company.  The
Company hereby represents and warrants to each Investor that, except as set
forth on the Schedule of Exceptions furnished to each Investor and specifically
identifying the relevant subparagraph hereof, which exceptions shall be deemed
to be representations and warranties as if made hereunder:

                 2.1  Organization, Good Standing and Qualification.  The
Company is a corporation duly organized, validly existing and in good standing
under the laws of the State of Delaware and has all requisite corporate power
and authority to carry on its business as now conducted and as proposed to be
conducted.  The Company is duly qualified to transact business and is in good
standing in each jurisdiction in which the failure to so qualify would have a
material adverse effect on its business or properties.

                 2.2  Capitalization.  The authorized capital of the Company
consists, or will consist prior to the Closing, of:

                 (i)  Preferred Stock.  6,970,503 shares of preferred stock
         (the "Preferred Stock"), 610,000 shares of which have been designated
         Series A Preferred Stock, par value $.01 per share (the "Series A
         Preferred Stock"), 2,156,336 shares of which have been designated
         Series B Preferred Stock, par value $.01 per share (the "Series B
         Preferred Stock"), 2,204,167 shares of which have been designated
         Series C Preferred Stock, par value $.01 per share (the "Series C
         Preferred Stock") and 2,000,000 shares of which have been designated
         Series D Preferred Stock, par value $.01 per share (the "Series D
         Preferred Stock").  There are 610,000 shares of Series A Preferred
         Stock, 2,156,336 shares of Series B Preferred Stock and 2,204,167
         shares of Series C Preferred Stock issued and outstanding and, based
         upon the Company's records, such outstanding shares of Series A
         Preferred Stock, Series B Preferred Stock and Series C Preferred Stock
         are owned by the persons and in the numbers specified in the
         stockholder list provided supplementally to special counsel to the
         Investors.  The rights, preferences and privileges of the Series A
         Preferred Stock, Series B Preferred Stock, Series C Preferred Stock
         and Series D Preferred Stock are or as of the Closing will be as
         stated in the Company's Restated Certificate.

                 (ii)  Common Stock.  12,000,000 shares of common stock (the
         "Common Stock"), of which 1,134,397 shares





                                      -2-
<PAGE>   3
         are issued and outstanding and, based upon the Company's records, are
         owned by the persons, and in the numbers specified in the stockholder
         list provided supplementally to special counsel to the Investors.

                 (iii)  Agreements for Purchase of Shares.  Except for (a) the
         conversion privileges of the Series A Preferred Stock, the Series B
         Preferred Stock, the Series C Preferred Stock and the Series D
         Preferred Stock, (b) the right of first offer of the Investors
         provided in Section 8.4 hereof, (c) the right of first offer provided
         for in Section 8.4 of the Series A Preferred Stock Purchase Agreement
         dated as of May 5, 1988 between the Company and the investors listed
         therein (the "Series A Agreement"), (d) the right of first offer
         provided for in Section 8.4 of the Series B Preferred Stock Purchase
         Agreement dated as of July 24, 1989 between the Company and the
         investors listed therein (the "Series B Agreement"), (e) the right of
         first offer provided for in Section 8.4 of the Series C Preferred
         Stock Purchase Agreement dated as of June 7, 1990 between the Company
         and the investors listed therein (the "Series C Agreement") and (f)
         Options to Purchase an aggregate of 151,150 shares of Common Stock
         granted pursuant to the Amended and Restated 1989 Stock Plan of the
         Company (the "Plan"), there are no outstanding options, warrants,
         rights (including conversion or preemptive rights) or agreements for
         the purchase or acquisition from the Company of any shares of its
         capital stock.

                 2.3  Subsidiaries.  The Company does not presently own or
control, directly or indirectly, any interest in any other corporation,
association, partnership or other business entity.

                 2.4  Authorization.  All corporate action on the part of the
Company, its officers, directors and stockholders necessary for the
authorization, execution and delivery of this Agreement, the performance of all
obligations of the Company hereunder and the authorization, issuance (or
reservation for issuance) and delivery of the Series D Preferred Stock being
sold hereunder and the Common Stock issuable upon conversion of the Series D
Preferred Stock, to the extent that the foregoing requires performance on or
prior to the Closing, has been taken or will be taken on or prior to the
Closing, and this Agreement constitutes a valid and legally binding obligation
of the Company enforceable in accordance with its terms.

                 2.5  Valid Issuance of Preferred and Common Stock.

                 (a)  The Series D Preferred Stock which is being purchased by
the Investors hereunder, when issued, delivered and paid for in accordance with
the terms hereof for the consideration expressed herein, will be duly and
validly authorized and





                                      -3-
<PAGE>   4
issued, fully paid and nonassessable and, based in part upon the
representations of the Investors in this Agreement, will be issued in
compliance with all applicable federal and state securities laws.  The Common
Stock issuable upon conversion of the Series D Preferred Stock purchased under
this Agreement has been or will be on or prior to the Closing, duly and validly
reserved for issuance and, upon issuance, will be duly and validly issued,
fully paid and nonassessable.

                 (b)  The outstanding shares of Common Stock, Series A
Preferred Stock, Series B Preferred Stock and Series C Preferred Stock are duly
and validly authorized and issued, fully paid and nonassessable, and were
issued in compliance with federal and state securities laws.

                 2.6  Governmental Consents.  No consent, approval, order or
authorization of, or registration, qualification, designation, declaration or
filing with, any federal, state, local or provincial governmental authority on
the part of the Company is required in connection with the consummation of the
transactions contemplated by this Agreement, except for the filing pursuant to
section 25102(f) of the California Corporate Securities Law of 1968, as
amended, and the rules thereunder, and any other post-sale filings pursuant to
applicable state securities laws, which filings will be effected prior to any
applicable deadlines.

                 2.7  Litigation.  There is no action, suit, proceeding or
investigation pending or currently threatened against the Company which
questions the validity of this Agreement or the right of the Company to enter
into it, or to consummate the transactions contemplated hereby, or which might
result, either individually or in the aggregate, in any material adverse change
in the assets, condition, affairs or prospects of the Company, financially or
otherwise, or any change in the current equity ownership of the Company, nor is
the Company aware that there is any basis for the foregoing.  The foregoing
includes, without limitation, actions pending or threatened (or any basis
therefor known to the Company) involving the prior employment of any of the
Company's employees, their use in connection with the Company's business of any
information or techniques allegedly proprietary to any of their former
employers, or their obligations under any agreements with prior employers.  The
Company is not a party or subject to the provisions of any order, writ,
injunction, judgment or decree of any court or government agency or
instrumentality.  There is no action, suit, proceeding or investigation by the
Company currently pending or which the Company intends to initiate.

                 2.8  Invention and Secrecy and Common Stock Purchase
Agreements.  Each key employee of the Company has executed an Employee's
Invention and Proprietary Information Agreement in substantially the form
provided to special counsel to the Investors.  The Company, after reasonable
investigation, is not aware





                                      -4-
<PAGE>   5
that any of its key employees are in violation thereof, and the Company will
use its best efforts to prevent any such violation.  Each holder of Common
Stock of the Company has entered into a Common Stock Purchase Agreement in
substantially the form made available to special counsel to the Investors.

                 2.9  Patents and Trademarks.  The Company has sufficient title
and ownership of all patents, trademarks, service marks, trade names,
copyrights, trade secrets, information, proprietary rights and processes
necessary for its business as now conducted and as proposed to be conducted
without any conflict with or infringement of the rights of others.  There are
no outstanding options, licenses or agreements of any kind relating to the
foregoing, nor is the Company bound by or a party to any options, licenses or
agreements of any kind with respect to the patents, trademarks, service marks,
trade names, copyrights, trade secrets, licenses, information, proprietary
rights and processes of any other person or entity.  The Company has not
received any communications alleging that the Company has violated or, by
conducting its business as proposed, would violate any of the patents,
trademarks, service marks, trade names, copyrights or trade secrets or other
proprietary rights of any other person or entity.  The Company is not aware
that any of its employees is obligated under any contract (including licenses,
covenants or commitments of any nature) or other agreement, or subject to any
judgment, decree or order of any court or administrative agency, that would
interfere with the use of his best efforts to promote the interests of the
Company or that would conflict with the Company's business as proposed to be
conducted.  Neither the execution nor delivery of this Agreement, nor the
carrying on of the Company's business by the employees of the Company, nor the
conduct of the Company's business as proposed, will, to the Company's
knowledge, after due inquiry, conflict with or result in a breach of the terms,
conditions or provisions of, or constitute a default under, any contract,
covenant or instrument under which any of such employees is now obligated,
which conflict, breach or default would be materially adverse to the Company.
It is not and it will not be necessary for the Company to utilize any
inventions of any of its employees (or people it currently intends to hire)
made prior to their employment by the Company.

                 2.10  Compliance with Other Instruments.  The Company is not
in violation or default of any provisions of its Certificate of Incorporation
or Bylaws, as amended, or of any instrument, judgment, order, writ, decree or
contract to which it is a party or by which it is bound or, to its knowledge,
of any provision of federal or state statute, rule or regulation applicable to
the Company, which violation or default would be materially adverse to the
Company.  The execution, delivery and performance of this Agreement and the
consummation of the transactions contemplated hereby will not result in any
such violation or be in conflict with or constitute, with or without the
passage of time and giving of notice, either a default under





                                      -5-
<PAGE>   6
any such provision, instrument, judgment, order, writ, decree or contract or an
event which results in the creation of any lien, charge or encumbrance upon any
assets of the Company, which violation, default, conflict or event would be
materially adverse to the Company.

                 2.11  Agreements; Action.

                 (a)  Except for the agreements explicitly contemplated hereby,
there are no agreements, understandings or proposed transactions between the
Company and any of its officers, directors, affiliates or any affiliate
thereof.

                 (b)  There are no agreements, understandings, instruments,
contracts or proposed transactions to which the Company is a party or by which
it is bound which involve (i) obligations of, or payments to the Company in
excess of, $50,000, other than liabilities or obligations of the Company for
compensation under employment agreements, (ii) the license of any patent,
copyright, trade secret or other proprietary right of the Company or (iii)
joint venture, partnership or other contract or arrangement involving the
sharing of profits or proprietary information or know how (other than
nondisclosure agreements), (iv) any contract or agreement limiting the
Company's right to engage in any business activity or compete with any person
or entity, or (v) any other material agreement.

                 (c)  The Company has not (i) declared or paid any dividends,
or authorized or made any distribution upon or with respect to any class or
series of its capital stock, (ii) incurred any indebtedness for money borrowed
or incurred any other liabilities individually in excess of $50,000 or in
excess of $100,000 in the aggregate, other than liabilities or obligations of
the Company for compensation under employment agreements, (iii) made any loans
or advances to any person, other than ordinary advances for travel expenses or
(iv) sold, exchanged or otherwise disposed of any of its assets or rights,
other than the sale of its inventory in the ordinary course of business.

                 (d)  The Company is not a party to and is not bound by any
contract, agreement or instrument, or subject to any restriction under its
Restated Certificate of Incorporation or Bylaws, which adversely affects in any
material respect its business as now conducted or as proposed to be conducted,
its properties or its financial condition.

                 (e)  The Company has not engaged in the past three months in
any discussion (i) with any representative of any corporation or corporations
regarding the consolidation or merger of the Company with or into any such
corporation or corporations, (ii) with any corporation, partnership,
association or other business entity or any individual regarding the sale,
conveyance or disposition of all or substantially all of





                                      -6-
<PAGE>   7
the assets of the Company or a transaction or series of related transactions in
which more than 50 percent of the voting power of the Company is disposed of,
or (iii) regarding any other form of liquidation, dissolution or winding up of
the Company.

                 2.12  Disclosure.  The Company believes it has fully provided
each Investor with all the information which such Investor has requested for
deciding whether to purchase the Series D Preferred Stock and all information
reasonably necessary to enable such Investor to make such decision.  Neither
this Agreement nor any other statement or certificate made or delivered in
connection herewith contains any untrue statement of a material fact or omits
to state a material fact necessary to make the statements herein or therein not
misleading.

                 2.13  Registration Rights.  Except as provided in Section 7 of
this Agreement, Section 7 of the Series A Agreement, Section 7 of the Series B
Agreement and Section 7 of the Series C Agreement, the Company has not granted
or agreed to grant any registration rights, including piggy-back rights, to any
person or entity.

                 2.14  Corporate Documents.  The Restated Certificate of
Incorporation and Bylaws of the Company are in the form previously provided
special counsel to the Investors.

                 2.15  Title to Property and Assets.  The Company owns its
property and assets free and clear of all mortgages, liens, loans and
encumbrances, except such encumbrances and liens which arise in the ordinary
course of business and do not materially impair the Company's ownership or use
of such property or assets.  With respect to the property and assets it leases,
the Company is in compliance with such leases and, to the best of its
knowledge, holds a valid leasehold interest free of any material liens, claims
or encumbrances.  All the Company's personal properties, whether owned or
leased, are in good operating condition, normal wear and tear excepted, and are
adequate and suitable for the purposes for which they are currently being used.

                 2.16  Employee Benefit Plans.  The Company does not have any
Employee Benefit Plan as described in section 3(2)(A) or section 3(2)(B) of the
Employee Retirement Income Security Act of 1974.

                 2.17  Tax Returns and Payments.  The Company has filed all tax
returns and reports as required by law.  These returns and reports are true and
correct in all material respects.  The Company has paid all taxes and other
assessments due prior to the time penalties would accrue thereon.  The
provision for taxes of the Company is adequate for taxes due or accrued as of
the date thereof.





                                      -7-
<PAGE>   8
                 2.18  Insurance.  The Company has in full force and effect
fire and casualty insurance policies, with extended coverage, sufficient in
amount (subject to reasonable deductibles) to allow it to replace any of its
properties that might be damaged or destroyed.

                 2.19  Minute Books.  The minute books of the Company made
available to special counsel to the Investors contain a complete summary of all
meetings of directors and stockholders since the time of incorporation and
reflect all transactions referred to in such minutes accurately in all material
respects.

                 2.20  Labor Agreements and Actions.  The Company is not bound
by or subject to (and none of its assets or properties is bound by or subject
to) any written or oral, express or implied, contract, commitment or
arrangement with any labor union, and no labor union has requested or, to the
knowledge of the Company, has sought to represent any of the employees,
representatives or agents of the Company.  There is no strike or other labor
dispute involving the Company pending, or to the knowledge of the Company
threatened, nor is the Company aware of any labor organization activity
involving its employees.  The Company is not aware that any officer or key
employee, or that any group of key employees, intends to terminate their
employment with the Company, nor does the Company have a present intention to
terminate the employment of any of the foregoing.

                 2.21  Real Property Holding Company.  The Company is not a
"United States real property holding corporation" (as that term is defined in
Treasury Regulation section 1.897-2(b)).  If at any time in the future the
Company shall become a "United States real property holding corporation," the
Company shall, as promptly as practicable, notify each foreign investor.
Within 30 days after receipt of a request from a foreign investor, the Company
shall prepare and deliver to such foreign investor the statement required under
Treasury Regulation section 1.897-2(h)(1)(i) and either or both of the
following documents:  (i) an affidavit in conformance with the requirements of
Internal Revenue Code of 1986, as amended ("IRC") section 1445(b)(3) or (ii) a
notarized statement, executed by an officer having actual knowledge of the
facts, that the shares of Company stock held by such foreign investor are of a
class that is regularly traded on an established securities market, within the
meaning of IRC section 1445(b)(6).  If the Company is unable to provide either
document described in (i) or (ii) above, if requested, it shall promptly notify
such foreign investor in writing of the reasons for such inability.  Finally,
upon the request of a foreign investor and without regard to whether either
document described in (i) or (ii) above has been requested, the Company shall
cooperate fully with the efforts of such foreign investor to obtain a
"qualifying statement," within the meaning of IRC section 1445(b)(4), or such
other documents as would excuse a transferee of a foreign investor's interest





                                      -8-
<PAGE>   9
from withholding of income tax imposed pursuant to IRC section 897(a).

                 2.22  Financial Statements.  The Company has delivered to each
Investor its audited financial statements (balance sheet and profit and loss
statement) at and for the period from inception through December 31, 1990, and
its unaudited interim financial statements at and for the period from January
1, 1991 through August 31, 1991 (the "Financial Statements").  The Financial
Statements are complete and correct in all material respects and have been
prepared in accordance with generally accepted accounting principles applied on
a consistent basis throughout the period indicated and are consistent with each
other.  The Financial Statements accurately set out and describe the financial
condition and operating results of the Company as of the date, and for the
period, indicated therein.  Except as set forth in the Financial Statements,
the Company has no liabilities, contingent or otherwise, other than (i)
liabilities incurred in the ordinary course of business subsequent to August
31, 1991, and (ii) obligations under contracts and commitments incurred in the
ordinary course of business and not required under generally accepted
accounting principles to be reflected in the Financial Statements, which,
individually or in the aggregate, are not material to the financial condition
or operating results of the Company.  The Company maintains and will continue
to maintain a standard system of accounting established and administered in
accordance with generally accepted accounting principles.

                 2.23  Voting Arrangements.  Except as may be provided in
Section 5.6 hereof, to the Company's knowledge there are no outstanding
stockholder agreements, voting trusts, proxies or other arrangements or
understandings among the stockholders of the Company relating to the voting of
their respective shares.

                 3.  Representations, Warranties, Covenants and Agreements of
Each Investor.  Each Investor hereby represents, warrants, covenants and agrees
that:

                 3.1  Authorization.  This Agreement constitutes its valid and
legally binding obligation.

                 3.2  Purchase Entirely for Own Account.  This Agreement is
made with each Investor in reliance upon such Investor's representation to the
Company, which by such Investor's execution of this Agreement such Investor
hereby confirms, that the Series D Preferred Stock to be received by such
Investor and the Common Stock issuable upon conversion thereof (collectively,
the "Securities") will be acquired for investment for such Investor's own
account, not as a nominee or agent, and not with a view to the resale or
distribution of any part thereof, and that such Investor has no present
intention of selling, granting any participation in, or otherwise distributing
the same.  By executing this Agreement, each Investor further represents that
such Investor does not have any contract, undertaking, agreement





                                      -9-
<PAGE>   10
or arrangement with any person to sell, transfer or grant participations to
such person or to any third person, with respect to any of the Securities.
Each Investor represents that it has full power and authority to enter into
this Agreement.

                 3.3  Disclosure of Information.  Each Investor believes it has
received all the information it considers necessary or appropriate for deciding
whether to purchase the Series D Preferred Stock.  Each Investor further
represents that it has had an opportunity to ask questions and receive answers
from the Company regarding the terms and conditions of the offering of the
Series D Preferred Stock.  The foregoing, however, does not limit or modify the
representations and warranties of the Company in Section 2 of this Agreement.

                 3.4  Investment Experience.  Each Investor is an investor in
securities of companies in the development stage and acknowledges that it is
able to fend for itself, can bear the economic risk of its investment and has
such knowledge and experience in financial or business matters that it is
capable of evaluating the merits and risks of the investment in the Series D
Preferred Stock.  If other than an individual, Investor also represents it has
not been organized solely for the purpose of acquiring the Series D Preferred
Stock.

                 3.5  Restricted Securities.  Each Investor understands that
the shares of Series D Preferred Stock it is purchasing are characterized as
"restricted securities" under the federal securities laws inasmuch as they are
being acquired from the Company in a transaction not involving a public
offering and that under such laws and applicable regulations such securities
may be resold only in certain limited circumstances without registration under
the Securities Act of 1933, as amended (the "Securities Act").  In this
connection each Investor represents that it is familiar with SEC Rule 144, as
presently in effect, and understands the resale limitations imposed thereby and
by the Securities Act.

                 3.6  Further Limitations on Disposition.  Without in any way
limiting the representations set forth above, each Investor further agrees not
to make any disposition of all or any portion of the Series D Preferred Stock
(or the Common Stock issuable upon the conversion thereof) unless and until:

                 (a)  There is then in effect a Registration Statement under
the Securities Act covering such proposed disposition and such disposition is
made in accordance with such Registration Statement; or

                 (b)  (i) Such Investor shall have notified the Company of the
proposed disposition and shall have furnished the Company with a detailed
statement of the circumstances surrounding the proposed disposition, and (ii)
if reasonably requested by the Company, such Investor shall have furnished the
Company with an





                                      -10-
<PAGE>   11
opinion of counsel, reasonably satisfactory to the Company, that such
disposition will not require registration of such shares under the Securities
Act.  It is agreed that the Company will not require opinions of counsel for
transactions made pursuant to Rule 144, as currently in existence, except in
unusual circumstances.

                 (c)  Notwithstanding the provisions of subsections (a) and (b)
above, no such registration statement or opinion of counsel shall be necessary
for a transfer by an Investor which is a partnership to a partner of such
partnership or a retired partner of such partnership who retires after the date
hereof, or to the estate of any such partner or retired partner or the transfer
by gift, will or intestate succession of any partner to his spouse or lineal
descendants or ancestors, if the transferee agrees in writing to be subject to
the terms of this Agreement to the same extent as if he were an original
Investor hereunder; provided, however, that the provisions of Section 3.6(b)
above shall apply if the Company or its counsel are unable to determine if such
transfer may be made in compliance with federal and applicable state securities
laws.

                 3.7  Legends.  It is understood that the certificates
evidencing the Series D Preferred Stock (and the Common Stock issuable upon
conversion thereof) may bear one or all of the following legends:

                 (a)  "The shares represented hereby have not been registered
under the United States Securities Act of 1933, and may not be sold,
transferred, assigned, pledged or hypothecated absent an effective registration
thereof under such act or compliance with Rule 144 promulgated under such act,
or unless the Company has received an opinion of counsel, satisfactory to the
Company and its counsel, that such registration is not required."

                 (b)  Any legend required by the laws of the State of
California or other jurisdiction, including any legend required by the
California Department of Corporations.

                 (c)      "The Provisions of Article IV, Section (B)4(d) of the
Company's Restated Certificate of Incorporation may result in more than one
Conversion Price for shares of Series D Preferred Stock.  The Company shall
maintain a ledger of such conversion prices for each holder of Series D
Preferred Stock, which information shall be available upon request to the
Secretary of the Company by any Person."

                 (d)      "The Company and the original purchaser of the shares
of Series D Preferred Stock represented by this certificate have entered into
an agreement which waives the adjustment of the Conversion Price of such shares
in certain circumstances.  A copy of the agreement is available from the
Secretary of the Company upon request."





                                      -11-
<PAGE>   12
                 3.8  Accredited or Foreign Investor.  Except as disclosed to
the Company in writing, each Investor either (i) is an accredited investor as
defined in Rule 501(a) of Regulation D, as amended, of the SEC under the
Securities Act, or (ii) is neither (x) a national or resident of the United
States, its territories, possessions or any area subject to its jurisdiction,
nor (y) a corporation, partnership, trust or other entity created or organized
in the United States, its territories, possessions or any area subject to its
jurisdiction, nor (z) a corporation, partnership, trust or other entity, any of
the equity owners of which is described in clause (x) or (y) above and agrees
not to sell, hypothecate, pledge or otherwise dispose of any interest in the
Securities in the United States, its territories, possessions or any area
subject to its jurisdiction, or to any person who is a national thereof or
resident therein (including any estate of such person), or any corporation,
partnership or other entity created or organized therein, unless such
securities have been either registered under the Securities Act, or are exempt
from the registration requirements of the Securities Act, in the opinion of the
Company's counsel, and the Investor has complied with any restrictions on
transfer contained in this Agreement.

                 3.9  Confidentiality.  Each Investor hereby represents,
warrants and covenants that it shall maintain in confidence, and shall not use
(except to evaluate its investment in the Company) or disclose without the
prior written consent of the Company, any confidential information that is
furnished to it by the Company in connection with this Agreement, including
(without limitation) all financial statements, budgets and other information
delivered or provided to Investors pursuant to Section 8 hereof.  This
obligation of confidentiality shall not apply, however, to any information (a)
in the public domain through no unauthorized act or failure to act by any
Investor, (b) lawfully disclosed to such Investor by a third party who
possessed such information without any obligation of confidentiality or (c)
lawfully developed by such Investor independent of any disclosure by the
Company.  Each Investor further covenants that it shall return to the Company
all tangible materials containing such information upon reasonable request by
the Company if such Investor is no longer a holder of shares of capital stock
of the Company.

                 3.10  Removal of Legends; Further Covenants.

                 (a)  Any legend endorsed on a certificate pursuant to Section
3.7(a) hereof shall be removed (i) if the shares of the Series D Preferred
Stock or Common Stock issued upon conversion thereof represented by such
certificate shall have been effectively registered under the Securities Act or
otherwise lawfully sold in a public transaction or in accordance with Rule 144,
(ii) if such shares may be transferred in compliance with Rule 144(k)
promulgated under the Securities Act, or (iii) if the holder of such shares
shall have provided the Company with





                                      -12-
<PAGE>   13
an opinion of counsel, in form and substance acceptable to the Company and its
counsel and from attorneys reasonably acceptable to the Company and its
counsel, stating that a public sale, transfer or assignment of such shares may
be made without registration.

                 (b)  Any legend endorsed on a certificate pursuant to Section
3.7(b) hereof shall be removed if the Company receives an order of the
appropriate state authority authorizing such removal or if the holder of the
Series D Preferred Stock or Common Stock issued upon conversion thereof
provides the Company with an opinion of counsel, in form and substance
acceptable to the Company and its counsel and from attorneys reasonably
acceptable to the Company and its counsel, stating that such state legend may
be removed.

                 (c)  Each Investor further covenants that such Investor will
not transfer the Series D Preferred Stock or any securities received in
exchange therefor or on conversion thereof, in violation of the Securities Act,
the Securities Exchange Act of 1934, as amended (the "Exchange Act"), or the
rules of the Commission promulgated thereunder, including rule 144 under the
Securities Act.  Further, each Investor agrees that, prior to the closing of
the corporation's initial public offering, such Investor will not transfer any
of such securities in a public offering without the Company's prior consent,
even if he is otherwise permitted to transfer them pursuant to Rule 144(k);
provided that the foregoing shall not affect Investor's rights under Section 7.

                 3.11  Waiver of Antidilution Adjustment.

                 (a)      Each Investor purchasing shares of Series D Preferred
Stock hereunder hereby agrees that in the event that:

                 (i)      the Company shall give a holder of Series D Preferred
         Stock twenty calendar days notice of the Company's intent to offer a
         Dilutive Issuance (as defined below) together with the terms and
         conditions of such Dilutive Issuance, and

                 (ii)  the Company shall offer such holder of Series D
         Preferred Stock that portion (a "Pro-Rata Portion") of such Dilutive
         Issuance which equals the proportion that the number of shares of
         Common Stock issuable upon conversion of the Series D Preferred Stock
         then held by such holder bears to the total number of shares of Common
         Stock issuable upon conversion of the Preferred Stock then outstanding
         (excluding the Series A Preferred Stock), or such lesser portion as
         the Company may specify in writing, and





                                      -13-
<PAGE>   14
                 (iii)  such holder fails to tender to the Company, other than
         at the written request of the Company, the purchase price of such
         holder's Pro-Rata Portion (or such lesser portion as the Company may
         specify in writing) of such Dilutive Issuance on the scheduled closing
         of such Dilutive Issuance (which shall not be less than 20 days after
         the written notice provided in (i) above),

then no adjustment of the Conversion Price shall be made (other than
adjustments made prior to the time of such Dilutive Issuance), and any future
adjustment shall be deemed waived, with respect to the shares of Series D
Preferred Stock held by such holder.  Notwithstanding the foregoing:  (a) if no
holder of Series D Preferred Stock purchases any part of such Dilutive
Issuance, the provisions of this Section 3.11(a) shall not apply to such
Dilutive Issuance; (b) in the event any Dilutive Issuance is in excess of
$8,000,000, the provisions of this Section 3.11(a) shall not apply to any
holder who purchases less than such holder's Pro-Rata Portion of such Dilutive
Issuance if the purchase price of such lesser portion is an amount equal to or
greater than such holder's Pro-Rata Portion of $8,000,000; (c) it is understood
and agreed that if the Company only offers an Investor an opportunity to
purchase less than an Investor's Pro Rata Portion, that no waiver shall result
from Investor purchasing such lesser portion (including, without limitation,
the portion of such Dilutive Issuance Investor may purchase under Section 8.4);
and (d) the provisions of this Section 3.11(a) shall apply to the closing of
only one Dilutive Issuance in any 12-month period.

                 (b)  A "Dilutive Issuance" shall mean an issuance and sale of
Additional Shares of Common Stock (including Additional Shares of Common Stock
deemed to be Issued pursuant to Article IV, Section (B)4(d)(ii) of the Restated
Certificate) with respect to the Series D Preferred Stock in excess of
$250,000.  Defined terms in this Section 3.11 not otherwise defined in this
Agreement shall have the meanings given such terms in the Restated Certificate.

                 (c)  Any offer of a Dilutive Issuance pursuant to this Section
3.11 shall be subject to the rights of first offer described in Section
2.2(iii) hereof.

                 (d)  In the event the provisions of this Section 3.11 result
in more than one Conversion Price for the Series D Preferred Stock, the
Secretary of the Company shall keep a written ledger identifying the Conversion
Price in effect for each share of Series D Preferred Stock outstanding, which
information shall be made available to any person upon request.

                 (e)  The waiver of adjustment of Conversion Price provided for
in this Section 3.11 shall bind any transferee of shares of Series D Preferred
Stock.  Each Investor agrees that,





                                      -14-
<PAGE>   15
prior to transferring any shares of Series D Preferred Stock to any person or
entity, such Investor will ensure that such transferee shall have delivered to
the Company a written agreement to be bound by the provisions of this Section
3.11.

                 4.  California Commissioner of Corporations.

                 4.1  Corporate Securities Law.  THE SALE OF THE SECURITIES
WHICH ARE THE SUBJECT OF THIS AGREEMENT HAS NOT BEEN QUALIFIED WITH THE
COMMISSIONER OF CORPORATIONS OF THE STATE OF CALIFORNIA AND THE ISSUANCE OF
SUCH SECURITIES OR THE PAYMENT OR RECEIPT OF ANY PART OF THE CONSIDERATION
THEREFOR PRIOR TO SUCH QUALIFICATION IS UNLAWFUL, UNLESS THE SALE OF SECURITIES
IS EXEMPT FROM THE QUALIFICATION BY SECTIONS 25100, 25102 OR 25105 OF THE
CALIFORNIA CORPORATIONS CODE.  THE RIGHTS OF ALL PARTIES TO THIS AGREEMENT ARE
EXPRESSLY CONDITIONED UPON SUCH QUALIFICATION BEING OBTAINED, UNLESS THE SALE
IS SO EXEMPT.

                 5.  Conditions of Investors' Obligations at Closing and
Subsequent Closings.  The obligations of each Investor under subsections 1.1(b)
of this Agreement are subject to the fulfillment on or before Closing of each
of the following conditions, the waiver of which shall not be effective against
any Investor who does not consent in writing thereto:

                 5.1  Representations and Warranties.  The representations and
warranties of the Company contained in Section 2 shall be true on and as of the
Closing with the same effect as though such representations and warranties had
been made on and as of the date of the Closing.

                 5.2  Performance.  The Company shall have performed and
complied with all agreements, obligations and conditions contained in this
Agreement that are required to be performed or complied with by it on or before
the Closing; provided that the obligations of the Investors shall not be
conditional upon the issuance by the Company of the Series D Preferred Stock to
the persons or entities listed on Schedule A who have not performed or tendered
the performance of their obligations under this Agreement required to be
performed on or prior to the Closing except as provided in Section 5.7 hereof.

                 5.3  Compliance Certificate.  The President of the Company
shall deliver to each Investor at the Closing a certificate certifying that the
conditions specified in Sections 5.1 and 5.2 have been fulfilled and stating
that there has been no material adverse change in the business, affairs,
prospects, operations, properties, assets or condition of the Company since the
date of the Agreement.

                 5.4  Qualifications.  The Commissioner of Corporations of the
State of California shall have issued a permit qualifying the offer and sale of
the Series D Preferred Stock and the underlying Common Stock to the Investors
pursuant to this





                                      -15-
<PAGE>   16
Agreement, or such offer and sale shall be exempt from such qualification under
the California Corporate Securities Law of 1968, as amended.

                 5.5  Proceedings and Documents.  All corporate and other
proceedings in connection with the transactions contemplated at the Closing and
all documents incident thereto shall be reasonably satisfactory in form and
substance to special counsel to the Investors and to each Investor, and they
shall have received all such counterpart original and certified or other copies
of such documents as they may reasonably request.

                 5.6  Board of Directors.  The Board of Directors at the
Closing shall consist of eight duly elected members: Thomas H. Adams, Kim D.
Blickenstaff, Frederick J. Dotzler, Howard E. Greene, Stephen K. Reidy, Jesse
I. Treu, Gunars E. Valkirs and Timothy J. Wollaeger.

                 5.7  Minimum Investment.  The Investors shall have purchased
at the Closing specified in Section 1.2, an aggregate of at least 1,000,000
shares of Series D Preferred Stock.

                 5.8  Opinion of Company Counsel.  Each Investor shall have
received from Pillsbury Madison & Sutro, counsel for the Company, an opinion,
dated as of the Closing, in form and substance satisfactory to the Investors,
to the effect that:

                 (a)  The Company is a corporation duly organized, validly
existing and in good standing under the laws of the State of Delaware, and the
Company has the requisite corporate power and authority to own its properties
and to conduct its business.

                 (b)  The Company is qualified to do business as a foreign
corporation in the State of California.

                 (c)  The Company has the requisite corporate power and
authority to execute, deliver and perform the Agreement.  The Agreement has
been duly and validly authorized by the Company, duly executed and delivered by
an authorized officer of the Company and constitutes a legal, valid and binding
obligation of the Company.

                 (d)  The capitalization of the Company is as follows:

                 (i)  Preferred Stock.  6,970,503 shares of Preferred Stock,
         $.01 par value per share, 610,000 shares of which have been designated
         Series A Preferred Stock, 2,156,336 shares of which have been
         designated Series B Preferred Stock, 2,204,167 shares of which have
         been designated Series C Preferred Stock and 2,000,000 shares of which
         have been designated Series D Preferred Stock.  610,000 shares of
         Series A Preferred Stock, 2,156,336 shares of Series B





                                      -16-
<PAGE>   17
         Preferred Stock and 2,204,167 shares of Series C Preferred Stock have
         been duly authorized, issued and delivered, are validly outstanding,
         fully paid and nonassessable, and have been approved by all requisite
         corporate action and, based in part on the representations and
         warranties of the investors in such securities, were issued in
         compliance with all applicable federal and California securities laws.
         The shares of Series D Preferred Stock being issued under this
         Agreement, when issued, delivered and paid for, will be duly
         authorized, issued and delivered and will be validly outstanding,
         fully paid and nonassessable, and have been approved by all requisite
         corporate action and, to the best of counsel's knowledge, are free of
         any liens and encumbrances.  The rights, privileges and preferences of
         the Series A Preferred Stock, the Series B Preferred Stock, the Series
         C Preferred Stock and the Series D Preferred Stock are as stated in
         the Company's Restated Certificate.  The shares of Common Stock
         issuable upon the conversion of the Series A Preferred Stock, the
         Series B Preferred Stock, the Series C Preferred Stock and the Series
         D Preferred Stock have been duly and validly reserved for issuance
         and, when issued in accordance with the Company's Restated
         Certificate, will be validly issued, fully paid and nonassessable.

                 (ii)  Common Stock.  12,000,000 shares of Common Stock, of
         which 1,134,397 shares have been duly authorized, issued and delivered
         and are validly outstanding, fully paid and nonassessable.

                 (iii)  Except for (A) the conversion privileges of the Series
         A Preferred Stock, Series B Preferred Stock, Series C Preferred Stock
         and Series D Preferred Stock, (B) the right of first offer of the
         Investors provided for in Section 8.4 of this Agreement, (C) the right
         of first offer provided for in Section 8.4 of the Series A Agreement,
         (D) the right of first offer provided in Section 8.4 of the Series B
         Agreement, (E) the right of first offer provided for in Section 8.4 of
         the Series C Agreement and (F) options to purchase Common Stock of the
         Company issued under the 1989 Stock Plan of the Company, there are no
         preemptive rights or, to the best of counsel's knowledge, options,
         warrants, conversion privileges or other rights (or agreements for any
         such rights) outstanding to purchase from or otherwise obtain from the
         Company any shares of its capital stock.

                 (e)  The certificates representing shares of the Series D
Preferred Stock are in due and proper form and have been duly and validly
executed by the officers of the Company named thereon.





                                      -17-
<PAGE>   18
                 (f)  The execution, delivery, performance and compliance with
the terms of this Agreement do not violate any provision of any applicable
federal, state law, rule or regulation or any provision of the Company's
Restated Certificate or Bylaws and, to the best of such counsel's knowledge, do
not conflict with or constitute a default under the provision of any material
judgment, writ, decree, order or agreement to which the Company is a party or
by which it is bound, which violation, conflict or default would be materially
adverse to the Company.

                 (g)  All consents, approvals, orders or authorizations of, and
all qualifications, registrations, designations, declarations or filings with,
any federal or state governmental authority on the part of the Company (other
than by federal or state securities laws which are covered in paragraph (h)
below) required to be made prior to the Closing in connection with the
consummation of the transactions contemplated by this Agreement have been
obtained, and are effective, as of the Closing and such counsel is not aware of
any proceedings, or threat thereof, which question the validity thereof.

                 (h)  Based in part upon the representations of the Investors,
the offer and sale of the Series D Preferred Stock pursuant to the terms of
this Agreement are exempt from the registration requirements of section 5 of
the Securities Act of 1933, as amended, by virtue of section 4(2) thereof and
from the qualification requirements of the California Corporate Securities Law
of 1968, as amended, by virtue of section 25102(f) thereof.  No opinion need be
expressed as to compliance with applicable antifraud statutes, rules and
regulations of any applicable law governing the issuance of securities.

                 (i)  Such counsel is not aware, after making inquiry of the
Company's chief executive officer (but without any other investigation), that
there is any action, proceeding or investigation pending against the Company or
any of its officers, directors or employees, or that any of the foregoing has
received any threat thereof, which questions the validity of the Agreement, or
which might result, either individually or in the aggregate, in any material
adverse change in the assets, condition, affairs or prospects of the Company.

                 The opinion of counsel for the Company under this Section 5.8
shall be subject to such matters as are set forth in the Schedule of Exceptions
to this Agreement.

                 5.9  Restated Certificate.  The Restated Certificate in
substantially the same form attached hereto as Exhibit A shall have been filed
with the Delaware Secretary of State.

                 5.10  Lawful Issuance.  At the Closing, the purchase of the
Series D Preferred Stock by the Investors shall be





                                      -18-
<PAGE>   19
legally permitted by all laws and regulations to which the Investors and the
Company are subject.

                 5.11     Amended Co-Sale Agreement.  The Company shall have
entered into an amended and restated Co-Sale Agreement in substantially the
form of Exhibit B hereto together with the Principal Stockholders (as defined
therein).

                 6.  Conditions of the Company's Obligations at the Closing.
The obligations of the Company to each Investor under this Agreement are
subject to the fulfillment on or before the Closing of each of the following
conditions by such Investor:

                 6.1  Representations and Warranties.  The representations and
warranties of the Investor contained in Section 3 hereof shall be true on and
as of the Closing with the same effect as though such representations and
warranties had been made on and as of the Closing.

                 6.2  Payment of Purchase Price.  Each Investor shall have
delivered the purchase price specified in Section 1.2 and Investors shall
collectively have acquired and paid for at the Closing specified in Section
1.2, an aggregate of at least 1,000,000 shares of Series D Preferred Stock.

                 6.3  California Qualification.  The Commissioner of
Corporations of the State of California shall have issued a permit qualifying
the offer and sale to the Investors of the Series D Preferred Stock and Common
Stock issuable upon the conversion thereof or such offer and sale shall be
exempt from such qualification under the California Corporate Securities Law of
1968, as amended.

                 7.  Registration Rights.  The Company covenants and agrees as
follows:

                 7.1  Definitions.  For purposes of this Section 7:

                 (a)  The terms "register," "registered" and "registration"
refer to a registration effected by preparing and filing a registration
statement or similar document in compliance with the Securities Act, and the
declaration or ordering of effectiveness of such registration statement or
document;

                 (b)  The term "Registrable Securities" means (i) the Common
Stock issuable or issued upon conversion of the Series A Preferred Stock, the
Series B Preferred Stock, the Series C Preferred Stock, the Series D Preferred
Stock and any other series of Preferred Stock of the Company with respect to
which, and in accordance with this Agreement, registration rights substantially
similar to the registration rights provided in this Section 7 may be granted,
and (ii) any Common Stock of the Company issued as (or issuable upon the
conversion or exercise of any warrant, right or other security which is issued
as)





                                      -19-
<PAGE>   20
a dividend or other distribution with respect to, or in exchange for or in
replacement of, such Preferred Stock or Common Stock, excluding in all cases,
however, any Registrable Securities sold by a person in a transaction in which
such person's registration rights are not assigned;

                 (c)  The number of shares of "Registrable Securities then
outstanding" shall be determined by the number of shares of Common Stock
outstanding which are, and the number of shares of Common Stock issuable
pursuant to then exercisable or convertible securities which are exercisable or
convertible into, Registrable Securities;

                 (d)  The term "Holder" means any person owning or having the
right to acquire Registrable Securities or any assignee thereof in accordance
with Section 7.13 hereof; and

                 (e)  The term "Form S-3" means such form under the Securities
Act as in effect on the date hereof or any registration form under the
Securities Act subsequently adopted by the Securities and Exchange Commission
("SEC") in lieu of Form S-3 which permits inclusion or incorporation of
substantial information by reference to other documents filed by the Company
with the SEC.

                 7.2  Request for Registration.

                 (a)  If the Company shall receive at any time after the
earlier of January 15, 1994 or six months after the effective date of the
Company's first registered public offering of stock a written request from the
Holders of at least 30% of the Registrable Securities then outstanding that the
Company file a registration statement under the Securities Act covering the
registration of at least 30% of the Registrable Securities and with an offering
price, net of underwriting discounts and commissions, of more than $7,500,000
then the Company shall, within ten days of the receipt thereof, give written
notice of such request to all Holders and shall, subject to the limitations of
subsection 7.2(b), file as soon as practicable, and in any event within 60 days
of the receipt of such request, a registration statement under the Securities
Act covering all Registrable Securities which the Holders request to be
registered within 20 days of the mailing of such notice by the Company in
accordance with Section 9.6.

                 (b)  If the Holders initiating the registration request
hereunder ("Initiating Holders") intend to distribute the Registrable
Securities covered by their request by means of an underwriting, they shall so
advise the Company as a part of their request made pursuant to this Section 7.2
and the Company shall include such information in the written notice referred
to in subsection 7.2(a).  In such event, the right of any Holder to include
such Holder's Registrable Securities in such registration shall be conditioned
upon such Holder's participation in





                                      -20-
<PAGE>   21
such underwriting and the inclusion of such Holder's Registrable Securities in
the underwriting (unless otherwise mutually agreed by a majority in interest of
the Initiating Holders and such Holder) to the extent provided herein.  All
Holders proposing to distribute their securities through such underwriting
shall (together with the Company as provided in subsection 7.4(e)) enter into
an underwriting agreement in customary form with the underwriter or
underwriters selected for such underwriting by a majority in interest of the
Initiating Holders.  Notwithstanding any other provision of this Section 7.2,
if the underwriter advises the Initiating Holders in writing that marketing
factors require a limitation of the number of shares to be underwritten, then
the Initiating Holders shall so advise all Holders of Registrable Securities
which would otherwise be underwritten pursuant hereto, and the number of shares
of Registrable Securities that may be included in the underwriting shall be
allocated among all Holders thereof, including the Initiating Holders, in
proportion (as nearly as practicable) to the number of shares of Registrable
Securities of the Company owned by each Holder.

                 (c)  The Company is obligated to effect only two such
registrations pursuant to this Section 7.2; provided, however, that the Company
shall not be obligated to effect any such registration if the Company has,
within twelve months preceding the date of receipt of the request for such
registration, already effected one such demand registration pursuant to this
Section 7.2.

                 (d)  Notwithstanding the foregoing, if the Company shall
furnish to Holders requesting a registration statement pursuant to this Section
7.2, a certificate signed by the President of the Company stating that in the
good faith judgment of the Board of Directors of the Company, it would be
seriously detrimental to the Company and its stockholders for such registration
statement to be filed and it is therefore essential to defer the filing of such
registration statement, the Company shall have the right to defer such filing
for a period of not more than 60 days after receipt of the request of the
Initiating Holders; provided, however, that the Company may not utilize this
right more than once in any 12-month period.

                 7.3  Company Registration.  If (but without any obligation to
do so) the Company proposes to register (including for this purpose a
registration effected by the Company for stockholders other than the Holders)
any of its stock or other securities under the Securities Act in connection
with the public offering of such securities solely for cash (other than a
registration relating solely to the sale of securities to participants in a
Company stock plan, or a registration on any form which does not include
substantially the same information as would be required to be included in a
registration statement covering the sale of the Registrable Securities), the
Company shall, at such time, promptly give each Holder written notice of





                                      -21-
<PAGE>   22
such registration.  Upon the written request of each Holder given within 20
days after mailing of such notice by the Company in accordance with Section
9.6, the Company shall, subject to the provisions of Section 7.8, cause to be
registered under the Securities Act all of the Registrable Securities that each
such Holder has requested to be registered.

                 7.4  Obligations of the Company.  Whenever required under this
Section 7 to effect the registration of any Registrable Securities, the Company
shall, as expeditiously as reasonably possible:

                 (a)  Prepare and file with the SEC a registration statement
with respect to such Registrable Securities and use its best efforts to cause
such registration statement to become effective, and, upon the request of the
Holders of a majority of the Registrable Securities registered thereunder, keep
such registration statement effective for up to 120 days.

                 (b)  Prepare and file with the SEC such amendments and
supplements to such registration statement and the prospectus used in
connection with such registration statement as may be necessary to comply with
the provisions of the Securities Act with respect to the disposition of all
securities covered by such registration statement.

                 (c)  Furnish to the Holders such number of copies of a
prospectus, including a preliminary prospectus, in conformity with the
requirements of the Securities Act, and such other documents as they may
reasonably request in order to facilitate the disposition of Registrable
Securities owned by them.

                 (d)  Use its best efforts to register and qualify the
securities covered by such registration statement under such other securities
or Blue Sky laws of such jurisdictions as shall be reasonably requested by the
Holders, provided that the Company shall not be required in connection
therewith or as a condition thereto to qualify to do business or to file a
general consent to service of process in any such states or jurisdictions.

                 (e)  In the event of any underwritten public offering, enter
into and perform its obligations under an underwriting agreement, in usual and
customary form, with the managing underwriter of such offering.  Each Holder
participating in such underwriting shall also enter into and perform its
obligations under such an agreement.

                 (f)  Notify each Holder of Registrable Securities covered by
such registration statement at any time when a prospectus relating thereto is
required to be delivered under the Securities Act of the happening of any event
as a result of which the prospectus included in such registration statement, as
then in effect, includes an untrue statement of a material fact





                                      -22-
<PAGE>   23
or omits to state a material fact required to be stated therein or necessary to
make the statements therein not misleading in the light of the circumstances
then existing.

                 (g)  Furnish, at the request of any Holder requesting
registration of Registrable Securities pursuant to this Section 7, on the date
that such Registrable Securities are delivered to the underwriters for sale in
connection with a registration pursuant to this Section 7, if such securities
are being sold through underwriters, or, if such securities are not being sold
through underwriters, on the date that the registration statement with respect
to such securities becomes effective, (i) an opinion, dated such date, of the
counsel representing the Company for the purposes of such registration, in form
and substance as is customarily given to underwriters in an underwritten public
offering, addressed to the underwriters, if any, and to the Holders requesting
registration of Registrable Securities and (ii) a letter dated such date, from
the independent certified public accountants of the Company, in form and
substance as is customarily given by independent certified public accountants
to underwriters in an underwritten public offering, addressed to the
underwriters, if any, and to the Holders requesting registration of Registrable
Securities.

                 7.5  Furnish Information.  It shall be a condition precedent
to the obligations of the Company to take any action pursuant to this Section 7
that the selling Holders shall furnish to the Company such information
regarding themselves, the Registrable Securities held by them, and the intended
method of disposition of such securities as shall be required to effect the
registration of the Registrable Securities.

                 7.6  Expenses of Demand Registration.  All expenses other than
underwriting discounts and commissions and fees and expenses of counsel for the
selling Holders, incurred in connection with registrations, filings or
qualifications pursuant to Section 7.2, including (without limitation) all
registration, filing and qualification fees, printer's and accounting fees,
fees and disbursements of counsel for the Company, shall be borne by the
Company; provided, however, that the Company shall not be required to pay for
any expenses of any registration proceeding begun pursuant to Section 7.2 if
the registration request is subsequently withdrawn at the request of the
Holders of a majority of the Registrable Securities to be registered (in which
case all participating Holders shall bear such expenses), unless the Holders of
a majority of the Registrable Securities agree to forfeit their right to one
demand registration pursuant to Section 7.2; provided further, however, that if
at the time of such withdrawal, the Holders have learned of a material adverse
change in the condition, business or prospects of the Company from that known
to the Holders at the time of their request, then the Holders shall not be
required to pay any of such expenses and shall retain their rights pursuant to
Section 7.2.





                                      -23-
<PAGE>   24
                 7.7  Expenses of Company Registration.  The Company shall bear
and pay all expenses incurred in connection with any registration, filing or
qualification of Registrable Securities with respect to the registrations
pursuant to Section 7.3 for each Holder (which right may be assigned as
provided in Section 7.13), including (without limitation) all registration,
filing and qualification fees, printer's and accounting fees relating or
apportionable thereto, but excluding underwriting discounts and commissions
relating to Registrable Securities and the fees and disbursements of counsel
for the selling Holders.

                 7.8  Underwriting Requirements.  In connection with any
offering involving an underwriting of shares being issued by the Company, the
Company shall not be required under Section 7.3 to include any of the Holders'
securities in such underwriting unless they accept the terms of the
underwriting as agreed upon between the Company and the underwriters selected
by it, and then only in such quantity as will not, in the opinion of the
underwriters, jeopardize the success of the offering by the Company.  If the
total amount of securities, including Registrable Securities, requested by
stockholders to be included in such offering exceeds the amount of securities
sold other than by the Company that the underwriters reasonably believe
compatible with the success of the offering, then the Company shall be required
to include in the offering only that number of such securities, including
Registrable Securities, which the underwriters believe will not jeopardize the
success of the offering (the securities so included to be apportioned pro rata
among the selling stockholders according to the total amount of securities
entitled to be included therein owned by each selling stockholder or in such
other proportions as shall mutually be agreed to by such selling stockholders)
but:  (i) in no event shall the amount of securities of the selling Holders
included in the offering be reduced below 30% of the total amount of securities
included in such offering, unless such offering is the initial public offering
of the Company's securities in which case the selling stockholders may be
excluded if the underwriters make the determination described above and no
other stockholder's securities are included; and (ii) in no event shall any
shares being sold by a stockholder exercising a demand registration right
similar to that granted in Section 7.2 be excluded from such offering.

                 7.9  Delay of Registration.  No Holder shall have any right to
obtain or seek an injunction restraining or otherwise delaying any such
registration as the result of any controversy that might arise with respect to
the interpretation or implementation of this Section 7.

                 7.10  Indemnification.  In the event any Registrable
Securities are included in a registration statement under this Section 7:





                                      -24-
<PAGE>   25
                 (a)  To the extent permitted by law, the Company will
indemnify and hold harmless each Holder, the officers and directors of each
Holder, any underwriter (as defined in the Securities Act) for such Holder and
each person, if any, who controls such Holder or underwriter within the meaning
of the Securities Act or the Securities Exchange Act of 1934, as amended (the
"Exchange Act"), against any losses, claims, damages or liabilities (joint or
several) to which they may become subject under the Securities Act, the
Exchange Act or other federal or state law, insofar as such losses, claims,
damages or liabilities (or actions in respect thereof) arise out of or are
based upon any of the following statements, omissions or violations
(collectively, a "Violation"):  (i) any untrue statement or alleged untrue
statement of a material fact contained in such registration statement,
including any preliminary prospectus or final prospectus contained therein or
any amendments or supplements thereto, (ii) the omission or alleged omission to
state therein a material fact required to be stated therein, or necessary to
make the statements therein not misleading, or (iii) any violation or alleged
violation by the Company of the Securities Act, the Exchange Act, any state
securities law or any rule or regulation promulgated under the Securities Act,
the Exchange Act or any state securities law; and the Company will reimburse
each such Holder, officer or director, underwriter or controlling person for
any legal or other expenses reasonably incurred by them in connection with
investigating or defending any such loss, claim, damage, liability or action;
provided, however, that the indemnity agreement contained in this subsection
7.10(a) shall not apply to amounts paid in settlement of any such loss, claim,
damage, liability or action if such settlement is effected without the consent
of the Company (which consent shall not be unreasonably withheld), nor shall
the Company be liable in any such case for any such loss, claim, damage,
liability or action to the extent that it arises out of or is based upon a
Violation which occurs in reliance upon and in conformity with written
information furnished expressly for use in connection with such registration by
any such Holder, officer, director, underwriter or controlling person.

                 (b)  To the extent permitted by law, each selling Holder will
indemnify and hold harmless the Company, each of its directors, each of its
officers who have signed the registration statement, each person, if any, who
controls the Company within the meaning of the Securities Act, any underwriter
and any other Holder selling securities in such registration statement or any
of its directors or officers or any person who controls such Holder, against
any losses, claims, damages or liabilities (joint or several) to which the
Company or any such director, officer, controlling person, or underwriter or
controlling person, or other such Holder or director, officer or controlling
person may become subject, under the Securities Act, the Exchange Act or other
federal or state law, insofar as such losses, claims, damages or liabilities
(or actions in respect





                                      -25-
<PAGE>   26
thereto) arise out of or are based upon any Violation, in each case to the
extent (and only to the extent) that such Violation occurs in reliance upon and
in conformity with written information furnished by such Holder expressly for
use in connection with such registration; and each such Holder will reimburse
any legal or other expenses reasonably incurred by the Company or any such
director, officer, controlling person, underwriter or controlling person, other
Holder, officer, director, or controlling person in connection with
investigating or defending any such loss, claim, damage, liability, or action;
provided, however, that the indemnity agreement contained in this subsection
7.10(b) shall not apply to amounts paid in settlement of any such loss, claim,
damage, liability or action if such settlement is effected without the consent
of the Holder, which consent shall not be unreasonably withheld; provided,
that, in no event shall any indemnity under this subsection 7.10(b) exceed the
gross proceeds from the offering received by such Holder.

                 (c)  Promptly after receipt by an indemnified party under this
Section 7.10 of notice of the commencement of any action (including any
governmental action), such indemnified party will, if a claim in respect
thereof is to be made against any indemnifying party under this Section 7.10,
deliver to the indemnifying party a written notice of the commencement thereof
and the indemnifying party shall have the right to participate in, and, to the
extent the indemnifying party so desires, jointly with any other indemnifying
party similarly noticed, to assume the defense thereof with counsel mutually
satisfactory to the parties; provided, however, that an indemnified party shall
have the right to retain its own counsel, with the fees and expenses to be paid
by the indemnifying party, if representation of such indemnified party by the
counsel retained by the indemnifying party would be inappropriate due to actual
or potential differing interests between such indemnified party and any other
party represented by such counsel in such proceeding.  The failure to deliver
written notice to the indemnifying party within a reasonable time of the
commencement of any such action, if prejudicial to its ability to defend such
action, shall relieve such indemnifying party of any liability to the
indemnified party under this Section 7.10, but the omission so to deliver
written notice to the indemnifying party will not relieve it of any liability
that it may have to any indemnified party otherwise than under this Section
7.10.

                 (d)  The obligations of the Company and Holders under this
Section 7.10 shall survive the completion of any offering of Registrable
Securities in a registration statement under this Section 7, and otherwise.

                 7.11  Reports Under Securities Exchange Act of 1934.  With a
view to making available to the Holders the benefits of Rule 144 promulgated
under the Securities Act and any other rule or regulation of the SEC that may
at any time permit a Holder to





                                      -26-
<PAGE>   27
sell securities of the Company to the public without registration or pursuant
to a registration on Form S-3, the Company agrees to:

                 (a)  make and keep public information available, as those
terms are understood and defined in SEC Rule 144, at all times after 90 days
after the effective date of the first registration statement filed by the
Company for the offering of its securities to the general public;

                 (b)  take such action, including the voluntary registration of
its Common Stock under section 12 of the Exchange Act, as is necessary to
enable the Holders to utilize Form S-3 for the sale of their Registrable
Securities, such action to be taken as soon as practicable after the end of the
fiscal year in which the first registration statement filed by the Company for
the offering of its securities to the general public is declared effective;

                 (c)  file with the SEC in a timely manner all reports and
other documents required of the Company under the Securities Act and the
Exchange Act; and

                 (d)  furnish to any Holder, so long as the Holder owns any
Registrable Securities, forthwith upon request (i) a written statement by the
Company that it has complied with the reporting requirements of SEC Rule 144
(at any time after 90 days after the effective date of the first registration
statement filed by the Company), the Securities Act and the Exchange Act (at
any time after it has become subject to such reporting requirements), or that
it qualifies as a registrant whose securities may be resold pursuant to Form
S-3 (at any time after it so qualifies), (ii) a copy of the most recent annual
or quarterly report of the Company and such other reports and documents so
filed by the Company, and (iii) such other information as may be reasonably
requested in availing any Holder of any rule or regulation of the SEC which
permits the selling of any such securities without registration or pursuant to
such form.

                 7.12  Form S-3 Registration.  In case the Company shall
receive from any Holder or Holders a written request or requests that the
Company effect a registration on Form S-3 and any related qualification or
compliance with respect to all or a part of the Registrable Securities owned by
such Holder or Holders, the Company will:

                 (a)  promptly give written notice of the proposed
registration, and any related qualification or compliance, to all other
Holders; and

                 (b)  as soon as practicable, effect such registration and all
such qualifications and compliances as may be so requested and as would permit
or facilitate the sale and distribution of all or such portion of such Holder's
or Holders'





                                      -27-
<PAGE>   28
Registrable Securities as are specified in such request, together with all or
such portion of the Registrable Securities of any other Holder or Holders
joining in such request as are specified in a written request given within 15
days after receipt of such written notice from the Company; provided, however,
that the Company shall not be obligated to effect any such registration,
qualification or compliance pursuant to this Section 7.12:  (i) if Form S-3 is
not available for such offering by the Holders; (ii) if the Holders, together
with the holders of any other securities of the Company entitled to inclusion
in such registration, propose to sell Registrable Securities and such other
securities (if any) at an aggregate price to the public (net of any
underwriters' discounts or commissions) of less than $1,000,000; (iii) if the
Company shall furnish to the Holders a certificate signed by the President of
the Company stating that in the good faith judgment of the Board of Directors
of the Company, it would be seriously detrimental to the Company and its
stockholders for such Form S-3 Registration to be effected at such time, in
which event the Company shall have the right to defer the filing of the Form
S-3 Registration Statement for a period of not more than 60 days after receipt
of the request of the Holder or Holders under this Section 7.12; provided,
however, that the Company shall not utilize this right more than once in any 12
month period; (iv) if the Company has, within the 12 month period preceding the
date of such request, already effected one registration on Form S-3 for the
Holders pursuant to this Section 7.12; (v) if the Company has, within the
preceding 180 days, effected any other registration of its securities; or (vi)
in any particular jurisdiction in which the Company would be required to
qualify to do business or to execute a general consent to service of process in
effecting such registration, qualification or compliance.

                 (c)  Subject to the foregoing, the Company shall file a
registration statement covering the Registrable Securities and other securities
so requested to be registered as soon as practicable after receipt of the
request or requests of the Holders.  All expenses other than underwriting
discounts and commissions incurred in connection with a registration requested
pursuant to Section 7.12, including (without limitation) all registration,
filing, qualification, printer's and accounting fees and the reasonable fees
and disbursements of counsel for the selling Holder or Holders and counsel for
the Company, shall be borne by the Company.  Registrations effected pursuant to
this Section 7.12 shall not be counted as demands for registration effected
pursuant to Section 7.2.

                 7.13  Assignment of Registration Rights.  The rights to cause
the Company to register Registrable Securities pursuant to this Section 7 may
be assigned by a purchaser of Registrable Securities under this Agreement to a
transferee or assignee of an amount of such securities representing at least
50% of the aggregate number of shares of Registrable Securities of such





                                      -28-
<PAGE>   29
purchaser or to a partner or retired partner of such purchaser; provided, that
such transferee or assignee is approved by the Board of Directors of the
Company, which approval shall not be unreasonably withheld, and that the
Company is, within a reasonable time after such approved transfer, furnished
with written notice of the name and address of such transferee or assignee and
the securities with respect to which such registration rights are being
assigned; and provided, further, that such assignment shall be effective only
if immediately following such transfer the further disposition of such
securities by the approved transferee or assignee is restricted under the
Securities Act.

                 7.14  Limitations on Subsequent Registration Rights.  From and
after the date of this Agreement, the Company shall not, without the prior
written consent of the Holders of a majority of the outstanding Registrable
Securities, enter into any agreement with any holder or prospective holder of
any securities of the Company which would allow such holder or prospective
holder (a) to include such securities in any registration filed under Section
7.2 hereof, unless under the terms of such agreement, such holder or
prospective holder may include such securities in any such registration only to
the extent that the inclusion of his securities will not reduce the amount of
the Registrable Securities of the Holders which is included or (b) to make a
demand registration which could result in such registration statement being
declared effective prior to the earlier of either of the dates set forth in
subsection 7.2(a) or within 120 days of the effective date of any registration
effected pursuant to Section 7.2.

                 7.15  "Market Stand-Off" Agreement.  Each Investor hereby
agrees that it shall not, to the extent requested by the Company and an
underwriter of Common Stock (or other securities) of the Company, sell or
otherwise transfer or dispose (other than to donees who agree to be similarly
bound) of any Registrable Securities during the 120-day period following the
effective date of a registration statement of the Company filed under the
Securities Act; provided, however, that:

                 (a)  such agreement shall be applicable only to the first such
registration statement of the Company which covers shares (or securities) to be
sold on its behalf to the public in an underwritten offering; and

                 (b)  all officers and directors of the Company and all other
persons with registration rights (whether or not pursuant to this Agreement)
enter into similar agreements.

                 In order to enforce the foregoing covenant, the Company may
impose stop-transfer instructions with respect to the Registrable Securities of
each Investor (and the shares or securities of every other person subject to
the foregoing restriction) until the end of such 120-day period.





                                      -29-
<PAGE>   30
                 7.16  Amendment of Registration Rights.  Any provision of this
Section 7 may be amended and the observance thereof may be waived (either
generally or in a particular instance and either retroactively or
prospectively), only with the written consent of the Company and the holders of
a majority of the Registrable Securities; provided that (i) consent of a Major
Investor (as defined in the Stock Purchase Agreement under which such
Registrable Securities were purchased) shall be required for any amendment
which materially increases the obligations of such Major Investor, and (ii)
consent of a majority of the inequitably affected Registrable Securities shall
be required for any waiver of a material right of a Major Investor (as defined
in the Stock Purchase Agreement under which such Registrable Securities were
purchased) which does not apply equally to all Major Investors (as defined in
the Stock Purchase Agreements under which Registrable Securities were
purchased) who hold Registrable Securities.  Any amendment or waiver effected
in accordance with this paragraph shall be binding upon each holder of any
securities purchased under this Agreement at the time outstanding (including
securities into which such securities are convertible), each future holder of
all such securities, and the Company.

                 7.17  Termination of Registration Rights.  The Company's
obligations pursuant to this Section 7 shall terminate seven years from the
date of consummation of the Company's sale of its common stock in a bona fide,
firm commitment underwriting pursuant to a registration statement on Form S-1
under the Securities Act which results in gross offering proceeds to the
Company of more than $7,500,000, the public offering price of which was not
less than $9.00 per share (adjusted to reflect stock dividends, stock splits or
recapitalizations).

                 8.  Covenants.

                 8.1  Delivery of Financial Statements.  The Company shall
deliver to (i) each Investor who holds 100,000 shares of Series D Preferred
Stock (or the securities into which they are convertible) ("Major Investor")
and (ii) each assignee of any Major Investor who acquires 50% of such Major
Investor's Series D Preferred Stock purchased hereunder:

                 (a)  as soon as practicable, but in any event within 90 days
after the end of each fiscal year of the Company, an income statement for such
fiscal year, a balance sheet of the Company as of the end of such year, and a
statement of cash flows for such year, such year-end financial reports to be in
reasonable detail, prepared in accordance with generally accepted accounting
principles ("GAAP"), and audited and certified by independent public
accountants of nationally recognized standing selected by the Company (the
Company will include, upon request, the Company's management letter for such
audited reports); and





                                      -30-
<PAGE>   31
                 (b)  (i)  within 30 days of the end of each month, an
unaudited statement of operations, statement of cash flows and balance sheet
for and as of the end of such month, in reasonable detail; such monthly
statements shall also contain the foregoing information on a year-to-date basis
and shall also compare actual performance to budget;

                 (ii)  At least annually, a comprehensive operating budget for
the next fiscal year forecasting the Company's revenues, expenses and cash
position, prepared on a monthly basis, including balance sheets and sources and
applications of funds statements for such months and, as soon as prepared, any
other budgets or revised budgets prepared by the Company; and

                 (iii)  such other information relating to the financial
condition, business, prospects or corporate affairs of the Company as the
Investor or any such assignee of the Investor may from time to time request,
provided, however, that the Company shall not be obligated to provide
information which it deems in good faith to be proprietary; and

                 (c)  with respect to the financial statements called for in
subsection (b)(i) of this Section 8.1, an instrument executed by the Treasurer
or the President of the Company and certifying that such financials were
prepared in accordance with internally consistent accounting methods
consistently applied with prior practice for earlier periods and fairly present
the financial condition of the Company and its results of operation for the
period specified, subject to year-end audit adjustment.  For purposes of this
Section 8, a Major Investor includes affiliated investing entities of that
Investor.

                 8.2  Inspection.  The Company shall permit each Investor, at
such Investor's expense, to visit and inspect the Company's properties, to
examine its books of account and records and to discuss the Company's affairs,
finances and accounts with its officers, all at such reasonable times as may be
requested by the Investor; provided, however, that the Company shall not be
obligated pursuant to this Section 8.2 to provide access to any information
which it reasonably considers to be a trade secret or similar confidential or
proprietary information.

                 8.3  Termination of Covenants.  The covenants set forth in
Sections 8.1, 8.2 and 8.5 shall terminate and be of no further force or effect
when the sale of securities pursuant to a registration statement filed by the
Company under the Securities Act in connection with the firm commitment
underwritten offering of its securities to the general public is consummated or
when the Company first becomes subject to the periodic reporting requirements
of Section 13(a) or 15(d) of the Exchange Act, whichever event shall first
occur; provided that the Company shall furnish to each Major Investor (as
defined in Section 8.4) copies of its reports on Forms 10-K and 10-Q within 10
days after filing with the SEC.





                                      -31-
<PAGE>   32
                 8.4  Right of First Offer.  Subject to the terms and
conditions specified in this Section 8.4, the Company hereby grants to each
Major Investor a right of first offer with respect to future sales by the
Company of its Shares (as hereinafter defined).  For purposes of this Section
8.4, a "Major Investor" includes any partners or affiliates of that Investor.
A Major Investor shall be entitled to apportion the right of first offer hereby
granted it among itself and its partners and affiliates in such proportions as
it deems appropriate.

                 Each time the Company proposes to offer any shares of, or
securities convertible into or exercisable for, any class of its capital stock
("Shares"), the Company shall first make an offering of such Shares to each
Major Investor in accordance with the following provisions:

                 (a)  The Company shall deliver a notice by certified mail
("Notice") to the Major Investors stating (i) its bona fide intention to offer
or issue such Shares, (ii) the number of such Shares to be offered, and (iii)
the price, if any, for which it proposes to offer such Shares.

                 (b)  Within 20 calendar days after receipt of the Notice, the
Major Investor may elect to purchase or obtain, at the price and on the terms
specified in the Notice, up to that portion of such Shares which equals the
proportion that the number of shares of Common Stock issuable (or issued and
held) upon conversion of the Series D Preferred Stock then held, by such Major
Investor bears to the total number of shares of outstanding Common Stock and
Common Stock issuable upon conversion of the Preferred Stock then outstanding.
The Company shall promptly, in writing, inform each Major Investor which
purchases all the shares available to it ("Fully Exercising Investor") of any
other Major Investor's failure to do likewise.  During the 10-day period
commencing after receipt of such information, each Fully Exercising Investor
shall be entitled to obtain that portion of the shares subject to such right of
first refusal and not subscribed for by the Major Investors which is equal to
the proportion that the number of shares of Common Stock issuable (or issued
and held) upon conversion of the Series D Preferred Stock then held by such
Fully Exercising Investor bears to the total number of shares of Common Stock
issuable (or issued and held) upon conversion of the Series D Preferred Stock
then held by all Fully Exercising Investors who wish to purchase some of the
unsubscribed shares.

                 (c)  If all such Shares referred to in the Notice are not
elected to be obtained as provided in subsection 8.4(b) hereof, the Company
may, during the 60 day period following the expiration of the period provided
in subsection 8.4(b) hereof, offer the remaining unsubscribed Shares to any
person or persons at a price not less than that, and upon terms no more
favorable to the offeree than those, specified in the Notice.  If the





                                      -32-
<PAGE>   33
Company does not enter into an agreement for the sale of the Shares within such
period, or if such agreement is not consummated within 60 days of the execution
thereof, the right provided hereunder shall be deemed to be revived and such
Shares shall not be offered unless first reoffered to the Major Investors in
accordance herewith.

                 (d)  The right of first offer granted in this Section 8.4
shall not be applicable (i) to the issuance or sale of shares of Common Stock
(or options therefor), to employees, directors, consultants or advisors of the
Company, provided each such person executes an agreement, in substantially the
form as approved by the Company's Board of Directors, (ii) shares offered in
the acquisition of another company, to strategic partners of the Company or to
companies with business relationships with the Company or in connection with
research and development partnerships sponsored by the Company, or (iii) to or
after consummation of a bona fide, firmly underwritten public offering of
shares of the Company's Common Stock registered under the Securities Act
pursuant to a registration statement on Form S-1, which results in gross
proceeds to the Company of more than $7,500,000 at a price per share of at
least $9.00 (adjusted for any stock splits, stock dividends or other
recapitalizations).

                 8.5  Issuance of Debt.  The Company shall not borrow in excess
of $250,000 annually without the approval of the Company's Board of Directors,
including the approval of a majority of Directors who represent the Investors
hereunder.

                 9.  Miscellaneous.

                 9.1  Survival of Warranties.  The warranties, representations
and covenants of the Company contained in or made pursuant to this Agreement
shall survive the execution and delivery of this Agreement and the Closing and
shall in no way be affected by any investigation of the subject matter thereof
made by or on behalf of the Investors.

                 9.2  Successors and Assigns.  The terms and conditions of this
Agreement shall inure to the benefit of and be binding upon the respective
successors and assigns of the parties.  Nothing in this Agreement, express or
implied, is intended to confer upon any party other than the parties hereto or
their respective successors and assigns any rights, remedies, obligations, or
liabilities under or by reason of this Agreement, except as expressly provided
in this Agreement.

                 9.3  Governing Law.  This Agreement shall be governed by and
construed in accordance with the laws of the State of California except as it
regards choice of law.

                 9.4  Counterparts.  This Agreement may be executed in two or
more counterparts, each of which shall be deemed an





                                      -33-
<PAGE>   34
original, but all of which together shall constitute one and the same
instrument.

                 9.5  Titles and Subtitles.  The titles and subtitles used in
this Agreement are used for convenience only and are not to be considered in
construing or interpreting this Agreement.

                 9.6  Notices.  Unless otherwise provided, any notice required
or permitted under this Agreement shall be given in writing and shall be deemed
effectively given upon personal delivery to the party to be notified or upon
deposit with the United States Post Office, by registered or certified mail,
postage prepaid and addressed to the party to be notified at the address
indicated for such party on the signature page hereof, or at such other address
as such party may designate by 10 days' advance written notice to the other
parties.

                 9.7  Finder's Fee.  Each party represents that it neither is
nor will be obligated for any finder's fee or commission in connection with
this transaction.  Each Investor agrees to indemnify and hold harmless the
Company from any liability for any commission or compensation in the nature of
a finder's fee (and the costs and expenses of defending against such liability
or asserted liability) for which the Investor or any of its officers, partners,
employees or representatives is responsible.

                 The Company agrees to indemnify and hold harmless each
Investor from any liability for any commission or compensation in the nature of
a finder's fee (and the costs and expenses of defending against such liability
or asserted liability) for which the Company or any of its officers, employees
or representatives is responsible.

                 9.8  Expenses.  Irrespective of whether the Closing is
effected, the Company shall pay all costs and expenses that it incurs with
respect to the negotiation, execution, delivery and performance of this
Agreement.  If the Closing is effected, the Company shall reimburse the
Investors no more than $10,000 for the reasonable fees and expenses of the law
firm of Wilson, Sonsini, Goodrich & Rosati, counsel to the Investors.  If any
action at law or in equity is necessary to enforce or interpret the terms of
this Agreement or the Restated Certificate, the prevailing party shall be
entitled to reasonable attorney's fees, costs and necessary disbursements in
addition to any other relief to which such party may be entitled.

                 9.9  Amendments and Waivers.  Any term of this Agreement may
be amended and the observance of any term of this Agreement may be waived
(either generally or in a particular instance and either retroactively or
prospectively), only with the written consent of the Company and the holders of
a majority of the Common Stock issued or issuable upon conversion of the Series
D Preferred Stock purchased by the Investors pursuant to





                                      -34-
<PAGE>   35
this Agreement, except: (i) as specified in Section 7.16, and (ii) no amendment
shall increase the price of the Series D Preferred Stock without the consent of
all Investors, and any material amendment or waiver which does not apply
equally to all Major Investors shall not be effective unless it has been
consented to or approved in writing by a majority of the inequitably affected
Major Investors.  Any amendment or waiver effected in accordance with this
paragraph shall be binding upon each holder of any securities purchased under
this Agreement at the time outstanding (including securities into which such
securities are convertible), each future holder of all such securities, and the
Company; provided, however, that no condition set forth in Section 5 hereof may
be waived with respect to any Investor who does not consent thereto.

                 9.10  Severability.  If one or more provisions of this
Agreement are held to be unenforceable under applicable law, such provision
shall be excluded from this Agreement and the balance of this Agreement shall
be interpreted as if such provision were so excluded and shall be enforceable
in accordance with its terms.

                 9.11  Aggregation of Stock.  All shares of Series D Preferred
Stock held or acquired by affiliated entities or persons shall be aggregated
together for the purpose of determining the availability of any rights under
this Agreement.

                 9.12  Amendment to Series A, Series B and Series C
Registration Rights.  Pursuant to Section 7.16 of the Series A Agreement,
Section 7.16 of the Series B Agreement and Section 7.16 of the Series C
Agreement, the Company and the holders of Series A Preferred Stock purchased
under the Series A Agreement, the holders of Series B Preferred Stock purchased
under the Series B Agreement and the holders of the Series C Preferred Stock
purchased under the Series C Agreement hereby consent to the deletion of
Section 7 of the Series A Agreement in its entirety, the deletion of Section 7
of the Series B Agreement in its entirety and the deletion of Section 7 of the
Series C Agreement in its entirety effective upon the Closing and thereafter
the registration rights applicable to the Common Stock issuable or issued upon
conversion of the Series A Preferred Stock, Series B Preferred Stock and Series
C Preferred Stock, and any Common Stock of the Company issued (or issuable upon
the conversion or exercise of any warrant, right or other security which is
issued) as a dividend or other distribution with respect to, in exchange for,
or in replacement of, such Series A Preferred Stock, Series B Preferred Stock
and Series C Preferred Stock (excluding in all cases, however, any Registrable
Securities sold by a person in a transaction in which his rights under Section
7 are not assigned), shall be determined solely under Section 7 hereof.

           9.13  Waiver of Right of First Offer.  Pursuant to Section 9.9 of the





                                      -35-
<PAGE>   36
Series A Agreement, Section 9.9 of the Series B Agreement and Section 9.9 of
the Series C Agreement, the holders of Series A Preferred Stock purchased under
the Series A Agreement, the holders of Series B Preferred Stock purchased under
the Series B Agreement and the holders of the Series C Preferred Stock
purchased under the Series C Agreement hereby waive the rights of first offer
of the Series A Holders, the Series B Holders and the Series C Holders,
respectively, under the Series A Agreement, the Series B Agreement and the
Series C Agreement to the purchase and sale of Series D Preferred Stock and the
issuance of Common Stock thereof, except to the extent of such holders'
purchase of shares hereunder.


                 IN WITNESS WHEREOF,  the parties have executed this Agreement
as of the date first above written.

                                                     
                                                     
                                       BIOSITE DIAGNOSTICS INCORPORATED



                                       By /s/ Kim D. Blickenstaff
                                          ______________________________

                       Address:        11030 Roselle Street, Suite D
                                       San Diego, CA 92121


                                       INVESTORS:


                                       CHC Venture Co.



                                       By  /s/ Timothy J. Wollaeger
                                           _____________________________

                                       Title         President
                                             __________________________

                       Address:        c/o Sutter Corporation
                                       9425 Chesapeake Drive
                                       San Diego, CA 92123
                                       Attn:  Timothy J. Wollaeger

                                       SENTRON MEDICAL, INC.



                                       By  /s/  Vincent M. Paglino
                                           ______________________________
                                                Vincent M. Paglino
                                                  Vice President

                       Address:        c/o Senmed Medical Ventures
                                       4445 Lake Forest Drive, Suite 600
                                       Cincinnati, OH 45242






                                      -36-
<PAGE>   37
                                       MEDICUS VENTURE PARTNERS 1991 A 
                                       CALIFORNIA LIMITED PARTNERSHIP

                                       By MEDICUS MANAGEMENT PARTNERS,
                                          General Partner



                                          By /s/ Frederick J. Dotzler
                                             ___________________________
                                                Frederick J. Dotzler
                                                   General Partner

                       Address:        2180 Sand Hill Road, Suite 400
                                       Menlo Park, CA 94025


                                       KLEINER PERKINS CAUFIELD &
                                       BYERS V, A CALIFORNIA LIMITED
                                       PARTNERSHIP

                                       By KPCB V ASSOCIATES, A CALIFORNIA
                                       LIMITED PARTNERSHIP, its
                                       General Partner



                                       By /s/ Brook H. Byers
                                          ______________________________
                                               Brook H. Byers

                       Address:        Four Embarcadero Center
                                       Suite 3520
                                       San Francisco, CA 94111
                                       EUCLID PARTNERS III, L.P., A
                                       DELAWARE LIMITED PARTNERSHIP

                                       By   EUCLID ASSOCIATES III, L.P.
                                            A DELAWARE LIMITED PARTNERSHIP,
                                            General Partner



                                       By /s/ Stephen K. Reidy
                                          ______________________________
                                                Stephen K. Reidy
                                                 General Partner

                       Address:        Euclid Partners Corporation
                                       50 Rockefeller Plaza, Suite 1022
                                       New York, NY 10020

                                       DOMAIN PARTNERS, L.P.

                                       By   One Palmer Square Associates,
                                       L.P.






                                      -37-
<PAGE>   38
                        Biosite Diagnostics Incorporated
                            Series D Preferred Stock
                           Counterpart Signature Page




                                       By /s/ Jesse Treu
                                          ______________________________
                                                    Jesse Treu
                                                  General Partner

                       Address:        Domain Associates
                                       One Palmer Square
                                       Princeton, NJ 08542


                                       BIOTECHNOLOGY INVESTMENTS LIMITED

                                       By   N. M. ROTHSCHILD AND SONS
                                            (C.I.) LIMITED



                                       By /s/ Jesse Treu
                                           _______________________________
                                                   Jesse Treu
                                                 Attorney in Fact

                       Address:        P. O. Box 58
                                       St. Julian's Court
                                       St. Peter Port
                                       Guernsey
                                       Channel Islands




                                        /s/ Peter Preuss
                                       _______________________________
                                                 Peter Preuss

                       Address:        The Preuss Foundation
                                       201 Lomas Santa Fe Drive
                                       Suite 340
                                       Solana Beach, CA 92075






                                      -38-
<PAGE>   39
                        Biosite Diagnostics Incorporated
                            Series D Preferred Stock
                           Counterpart Signature Page


                                       
                                    /s/ Harris Kaplan          
                                   __________________________________
                                             Harris Kaplan


                   Address:        1802 Bywood Lane
                                   Stevenson, MD 21153

                                   STANFORD UNIVERSITY

                                                
                                   By /s/ Carol Gilmer
                                      _______________________________
                 
                                   Title  Assistant Secretary,
                                          Board of Trustees
                                          ___________________________

                    Address:        c/o Stanford Management Company
                                    2770 Sand Hill Road
                                    Menlo Park, Ca 94025
                                    Attn:  Ms. Carol Gilmer

                                     /s/ D. Jim Grellas
                                    __________________________________
                                                D. Jim Grellas

                    Address:        c/o Sutter Corporation
                                    3350 Scott Boulevard #52
                                    Santa Clara, CA 95054

                                    /s/ Karen Grellas
                                    __________________________________
                                              Karen Grellas

                    Address:        c/o Sutter Corporation
                                    3350 Scott Boulevard #52
                                    Santa Clara, CA 95054


                                     /s/ Timothy J. Wollaeger
                                    __________________________________
                                          Timothy J. Wollaeger

                    Address:        c/o Sutter Corporation
                                    9425 Chesapeake Drive
                                    San Diego, CA 92123-1302





                                      -39-
<PAGE>   40
                        Biosite Diagnostics Incorporated
                            Series D Preferred Stock
                           Counterpart Signature Page


                                        /s/ Daniel P. Wollaeger
                                       __________________________________
                                               Daniel P. Wollaeger

                       Address:        210 Sylvester
                                       St. Louis, MO  63119

                                        /s/ Robert E. Zarwell
                                       __________________________________
                                                Robert E. Zarwell

                       Address:        c/o Pen Station
                                       11661 West Bluemound Road
                                       Milwaukee, WI 53226


                                        /s/ Sarah A. Zarwell
                                       __________________________________
                                                 Sarah A. Zarwell

                       Address:        c/o Pen Station
                                       11661 West Bluemound Road
                                       Milwaukee, WI 53226


                                        /s/ R. Putnam Kingsbury
                                       __________________________________
                                               R. Putnam Kingsbury

                       Address:        674 West Street
                                       Keene, NH 03431


                                        /s/ Thomas W. Kintner
                                       __________________________________
                                                Thomas W. Kintner

                       Address:        1663 Bush Street
                                       San Francisco, CA 94109

                                        /s/ Kim D. Blickenstaff
                                       __________________________________
                                               Kim D. Blickenstaff

                       Address:        c/o Biosite Diagnostics Inc.
                                       11030 Roselle Street, Suite D
                                       San Diego, CA 92121






                                      -40-
<PAGE>   41
                        Biosite Diagnostics Incorporated
                            Series D Preferred Stock
                           Counterpart Signature Page




                                       THE VALKIRS FAMILY TRUST



                                       By     /s/ Gunars E. Valkirs
                                          _____________________________
                                            Gunars E. Valkirs, Trustee

                       Address:        c/o Biosite Diagnostics Inc.
                                       11030 Roselle Street, Suite D
                                       San Diego, CA 92121              
                        
                                             /s/ Charles Patrick
                                       _________________________________
                                               Charles Patrick

                       Address:        c/o Biosite Diagnostics Inc.
                                       11030 Roselle Street, Suite D
                                       San Diego, CA 92121

                                            /s/ Richard Anderson
                                       _________________________________
                                              Richard Anderson

                       Address:        c/o Biosite Diagnostics Inc.
                                       11030 Roselle Street, Suite D
                                       San Diego, CA 92121


                                              /s/ Kenneth Buechler
                                       _________________________________
                                                Kenneth Buechler

                       Address:        c/o Biosite Diagnostics Inc.
                                       11030 Roselle Street, Suite D
                                       San Diego, CA 92121

                                              /s/ S. Nicholas Stiso
                                       _________________________________
                                                S. Nicholas Stiso

                       Address:        c/o Biosite Diagnostics Inc.
                                       11030 Roselle Street, Suite D
                                       San Diego, CA 92121





                                      -41-
<PAGE>   42
                        Biosite Diagnostics Incorporated
                            Series D Preferred Stock
                           Counterpart Signature Page


The undersigned hereby agree to the terms and provisions of Sections 9.12 and
9.13 hereof.

                                                     
                                                     
                                       BIOVEST PARTNERS

                                       By   Biovest Associates,
                                            A California Limited
                                            Partnership



                                       By /s/ Timothy J. Wollaeger 
                                       ___________________________
                                            Timothy J. Wollaeger
                                               General Partner

                       Address:        c/o Timothy J. Wollaeger
                                       Sutter Corporation
                                       9425 Chesapeake Drive
                                       San Diego, CA 92123-1302


                                       MEDICUS VENTURE PARTNERS 1989
                                       A CALIFORNIA LIMITED PARTNERSHIP

                                       By MEDICUS MANAGEMENT PARTNERS,
                                          General Partner



                                       By /s/ Frederick J. Dotzler
                                           ___________________________
                                              Frederick J. Dotzler
                                                General Partner

                       Address:        2180 Sand Hill Road, Suite 400
                                       Menlo Park, CA 94025


                                       MEDICUS VENTURE PARTNERS 1990
                                       A CALIFORNIA LIMITED PARTNERSHIP

                                       By MEDICUS MANAGEMENT PARTNERS,
                                          General Partner



                                       By /s/ Frederick J. Dotzler
                                          ___________________________
                                             Frederick J. Dotzler
                                                General Partner

                       Address:        2180 Sand Hill Road, Suite 400




                              Menlo Park, CA 94025








                                      -42-
<PAGE>   43

<PAGE>   44
                                   SCHEDULE A

                        BIOSITE DIAGNOSTICS INCORPORATED

                            SERIES D PREFERRED STOCK


<TABLE>
<CAPTION>
Investors                                                                   Shares                 Amount
- ---------                                                                   ------                 ------
<S>                                                                      <C>                     <C>
CHC Venture Co.                                                            500,000               $1,500,000
Sentron Medical Inc.                                                       333,334                1,000,002
Medicus Venture Partners 1991                                              333,334                1,000,002
Kleiner Perkins Caufield & Byers V                                         333,334                1,000,002
Euclid Partners III, L.P.                                                  166,667                  500,001
Domain Partners, L.P.                                                       16,667                   50,001
Biotechnology Investments Ltd.                                             116,667                  350,001
Peter Preuss                                                                33,334                  100,002
Harris Kaplan                                                                8,334                   25,002
Stanford Management Company                                                  3,334                   10,002
D. Jim & Karen Grellas                                                       6,667                   20,001
Timothy J. Wollaeger                                                         1,667                    5,001
Daniel P. Wollaeger                                                          1,667                    5,001
Robert & Sarah A. Zarwell                                                    1,667                    5,001
Thomas W. Kintner                                                            1,667                    5,001
Kim D. Blickenstaff                                                          6,667                   20,001
Valkirs Family Trust                                                        13,334                   40,002
Charles Patrick                                                              3,334                   10,002
Richard Anderson                                                             3,334                   10,002
Kenneth Buechler                                                             8,334                   25,002
S. Nicholas Stiso                                                            5,000                   15,000
                                                                             -----                   ------

                                                                         1,898,343               $5,695,029
                                                                         =========               ==========
</TABLE>






<PAGE>   1

                                                                  Exhibit 10.18



                            STOCK PURCHASE AGREEMENT


                 THIS STOCK PURCHASE AGREEMENT (the "Agreement") is made as of
the 25th day of November, 1992 by and between BIOSITE DIAGNOSTICS INCORPORATED,
a Delaware corporation (the "Company"), and the investors listed on Schedule A
hereto, each of which is herein referred to as an "Investor."

                 THE PARTIES HEREBY AGREE AS FOLLOWS:

                 1.  Purchase and Sale of Stock.

                 1.1  Sale and Issuance of Series E Preferred Stock.

                 (a)  The Company shall adopt and file with the Secretary of
State of the State of Delaware on or before the first Closing (as defined
below) the Restated Certificate of Incorporation in the form attached hereto as
Exhibit A (the "Restated Certificate").

                 (b)  Subject to the terms and conditions of this Agreement,
each Investor agrees, severally, to purchase at the Closing and the Company
agrees to sell and issue to each Investor at the Closing that number of shares
of the Company's Series E Preferred Stock set forth opposite such Investor's
name on Schedule A hereto for the purchase price of $4.80 per share payable in
cash or cancelation of indebtedness.

                 (c)      The Company may sell authorized but unissued shares
of Series E Preferred Stock not sold at the Closing referred to in Section 1.2
below at one or more additional closings to any purchaser who makes the
representations set forth in Section 3.8 hereof at a price of $4.80 per share
payable in cash or cancelation of indebtedness, provided that the agreements
with respect to such sales are executed not later than December 15, 1992 and
provided further that the terms and conditions in such agreement are no more
favorable to such purchaser than those contained in this Agreement.  Any such
purchaser shall be deemed to be an Investor for purposes of this Agreement, and
the shares so sold shall be deemed to have been acquired hereunder.

                 1.2  Closing.  A purchase and sale of the Series E Preferred
Stock shall take place at the offices of Pillsbury Madison & Sutro, 235
Montgomery Street, San Francisco, California, at 10:00 A.M., on November 25,
1992 or at such other time and place as the Company and Investors acquiring in
the aggregate more than half the shares of Series E Preferred Stock sold at
such time and place pursuant hereto mutually agree upon (verbally or in
writing) (which time and place are designated as the "Closing").  At the
Closing the Company shall deliver to




                                       -1-
<PAGE>   2
each Investor a certificate representing the Series E Preferred Stock which
such Investor is purchasing against delivery to the Company by such Investor of
a bank check or bank wire in the amount of the purchase price therefor payable
to the Company's order or by delivery of evidences of indebtedness of the
Company for cancellation by the Company.

                 2.  Representations and Warranties of the Company.  The
Company hereby represents and warrants to each Investor that, except as set
forth on the Schedule of Exceptions furnished to each Investor and specifically
identifying the relevant subparagraph hereof, which exceptions shall be deemed
to be representations and warranties as if made hereunder:

                 2.1  Organization, Good Standing and Qualification.  The
Company is a corporation duly organized, validly existing and in good standing
under the laws of the State of Delaware and has all requisite corporate power
and authority to carry on its business as now conducted and as proposed to be
conducted.  The Company is duly qualified to transact business and is in good
standing in each jurisdiction in which the failure to so qualify would have a
material adverse effect on its business or properties.

                 2.2  Capitalization.  The authorized capital of the Company
                   consists, or will consist prior to the Closing, of:

                 (i)  Preferred Stock.  8,328,847 shares of preferred stock
         (the "Preferred Stock"), 610,000 shares of which have been designated
         Series A Preferred Stock, par value $.01 per share (the "Series A
         Preferred Stock"), 2,156,336 shares of which have been designated
         Series B Preferred Stock, par value $.01 per share (the "Series B
         Preferred Stock"), 2,204,167 shares of which have been designated
         Series C Preferred Stock, par value $.01 per share (the "Series C
         Preferred Stock"), 1,900,010 shares of which have been designated
         Series D Preferred Stock, par value $.01 per share (the "Series D
         Preferred Stock") and 1,458,334 shares of which have been designated
         Series E Preferred Stock, par value $.01 per share (the "Series E
         Preferred Stock").  There are 610,000 shares of Series A Preferred
         Stock, 2,156,336 shares of Series B Preferred Stock, 2,204,167 shares
         of Series C Preferred Stock and 1,900,010 shares of Series D Preferred
         Stock issued and outstanding and, based upon the Company's records,
         such outstanding shares of Series A Preferred Stock, Series B
         Preferred Stock, Series C Preferred Stock and Series D Preferred Stock
         are owned by the persons and in the numbers specified in the
         stockholder list made available supplementally to the Investors upon
         request.  The rights, preferences and privileges of the Series A
         Preferred Stock, Series B Preferred Stock, Series C





                                      -2-
<PAGE>   3
         Preferred Stock, Series D Preferred Stock and Series E Preferred Stock
         are or as of the Closing will be as stated in the Company's Restated
         Certificate.

                 (ii)  Common Stock.  12,000,000 shares of common stock (the
         "Common Stock"), of which 1,138,069 shares are issued and outstanding
         and, based upon the Company's records, are owned by the persons, and
         in the numbers specified in the stockholder list provided
         supplementally to the Investors.

                 (iii)  Agreements for Purchase of Shares.  Except for (a) the
         conversion privileges of the Series A Preferred Stock, the Series B
         Preferred Stock, the Series C Preferred Stock, the Series D Preferred
         Stock and the Series E Preferred Stock, (b) the right of first offer
         of the Investors provided in Section 8.4 hereof, (c) the right of
         first offer provided for in Section 8.4 of the Series A Preferred
         Stock Purchase Agreement dated as of May 5, 1988 between the Company
         and the investors listed therein (the "Series A Agreement"), (d) the
         right of first offer provided for in Section 8.4 of the Series B
         Preferred Stock Purchase Agreement dated as of July 24, 1989 between
         the Company and the investors listed therein (the "Series B
         Agreement"), (e) the right of first offer provided for in Section 8.4
         of the Series C Preferred Stock Purchase Agreement dated as of June 7,
         1990 between the Company and the investors listed therein (the "Series
         C Agreement"), (f) the right of first offer provided for in Section
         8.4 of the Series D Preferred Stock Purchase Agreement, dated as of
         October 30, 1991 between the Company and the investors listed therein
         (and the supplemental signature pages thereto)(the "Series D
         Agreement") and (g) Options to Purchase an aggregate of 408,250 shares
         of Common Stock granted pursuant to the Amended and Restated 1989
         Stock Plan of the Company (the "Plan"), there are no outstanding
         options, warrants, rights (including conversion or preemptive rights)
         or agreements for the purchase or acquisition from the Company of any
         shares of its capital stock.

                 2.3  Subsidiaries.  Except for Biosite Diagnostics GmbH, its
wholly owned subsidiary, the Company does not presently own or control,
directly or indirectly, any interest in any other corporation, association,
partnership or other business entity.

                 2.4  Authorization.  All corporate action on the part of the
Company, its officers, directors and stockholders necessary for the
authorization, execution and delivery of this Agreement, the performance of all
obligations of the Company hereunder and the authorization, issuance (or
reservation for





                                      -3-
<PAGE>   4
issuance) and delivery of the Series E Preferred Stock being sold hereunder and
the Common Stock issuable upon conversion of the Series E Preferred Stock, to
the extent that the foregoing requires performance on or prior to the Closing,
has been taken or will be taken on or prior to the Closing, and this Agreement
constitutes a valid and legally binding obligation of the Company enforceable
in accordance with its terms.

                 2.5  Valid Issuance of Preferred and Common Stock.

                 (a)  The Series E Preferred Stock which is being purchased by
the Investors hereunder, when issued, delivered and paid for in accordance with
the terms hereof for the consideration expressed herein, will be duly and
validly authorized and issued, fully paid and nonassessable and, based in part
upon the representations of the Investors in this Agreement, will be issued in
compliance with all applicable federal and state securities laws.  The Common
Stock issuable upon conversion of the Series E Preferred Stock purchased under
this Agreement has been or will be on or prior to the Closing, duly and validly
reserved for issuance and, upon issuance, will be duly and validly issued,
fully paid and nonassessable.

                 (b)  The outstanding shares of Common Stock, Series A
Preferred Stock, Series B Preferred Stock, Series C Preferred Stock and Series
D Preferred Stock are duly and validly authorized and issued, fully paid and
nonassessable, and were issued in compliance with federal and state securities
laws.

                 2.6  Governmental Consents.  No consent, approval, order or
authorization of, or registration, qualification, designation, declaration or
filing with, any federal, state, local or provincial governmental authority on
the part of the Company is required in connection with the consummation of the
transactions contemplated by this Agreement, except for the filing pursuant to
section 25102(f) of the California Corporate Securities Law of 1968, as
amended, and the rules thereunder, and any other post-sale filings pursuant to
applicable state securities laws, which filings will be effected prior to any
applicable deadlines.

                 2.7  Litigation.  There is no action, suit, proceeding or
investigation pending or currently threatened against the Company which
questions the validity of this Agreement or the right of the Company to enter
into it, or to consummate the transactions contemplated hereby, or which might
result, either individually or in the aggregate, in any material adverse change
in the assets, condition, affairs or prospects of the Company, financially or
otherwise, or any change in the current equity ownership of the Company, nor is
the Company aware that there is any basis for the foregoing.  The foregoing
includes, without limitation, actions pending or threatened (or any basis
therefor known to the Company) involving the prior employment of any of the
Company's employees, their use in connection with the





                                      -4-
<PAGE>   5
Company's business of any information or techniques allegedly proprietary to
any of their former employers, or their obligations under any agreements with
prior employers.  The Company is not a party or subject to the provisions of
any order, writ, injunction, judgment or decree of any court or government
agency or instrumentality.  There is no action, suit, proceeding or
investigation by the Company currently pending or which the Company intends to
initiate.

                 2.8  Invention and Secrecy and Common Stock Purchase
Agreements.  Each key employee of the Company has executed an Employee's
Invention and Proprietary Information Agreement in substantially the form made
available to the Investors upon request.  The Company, after reasonable
investigation, is not aware that any of its key employees are in violation
thereof, and the Company will use its best efforts to prevent any such
violation.  Each holder of Common Stock of the Company has entered into a
Common Stock Purchase Agreement in substantially the form made available to the
Investors upon request.

                 2.9  Patents and Trademarks.  The Company has sufficient title
and ownership of all patents, trademarks, service marks, trade names,
copyrights, trade secrets, information, proprietary rights and processes
necessary for its business as now conducted and as proposed to be conducted
without any conflict with or infringement of the rights of others.  There are
no outstanding options, licenses or agreements of any kind relating to the
foregoing, nor is the Company bound by or a party to any options, licenses or
agreements of any kind with respect to the patents, trademarks, service marks,
trade names, copyrights, trade secrets, licenses, information, proprietary
rights and processes of any other person or entity.  The Company has not
received any communications alleging that the Company has violated or, by
conducting its business as proposed, would violate any of the patents,
trademarks, service marks, trade names, copyrights or trade secrets or other
proprietary rights of any other person or entity.  The Company is not aware
that any of its employees is obligated under any contract (including licenses,
covenants or commitments of any nature) or other agreement, or subject to any
judgment, decree or order of any court or administrative agency, that would
interfere with the use of his best efforts to promote the interests of the
Company or that would conflict with the Company's business as proposed to be
conducted.  Neither the execution nor delivery of this Agreement, nor the
carrying on of the Company's business by the employees of the Company, nor the
conduct of the Company's business as proposed, will, to the Company's
knowledge, after due inquiry, conflict with or result in a breach of the terms,
conditions or provisions of, or constitute a default under, any contract,
covenant or instrument under which any of such employees is now obligated,
which conflict, breach or default would be materially adverse to the Company.
It is not and it will not be necessary for the Company to utilize any
inventions





                                      -5-
<PAGE>   6
of any of its employees (or people it currently intends to hire) made prior to
their employment by the Company.

                 2.10  Compliance with Other Instruments.  The Company is not
in violation or default of any provisions of its Certificate of Incorporation
or Bylaws, as amended, or of any instrument, judgment, order, writ, decree or
contract to which it is a party or by which it is bound or, to its knowledge,
of any provision of federal or state statute, rule or regulation applicable to
the Company, which violation or default would be materially adverse to the
Company.  The execution, delivery and performance of this Agreement and the
consummation of the transactions contemplated hereby will not result in any
such violation or be in conflict with or constitute, with or without the
passage of time and giving of notice, either a material default under any such
provision, instrument, judgment, order, writ, decree or contract or an event
which results in the creation of any lien, charge or encumbrance upon any
assets of the Company, which violation, default, conflict or event would be
materially adverse to the Company.

                 2.11  Agreements; Action.

                 (a)  Except for the agreements explicitly contemplated hereby,
there are no agreements, understandings or proposed transactions between the
Company and any of its officers, directors, affiliates or any affiliate
thereof.

                 (b)  There are no agreements, understandings, instruments,
contracts or proposed transactions to which the Company is a party or by which
it is bound which involve (i) obligations of, or payments to the Company in
excess of, $100,000, other than liabilities or obligations of the Company for
compensation under employment agreements, (ii) the license of any patent,
copyright, trade secret or other proprietary right of the Company or (iii)
joint venture, partnership or other contract or arrangement involving the
sharing of profits or proprietary information or know how (other than
nondisclosure agreements), (iv) any contract or agreement limiting the
Company's right to engage in any business activity or compete with any person
or entity, or (v) any other material agreement.

                 (c)  The Company has not (i) declared or paid any dividends,
or authorized or made any distribution upon or with respect to any class or
series of its capital stock, (ii) incurred any indebtedness for money borrowed
or incurred any other liabilities individually in excess of $100,000 or in
excess of $200,000 in the aggregate, other than liabilities or obligations of
the Company for compensation under employment agreements, (iii) made any loans
or advances to any person, other than ordinary advances for travel expenses or
(iv) sold, exchanged or otherwise disposed of any of its assets or rights,
other than the sale of its inventory in the ordinary course of business.





                                      -6-
<PAGE>   7
                 (d)  The Company is not a party to and is not bound by any
contract, agreement or instrument, or subject to any restriction under its
Restated Certificate of Incorporation or Bylaws, which adversely affects in any
material respect its business as now conducted or as proposed to be conducted,
its properties or its financial condition.

                 (e)  The Company has not engaged in the past three months in
any discussion (i) with any representative of any corporation or corporations
regarding the consolidation or merger of the Company with or into any such
corporation or corporations, (ii) with any corporation, partnership,
association or other business entity or any individual regarding the sale,
conveyance or disposition of all or substantially all of the assets of the
Company or a transaction or series of related transactions in which more than
50 percent of the voting power of the Company is disposed of, or (iii)
regarding any other form of liquidation, dissolution or winding up of the
Company.

                 2.12  Disclosure.  The Company believes it has fully provided
each Investor with all the information which such Investor has requested for
deciding whether to purchase the Series E Preferred Stock and all information
reasonably necessary to enable such Investor to make such decision.  Neither
this Agreement nor any other statement or certificate made or delivered in
connection herewith contains any untrue statement of a material fact or omits
to state a material fact necessary to make the statements herein or therein not
misleading.

                 2.13  Registration Rights.  Except as provided in Section 7 of
this Agreement, Section 7 of the Series A Agreement, Section 7 of the Series B
Agreement, Section 7 of the Series C Agreement and Section 7 of the Series D
Agreement, the Company has not granted or agreed to grant any registration
rights, including piggy-back rights, to any person or entity.

                 2.14  Corporate Documents.  The Restated Certificate of
Incorporation and Bylaws of the Company are in the form previously made
available to the Investors upon request.

                 2.15  Title to Property and Assets.  The Company owns its
property and assets free and clear of all mortgages, liens, loans and
encumbrances, except such encumbrances and liens which arise in the ordinary
course of business and do not materially impair the Company's ownership or use
of such property or assets.  With respect to the property and assets it leases,
the Company is in compliance with such leases and, to the best of its
knowledge, holds a valid leasehold interest free of any material liens, claims
or encumbrances.  All the Company's personal properties, whether owned or
leased, are in good operating condition, normal wear and tear excepted, and are
adequate and suitable for the purposes for which they are currently being used.





                                      -7-
<PAGE>   8
                 2.16  Employee Benefit Plans.  The Company does not have any
Employee Benefit Plan as described in section 3(2)(A) or section 3(2)(B) of the
Employee Retirement Income Security Act of 1974.

                 2.17  Tax Returns and Payments.  The Company has filed all tax
returns and reports as required by law in a timely fashion.  These returns and
reports are true and correct in all material respects.  The Company has paid
all taxes and other assessments due prior to the time penalties would accrue
thereon.  The provision for taxes of the Company is adequate for taxes due or
accrued as of the date thereof.

                 2.18  Insurance.  The Company has in full force and effect
fire and casualty insurance policies, with extended coverage, sufficient in
amount (subject to reasonable deductibles) to allow it to replace any of its
properties that might be damaged or destroyed.

                 2.19  Minute Books.  The minute books of the Company made
available to the Investors upon request contain a complete summary of all
meetings of directors and stockholders since the time of incorporation and
reflect all transactions referred to in such minutes accurately in all material
respects.

                 2.20  Labor Agreements and Actions.  The Company is not bound
by or subject to (and none of its assets or properties is bound by or subject
to) any written or oral, express or implied, contract, commitment or
arrangement with any labor union, and no labor union has requested or, to the
knowledge of the Company, has sought to represent any of the employees,
representatives or agents of the Company.  There is no strike or other labor
dispute involving the Company pending, or to the knowledge of the Company
threatened, nor is the Company aware of any labor organization activity
involving its employees.  The Company is not aware that any officer or key
employee, or that any group of key employees, intends to terminate their
employment with the Company, nor does the Company have a present intention to
terminate the employment of any of the foregoing.

                 2.21  Real Property Holding Company.  The Company is not a
"United States real property holding corporation" (as that term is defined in
Treasury Regulation section 1.897-2(b)).  Within 45 days after receipt of a
request from a foreign investor, the Company shall prepare and deliver to such
foreign investor the statement required under Treasury Regulation section
1.897-2(h)(1)(i) and either or both of the following documents:  (i) an
affidavit in conformance with the requirements of Internal Revenue Code of
1986, as amended ("IRC") section 1445(b)(3) or (ii) a notarized statement,
executed by an officer having actual knowledge of the facts, that the shares of
Company stock held by such foreign investor are of a class that is regularly
traded on an established securities market, within the meaning of IRC section
1445(b)(6).  If the





                                      -8-
<PAGE>   9
Company is unable to provide either document described in (i) or (ii) above, if
requested, it shall promptly notify such foreign investor in writing of the
reasons for such inability.  Finally, upon the request of a foreign investor
and without regard to whether either document described in (i) or (ii) above
has been requested, the Company shall cooperate fully with the efforts of such
foreign investor to obtain a "qualifying statement," within the meaning of IRC
section 1445(b)(4), or such other documents as would excuse a transferee of a
foreign investor's interest from withholding of income tax imposed pursuant to
IRC section 897(a).

                 2.22  Financial Statements.  The Company has delivered to each
Investor its audited financial statements (balance sheet and profit and loss
statement) at and for the period from inception through December 31, 1991, and
its unaudited interim financial statements at and for the period from January
1, 1992 through September 30, 1992 (the "Financial Statements").  The Financial
Statements are complete and correct in all material respects and have been
prepared in accordance with generally accepted accounting principles applied on
a consistent basis throughout the period indicated and are consistent with each
other.  The Financial Statements accurately set out and describe the financial
condition and operating results of the Company as of the date, and for the
period, indicated therein.  Except as set forth in the Financial Statements,
the Company has no liabilities, contingent or otherwise, other than (i)
liabilities incurred in the ordinary course of business subsequent to September
30, 1992, and (ii) obligations under contracts and commitments incurred in the
ordinary course of business and not required under generally accepted
accounting principles to be reflected in the Financial Statements, which,
individually or in the aggregate, are not material to the financial condition
or operating results of the Company.  The Company maintains and will continue
to maintain a standard system of accounting established and administered in
accordance with generally accepted accounting principles.

                 2.23  Voting Arrangements.  Except as may be provided in
Section 5.6 hereof, to the Company's knowledge there are no outstanding
stockholder agreements, voting trusts, proxies or other arrangements or
understandings among the stockholders of the Company relating to the voting of
their respective shares.

                 3.  Representations, Warranties, Covenants and Agreements of
Each Investor.  Each Investor hereby represents, warrants, covenants and agrees
that:

                 3.1  Authorization.  This Agreement constitutes its valid and
legally binding obligation.

                 3.2  Purchase Entirely for Own Account.  This Agreement is
made with each Investor in reliance upon such Investor's representation to the
Company, which by such Investor's





                                      -9-
<PAGE>   10
execution of this Agreement such Investor hereby confirms, that the Series E
Preferred Stock to be received by such Investor and the Common Stock issuable
upon conversion thereof (collectively, the "Securities") will be acquired for
investment for such Investor's own account, not as a nominee or agent, and not
with a view to the resale or distribution of any part thereof, and that such
Investor has no present intention of selling, granting any participation in, or
otherwise distributing the same.  By executing this Agreement, each Investor
further represents that such Investor does not have any contract, undertaking,
agreement or arrangement with any person to sell, transfer or grant
participations to such person or to any third person, with respect to any of
the Securities.  Each Investor represents that it has full power and authority
to enter into this Agreement.

                 3.3  Disclosure of Information.  Each Investor believes it has
received all the information it considers necessary or appropriate for deciding
whether to purchase the Series E Preferred Stock.  Each Investor further
represents that it has had an opportunity to ask questions and receive answers
from the Company regarding the terms and conditions of the offering of the
Series E Preferred Stock.  The foregoing, however, does not limit or modify the
representations and warranties of the Company in Section 2 of this Agreement.

                 3.4  Investment Experience.  Each Investor is an investor in
securities of companies in the development stage and acknowledges that it is
able to fend for itself, can bear the economic risk of its investment and has
such knowledge and experience in financial or business matters that it is
capable of evaluating the merits and risks of the investment in the Series E
Preferred Stock.  If other than an individual, Investor also represents it has
not been organized solely for the purpose of acquiring the Series E Preferred
Stock.

                 3.5  Restricted Securities.  Each Investor understands that
the shares of Series E Preferred Stock it is purchasing are characterized as
"restricted securities" under the federal securities laws inasmuch as they are
being acquired from the Company in a transaction not involving a public
offering and that under such laws and applicable regulations such securities
may be resold only in certain limited circumstances without registration under
the Securities Act of 1933, as amended (the "Securities Act").  In this
connection each Investor represents that it is familiar with SEC Rule 144, as
presently in effect, and understands the resale limitations imposed thereby and
by the Securities Act.

                 3.6  Further Limitations on Disposition.  Without in any way
limiting the representations set forth above, each Investor further agrees not
to make any disposition of all or any portion of the Series E Preferred Stock
(or the Common Stock issuable upon the conversion thereof) unless and until:





                                      -10-
<PAGE>   11
                 (a)  There is then in effect a Registration Statement under
the Securities Act covering such proposed disposition and such disposition is
made in accordance with such Registration Statement; or

                 (b)  (i) Such Investor shall have notified the Company of the
proposed disposition and shall have furnished the Company with a detailed
statement of the circumstances surrounding the proposed disposition, and (ii)
if reasonably requested by the Company, such Investor shall have furnished the
Company with an opinion of counsel, reasonably satisfactory to the Company,
that such disposition will not require registration of such shares under the
Securities Act.  It is agreed that the Company will not require opinions of
counsel for transactions made pursuant to Rule 144, as currently in existence,
except in unusual circumstances.

                 (c)  Notwithstanding the provisions of subsections (a) and (b)
above, no such registration statement or opinion of counsel shall be necessary
for a transfer by an Investor which is a partnership to a partner of such
partnership or a retired partner of such partnership who retires after the date
hereof, or to the estate of any such partner or retired partner or the transfer
by gift, will or intestate succession of any partner to his spouse or lineal
descendants or ancestors, if the transferee agrees in writing to be subject to
the terms of this Agreement to the same extent as if he were an original
Investor hereunder; provided, however, that the provisions of Section 3.6(b)
above shall apply if the Company or its counsel are unable to determine if such
transfer may be made in compliance with federal and applicable state securities
laws.

                 3.7  Legends.  It is understood that the certificates
evidencing the Series E Preferred Stock (and the Common Stock issuable upon
conversion thereof) may bear one or all of the following legends:

                 (a)  "The shares represented hereby have not been registered
under the United States Securities Act of 1933, and may not be sold,
transferred, assigned, pledged or hypothecated absent an effective registration
thereof under such act or compliance with Rule 144 promulgated under such act,
or unless the Company has received an opinion of counsel, satisfactory to the
Company and its counsel, that such registration is not required."

                 (b)  Any legend required by the laws of the State of
California or other jurisdiction, including any legend required by the
California Department of Corporations.

                 (c)      "The Provisions of Article IV, Section (B)4(d) of the
Company's Restated Certificate of Incorporation may result in more than one
Conversion Price for shares of Series E Preferred Stock.  The Company shall
maintain a ledger of such





                                      -11-
<PAGE>   12
conversion prices for each holder of Series E Preferred Stock, which
information shall be available upon request to the Secretary of the Company by
any Person."

                 (d)      "The Company and the original purchaser of the shares
of Series E Preferred Stock represented by this certificate have entered into
an agreement which waives the adjustment of the Conversion Price of such shares
in certain circumstances.  A copy of the agreement is available from the
Secretary of the Company upon request."

                 3.8  Accredited or Foreign Investor.  Except as disclosed to
the Company in writing, each Investor either (i) is an accredited investor as
defined in Rule 501(a) of Regulation D, as amended, of the SEC under the
Securities Act, or (ii) is neither (x) a national or resident of the United
States, its territories, possessions or any area subject to its jurisdiction,
nor (y) a corporation, partnership, trust or other entity created or organized
in the United States, its territories, possessions or any area subject to its
jurisdiction, nor (z) a corporation, partnership, trust or other entity, any of
the equity owners of which is described in clause (x) or (y) above and agrees
not to sell, hypothecate, pledge or otherwise dispose of any interest in the
Securities in the United States, its territories, possessions or any area
subject to its jurisdiction, or to any person who is a national thereof or
resident therein (including any estate of such person), or any corporation,
partnership or other entity created or organized therein, unless such
securities have been either registered under the Securities Act, or are exempt
from the registration requirements of the Securities Act, in the opinion of the
Company's counsel, and the Investor has complied with any restrictions on
transfer contained in this Agreement.

                 3.9  Confidentiality.  Each Investor hereby represents,
warrants and covenants that it shall maintain in confidence, and shall not use
(except to evaluate its investment in the Company) or disclose without the
prior written consent of the Company, any confidential information that is
furnished to it by the Company in connection with this Agreement, including
(without limitation) all financial statements, budgets and other information
delivered or provided to Investors pursuant to Section 8 hereof.  This
obligation of confidentiality shall not apply, however, to any information (a)
in the public domain through no unauthorized act or failure to act by any
Investor, (b) lawfully disclosed to such Investor by a third party who
possessed such information without any obligation of confidentiality or (c)
lawfully developed by such Investor independent of any disclosure by the
Company.  Each Investor further covenants that it shall return to the Company
all tangible materials containing such information upon reasonable request by
the Company if such Investor is no longer a holder of shares of capital stock
of the Company.





                                      -12-
<PAGE>   13
                 3.10  Removal of Legends; Further Covenants.

                 (a)  Any legend endorsed on a certificate pursuant to Section
3.7(a) hereof shall be removed (i) if the shares of the Series E Preferred
Stock or Common Stock issued upon conversion thereof represented by such
certificate shall have been effectively registered under the Securities Act or
otherwise lawfully sold in a public transaction or in accordance with Rule 144,
(ii) if such shares may be transferred in compliance with Rule 144(k)
promulgated under the Securities Act, or (iii) if the holder of such shares
shall have provided the Company with an opinion of counsel, in form and
substance acceptable to the Company and its counsel and from attorneys
reasonably acceptable to the Company and its counsel, stating that a public
sale, transfer or assignment of such shares may be made without registration.

                 (b)  Any legend endorsed on a certificate pursuant to Section
3.7(b) hereof shall be removed if the Company receives an order of the
appropriate state authority authorizing such removal or if the holder of the
Series E Preferred Stock or Common Stock issued upon conversion thereof
provides the Company with an opinion of counsel, in form and substance
acceptable to the Company and its counsel and from attorneys reasonably
acceptable to the Company and its counsel, stating that such state legend may
be removed.

                 (c)  Each Investor further covenants that such Investor will
not transfer the Series E Preferred Stock or any securities received in
exchange therefor or on conversion thereof, in violation of the Securities Act,
the Securities Exchange Act of 1934, as amended (the "Exchange Act"), or the
rules of the Commission promulgated thereunder, including rule 144 under the
Securities Act.  Further, each Investor agrees that, prior to the closing of
the corporation's initial public offering, such Investor will not transfer any
of such securities in a public offering without the Company's prior consent,
even if he is otherwise permitted to transfer them pursuant to Rule 144(k);
provided that the foregoing shall not affect Investor's rights under Section 7.

                 3.11  Waiver of Antidilution Adjustment.

                 (a)      Each Investor purchasing shares of Series E Preferred
Stock hereunder hereby agrees that in the event that:

                 (i)      the Company shall give a holder of Series E Preferred
         Stock twenty calendar days notice of the Company's intent to offer a
         Dilutive Issuance (as defined below) together with the terms and
         conditions of such Dilutive Issuance, and

                 (ii)  the Company shall offer such holder of Series E
         Preferred Stock that portion (a "Pro-Rata





                                      -13-
<PAGE>   14
         Portion") of such Dilutive Issuance which equals the proportion that
         the number of shares of Common Stock issuable upon conversion of the
         Series E Preferred Stock then held by such holder bears to the total
         number of shares of Common Stock issuable upon conversion of the
         Preferred Stock then outstanding (excluding the Series A Preferred
         Stock), or such lesser portion as the Company may specify in writing,
         and

                 (iii)  such holder fails to tender to the Company, other than
         at the written request of the Company, the purchase price of such
         holder's Pro-Rata Portion (or such lesser portion as the Company may
         specify in writing) of such Dilutive Issuance on the scheduled closing
         of such Dilutive Issuance (which shall not be less than 20 days after
         the written notice provided in (i) above),

then no adjustment of the Conversion Price shall be made (other than
adjustments made prior to the time of such Dilutive Issuance), and any future
adjustment shall be deemed waived, with respect to the shares of Series E
Preferred Stock held by such holder.  Notwithstanding the foregoing:  (a) if no
holder of Series E Preferred Stock purchases any part of such Dilutive
Issuance, regardless of the amount of the dilutive issuance, the provisions of
this Section 3.11(a) shall not apply to such Dilutive Issuance; (b) in the
event any Dilutive Issuance is in excess of $8,000,000, the provisions of this
Section 3.11(a) shall not apply to any holder who purchases less than such
holder's Pro-Rata Portion of such Dilutive Issuance if the purchase price of
such lesser portion is an amount equal to or greater than such holder's
Pro-Rata Portion of $8,000,000; (c) it is understood and agreed that if the
Company only offers an Investor an opportunity to purchase less than an
Investor's Pro Rata Portion, that no waiver shall result from Investor
purchasing such lesser portion (including, without limitation, the portion of
such Dilutive Issuance Investor may purchase under Section 8.4); (d) if
Investors are not entitled to purchase any part of such Dilutive Issuance
pursuant to Section 8.4(d)(iv), the provisions of this Section 3.11(a) shall
not apply to such Dilutive Issuance; and (e) the provisions of this Section
3.11(a) shall apply to the closing of only one Dilutive Issuance in any
12-month period.

                 (b)  A "Dilutive Issuance" shall mean an issuance and sale of
Additional Shares of Common Stock (including Additional Shares of Common Stock
deemed to be Issued pursuant to Article IV, Section (B)4(d)(ii) of the Restated
Certificate) with respect to the Series E Preferred Stock in excess of
$250,000.  Defined terms in this Section 3.11 not otherwise defined in this
Agreement shall have the meanings given such terms in the Restated Certificate.





                                      -14-
<PAGE>   15
                 (c)  Any offer of a Dilutive Issuance pursuant to this Section
3.11 shall be subject to the rights of first offer described in Section
2.2(iii) hereof.

                 (d)  In the event the provisions of this Section 3.11 result
in more than one Conversion Price for the Series E Preferred Stock, the
Secretary of the Company shall keep a written ledger identifying the Conversion
Price in effect for each share of Series E Preferred Stock outstanding, which
information shall be made available to any person upon request.

                 (e)  The waiver of adjustment of Conversion Price provided for
in this Section 3.11 shall bind any transferee of shares of Series E Preferred
Stock.  Each Investor agrees that, prior to transferring any shares of Series E
Preferred Stock to any person or entity, such Investor will ensure that such
transferee shall have delivered to the Company a written agreement to be bound
by the provisions of this Section 3.11.

                 4.  California Commissioner of Corporations.

                 4.1  Corporate Securities Law.  THE SALE OF THE SECURITIES
WHICH ARE THE SUBJECT OF THIS AGREEMENT HAS NOT BEEN QUALIFIED WITH THE
COMMISSIONER OF CORPORATIONS OF THE STATE OF CALIFORNIA AND THE ISSUANCE OF
SUCH SECURITIES OR THE PAYMENT OR RECEIPT OF ANY PART OF THE CONSIDERATION
THEREFOR PRIOR TO SUCH QUALIFICATION IS UNLAWFUL, UNLESS THE SALE OF SECURITIES
IS EXEMPT FROM THE QUALIFICATION BY SECTIONS 25100, 25102 OR 25105 OF THE
CALIFORNIA CORPORATIONS CODE.  THE RIGHTS OF ALL PARTIES TO THIS AGREEMENT ARE
EXPRESSLY CONDITIONED UPON SUCH QUALIFICATION BEING OBTAINED, UNLESS THE SALE
IS SO EXEMPT.

                 5.  Conditions of Investors' Obligations at Closing and
Subsequent Closings.  The obligations of each Investor under subsections 1.1(b)
of this Agreement are subject to the fulfillment on or before Closing of each
of the following conditions, the waiver of which shall not be effective against
any Investor who does not consent in writing thereto:

                 5.1  Representations and Warranties.  The representations and
warranties of the Company contained in Section 2 shall be true on and as of the
Closing with the same effect as though such representations and warranties had
been made on and as of the date of the Closing.

                 5.2  Performance.  The Company shall have performed and
complied with all agreements, obligations and conditions contained in this
Agreement that are required to be performed or complied with by it on or before
the Closing; provided that the obligations of the Investors shall not be
conditional upon the issuance by the Company of the Series E Preferred Stock to
the persons or entities listed on Schedule A who have not performed or tendered
the performance of their obligations under this





                                      -15-
<PAGE>   16
Agreement required to be performed on or prior to the Closing except as
provided in Section 5.7 hereof.

                 5.3  Compliance Certificate.  The President of the Company
shall deliver to each Investor at the Closing a certificate certifying that the
conditions specified in Sections 5.1 and 5.2 have been fulfilled and stating
that there has been no material adverse change in the business, affairs,
prospects, operations, properties, assets or condition of the Company since the
date of the Agreement.

                 5.4  Qualifications.  The Commissioner of Corporations of the
State of California shall have issued a permit qualifying the offer and sale of
the Series E Preferred Stock and the underlying Common Stock to the Investors
pursuant to this Agreement, or such offer and sale shall be exempt from such
qualification under the California Corporate Securities Law of 1968, as
amended.

                 5.5  Proceedings and Documents.  All corporate and other
proceedings in connection with the transactions contemplated at the Closing and
all documents incident thereto shall be reasonably satisfactory in form and
substance to each Investor, and they shall have received all such counterpart
original and certified or other copies of such documents as they may reasonably
request.

                 5.6  Board of Directors.  The Board of Directors at the
Closing shall consist of eight duly elected members: Thomas H. Adams, Kim D.
Blickenstaff, Frederick J. Dotzler, Howard E. Greene, Stephen K. Reidy, Jesse
I. Treu, Gunars E. Valkirs and Timothy J. Wollaeger.

                 5.7  Minimum Investment.  The Investors shall have purchased
at the Closing specified in Section 1.2, an aggregate of at least 1,041,667
shares of Series E Preferred Stock.

                 5.8  Opinion of Company Counsel.  Each Investor shall have
received from Pillsbury Madison & Sutro, counsel for the Company, an opinion,
dated as of the Closing, in form and substance satisfactory to the Investors,
to the effect that:

                 (a)  The Company is a corporation duly organized, validly
existing and in good standing under the laws of the State of Delaware, and the
Company has the requisite corporate power and authority to own its properties
and to conduct its business in the manner presently conducted.

                 (b)  The Company is qualified to do business as a foreign
corporation in the State of California.

                 (c)  The Company has the requisite corporate power and
authority to execute, deliver and perform the Agreement.  The Agreement has
been duly and validly authorized by the Company,





                                      -16-
<PAGE>   17
duly executed and delivered by an authorized officer of the Company and
constitutes a legal, valid and binding obligation of the Company.

                 (d)  The capitalization of the Company is as follows:

                 (i)  Preferred Stock.  There are authorized 8,328,847 shares
         of Preferred Stock, $.01 par value per share, 610,000 shares of which
         have been designated Series A Preferred Stock, 2,156,336 shares of
         which have been designated Series B Preferred Stock, 2,204,167 shares
         of which have been designated Series C Preferred Stock, 1,900,010
         shares of which have been designated Series D Preferred Stock and
         1,458,334 shares of which have been designated Series E Preferred
         Stock.  610,000 shares of Series A Preferred Stock, 2,156,336 shares
         of Series B Preferred Stock, 2,204,167 shares of Series C Preferred
         Stock and 1,900,010 shares of Series D Preferred Stock have been duly
         issued and delivered, are validly outstanding, fully paid and
         nonassessable, and have been approved by all requisite corporate
         action and, based in part on the representations and warranties of the
         investors in such securities, were issued in compliance with all
         applicable federal and California securities laws.  The shares of
         Series E Preferred Stock being issued under this Agreement, when
         issued, delivered and paid for, will be duly authorized, issued and
         delivered and will be validly outstanding, fully paid and
         nonassessable, and have been approved by all requisite corporate
         action and, to the best of counsel's knowledge, are free of any liens
         and encumbrances.  The rights, privileges and preferences of the
         Series A Preferred Stock, the Series B Preferred Stock, the Series C
         Preferred Stock, the Series D Preferred Stock and Series E Preferred
         Stock are as stated in the Company's Restated Certificate.  The shares
         of Common Stock issuable upon the conversion of the Series A Preferred
         Stock, the Series B Preferred Stock, the Series C Preferred Stock, the
         Series D Preferred Stock and Series E Preferred Stock have been duly
         and validly reserved for issuance and, when issued in accordance with
         the Company's Restated Certificate, will be validly issued, fully paid
         and nonassessable.

                 (ii)  Common Stock.  There are authorized 12,000,000 shares of
         Common Stock, of which 1,138,069 shares have been duly issued and
         delivered and are validly outstanding, fully paid and nonassessable.

                 (iii)  Except for (A) the conversion privileges of the Series
         A Preferred Stock, Series B Preferred Stock, Series C Preferred Stock,
         Series D Preferred





                                      -17-
<PAGE>   18
         Stock and Series E Preferred Stock, (B) the right of first offer of
         the Investors provided for in Section 8.4 of this Agreement, (C) the
         right of first offer provided for in Section 8.4 of the Series A
         Agreement, (D) the right of first offer provided in Section 8.4 of the
         Series B Agreement, (E) the right of first offer provided for in
         Section 8.4 of the Series C Agreement, (F) the right of first offer
         provided for in Section 8.4 of the Series D Agreement and (G) options
         to purchase Common Stock of the Company issued under the 1989 Stock
         Plan of the Company, there are no preemptive rights or similar rights
         or, to the best of counsel's knowledge, options, warrants, conversion
         privileges or other rights (or agreements for any such rights)
         outstanding to purchase from or otherwise obtain from the Company any
         shares of its capital stock.

                 (e)  The certificates representing shares of the Series E
Preferred Stock are in due and proper form and have been duly and validly
executed by the officers of the Company named thereon.

                 (f)  The execution, delivery, performance and compliance with
the terms of this Agreement do not violate any provision of any applicable
federal, state law, rule or regulation or any provision of the Company's
Restated Certificate or Bylaws and do not conflict with or constitute a
material default under the provision of any judgment, writ, decree, order or
material agreement known by counsel by which the Company is a party or by which
it is bound, which violation, conflict or default would be materially adverse
to the Company.

                 (g)  All consents, approvals, orders or authorizations of, and
all qualifications, registrations, designations, declarations or filings with,
any federal or state governmental authority on the part of the Company (other
than by federal or state securities laws which are covered in paragraph (h)
below) required to be made prior to the Closing in connection with the
consummation of the transactions contemplated by this Agreement have been
obtained, and are effective, as of the Closing and such counsel is not aware of
any proceedings, or threat thereof, which question the validity thereof.

                 (h)  Based in part upon the representations of the Investors,
the offer and sale of the Series E Preferred Stock pursuant to the terms of
this Agreement are exempt from the registration requirements of section 5 of
the Securities Act of 1933, as amended, by virtue of section 4(2) thereof and
from the qualification requirements of the California Corporate Securities Law
of 1968, as amended, by virtue of section 25102(f) thereof.  No opinion need be
expressed as to compliance with applicable antifraud statutes, rules and
regulations of any applicable law governing the issuance of securities.





                                      -18-
<PAGE>   19
                 (i)  Such counsel is not aware, after making inquiry of the
Company's chief executive officer (but without any other investigation), that
there is any action, proceeding or investigation pending against the Company or
any of its officers, directors or employees, or that any of the foregoing has
received any threat thereof, which questions the validity of the Agreement, or
which might result, either individually or in the aggregate, in any material
adverse change in the assets, condition, affairs or prospects of the Company.

                 The opinion of counsel for the Company under this Section 5.8
shall be subject to such matters as are set forth in the Schedule of Exceptions
to this Agreement.

                 5.9  Restated Certificate.  The Restated Certificate in
substantially the same form attached hereto as Exhibit A shall have been filed
with the Delaware Secretary of State.

                 5.10  Lawful Issuance.  At the Closing, the purchase of the
Series E Preferred Stock by the Investors shall be legally permitted by all
laws and regulations to which the Investors and the Company are subject.

                 5.11  Amended Co-Sale Agreement.  The Company shall have
entered into an amended and restated Co-Sale Agreement in substantially the
form of Exhibit B hereto together with the Principal Stockholders (as defined
therein).

                 5.12  Letter Agreement.  The Company shall have entered into a
letter agreement with E. Merck in form and substance satisfactory to each party
regarding the negotiation of the joint development of cardiac markers.

                 6.  Conditions of the Company's Obligations at the Closing.
The obligations of the Company to each Investor under this Agreement are
subject to the fulfillment on or before the Closing of each of the following
conditions by such Investor:

                 6.1  Representations and Warranties.  The representations and
warranties of the Investor contained in Section 3 hereof shall be true on and
as of the Closing with the same effect as though such representations and
warranties had been made on and as of the Closing.

                 6.2  Payment of Purchase Price.  Each Investor shall have
delivered the purchase price specified in Section 1.2 and Investors shall
collectively have acquired and paid for at the Closing specified in Section
1.2, an aggregate of at least 1,041,667 shares of Series E Preferred Stock.

                 6.3  California Qualification.  The Commissioner of
Corporations of the State of California shall have issued a permit qualifying
the offer and sale to the Investors of the Series E Preferred Stock and Common
Stock issuable upon the





                                      -19-
<PAGE>   20
conversion thereof or such offer and sale shall be exempt from such
qualification under the California Corporate Securities Law of 1968, as
amended.

                 6.4      Amendment to Distributorship Agreement.  The Company
shall have entered into a letter agreement with E. Merck in form and substance
satisfactory to each party amending the Distributorship Agreement dated as of
July 27, 1992 between the Company and E. Merck.

                 7.  Registration Rights.  The Company covenants and agrees as
                     follows:

                 7.1  Definitions.  For purposes of this Section 7:

                 (a)  The terms "register," "registered" and "registration"
refer to a registration effected by preparing and filing a registration
statement or similar document in compliance with the Securities Act, and the
declaration or ordering of effectiveness of such registration statement or
document;

                 (b)  The term "Registrable Securities" means (i) the Common
Stock issuable or issued upon conversion of the Series E Preferred Stock and
(ii) any Common Stock of the Company issued as (or issuable upon the conversion
or exercise of any warrant, right or other security which is issued as) a
dividend or other distribution with respect to, or in exchange for or in
replacement of, such Series E Preferred Stock or Common Stock, excluding in all
cases, however, any Registrable Securities sold by a person in a transaction in
which such person's registration rights under this Section 7 are not assigned;

                 (c)  The number of shares of "Registrable Securities then
outstanding" shall be determined by the number of shares of Common Stock
outstanding which are, and the number of shares of Common Stock issuable
pursuant to then exercisable or convertible securities which are exercisable or
convertible into, Registrable Securities; and

                 (d)  The term "Holder" means any person owning or having the
right to acquire Registrable Securities or any assignee thereof in accordance
with Section 7.10 hereof.

                 7.2  Company Registration.

                 (a)      Commencing two years after the effective date of the
Company's first registered public offering of stock, if (but without any
obligation to do so) the Company proposes to register (including for this
purpose a registration effected by the Company for stockholders other than the
Holders) any of its stock or other securities under the Securities Act in
connection with the public offering of such securities solely for cash (other
than a registration relating solely to the sale of securities to participants
in a Company stock plan, or a





                                      -20-
<PAGE>   21
registration on any form which does not include substantially the same
information as would be required to be included in a registration statement
covering the sale of the Registrable Securities), the Company shall, at such
time, promptly give each Holder written notice of such registration.  Upon the
written request of each Holder given within 20 days after mailing of such
notice by the Company in accordance with Section 9.6, the Company shall,
subject to the provisions of Section 7.6, cause to be registered under the
Securities Act all of the Registrable Securities that each such Holder has
requested to be registered.

                 (b)      The Company is obligated to effect only two such
registrations pursuant to this Section 7.2 on behalf of the Holders of Series E
Preferred Stock.

                 7.3  Obligations of the Company.  Whenever required under this
Section 7 to effect the registration of any Registrable Securities, the Company
shall, as expeditiously as reasonably possible:

                 (a)  Prepare and file with the SEC a registration statement
with respect to such Registrable Securities and use its best efforts to cause
such registration statement to become effective, and, upon the request of the
Holders of a majority of the Registrable Securities registered thereunder, keep
such registration statement effective for up to 120 days.

                 (b)  Prepare and file with the SEC such amendments and
supplements to such registration statement and the prospectus used in
connection with such registration statement as may be necessary to comply with
the provisions of the Securities Act with respect to the disposition of all
securities covered by such registration statement.

                 (c)  Furnish to the Holders such number of copies of a
prospectus, including a preliminary prospectus, in conformity with the
requirements of the Securities Act, and such other documents as they may
reasonably request in order to facilitate the disposition of Registrable
Securities owned by them.

                 (d)  Use its best efforts to register and qualify the
securities covered by such registration statement under such other securities
or Blue Sky laws of such jurisdictions as shall be reasonably requested by the
Holders, provided that the Company shall not be required in connection
therewith or as a condition thereto to qualify to do business or to file a
general consent to service of process in any such states or jurisdictions.

                 (e)  In the event of any underwritten public offering, enter
into and perform its obligations under an underwriting agreement, in usual and
customary form, with the managing underwriter of such offering.  Each Holder
participating in such





                                      -21-
<PAGE>   22
underwriting shall also enter into and perform its obligations under such an
agreement.

                 (f)  Notify each Holder of Registrable Securities covered by
such registration statement at any time when a prospectus relating thereto is
required to be delivered under the Securities Act of the happening of any event
as a result of which the prospectus included in such registration statement, as
then in effect, includes an untrue statement of a material fact or omits to
state a material fact required to be stated therein or necessary to make the
statements therein not misleading in the light of the circumstances then
existing.

                 (g)  Furnish, at the request of any Holder requesting
registration of Registrable Securities pursuant to this Section 7, on the date
that such Registrable Securities are delivered to the underwriters for sale in
connection with a registration pursuant to this Section 7, if such securities
are being sold through underwriters, or, if such securities are not being sold
through underwriters, on the date that the registration statement with respect
to such securities becomes effective, (i) an opinion, dated such date, of the
counsel representing the Company for the purposes of such registration, in form
and substance as is customarily given to underwriters in an underwritten public
offering, addressed to the underwriters, if any, and to the Holders requesting
registration of Registrable Securities and (ii) a letter dated such date, from
the independent certified public accountants of the Company, in form and
substance as is customarily given by independent certified public accountants
to underwriters in an underwritten public offering, addressed to the
underwriters, if any, and to the Holders requesting registration of Registrable
Securities.

                 7.4  Furnish Information.  It shall be a condition precedent
to the obligations of the Company to take any action pursuant to this Section 7
that the selling Holders shall furnish to the Company such information
regarding themselves, the Registrable Securities held by them, and the intended
method of disposition of such securities as shall be required to effect the
registration of the Registrable Securities.

                 7.5  Expenses of Company Registration.  The Company shall bear
and pay all expenses incurred in connection with any registration, filing or
qualification of Registrable Securities with respect to the registrations
pursuant to Section 7.2 for each Holder (which right may be assigned as
provided in Section 7.10), including (without limitation) all registration,
filing and qualification fees, printer's and accounting fees relating or
apportionable thereto, but excluding underwriting discounts and commissions
relating to Registrable Securities and the fees and disbursements of counsel
for the selling Holders.

                 7.6  Underwriting Requirements.  In connection with any
offering involving an underwriting of shares being issued by





                                      -22-
<PAGE>   23
the Company, the Company shall not be required under Section 7.2 to include any
of the Holders' securities in such underwriting unless they accept the terms of
the underwriting as agreed upon between the Company and the underwriters
selected by it, and then only in such quantity as will not, in the opinion of
the underwriters, jeopardize the success of the offering by the Company.  If
the total amount of securities, including Registrable Securities, requested by
stockholders to be included in such offering exceeds the amount of securities
sold other than by the Company that the underwriters reasonably believe
compatible with the success of the offering, then the Company shall be required
to include in the offering only that number of such securities, including
Registrable Securities, which the underwriters believe will not jeopardize the
success of the offering (the securities so included to be apportioned pro rata
among the selling stockholders according to the total amount of securities
entitled to be included therein owned by each selling stockholder or in such
other proportions as shall mutually be agreed to by such selling stockholders)
but in no event shall the amount of securities of the selling Holders, together
with all other securities to be registered pursuant to the exercise of
registration rights, included in the offering be reduced below 30% of the total
amount of securities included in such offering.

                 7.7  Delay of Registration.  No Holder shall have any right to
obtain or seek an injunction restraining or otherwise delaying any such
registration as the result of any controversy that might arise with respect to
the interpretation or implementation of this Section 7.

                 7.8  Indemnification.  In the event any Registrable Securities
are included in a registration statement under this Section 7:

                 (a)  To the extent permitted by law, the Company will
indemnify and hold harmless each Holder, the officers and directors of each
Holder, any underwriter (as defined in the Securities Act) for such Holder and
each person, if any, who controls such Holder or underwriter within the meaning
of the Securities Act or the Securities Exchange Act of 1934, as amended (the
"Exchange Act"), against any losses, claims, damages or liabilities (joint or
several) to which they may become subject under the Securities Act, the
Exchange Act or other federal or state law, insofar as such losses, claims,
damages or liabilities (or actions in respect thereof) arise out of or are
based upon any of the following statements, omissions or violations
(collectively, a "Violation"):  (i) any untrue statement or alleged untrue
statement of a material fact contained in such registration statement,
including any preliminary prospectus or final prospectus contained therein or
any amendments or supplements thereto, (ii) the omission or alleged omission to
state therein a material fact required to be stated therein, or necessary to
make the statements therein not mis-





                                      -23-
<PAGE>   24
leading, or (iii) any violation or alleged violation by the Company of the
Securities Act, the Exchange Act, any state securities law or any rule or
regulation promulgated under the Securities Act, the Exchange Act or any state
securities law; and the Company will reimburse each such Holder, officer or
director, underwriter or controlling person for any legal or other expenses
reasonably incurred by them in connection with investigating or defending any
such loss, claim, damage, liability or action; provided, however, that the
indemnity agreement contained in this subsection 7.8(a) shall not apply to
amounts paid in settlement of any such loss, claim, damage, liability or action
if such settlement is effected without the consent of the Company (which
consent shall not be unreasonably withheld), nor shall the Company be liable in
any such case for any such loss, claim, damage, liability or action to the
extent that it arises out of or is based upon a Violation which occurs in
reliance upon and in conformity with written information furnished expressly
for use in connection with such registration by any such Holder, officer,
director, underwriter or controlling person.

                 (b)  To the extent permitted by law, each selling Holder will
indemnify and hold harmless the Company, each of its directors, each of its
officers who have signed the registration statement, each person, if any, who
controls the Company within the meaning of the Securities Act, any underwriter
and any other Holder selling securities in such registration statement or any
of its directors or officers or any person who controls such Holder, against
any losses, claims, damages or liabilities (joint or several) to which the
Company or any such director, officer, controlling person, or underwriter or
controlling person, or other such Holder or director, officer or controlling
person may become subject, under the Securities Act, the Exchange Act or other
federal or state law, insofar as such losses, claims, damages or liabilities
(or actions in respect thereto) arise out of or are based upon any Violation,
in each case to the extent (and only to the extent) that such Violation occurs
in reliance upon and in conformity with written information furnished by such
Holder expressly for use in connection with such registration; and each such
Holder will reimburse any legal or other expenses reasonably incurred by the
Company or any such director, officer, controlling person, underwriter or
controlling person, other Holder, officer, director, or controlling person in
connection with investigating or defending any such loss, claim, damage,
liability, or action; provided, however, that the indemnity agreement contained
in this subsection 7.8(b) shall not apply to amounts paid in settlement of any
such loss, claim, damage, liability or action if such settlement is effected
without the consent of the Holder, which consent shall not be unreasonably
withheld; provided, that, in no event shall any indemnity under this subsection
7.8(b) exceed the gross proceeds from the offering received by such Holder.





                                      -24-
<PAGE>   25
                 (c)  Promptly after receipt by an indemnified party under this
Section 7.8 of notice of the commencement of any action (including any
governmental action), such indemnified party will, if a claim in respect
thereof is to be made against any indemnifying party under this Section 7.8,
deliver to the indemnifying party a written notice of the commencement thereof
and the indemnifying party shall have the right to participate in, and, to the
extent the indemnifying party so desires, jointly with any other indemnifying
party similarly noticed, to assume the defense thereof with counsel mutually
satisfactory to the parties; provided, however, that an indemnified party shall
have the right to retain its own counsel, with the fees and expenses to be paid
by the indemnifying party, if representation of such indemnified party by the
counsel retained by the indemnifying party would be inappropriate due to actual
or potential differing interests between such indemnified party and any other
party represented by such counsel in such proceeding.  The failure to deliver
written notice to the indemnifying party within a reasonable time of the
commencement of any such action, if prejudicial to its ability to defend such
action, shall relieve such indemnifying party of any liability to the
indemnified party under this Section 7.8, but the omission so to deliver
written notice to the indemnifying party will not relieve it of any liability
that it may have to any indemnified party otherwise than under this Section
7.8.

                 (d)  The obligations of the Company and Holders under this
Section 7.8 shall survive the completion of any offering of Registrable
Securities in a registration statement under this Section 7, and otherwise.

                 7.9  Reports Under Securities Exchange Act of 1934.  With a
view to making available to the Holders the benefits of Rule 144 promulgated
under the Securities Act and any other rule or regulation of the SEC that may
at any time permit a Holder to sell securities of the Company to the public
without registration, the Company agrees to:

                 (a)  make and keep public information available, as those
terms are understood and defined in SEC Rule 144, at all times after 90 days
after the effective date of the first registration statement filed by the
Company for the offering of its securities to the general public;

                 (b)  take such action, including the voluntary registration of
its Common Stock under section 12 of the Exchange Act, as is necessary to
enable the Holders to utilize Form S-3 for the sale of their Registrable
Securities, such action to be taken as soon as practicable after the end of the
fiscal year in which the first registration statement filed by the Company for
the offering of its securities to the general public is declared effective;





                                      -25-
<PAGE>   26
                 (c)  file with the SEC in a timely manner all reports and
other documents required of the Company under the Securities Act and the
Exchange Act; and

                 (d)  furnish to any Holder, so long as the Holder owns any
Registrable Securities, forthwith upon request (i) a written statement by the
Company that it has complied with the reporting requirements of SEC Rule 144
(at any time after 90 days after the effective date of the first registration
statement filed by the Company), the Securities Act and the Exchange Act (at
any time after it has become subject to such reporting requirements), (ii) a
copy of the most recent annual or quarterly report of the Company and such
other reports and documents so filed by the Company, and (iii) such other
information as may be reasonably requested in availing any Holder of any rule
or regulation of the SEC which permits the selling of any such securities
without registration or pursuant to such form.

                 7.10  Assignment of Registration Rights.  The rights to cause
the Company to register Registrable Securities pursuant to this Section 7 may
be assigned by a purchaser of Registrable Securities under this Agreement to a
transferee or assignee of an amount of such securities representing at least
50% of the aggregate number of shares of Registrable Securities of such
purchaser or to a partner or retired partner of such purchaser; provided, that
such transferee or assignee is approved by the Board of Directors of the
Company, which approval shall not be unreasonably withheld, and that the
Company is, within a reasonable time after such approved transfer, furnished
with written notice of the name and address of such transferee or assignee and
the securities with respect to which such registration rights are being
assigned; and provided, further, that such assignment shall be effective only
if immediately following such transfer the further disposition of such
securities by the approved transferee or assignee is restricted under the
Securities Act.

                 7.11  "Market Stand-Off" Agreement.  Each Investor hereby
agrees that it shall not, to the extent requested by the Company and an
underwriter of Common Stock (or other securities) of the Company, sell or
otherwise transfer or dispose (other than to donees who agree to be similarly
bound) of any Registrable Securities during a reasonable and customary period
of time as agreed to by the Company and the underwriters (not to exceed 180
days) following the effective date of a registration statement of the Company
filed under the Securities Act; provided, however, that:

                 (a)  such agreement shall be applicable only to the first such
registration statement of the Company which covers shares (or securities) to be
sold on its behalf to the public in an underwritten offering; and





                                      -26-
<PAGE>   27
                 (b)  all officers and directors of the Company and all other
persons with registration rights (whether or not pursuant to this Agreement)
enter into similar agreements.

                 In order to enforce the foregoing covenant, the Company may
impose stop-transfer instructions with respect to the Registrable Securities of
each Investor (and the shares or securities of every other person subject to
the foregoing restriction) until the end of such reasonable and customary
period.

                 7.12  Amendment of Registration Rights.  Any provision of this
Section 7 may be amended and the observance thereof may be waived (either
generally or in a particular instance and either retroactively or
prospectively), only with the written consent of the Company and the holders of
a majority of the Registrable Securities.  Any amendment or waiver effected in
accordance with this paragraph shall be binding upon each holder of any
securities purchased under this Agreement at the time outstanding (including
securities into which such securities are convertible), each future holder of
all such securities, and the Company.

                 7.13  Termination of Registration Rights.  The Company's
obligations pursuant to this Section 7 shall terminate seven years from the
date of consummation of the Company's sale of its common stock in a bona fide,
firm commitment underwriting pursuant to a registration statement on Form S-1
under the Securities Act which results in gross offering proceeds to the
Company of more than $7,500,000, the public offering price of which was not
less than $9.00 per share (adjusted to reflect stock dividends, stock splits or
recapitalizations).

                 8.  Covenants.

                 8.1  Delivery of Financial Statements.  The Company shall
deliver to (i) each Investor who acquires at least $1,000,000 of Series E
Preferred Stock ("Major Investor") and (ii) each assignee of any Major Investor
who acquires 50% of such Major Investor's Series E Preferred Stock purchased
hereunder:

                 (a)  as soon as practicable, but in any event within 90 days
after the end of each fiscal year of the Company, an income statement for such
fiscal year, a balance sheet of the Company as of the end of such year, and a
statement of cash flows for such year, such year-end financial reports to be in
reasonable detail, prepared in accordance with generally accepted accounting
principles ("GAAP"), and audited and certified by independent public
accountants of nationally recognized standing selected by the Company (the
Company will include, upon request, the Company's management letter for such
audited reports); and





                                      -27-
<PAGE>   28
                 (b)  (i)  within 30 days of the end of each month, an
         unaudited statement of operations, statement of cash flows and balance
         sheet for and as of the end of such month, in reasonable detail; such
         monthly statements shall also contain the foregoing information on a
         year-to-date basis and shall also compare actual performance to
         budget; and

                 (ii)  At least annually, a comprehensive operating budget for
         the next fiscal year forecasting the Company's revenues, expenses and
         cash position, prepared on a monthly basis, including balance sheets
         and sources and applications of funds statements for such months and,
         as soon as prepared, any other budgets or revised budgets prepared by
         the Company; and

                 (iii)  such other information relating to the financial
         condition, business, research, prospects or corporate affairs of the
         Company as the Investor or any such assignee of the Investor may from
         time to time request, provided, however, that the Company shall not be
         obligated to provide information which it deems in good faith to be
         proprietary; and

                 (c)  with respect to the financial statements called for in
subsection (b)(i) of this Section 8.1, an instrument executed by the Treasurer
or the President of the Company and certifying that such financials were
prepared in accordance with internally consistent accounting methods
consistently applied with prior practice for earlier periods and fairly present
the financial condition of the Company and its results of operation for the
period specified, subject to year-end audit adjustment.  For purposes of this
Section 8, a Major Investor includes affiliated investing entities of that
Investor.

                 8.2  Inspection.  The Company shall permit each Investor, at
such Investor's expense, to visit and inspect the Company's properties, to
examine its books of account and records and to discuss the Company's affairs,
finances and accounts with its officers, all at such reasonable times as may be
requested by the Investor; provided, however, that the Company shall not be
obligated pursuant to this Section 8.2 to provide access to any information
which it reasonably considers to be a trade secret or similar confidential or
proprietary information.

                 8.3  Termination of Covenants.  The covenants set forth in
Sections 8.1, 8.2 and 8.5 shall terminate and be of no further force or effect
when the sale of securities pursuant to a registration statement filed by the
Company under the Securities Act in connection with the firm commitment
underwritten offering of its securities to the general public is consummated or
when the Company first becomes subject to the periodic reporting requirements
of Section 13(a) or 15(d) of the Exchange





                                      -28-
<PAGE>   29
Act, whichever event shall first occur; provided that the Company shall furnish
for a period of five years from the termination of such covenants to each Major
Investor copies of its reports on Forms 10-K and 10-Q within 10 days after
filing with the SEC.

                 8.4  Right of First Offer.  Subject to the terms and
conditions specified in this Section 8.4, the Company hereby grants to each
Investor a right of first offer with respect to future sales by the Company of
its Shares (as hereinafter defined).  A Investor shall be entitled to apportion
the right of first offer hereby granted it among itself and its partners and
affiliates in such proportions as it deems appropriate.

                 Each time the Company proposes to offer any shares of, or
securities convertible into or exercisable for, any class of its capital stock
("Shares"), the Company shall first make an offering of such Shares to each
Investor in accordance with the following provisions:

                 (a)  The Company shall deliver a notice by certified mail
("Notice") to the Investors stating (i) its bona fide intention to offer or
issue such Shares, (ii) the number of such Shares to be offered, and (iii) the
price, if any, for which it proposes to offer such Shares.

                 (b)  Within 20 calendar days after receipt of the Notice, the
Investor may elect to purchase or obtain, at the price and on the terms
specified in the Notice, up to that portion of such Shares which equals the
proportion that the number of shares of Common Stock issuable (or issued and
held) upon conversion of the Series E Preferred Stock then held, by such
Investor bears to the total number of shares of outstanding Common Stock and
Common Stock issuable upon conversion of the Preferred Stock then outstanding.
The Company shall promptly, in writing, inform each Investor which purchases
all the shares available to it ("Fully Exercising Investor") of any other
Investor's failure to do likewise.  During the 10-day period commencing after
receipt of such information, each Fully Exercising Investor shall be entitled
to obtain that portion of the shares subject to such right of first refusal and
not subscribed for by the Investors which is equal to the proportion that the
number of shares of Common Stock issuable (or issued and held) upon conversion
of the Series E Preferred Stock then held by such Fully Exercising Investor
bears to the total number of shares of Common Stock issuable (or issued and
held) upon conversion of the Series E Preferred Stock then held by all Fully
Exercising Investors who wish to purchase some of the unsubscribed shares.

                 (c)  If all such Shares referred to in the Notice are not
elected to be obtained as provided in subsection 8.4(b) hereof, the Company
may, during the 60 day period following the expiration of the period provided
in subsection 8.4(b) hereof,





                                      -29-
<PAGE>   30
offer the remaining unsubscribed Shares to any person or persons at a price not
less than that, and upon terms no more favorable to the offeree than those,
specified in the Notice.  If the Company does not enter into an agreement for
the sale of the Shares within such period, or if such agreement is not
consummated within 60 days of the execution thereof, the right provided
hereunder shall be deemed to be revived and such Shares shall not be offered
unless first reoffered to the Investors in accordance herewith.

                 (d)  The right of first offer granted in this Section 8.4
shall not be applicable (i) to the issuance or sale of shares of Common Stock
(or options therefor), to employees, directors, consultants or advisors of the
Company, provided each such person executes an agreement, in substantially the
form as approved by the Company's Board of Directors, (ii) shares offered in
the acquisition of another company, to strategic partners of the Company or to
companies with business relationships with the Company or in connection with
research and development partnerships sponsored by the Company, (iii) to or
after consummation of a bona fide, firmly underwritten public offering of
shares of the Company's Common Stock registered under the Securities Act
pursuant to a registration statement on Form S-1, which results in gross
proceeds to the Company of more than $7,500,000 at a price per share of at
least $9.00 (adjusted for any stock splits, stock dividends or other
recapitalizations), or (iv) in the event of an offering of Shares by the
Company to which the holders of a majority of the then outstanding Series A
Preferred Stock, Series B Preferred Stock, Series C Preferred Stock and Series
D Preferred Stock have waived their respective rights of first offer provided
for in Section 8.4 of the Series A Agreement, the Series B Agreement, the
Series C Agreement and the Series D Agreement, as the case may be.

                 9.  Miscellaneous.

                 9.1  Survival of Warranties.  The warranties, representations
and covenants of the Company contained in or made pursuant to this Agreement
shall survive the execution and delivery of this Agreement and the Closing and
shall in no way be affected by any investigation of the subject matter thereof
made by or on behalf of the Investors.

                 9.2  Successors and Assigns.  The terms and conditions of this
Agreement shall inure to the benefit of and be binding upon the respective
successors and assigns of the parties.  Nothing in this Agreement, express or
implied, is intended to confer upon any party other than the parties hereto or
their respective successors and assigns any rights, remedies, obligations, or
liabilities under or by reason of this Agreement, except as expressly provided
in this Agreement.





                                      -30-
<PAGE>   31
                 9.3  Governing Law.  This Agreement shall be governed by and
construed in accordance with the laws of the State of California except as it
regards choice of law.

                 9.4  Counterparts.  This Agreement may be executed in two or
more counterparts, each of which shall be deemed an original, but all of which
together shall constitute one and the same instrument.

                 9.5  Titles and Subtitles.  The titles and subtitles used in
this Agreement are used for convenience only and are not to be considered in
construing or interpreting this Agreement.

                 9.6  Notices.  Unless otherwise provided, any notice required
or permitted under this Agreement shall be given in writing and shall be deemed
effectively given upon personal delivery to the party to be notified or upon
deposit with the United States Post Office, by registered or certified mail,
postage prepaid and addressed to the party to be notified at the address
indicated for such party on the signature page hereof, or at such other address
as such party may designate by 10 days' advance written notice to the other
parties.

                 9.7  Finder's Fee.  Each party represents that it neither is
nor will be obligated for any finder's fee or commission in connection with
this transaction.  Each Investor agrees to indemnify and hold harmless the
Company from any liability for any commission or compensation in the nature of
a finder's fee (and the costs and expenses of defending against such liability
or asserted liability) for which the Investor or any of its officers, partners,
employees or representatives is responsible.

                 The Company agrees to indemnify and hold harmless each
Investor from any liability for any commission or compensation in the nature of
a finder's fee (and the costs and expenses of defending against such liability
or asserted liability) for which the Company or any of its officers, employees
or representatives is responsible.

                 9.8  Expenses.  Irrespective of whether the Closing is
effected, the Company shall pay all costs and expenses that it incurs with
respect to the negotiation, execution, delivery and performance of this
Agreement.  If any action at law or in equity is necessary to enforce or
interpret the terms of this Agreement or the Restated Certificate, the
prevailing party shall be entitled to reasonable attorney's fees, costs and
necessary disbursements in addition to any other relief to which such party may
be entitled.

                 9.9  Amendments and Waivers.  Any term of this Agreement may
be amended and the observance of any term of this Agreement may be waived
(either generally or in a particular instance and either retroactively or
prospectively), only with





                                      -31-
<PAGE>   32
the written consent of the Company and the holders of a majority of the Common
Stock issued or issuable upon conversion of the Series E Preferred Stock
purchased by the Investors pursuant to this Agreement, except: (i) as specified
in Section 7.12 and Section 8.4(d), and (ii) no amendment shall increase the
price of the Series E Preferred Stock without the consent of all Investors, and
any material amendment or waiver which does not apply equally to all Major
Investors shall not be effective unless it has been consented to or approved in
writing by a majority of the inequitably affected Major Investors.  Any
amendment or waiver effected in accordance with this paragraph shall be binding
upon each holder of any securities purchased under this Agreement at the time
outstanding (including securities into which such securities are convertible),
each future holder of all such securities, and the Company; provided, however,
that no condition set forth in Section 5 hereof may be waived with respect to
any Investor who does not consent thereto.

                 9.10  Severability.  If one or more provisions of this
Agreement are held to be unenforceable under applicable law, such provision
shall be excluded from this Agreement and the balance of this Agreement shall
be interpreted as if such provision were so excluded and shall be enforceable
in accordance with its terms.

                 9.11  Aggregation of Stock.  All shares of Series E Preferred
Stock held or acquired by affiliated entities or persons shall be aggregated
together for the purpose of determining the availability of any rights under
this Agreement.


                 IN WITNESS WHEREOF,  the parties have executed this Agreement
as of the date first above written.

                                                     
                                                     
                                       BIOSITE DIAGNOSTICS INCORPORATED



                                       By /s/ Kim D. Blickenstaff
                                          -----------------------------
                       Address:        11030 Roselle Street, Suite D
                                       San Diego, CA 92121






                                      -32-
<PAGE>   33
                                                     
                                                     
                                       INVESTORS:


                                       E. Merck



                                       By /s/ ppa. Koch
                                          -------------------------------------

                                       Title  General Manager Diagnostics 
                                              Division
                                              ---------------------------------



                                       By /s/ ppa. Dr. Bardorff
                                          -------------------------------------

                                       Title  General Manager Sales & Marketing
                                              ---------------------------------

                       Address:        Diagnostics Division
                                       Frankfurter Strasse 250
                                       D-6100 Darmstadt 1
                                       Federal Republic of Germany

                                       Attn:  Alfred Koch






                                      -33-
<PAGE>   34
                                   SCHEDULE A

                        BIOSITE DIAGNOSTICS INCORPORATED

                            SERIES E PREFERRED STOCK


<TABLE>
<CAPTION>
Investors                                                                   Shares                   Amount
- ---------                                                                   ------                   ------
<S>                                                                      <C>                     <C>
E. Merck                                                                 1,041,667               $5,000,001.60
</TABLE>



<PAGE>   35

                        Biosite Diagnostics Incorporated

                        Supplemental Signature Pages To
                  Series E Preferred Stock Purchase Agreement
                         Dated as of November 25, 1992

                       Second Closing--December 15, 1992


        By their execution hereof, BIOSITE DIAGNOSTICS INCORPORATED, a Delaware
corporation (the "Company"), and each of the undersigned investors (the
"investors") hereby become parties to the Stock Purchase Agreement dated as of
November 25, 2993 (the "Agreement") between the Company and the parties
thereto. As of the Second Closing, as defined below, the Company and each of
the undersigned investors hereby acknowledge and agree to be bound by all of
the provisions, terms and conditions of the Agreement and each of the
undersigned investors represents and warrants on its own behalf that the
representations and warranties set forth in Section 3 of the Agreement are true
and correct. The shares of Series E Preferred Stock acquired by each of the
undersigned investors at the Second Closing shall be deemed to have been
acquired under the Agreement. the Company will deliver at the Second Closing an
updated Schedule of Exceptions to the Agreement.

        Each of the undersigned investors agrees to purchase and the Company
agrees to sell and issue the number of shares of the Company's Series E
Preferred Stock set forth opposite such investor's name on the attached
Supplement No. 1 to Schedule A to the Agreement (the "Series E Preferred
Stock"), for the purchase price of $4.80 per share. The purchase and sale of
the Series E Preferred Stock shall take place at the offices of Pillsbury
Madison & Sutro, 235 Montgomery Street, San Francisco, California at 2:00 p.m.
on December 15, 1992 or at such other time and place as the Company and a
majority of the undersigned investors shall agree (the "Second Closing").

       BIOSITE DIAGNOSTICS INCORPORATED


        By /s/ Kim D. Blickenstaff
           ----------------------------------------
Address:   11030 Rosell Street,
           San Diego, CA 92121

<PAGE>   36
                        Biosite Diagnostics Incorporated
            Supplemental Signature Pages to Series E Preferred Stock
                Purchase Agreement dated as of November 25, 1992

                      Second Closing -- December 15, 1992


        INVESTORS:

        KLEINER PERKINS CAUFIELD & BYERS V,
        A CALIFORNIA LIMITED PARTNERSHIP

        By: KPCB V ASSOCIATES, A CALIFORNIA
            LIMITED PARTNERSHIP, its General Partner

        By: /s/ Brook H. Byers
            ----------------------------------------
            Brook H. Byers
            General Partner

   Address: 2200 Geng Road, Suite 205
            Two Embarcadero Place
            Palo Alto, CA 94303

            CHC Venture Co.

        By: /s/ Timothy J. Wollaeger
            -----------------------------------------
            Timothy J. Wollaeger
            President

  Address: c/o Sutter Corporation
           9425 Chesapeake Drive
           San Diego, CA 92123
           Attn: Timothy J. Wollaeger

           SENTRON MEDICAL, INC.

           By: /s/ Vincent M. Paglino
           ------------------------------------------
           Vincent M. Paglino, Vice President

  Address: c/o Senmed Medical Ventures
           4445 Lake Forest Drive, Suite 600
           Cincinnati, OH 45242


                                       2
<PAGE>   37
                        Biosite Diagnostics Incorporated
            Supplemental Signature Pages to Series E Preferred Stock
                Purchase Agreement dated as of November 25, 1992

                      Second Closing -- December 15, 1992


           MEDICUS VENTURE PARTNERS 1992 A CALIFORNIA
           LIMITED PARTNERSHIP

           By: MEDICUS MANAGEMENT PARTNERS,
               General Partner

           By: /s/ Frederick J. Dotzler
               ---------------------------------------
               Frederick J. Dotzler
               General Partner

   Address:    2180 Sand Hill Road, Suite 400
               Menlo Park, CA 94025

               EUCLID PARTNERS III, L.P., A DELAWARE LIMITED
               PARTNERSHIP

           By: EUCLID ASSOCIATES III, L.P. A DELAWARE
               LIMITED PARTNERSHIP, General Partner

           By: /s/ Stephen K. Reidy
               -----------------------------------------
               Stephen K. Reidy
               General Partner

   Address:    Euclid Partners Corporation
               50 Rockefeller Plaza, Suite 1022
               New York, NY 10020
            
               GREENE FAMILY TRUST

           By: /s/ Howard E. Greene, Jr.
               -------------------------------------------
               Howard E. Greene, Jr.
               Trustee

   Address:    c/o Amylin Pharmaceuticals, Inc.
               9373 Towne Center Drive, Suite 250
               San Diego, CA 92121
               Attn: Howard E. Greene, Jr.


                                       3
<PAGE>   38
                        Biosite Diagnostics Incorporated
            Supplemental Signature Pages to Series E Preferred Stock
                Purchase Agreement dated as of November 25, 1992

                      Second Closing -- December 15, 1992


               Wyverne A. Blickenstaff

               /s/ Wyverne A. Blickenstaff
               --------------------------------------------

 Address:      RR # 1
               East Peoria, Illinois 61611

               Betty J. Blickenstaff
               /s/ Betty J. Blickenstaff
               --------------------------------------------

Address:      RR # 1
              East Peoria, Illinois 61611

              Peter Preuss
              /s/ Peter Preuss
              ---------------------------------------------

Address:     201 Lomas Santa Fe Drive
             Suite 340
             Solana Beach, CA 92075

             Henry W. Goodwin
             /s/ Henry W. Goodwin
             ----------------------------------------------

Address:     2923 Kings Forest Drive
             Kingwood, TX 77339

             M. David White
             /s/ M. David White
             ----------------------------------------------

Address:    5405 Huckelberry
            Houston, TX 77056


                                       4
<PAGE>   39
                        Biosite Diagnostics Incorporated
            Supplemental Signature Pages to Series E Preferred Stock
                Purchase Agreement dated as of November 25, 1992

                      Second Closing -- December 15, 1992


            Stephen I. Chazen

            /s/ Stephen I. Chazen
            ----------------------------------------------

Address:   Dellwood Parkway East
           Madison, NJ 07940

           Thomas H. Patrick

           /s/ Thomas H. Patrick
           ----------------------------------------------

Address:   122 Brinker Road
           Barrington Hills, IL 60010

           John L. Steffens

           /s/ John L. Steffens
           ----------------------------------------------

Address:  358 Wendover
          Princeton, NJ 08540

          Charles A. Lewis

          /s/ Charles A. Lewis
          -----------------------------------------------

Address:  1501 Asbury Avenue
          Evanston, IL 60201


                                       5
<PAGE>   40

                        BIOSITE DIAGNOSTICS INCORPORATED
                            Series E Preferred Stock
                       Second Closing - December 15, 1992
                              Supplement No. 1 To
                                   Schedule A
                             SCHEDULE OF INVESTORS

<TABLE>
<CAPTION>
                                                   Number          Aggregate
        Investors                                of Shares       Purchase Price
        ---------                                ---------       --------------
<S>                                               <C>            <C>
Kleiner Perkins Caufield & Byers V                 31,250        $ 150,000.00
CHC Venture Co.                                    93,750          450,000.00
Sentron Medical Inc.                               31,250          150,000.00
Medicus Venture Partners 1992                     104,167          500,001.60
Euclid Partners III, L.P.                         104,167          500,001.60
Greene Family Trust                                10,417           50,001.60
Wyverne A. and Betty J. Blickenstaff                2,000            9,600.00
Peter Preuss                                       10,417           50,001.60
Henry W. Goodwin                                    4,875           23,400.00
John L. Steffens                                    4,875           23,400.00
M. David White                                      4,874           23,395.20
Stephen I. Chazen                                   4,875           23,400.00
Thomas H. Patrick                                   4,875           23,400.00
Charles A. Lewis                                    4,875           23,400.00
                                                  -------        ------------
        Total                                     416,667        $2,000,001.60
                                                  =======        =============

</TABLE>


                                      A-1

<PAGE>   1
 
                                                                    EXHIBIT 11.1
 
                 STATEMENT OF COMPUTATION OF EARNINGS PER SHARE
                 (AMOUNTS IN THOUSANDS, EXCEPT PER SHARE DATA)
 
<TABLE>
<CAPTION>
                                                                                 NINE MONTHS ENDED
                                                  YEAR ENDED DECEMBER 31,          SEPTEMBER 30,
                                                ----------------------------     -----------------
                                                 1993       1994       1995                  1996
                                                ------     ------     ------      1995      ------
                                                                                 ------
                                                                                 (UNAUDITED)
<S>                                             <C>        <C>        <C>        <C>        <C>
Net income (loss).............................  $ (426)    $2,356     $7,908     $5,028     $2,613
                                                ======     ======     ======     ======     ======
Weighted average common shares outstanding....   1,144      1,153      1,225      1,184      1,420
Net effect of dilutive common share
  equivalents (stock options) using the
  treasury stock method.......................      --        446        564        583        366
Effect of assumed conversion of preferred
  shares......................................   8,329      8,329      8,329      8,329      8,329
Effective of assumed conversion of convertible
  debenture...................................      --         --         23         --         92
Adjustments to reflect requirements of the
  Securities and Exchange Commission (Effect
  of SAB 83)..................................     625        625        625        625        625
                                                ------     ------     ------     ------     ------
  Adjusted shares outstanding.................  10,098     10,553     10,766     10,721     10,832
                                                ======     ======     ======     ======     ======
Pro forma net income (loss) per share.........  $(0.04)    $ 0.22     $ 0.74     $ 0.47     $ 0.24
                                                ======     ======     ======     ======     ======
</TABLE>

<PAGE>   1
 
                                                                    EXHIBIT 23.1
 
               CONSENT OF ERNST & YOUNG LLP, INDEPENDENT AUDITORS
 
     We consent to the reference to our firm under the captions "Experts" and
"Selected Financial Data" and to the use of our report dated November 12, 1996,
except for Note 7, as to which the date is December 5, 1996, in the Registration
Statement on Form S-1 and related Prospectus of Biosite Diagnostics Incorporated
for the registration of 2,300,000 shares of its common stock.
 
                                          ERNST & YOUNG LLP
 
San Diego, California
December 11, 1996

<TABLE> <S> <C>

<ARTICLE> 5
<LEGEND>
This schedule contains summary financial information extracted from The
Registrant's Financial Statements as of and for the year ended December 31, 1995
and as of and for the nine months ended September 30, 1996. And is qualified in
its entirety by reference to such Financial Statements
</LEGEND>
<MULTIPLIER> 1,000
<CURRENCY> U.S. DOLLARS
       
<S>                             <C>                      <C>
<PERIOD-TYPE>                   YEAR                     9-MOS
<FISCAL-YEAR-END>                          DEC-31-1995             SEP-30-1996
<PERIOD-START>                             JAN-01-1995             JAN-01-1996
<PERIOD-END>                               DEC-31-1995             SEP-30-1996
<EXCHANGE-RATE>                                      1                       1
<CASH>                                           2,276                   1,410
<SECURITIES>                                    11,703                   8,759
<RECEIVABLES>                                    3,943                   4,531
<ALLOWANCES>                                         0                       0
<INVENTORY>                                      1,689                   1,709
<CURRENT-ASSETS>                                21,098                  18,520
<PP&E>                                           6,868                   8,247
<DEPRECIATION>                                   3,268                   4,306
<TOTAL-ASSETS>                                  27,935                  28,968
<CURRENT-LIABILITIES>                            6,670                   4,553
<BONDS>                                          2,739                   3,234
                                0                       0
                                         83                      83
<COMMON>                                            14                      15
<OTHER-SE>                                      18,429                  21,083
<TOTAL-LIABILITY-AND-EQUITY>                    27,935                  28,968
<SALES>                                         25,147                  20,225
<TOTAL-REVENUES>                                26,794                  21,667
<CGS>                                            5,649                   4,318
<TOTAL-COSTS>                                   13,687                  12,632
<OTHER-EXPENSES>                                 1,217                   2,368
<LOSS-PROVISION>                                     0                       0
<INTEREST-EXPENSE>                                   0                       0
<INCOME-PRETAX>                                  6,241                   2,349
<INCOME-TAX>                                   (1,667)                   (264)
<INCOME-CONTINUING>                              7,908                   2,613
<DISCONTINUED>                                       0                       0
<EXTRAORDINARY>                                      0                       0
<CHANGES>                                            0                       0
<NET-INCOME>                                     7,908                   2,613
<EPS-PRIMARY>                                     0.74                    0.24
<EPS-DILUTED>                                     0.74                    0.24
<FN>
Earnings per share is calculated based upon pro forma shares outstanding.
See Note 1 of Notes to Financial Statements.
</FN>
        


</TABLE>


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