BIOSITE DIAGNOSTICS INC
10-Q, 1999-05-12
IN VITRO & IN VIVO DIAGNOSTIC SUBSTANCES
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                UNITED STATES SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                   FORM 10-Q

(Mark One)

/X/  QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES 
     EXCHANGE ACT OF 1934

For the quarterly period ended March 31, 1999

                                       OR

/ /  TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES
     EXCHANGE ACT OF 1934


For the transition period from __________ to __________
                                       
                        Commission file number 000-21873

                        BIOSITE DIAGNOSTICS INCORPORATED
             (EXACT NAME OF REGISTRANT AS SPECIFIED IN ITS CHARTER)


                Delaware                                 33-0288606
      [State or other jurisdiction          [I.R.S. Employer Identification No.]
   of incorporation or organization]
          11030 Roselle Street
          San Diego, California                             92121
 [Address of principal executive offices]                 [Zip Code]
                                       
       Registrant's telephone number, including area code: (619) 455-4808


     Indicate by check mark whether the Registrant (1) has filed all reports
required to be filed by Section 13 or 15(d) of the Securities Exchange Act of
1934 during the preceding 12 months (or for such shorter period that the
Registrant was required to file such reports), and (2) has been subject to such
filing requirements for the past 90 days.     Yes   X       No
                                                   ---          ---
                                       
The number of shares of the Registrant's Common Stock, $0.01 par value, 
                  outstanding at April 30, 1999 was 13,040,963

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<PAGE>
                                       
                        BIOSITE DIAGNOSTICS INCORPORATED
                                   FORM 10-Q

                                     INDEX
<TABLE>
<CAPTION>
                                                                                                    PAGE
                                                                                                    ----
<S>                                                                                              <C>
PART I.  FINANCIAL INFORMATION


Item 1.         Financial Statements:
                Condensed Balance Sheets as of March 31, 1999 (Unaudited)
                  and  December 31, 1998.......................................................         1
                Condensed Statements of Operations (Unaudited) for the three months
                  ended March 31, 1999 and 1998................................................         2
                Condensed Statements of Cash Flows (Unaudited) for the three
                  months ended March 31, 1999 and 1998.........................................         3
                Notes to Condensed Financial Statements (Unaudited)............................         4

Item 2.         Management's Discussion and Analysis of Financial Condition and
                  Results of Operations........................................................         6

Item 2a.        Quantitative and Qualitative Disclosure about Market Risk......................        11


PART II. OTHER INFORMATION


Item 1.         Legal Proceedings..............................................................        18

Item 2.         Changes in Securities and Use of Proceeds......................................  Not Applicable

Item 3.         Defaults Upon Senior Securities................................................  Not Applicable

Item 4.         Submission of Matters to a Vote of Security Holders............................  Not Applicable

Item 5.         Other Information..............................................................  Not Applicable

Item 6.         Exhibits and Reports on Form 8-K...............................................        18


Signatures      ...............................................................................        19
</TABLE>

<PAGE>
                                       
PART I.  FINANCIAL INFORMATION

ITEM 1.  FINANCIAL STATEMENTS

                        BIOSITE DIAGNOSTICS INCORPORATED

                            CONDENSED BALANCE SHEETS
<TABLE>
<CAPTION>
                                                                              MARCH 31,            DECEMBER 31,
                                                                                1999                   1998
                                                                            -------------         -------------
                                                                             (Unaudited)              (Note)
<S>                                                                        <C>                    <C>
Assets
Current assets:                                                                                
  Cash and cash equivalents                                                  $  1,757,746          $    762,337
  Marketable securities, available-for-sale                                    30,059,573            33,466,841
  Accounts receivable                                                           6,699,698             6,573,735
  Inventory                                                                     4,822,633             4,364,367
  Other current assets                                                          3,302,953             3,133,960
                                                                            -------------         -------------
        Total current assets                                                   46,642,603            48,301,240
Property, equipment and leasehold improvements,  net                            7,060,594             7,313,673
Patents and license rights, net                                                 7,007,814             7,203,433
Other assets                                                                    4,304,222             2,990,765
                                                                            -------------         -------------
                                                                             $ 65,015,233          $ 65,809,111
                                                                            =============         =============
Liabilities and stockholders' equity 
Current liabilities:
  Accounts payable                                                           $  2,486,197          $  1,503,354
  Accrued salaries and other                                                    3,044,144             2,699,663
  Accrued costs for defense of patent matters                                          --             1,248,191
  Current portion of long-term obligations                                      1,655,367             1,636,265
                                                                            -------------         -------------
        Total current liabilities                                               7,185,708             7,087,473
Long-term obligations                                                           3,921,250             4,038,444
Commitments and contingencies                                                                  
Stockholders' equity:                                                                          
Preferred stock, $.01 par value, 5,000,000 shares authorized, none
  issued and outstanding at March 31, 1999 and December 31, 1998                       --                    --
Common stock, $.01 par value, 25,000,000 shares authorized; 13,002,373
  and 12,926,706 shares issued and outstanding at March 31, 1999 and
  December 31, 1998, respectively                                                 130,024               129,267
Additional paid-in capital                                                     54,531,955            54,250,324
Unrealized net gain on marketable securities, net of related tax effect             7,840                35,266
Deferred compensation                                                            (180,784)             (207,845)
Accumulated deficit                                                              (580,760)              476,182
                                                                            -------------         -------------
        Total stockholders' equity                                             53,908,275            54,683,194
                                                                            -------------         -------------
                                                                             $ 65,015,233          $ 65,809,111
                                                                            =============         =============
</TABLE>
Note:    The balance sheet at December 31, 1998 has been derived from the
         audited financial statements at that date but does not include all of
         the information and footnotes required by generally accepted accounting
         principles for complete financial statements.

See accompanying notes.

                                      -1-
<PAGE>

                        BIOSITE DIAGNOSTICS INCORPORATED

                       CONDENSED STATEMENTS OF OPERATIONS
                                   (UNAUDITED)
<TABLE>
<CAPTION>
                                                                   THREE MONTHS ENDED MARCH 31,
                                                                    1999                  1998
                                                                ------------          ------------
<S>                                                             <C>                   <C>
        Net sales                                               $  9,447,721          $ 7,883,961
        Cost of sales                                              3,741,917            1,755,061
                                                                ------------          ------------
        Gross profit                                               5,705,804            6,128,900

        Operating Expenses:
           Selling, general and administrative                     4,945,059            3,951,424
           Research and development                                3,045,235            2,964,702
           Defense of patent matters                                      --              849,163
                                                                ------------          ------------
                                                                   7,990,294            7,765,289
                                                                ------------          ------------
        Operating income (loss)                                   (2,284,490)          (1,636,389)

        Other income:
           Interest and other income                                 498,548              611,908
           Contract revenue                                               --              300,000
                                                                ------------          ------------

        Income (loss) before benefit (provision) for
           income taxes                                           (1,785,942)            (724,481)
        Benefit (provision) for income taxes                         729,000              224,000
                                                                ------------          ------------

        Net income (loss)                                       $ (1,056,942)         $  (500,481)
                                                                =============         ============

        Net income (loss) per share
          - Basic                                               $      (0.08)         $     (0.04)
                                                                =============         ============
          - Diluted                                             $      (0.08)         $     (0.04)
                                                                =============         ============

        Shares used in calculating per share amounts
          - Basic                                                 12,973,000           12,906,000
                                                                =============         ============
          - Diluted                                               12,973,000           12,906,000
                                                                =============         ============
</TABLE>
        See accompanying notes.

                                       -2-

<PAGE>
                                       
                        BIOSITE DIAGNOSTICS INCORPORATED

                       CONDENSED STATEMENTS OF CASH FLOWS
                                   (UNAUDITED)
<TABLE>
<CAPTION>
                                                                            THREE MONTHS ENDED MARCH 31,  
                                                                         ---------------------------------
                                                                              1999               1998
                                                                         --------------     --------------
<S>                                                                      <C>                <C>
OPERATING ACTIVITIES                                                                       
Net cash provided by (used in) operating activities                       $   (505,148)     $   1,339,982

INVESTING ACTIVITIES
Proceeds from sales and maturities of marketable securities                  9,716,659         12,364,404
Purchase of marketable securities                                           (6,355,101)       (13,851,677)
Purchase of property, equipment and leasehold improvements                    (456,840)        (1,178,922)
Patents, license rights, deposits and other assets                          (1,588,457)           407,344
                                                                          ------------      -------------
Net cash provided by (used in) investing activities                          1,316,261         (2,258,851)

FINANCING ACTIVITIES
Proceeds from issuance of financing obligations                                326,121            661,406
Principal payments under financing obligations                                (424,213)          (341,600)
Proceeds from issuance of convertible debenture                                     --            500,000
Proceeds from issuance of stock, net                                           282,388             78,093
                                                                          ------------      -------------
Net cash provided by financing activities                                      184,296            897,899
                                                                          ------------      -------------

Increase (decrease) in cash and cash equivalents                               995,409            (20,970)
Cash and cash equivalents at beginning of period                               762,337          2,330,274
                                                                          ------------      -------------
Cash and cash equivalents at end of period                                $  1,757,746      $   2,309,304
                                                                          ============      =============

SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:

  Interest paid                                                           $    110,241      $     103,721
                                                                          ============      =============
  Income taxes  paid                                                      $         --      $       4,800
                                                                          ============      =============

SUPPLEMENTAL SCHEDULE OF NON-CASH INVESTING AND FINANCING ACTIVITIES:
  Conversion of convertible debenture into common stock                   $         --      $     499,992
                                                                          ============      =============
</TABLE>

      See accompanying notes.

                                      -3-
<PAGE>

                        BIOSITE DIAGNOSTICS INCORPORATED

               NOTES TO CONDENSED FINANCIAL STATEMENTS (UNAUDITED)

1.  BASIS OF PRESENTATION

    The accompanying unaudited condensed financial statements have been 
prepared in accordance with both generally accepted accounting principles for 
interim financial information, and the instructions to Form 10-Q and Article 
10 of Regulation S-X. Accordingly, they do not include all of the information 
and footnotes required by generally accepted accounting principles for 
complete financial statements. The accompanying financial statements reflect 
all adjustments (consisting of normal recurring accruals) which are, in the 
opinion of management, considered necessary for a fair presentation of the 
results for the interim periods presented. Interim results are not 
necessarily indicative of results for a full year. The Company has 
experienced significant quarterly fluctuations in operating results and it 
expects that these fluctuations in sales, expenses and net income or losses 
will continue.

    The financial statements and related disclosures have been prepared with 
the presumption that users of the interim financial information have read or 
have access to the audited financial statements for the preceding fiscal 
year. Accordingly, these financial statements should be read in conjunction 
with the audited financial statements and the related notes thereto contained 
in the Company's Annual Report on Form 10-K for the year ended December 31, 
1998.

2.  EARNINGS PER SHARE

    In February 1997, the Financial Accounting Standards Board issued 
Statement of Financial Accounting Standards No. 128, Earnings per Share 
("Statement No. 128"). Statement No. 128 applies to entities with publicly 
held common stock or potential common stock and is effective for financial 
statements issued for periods ending after December 15, 1997. Statement No. 
128 replaces APB Opinion 15, Earnings per Share ("EPS"). Statement No. 128 
requires dual presentation of basic and diluted earnings per share by 
entities with complex capital structures. Basic EPS includes no dilution and 
is computed by dividing net income by the weighted average number of common 
shares outstanding for the period. Diluted EPS reflects the potential 
dilution of securities that could share in the earnings of the Company such 
as common stock which may be issuable upon exercise of outstanding common 
stock options.

    Shares used in calculating basic and diluted earnings per share were as 
follows:
<TABLE>
<CAPTION>
                                                                 Three months ended March 31,
                                                                      1999            1998
                                                                ---------------  -------------
<S>                                                             <C>              <C>
Shares used in calculating per share amounts -- Basic
   (Weighted average common shares outstanding )                   12,973            12,906

Effect of common share equivalents:
  Net effect of dilutive common stock options using the
   treasury stock method                                               --                --
                                                                ===============  =============
Shares used in calculating per share amounts -- Diluted             12,973            12,906
                                                                ===============  =============
</TABLE>

                                     -4-

<PAGE>

3.  BALANCE SHEET INFORMATION

     Inventories consist of the following:
<TABLE>
<CAPTION>
                                                   MARCH 31,      DECEMBER 31,
                                                     1999             1998
                                                  -----------     -----------
<S>                                               <C>             <C>
       Raw materials                              $ 1,483,369     $ 1,405,176
       Work-in-process                              3,035,899       2,938,548
       Finished goods                                 303,365          20,643
                                                  -----------     -----------
                                                  $ 4,822,633     $ 4,364,367
                                                  ===========     ===========
</TABLE>


4.  COMPREHENSIVE INCOME

Effective January 1, 1998, the Company adopted the Financial Accounting 
Standards Board's Statement No. 130, Comprehensive Income, ("SFAS 130"). SFAS 
130 establishes new rules for the reporting and display of comprehensive 
income and its components, however, the adoption of SFAS 130 had no impact on 
the Company's net income or stockholder's equity. SFAS 130 requires the 
change in net unrealized gains or losses on marketable securities be included 
in comprehensive income. As adjusted for this item, comprehensive income is 
as follows:
<TABLE>
<CAPTION>
                                                                   THREE MONTHS ENDED MARCH 31,
                                                                    1999                  1998
                                                                ------------          -----------
<S>                                                             <C>                   <C>
        Net income (loss)                                       $ (1,056,942)         $  (500,481)
        Change in unrealized net gain (loss) on marketable
           securities, net of tax                                     27,426              (20,174)
                                                                ------------          -----------
        Comprehensive income

                                                                $  1,029,516          $  (520,655)
                                                                ============          ===========
</TABLE>

                                      -5-
<PAGE>

PART I. FINANCIAL INFORMATION

ITEM 2. MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS
        OF OPERATIONS.

    The matters discussed in this Management's Discussion and Analysis of 
Financial Condition and Results of Operations contain forward-looking 
statements that involve risks and uncertainties, including the timely 
development, introduction and acceptance of new products, manufacturing 
scale-up and efficiency issues, dependence on others, the impact of 
competitive products, third party reimbursement issues, changing market 
conditions and the other risks detailed under "Factors that May Affect 
Results" and throughout the Company's Annual Report on Form 10-K for the year 
ended December 31, 1998. Actual results may differ materially from those 
projected. These forward-looking statements represent the Company's judgment 
as of the date of the filing of this Form 10-Q and its Form 10-K, 
respectively. The Company disclaims any intent or obligation to update these 
forward-looking statements.

OVERVIEW

    Biosite Diagnostics Incorporated (the "Company") was established in 1988. 
The Company has been primarily involved in the research, development, 
manufacturing and marketing of rapid diagnostic tests. In 1992, the Company 
began commercial sales of the Company's primary product, the Triage Panel for 
Drugs of Abuse ("Triage DOA Panel"). In 1998, the Company began selling three 
additional products, the Triage C. DIFFICILE Panel, the Triage Parasite Panel 
and the Triage Cardiac System. The Company markets the products worldwide 
primarily through distributors supported by the Company's direct sales force. 
The Company's principal markets are hospital laboratories and emergency 
departments. In addition to focusing its attention on commercial activities 
associated with these products, the Company continues to invest in the 
research and development of additional rapid tests designed to aid in the 
diagnosis of several critical diseases or conditions, including congestive 
heart failure and certain bacterial infections. The Company is also 
developing a diagnostic test to aid in the dosing of immunosuppressant drugs. 

    The Company incurred an operating loss during the last six quarters. The 
Company may not return to operating profitability on a quarterly or annual 
basis in the future. 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, manufacturing 
scale-up issues, manufacturing inefficiencies or delays, regulatory delays, 
product recalls, shipment problems, seasonal customer demand, the timing or 
cancellation of significant orders, changes in reimbursement policies, 
competitive pressures on average selling prices and changes in the mix of 
products sold.

    As a result of manufacturing scale-up and capacity constraint issues 
related to the production of the Triage Cardiac System, the Company developed 
a backlog of orders for the Triage Cardiac System during the third and fourth 
quarters of 1998. The Company addressed the manufacturing scale-up and 
capacity constraint issues and filled the backlog orders during December 1998 
and the first quarter of 1999. During the first quarter of 1999, the Company 
encountered manufacturing inefficiencies related to the production of the 
Triage Cardiac System. The Company manufactures and ships its other products 
shortly after receipt of orders and has not developed a significant backlog 
for such products and does not anticipate it will develop a material backlog 
for such products in the future.

    Because the Company is continuing to increase its operating expenses, 
primarily for personnel and activities supporting newly-introduced products 
and new product development, the Company's operating results would be 
adversely affected if its sales or gross profit did not correspondingly 
increase or if its product development efforts were unsuccessful or are 
subject to delays. The Company's limited operating history makes accurate 
prediction of future operating results difficult or impossible. The Company 
may not sustain revenue growth or return to profitability on a quarterly or 
annual basis and its operating results may not be consistent with predictions 
made by securities analysts.

                                      -6-
<PAGE>

RECENT DEVELOPMENTS

BIOSITE DISCOVERY PROGRAM

    In March 1999, the Company introduced its Biosite Discovery program, a 
collaborative research and diagnostics development program focused on the 
identification of new protein markers for acute diseases. The Company will 
seek to use its expertise in antibody development to help pharmaceutical and 
biotechnology partners accelerate their research programs. In return, Biosite 
intends to obtain diagnostic rights to the proteins under study. Biosite will 
utilize its proprietary Omniclonal(TM) antibody development technology to 
develop high affinity antibodies for the characterization and validation of 
protein targets. Initially, Biosite will focus on disease target markers in 
four core areas: cardiovascular, cerebrovascular, infectious disease and 
oncology. If the diagnostic utility of a marker is established, it will then 
be assessed for commercialization potential, with high value markers being 
added to Biosite's product development pipeline. The Company executed its 
first collaborative agreement under the Biosite Discovery program in the 
cardiovascular area with Scios Inc. in November 1998.

LITIGATION

    In September 1997, Behring Diagnostics, Inc. and Behring Diagnostics, 
GmbH filed a patent infringement action against the Company in the U.S. 
District Court for the District of Delaware. The patent infringement action 
alleged that the Company's Triage DOA Panel products infringed a patent held 
by the plaintiffs, which expires in August 2000. The plaintiffs sought to 
recover damages of an unspecified amount and to enjoin future sales of the 
Triage DOA Panel products by the Company. Biosite answered the complaint, 
denying infringement and asserting affirmative defenses that the patent is 
invalid and unenforceable. Because of a merger, the identity of the 
plaintiffs changed to Dade Behring Inc., Dade Behring Marburg GmbH and Syva 
Company (collectively "Dade Behring"). To avoid protracted litigation and 
continued significant legal defense costs, the Company and Dade Behring 
executed a settlement agreement in March 1999 that resolved all disputes 
outstanding between the companies. Under the terms of the settlement 
agreement, the Company obtained a license to the patent and will provide Dade 
Behring the option to evaluate certain proprietary technology. The terms of 
the settlement resulted in a net payment of $1,050,000 to Dade Behring by 
Biosite.

    On April 28, 1998, Spectral Diagnostics, Inc. ("Spectral") filed a patent 
infringement action against the Company in the U.S. District Court for the 
Western District of Wisconsin, alleging that the Company's Triage Cardiac 
Panel infringed U.S. patent 5,744,358 which was issued on the date the suit 
was filed. Spectral sought a permanent injunction and damages. Spectral also 
sought a preliminary injunction that would enjoin the Company from selling 
the Triage Cardiac Panel. On July 16, 1998, the Court issued an opinion 
denying the motion for a preliminary injunction. Spectral also moved for 
partial summary judgment on the issue of infringement. That motion was denied 
on July 20, 1998. The established trial date of August 31, 1998 was set aside 
while the two companies engaged in negotiations in an attempt to arrive at a 
settlement in regards to all disputes outstanding between Biosite and 
Spectral. In February 1999, a settlement agreement was executed that resolved 
all disputes between the companies without a material adverse financial 
impact to Biosite.

                                      -7-

<PAGE>

RESULTS OF OPERATIONS

The following table sets forth certain operating data as a percentage of net 
sales:

<TABLE>
<CAPTION>
                                                          THREE MONTHS ENDED
                                                              MARCH 31,
                                                          1999          1998
                                                      ------------  ------------
        <S>                                           <C>           <C>
        Net sales.................................        100%           100%
        Cost of sales.............................         40             22
                                                      ------------  ------------
        Gross profit..............................         60             78

        Operating Expenses:

         Selling, general and administrative......         52             50
         Research and development.................         32             38
         Defense of patent matters................         --             11
                                                      ------------  ------------
        Total operating expenses..................         85             99

        Income (loss) from operations.............        (24)           (21)
        Interest and other income, net............          5             12
                                                      ------------  ------------

        Income (loss) before benefit (provision)
          for income taxes........................        (19)           (9)
        Benefit (provision) for income taxes......          8             3
                                                      ------------  ------------
        Net income (loss).........................        (11)%          (6)%
                                                      ------------  ------------
                                                      ------------  ------------
</TABLE>

    NET SALES. Net sales increased 20% to $9.4 million for the three months 
ended March 31, 1999 from $7.9 million for the three months ended March 31, 
1998. The increase was primarily attributable to the introduction of new 
products. The Triage C. DIFFICILE Panel and Triage Parasite Panel were 
launched in March 1998 and October 1998, respectively. The Triage Cardiac 
System was introduced in May 1998. Net sales for the new products were 
approximately $1.6 million for the first quarter of 1999, as compared to 
$53,000 for the same period in 1998. Net sales of the Triage DOA Panel for 
the first quarter of 1999 were consistent with net sales of the product for 
the same period in 1998. The Company believes that the growth in sales of the 
Triage DOA Panel products has slowed and may begin to decline as the 
available U.S. market becomes saturated and competitive pressures become more 
prominent in a maturing market.

    GROSS PROFIT. Gross profit decreased 7% to $5.7 million for the first 
quarter of 1999 from $6.1 million for the same period in 1998. The overall 
gross margin decreased to 60% for the first quarter of 1999 from 78% for the 
same period in 1998. Gross margins decreased primarily as a result of the 
introduction of the Triage C. DIFFICILE and Parasite Panels and the Triage 
Cardiac System, which experienced lower gross margins than the Triage DOA 
Panel. During the first quarter, the Company experienced significant 
inefficiencies related to the production of the Triage Cardiac System, 
resulting in negative gross profits related to this product. The new products 
are expected to continue to realize lower or negative gross margins during 
the early stages of their commercialization as incremental manufacturing 
costs are spread over smaller sales volumes and manufacturing scale-up, 
capacity constraint, and efficiency issues are addressed. The Company also 
expects the overall gross margins to continue to decrease as compared to 1998 
as a result of both competitive pricing pressures related to the maturing 
Triage DOA product line, and the incremental manufacturing costs associated 
with new products until economies of scale can be achieved with the new 
products and until other manufacturing scale-up and efficiency issues are 
addressed.

    SELLING, GENERAL AND ADMINISTRATIVE EXPENSES. Selling, general and 
administrative expenses increased 25% to $4.9 million for the first quarter 
of 1999 from $4.0 million for the first quarter of 1998. The 1999 increases 
resulted primarily from non-recurring administrative costs associated with 
reorganization of the Company's manufacturing operations totaling 
approximately $300,000. The Company also expended approximately $425,000. 
related to a business development opportunity that the Company has since 
decided to forego. Other increases in expenses were associated with 
additional marketing activities associated with new products, the expanded 
sales activities related to the Company's broader product lines and the 
increased administrative costs to support the Company's expanded operations 
and business development activities. The Company expects selling, general and 
administrative costs in 1999 to be significantly higher than in 1998, as the 
Company continues to expand its overall operations, including sales and 
marketing activities for the Company's new products, business development 
activities and administrative 

                                     -8-
<PAGE>

support functions. The timing of such increased expenditures and their 
magnitude are primarily dependent on the commercial success and sales growth 
of the Company's new products, the progress of business development 
activities, and domestic and international marketing and distribution 
strategies.

    RESEARCH AND DEVELOPMENT EXPENSES. Research and development expenses were 
approximately $3.0 million for the three months ended March 31, 1999, 
consistent with the same period in 1998. During the first quarter of 1999, 
the Company's research and development resources were focused primarily on 
the development and clinical studies of the Triage BNP System and Triage LBP 
System, development of the Triage Enteric Panel, potential improvements to 
the Triage Cardiac System and Triage Micro Panel products and research 
activities associated with the Biosite Discovery Program. Significant 
activities in the first quarter of 1998 related to manufacturing scale-up 
activities for the Triage Cardiac System and Triage C. DIFFICILE Panel. The 
Company expects that its research and development expenses will increase in 
1999, as compared to 1998 levels. The increased expenditures are expected to 
primarily relate to pre-clinical and clinical studies, product development 
efforts, the Biosite Discovery program and manufacturing scale-up activities. 
The Company initiated clinical trials for its Triage BNP System and Triage 
LBP System in late December and expects such clinical trials to extend into 
the third quarter of 1999. The costs associated with such clinical trials is 
expected to be significant. These potential products are subject to more 
complex regulatory approval requirements than the Company's previous 
products. The Company also may resume clinical trials for its NeoralChek 
System during the second half of 1999. The timing of the increased 
expenditures and their magnitude are primarily dependent on the progress and 
success of the research and development and the timing of potential product 
launches.

    DEFENSE OF PATENT MATTERS. Legal expenses associated with the Dade 
Behring and Spectral litigation totaled $849,000 for the first quarter of 
1998. Settlement agreements were executed during the first quarter of 1999 
that resolved both matters. In February 1999, a settlement agreement was 
executed that resolved all disputes between Spectral Diagnostics and the 
Company without a material adverse financial impact to Biosite. In March 
1999, to avoid protracted litigation and continued significant legal defense 
costs, the Company and Dade Behring executed a settlement agreement that 
resolved all disputes outstanding between the companies.

    INTEREST AND OTHER INCOME. Interest income decreased 16% to $499,000 for 
the three months ended March 31, 1999 from $595,000 for the same period in 
1998. The decrease resulted primarily from the lower average balance of cash 
and marketable securities during the first quarter of 1999 as compared to the 
same period in 1998. No contract revenue was recognized in the first quarter 
of 1999 while contract revenues recognized in the first quarter of 1998 
consisted of $300,000 from Novartis Pharma AG related to the development of 
the NeoralChek System.

    BENEFIT (PROVISION) FOR INCOME TAXES. The Company recorded a benefit for 
income taxes of $729,000 and for the same period in 1998, the Company 
recorded a benefit for income taxes of $224,000. At March 31, 1999, the 
Company has net deferred tax assets of $4,724,000; however, due to the fact 
that the Company has incurred operating losses in 1998 and through the first 
quarter of 1999, the Company will continue to evaluate the realizability of 
its net deferred tax assets. If realization becomes uncertain, a valuation 
allowance will be established against previously recognized deferred tax 
assets.

LIQUIDITY AND CAPITAL RESOURCES

    The Company has historically financed its operations through revenues 
from operations, private and public placements of equity securities, 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 $1.5 million from the issuance of convertible debentures. In 
February 1997, the Company raised approximately $29.8 million in net cash 
proceeds from its initial public offering of common stock. At March 31, 1999, 
the Company had cash, cash equivalents and marketable securities of 
approximately $31.8 million compared to $34.2 million at December 31, 1998.

    The decrease in cash, cash equivalents and marketable securities during 
the three months ended March 31, 1999 is largely attributable to the net 
payment of $1,050,000 made to Dade Behring as part of the settlement of 
litigation between Dade Behring and Biosite in March 1999. Cash used in 
operating activities totaled $505,000 for the 

                                     -9-
<PAGE>

quarter compared to net cash generated from operating activities of 
$1,340,000 for the quarter ended March 31, 1998. Other significant uses of 
cash during the first quarter of 1999 included deposits and purchases of 
equipment and leasehold improvements totaling approximately $1 million. 
Proceeds from the sale of marketable securities that were not reinvested in 
other marketable securities totaled approximately $3.4 million and were used 
to meet the cash requirements of the Company during the first quarter of 1999.

    Significant sources of cash, cash equivalents and marketable securities 
for the quarter ended March 31, 1998 included proceeds from the issuance of a 
convertible debenture to Novartis for $500,000 (which was immediately 
converted into common stock) and the receipt of $661,000 in proceeds from 
equipment financing. Significant uses of cash, cash equivalents and 
marketable securities for the quarter ended March 31, 1998 included 
expenditures of $1.2 million for capital equipment and leasehold improvements 
and principal payments under equipment financing obligations of $342,000.

    The Company's primary short-term needs for capital, which are subject to 
change, are for the support of its commercialization efforts related to new 
products, potential licensing of certain technologies patented by others, 
potential procurement and enforcement of patents, expansion of its 
manufacturing capacity and efficiency for new products, potential repurchase 
of the Company's common stock and the continued advancement of research and 
development efforts. The Company executed agreements to license technologies 
patented by others which call for cash payments and future royalties based on 
product sales utilizing the licensed technologies. The Company may enter into 
additional licensing agreements which may include cash payments and future 
royalties based on product sales utilizing the licensed technologies. The 
Company utilizes credit arrangements with financial institutions to finance 
the purchase of capital equipment. As of March 31, 1999, the Company had an 
equipment financing line of credit with a financial institution totaling $4.0 
million, of which $2.4 million was available for future borrowing. The line 
of credit expires on June 30, 1999. Additionally, the Company may utilize 
cash generated from operating activities, if any, to meet its capital 
requirements.

    The Company is evaluating various alternatives in addressing its future 
facilities expansion needs. The alternatives being evaluated include 
negotiations with various parties for the leasing of additional facility 
space and potentially a new campus corporate facility to be constructed in 
San Diego, which would be adequate for the Company's foreseeable future 
needs. If a new campus corporate facility is constructed to meet future 
needs, the Company would not anticipate relocating its operations to the new 
facility prior to January 2001. Relocation to a new facility or leasing of 
additional facility space would be expected to result in an increase in rent 
upon occupancy.

    The Company believes that its available cash, cash from operations and 
funds from existing credit arrangements will be sufficient to satisfy its 
funding needs for at least the next 24 months. Thereafter, if cash generated 
from operations is insufficient to satisfy the Company's working capital and 
capital expenditure requirements, the Company may be required to sell 
additional equity or debt securities or obtain additional credit facilities. 
There can be no assurance that such additional capital, if needed, will be 
available on satisfactory terms, if at all. Furthermore, any additional 
equity financing may be dilutive to stockholders, and debt financing, if 
available, may include restrictive covenants. The Company's future liquidity 
and capital funding requirements will depend on numerous factors, including 
the extent to which the Company's new products and products under development 
are successfully developed, gain market acceptance and become and remain 
competitive, the timing and results of clinical studies and regulatory 
actions regarding the Company's potential products, the costs and timing of 
further expansion of sales, marketing and manufacturing activities, 
facilities expansion needs, and the costs and timing associated with business 
development activities, including potential licensing of certain technologies 
patented by others. 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.

IMPACT OF YEAR 2000 ("Y2K") ISSUE

    The Company is implementing a plan to ensure its system, software and 
facilities infrastructure will function properly with respect to dates in the 
year 2000 and thereafter. Key financial, information and operational systems 
have been assessed and approximately 90% of them have been verified as being 
compliant. The Company is on schedule to have all remaining systems verified 
as compliant by June 30, 1999. All key suppliers, distributors, financial 
institutions and others with whom it does business have been contacted by the 
Company to assess their 

                                     -10-
<PAGE>

Y2K readiness, and approximately 60% have stated that they are compliant or 
will be compliant before December 31, 1999. The Company is continuing to 
communicate with key suppliers, distributors, financial institutions and 
others and believes that their readiness will not pose significant 
operational problems for the Company, nor have a material adverse effect on 
the Company's business. To date the Company has expended less than $35,000 
addressing the Y2K Issue and estimates the total cost of the project and 
contingency plans, if necessary, to be under $50,000. The Company anticipates 
that the Company will be in compliance with Y2K requirements by the end of 
June 1999.

    However, if such modifications and conversions are not made or are not 
completed in a timely fashion, the Y2K Issue could have a material adverse 
impact on the operations of the Company. Additionally, the systems of other 
companies on which Biosite's systems rely may not be timely converted, which 
may have an adverse effect on the Company's systems. The most likely worst 
case scenario is that customers would be unable to order products or pay 
invoices or suppliers would be unable to manufacture or deliver product. This 
would result in reduced orders of products and the inability of the Company 
to manufacture product.

    The Company currently does not have contingency plans in the event it 
does not complete all phases of the Y2K program. Management, however, is 
considering contingency plans which involve, among other actions, manual 
workarounds, increasing inventories of key components to the manufacturing 
process and validating alternate vendors. The Company plans to evaluate the 
status of the contingency plans by June 1999 and determine whether such plans 
are necessary.

The Triage Meter and related software is the only product that the Company 
currently sells which needs evaluation for Y2K readiness, as the other 
products do not process or store any date and time data. The Triage Meter and 
related software has been tested and shown to properly process and store date 
and time data between the 20th and 21st centuries, and the years 1999 and 
2000. This processing and storage included calculating, comparing, displaying 
and recording sequence operations involving date and time data. Correct 
processing of the leap year date and time data has also been demonstrated. 
The software functions as intended or expected, regardless of the date.

ITEM 2A. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

    The Company is exposed to changes in interest rates, primarily from its 
variable-rate long-term debt arrangements and, to a lesser extent, its 
investments in certain available-for-sale marketable securities. Under its 
current policies, the Company does not use interest rate derivatives 
instruments to manage this exposure to interest rate changes. The Company 
does have the option to convert its variable-rate long-term debt arrangements 
to fixed-rate debt arrangements for a nominal transaction fee. At March 31, 
1999, the Company had variable-rate debt totaling $1,922,000. A hypothetical 
1% adverse move in interest rates along the entire interest rate yield curve 
would not materially effect the fair value of the Company's financial 
instruments that are exposed to changes in interest rates.

    Additionally, the Company's purchases of Triage Meters from LRE are 
denominated in German Deutch Marks (DM) and sales of certain products to some 
international customers are denominated in the local currency of customers. 
The Company has on occasion purchased forward exchange contracts to manage 
this exposure to exchange rate changes. As of March 31, 1999, the Company had 
no outstanding forward exchange contracts. Total receivables and payables 
denominated in foreign currencies at March 31, 1999 were not material.

                                     -11-
<PAGE>

FACTORS THAT MAY AFFECT RESULTS

    This report includes certain forward-looking statements about the 
Company's business and results of operations which are subject to risks and 
uncertainties that could cause the Company's actual results to vary 
materially from that indicated from such forward-looking statements. Factors 
that could cause or contribute to such differences include those discussed 
below, as well as those discussed elsewhere herein and in the Company's 
Annual Report on Form 10-K for the year ended December 31, 1998. The factors 
discussed below should be read in conjunction with the risk factors discussed 
in the Company's Annual Report on Form 10-K, which are incorporated by 
reference.

DEPENDENCE ON DEVELOPMENT AND INTRODUCTION OF NEW PRODUCTS FOR REVENUE GROWTH 
AND PROFITABILITY

    Except for the Triage DOA Panel, Triage C. DIFFICILE Panel, Triage 
Parasite Panel and Triage Cardiac System, all of the Company's products are 
still under development and may not be successfully developed or 
commercialized on a timely basis, or at all. If the Company is unable, for 
technological or other reasons, to complete the development, introduction or 
scale-up of manufacturing for 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.

    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. The Company will be required to undertake time-consuming 
and costly development activities and seek regulatory approval for these new 
products. The Company may experience difficulties that could delay or prevent 
the successful development, introduction and marketing of these new products. 
Regulatory clearance or approval of any new products may not be granted by 
the U.S. Food and Drug Administration or foreign regulatory authorities on a 
timely basis, or at all, and the new products may not be successfully 
commercialized. The Company has limited resources to devote to the 
development of all its potential 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, a cost-effective sales force and administrative 
infrastructure and an effective product distribution system for its products.

LIMITED HISTORY OF PROFITABILITY; POTENTIAL QUARTERLY FLUCTUATIONS IN FUTURE 
OPERATING RESULTS

    The Company incurred an operating loss during the last six quarters. The 
Company may not return to operating profitability 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 or capacity constraints, 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 defense and resolution of patent 
matters.

    Operating results would also be adversely affected by a downturn in the 
market for the Company's current and future products, if there are any. 
Because the Company is continuing to increase its operating expenses for 
supporting its expanded sales and marketing activities, manufacturing 
scale-up costs and new product development, the Company's operating results 
would be adversely affected if its sales and gross profits did not 
correspondingly increase or if its product development efforts are 
unsuccessful or subject to delays. The Company's limited operating history 
makes accurate prediction of future operating results difficult or 
impossible. The Company may not sustain revenue growth or remain profitable 
on a quarterly or annual basis and its growth or operating results may not be 
consistent with predictions made by securities analysts.

                                     -12-
<PAGE>

LIMITED MANUFACTURING EXPERIENCE; POTENTIAL INABILITY TO SCALE-UP 
MANUFACTURING

    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 the Triage DOA Panel products. To achieve the level of 
production necessary for commercialization of Biosite's new products and 
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 new Biosite product prior to commercialization, and 
this work may not be completed successfully.

    In addition, although the Company expects some of its new products and 
products under development to share production attributes with the Triage DOA 
Panel, production of these products may require the development of new 
manufacturing technologies and expertise. These products may not be able to 
be manufactured by the Company or any other party at a cost or in quantities 
to make these 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 pre-clinical 
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.

    The Company anticipates making significant expenditures to develop high 
volume manufacturing capabilities required for each of its new products and 
products currently under development, if the products are successfully 
developed. Manufacturing and quality control problems have arisen and may 
arise as the Company attempts to scale-up its manufacturing and such scale-up 
may not be achieved in a timely manner or at a commercially reasonable cost, 
or 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 these facilities 
are subject to QSR requirements of the FDA. The Company or its contractors 
may not 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.

NEAR-TERM DEPENDENCE OF THE COMPANY ON THE TRIAGE DOA PANEL

    To date, sales of the Triage DOA Panel products have accounted for almost 
all of the Company's sales. The Company expects its revenue and profitability 
to substantially depend on the sale of the Triage DOA Panel products for the 
foreseeable future. A reduction in demand for the Triage DOA Panel products 
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 the Triage DOA Panel products is slowing as the available U.S. 
market becomes saturated. Competitive pressures could also erode the 
Company's profit margins for the Triage DOA Panel products. The Company's 
continued growth will depend on its ability to successfully commercialize its 
new products (the Triage C. DIFFICILE Panel, Triage Parasite Panel and Triage 
Cardiac System), develop and commercialize other products, and to gain 
additional acceptance of the Triage DOA Panel products in new market 
segments, such as occupational health.

    During 1998, the Company received FDA approval to market the Triage C. 
DIFFICILE Panel, Triage Parasite Panel and the Triage Cardiac System and 
began selling each of the products in March, October and May, respectively. 
Sales of these new products represented less than 7% of net sales in 1998.

    The Company may not be able to successfully develop and commercialize new 
products, including the Triage C. DIFFICILE Panel, Triage Parasite Panel, and 
Triage Cardiac System, and the Company may not 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.

                                        -13-
<PAGE>

DEPENDENCE ON KEY DISTRIBUTORS; LIMITED DIRECT SALES EXPERIENCE

    The Company relies upon key distributor alliances, such as with Fisher 
HealthCare, to distribute the Triage DOA Panel products, Triage C. DIFFICILE 
Panel, Triage Parasite Panel and Triage Cardiac System and may rely upon 
distributors to distribute products under development. The Triage DOA Panel 
products are currently marketed pursuant to exclusive distribution agreements 
in the U.S. hospital market segment by Fisher (which accounted for 86% of 
product sales in 1998) and internationally by country-specific and regional 
distributors. The loss or termination of one or more of these distributors 
could have a material adverse effect on the Company's sales unless suitable 
alternatives can be arranged.

    If any of the Company's distribution or marketing agreements are 
terminated and the Company is unable to enter into alternative 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 
selling, general and administrative expenses. The Company has limited 
experience in direct sales, marketing and distribution of its products. The 
Company's direct sales, marketing and distribution efforts may not be 
successful. Further, Biosite may not be able to enter into new distribution 
or marketing agreements on satisfactory terms, or at all. A failure to enter 
into acceptable distribution agreements or a failure of the Company to 
successfully market its products would have a material and adverse effect on 
the Company.

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 rapid 
tests, laboratory-based tests and analyzers, as well as clinical reference 
laboratories. Currently, the majority of diagnostic tests used by physicians 
and other health care providers are performed by independent clinical 
reference laboratories 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 
provide cost-effective and time saving alternatives to tests performed by 
clinical reference laboratories or traditional hospital-based laboratory 
procedures. This will require physicians to change their established means of 
having such tests performed. The Company's products may not be able to 
compete with the testing services provided by traditional laboratory services.

    In addition, companies with a significant presence in the diagnostic 
market, such as Abbott Laboratories, Roche Boehringer Mannheim Corporation, 
Bayer Diagnostics, Ortho Clinical Diagnostics, a division of Johnson & 
Johnson, and Dade Behring, 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, these 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. The Company's competitors may 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, 
the Company may not have the financial resources, technical expertise or 
marketing, distribution or support capabilities to compete successfully in 
the future. In addition, competitors, many of which have made substantial 
investments in competing technologies, may be more effective than the Company 
or may 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.

UNCERTAINTY RELATING TO THIRD PARTY REIMBURSEMENT AND POTENTIAL COST 
CONSTRAINTS

In the United States, health care providers that purchase the Triage DOA 
Panel 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 

                                     -14-
<PAGE>

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. Third party 
reimbursement and coverage may not be available or adequate in either U.S. or 
foreign markets, current reimbursement amounts may be decreased in the future 
and future legislation, regulation or reimbursement policies of third-party 
payors may adversely affect the demand for the Company's products or its 
ability to sell its products on a profitable basis.

UNCERTAINTY OF PATENT AND PROPRIETARY TECHNOLOGY PROTECTION; POTENTIAL 
INABILITY TO LICENSE TECHNOLOGY FROM 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 
licenses 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. The Company's pending patent 
applications may not result in the issuance of any patents. Additionally, the 
Company's patent applications may not have priority over others' 
applications, or, if issued, the Company's patents may not offer protection 
against competitors with similar technology. Any patents issued to the 
Company may be challenged, invalidated or circumvented in the future and the 
rights created thereunder may not provide a competitive advantage.

    The Triage DOA Panel, Triage C. DIFFICILE Panel, Triage Parasite Panel, 
Triage Cardiac System 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 some 
technologies and may negotiate to obtain other licenses for technologies 
patented by others. However, the Company may not be able to obtain licenses 
for technology patented by others on commercially reasonable terms, or at 
all. The Company may not be able to develop alternative approaches if it is 
unable to obtain licenses and the Company's current and future licenses may 
not be adequate for the operation of it'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.

    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 

                                     -15-
<PAGE>

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 
claim 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.

    In September 1997, Behring Diagnostics, Inc. and Behring Diagnostics, 
GmbH filed a patent infringement action against the Company in the U.S. 
District Court for the District of Delaware. The patent infringement action 
alleged that the Company's Triage DOA Panel products infringed a patent held 
by the plaintiffs, which expires in August 2000. The plaintiffs sought to 
recover damages of an unspecified amount and to enjoin future sales of the 
Triage DOA Panel products by the Company. Biosite answered the complaint, 
denying infringement and asserting affirmative defenses that the patent is 
invalid and unenforceable. Because of a merger, the identity of the 
plaintiffs changed to Dade Behring Inc., Dade Behring Marburg GmbH and Syva 
Company (collectively "Dade Behring"). To avoid protracted litigation and 
continued significant legal defense costs, the Company and Dade Behring 
executed a settlement agreement in March 1999 that resolved all disputes 
outstanding between the companies. Under the terms of the settlement 
agreement, the Company obtained a license to the patent and will provide Dade 
Behring the option to evaluate certain proprietary technology, resulting in a 
net payment of $1,050,000 to Dade Behring by Biosite. The Company has charged 
to defense of patent matters in the accompanying statements of income the 
applicable license costs related to years prior to 1998.

    On April 28, 1998, Spectral Diagnostics, Inc. ("Spectral") filed a patent 
infringement action against the Company in the U.S. District Court for the 
Western District of Wisconsin, alleging that the Company's Triage Cardiac 
Panel infringed U.S. patent 5,744,358 which was issued on the date the suit 
was filed. Spectral sought a permanent injunction and damages. Spectral also 
sought a preliminary injunction that would enjoin the Company from selling 
the Triage Cardiac Panel. On July 16, 1998, the Court issued an opinion 
denying the motion for a preliminary injunction. Spectral also moved for 
partial summary judgment on the issue of infringement. That motion was denied 
on July 20, 1998. The established trial date of August 31, 1998 was set aside 
while the two companies engaged in negotiations in an attempt to arrive at a 
settlement in regards to all disputes outstanding between Biosite and 
Spectral. In February 1999, a settlement agreement was executed that resolved 
all disputes between the companies without a material adverse financial 
impact to Biosite.

    The Company may become subject to additional 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 
Company also has received correspondence from other parties calling to the 
Company's attention the existence of patents that they believe cover 
technology which is or may be incorporated in Biosite's products and products 
under development. Some of this correspondence has included offers to 
negotiate the licensing of the patented technologies. There can be no 
assurance that these matters will not result in litigation to determine the 
enforceability, scope, and validity of the patents. Litigation, if initiated, 
could seek to recover damages as a result of any sales of the products and to 
enjoin further sales of such products.

    Litigation that could be brought forth by other parties may result in 
material expenses to the Company and significant diversion of effort by the 
Company's technical and management personnel, regardless of the outcome. The 
outcome of litigation is inherently uncertain and there can be no assurance 
that a court would not find the third-party claims valid and that the Company 
had no successful defense to such claims. An adverse outcome in litigation or 
the failure to obtain a necessary license could subject the Company to 
significant liability and could prevent the Company from selling the Triage 
DOA Panel, Triage C. DIFFICILE Panel, Triage Parasite Panel, the Triage 
Cardiac System or other products it may develop, which would 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. Others 
may independently develop substantially equivalent proprietary information 
and techniques or otherwise gain access to the Company's trade secrets or 
disclose such technology, and the Company may not be able to protect its 
trade secrets or 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 

                                     -16-
<PAGE>

proceedings declared by the USPTO that could result in substantial cost to 
the Company. Patent applications of others may 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 may 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. The Company or its 
collaborative partners may not prevail in any such action and any license 
(including licenses proposed by third parties) required under any such patent 
may not be made available on commercially acceptable terms, or 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. Litigation concerning patent and other 
intellectual property rights could consume a substantial portion of the 
Company's managerial and financial resources, which would have a material 
adverse effect on the Company's business, financial condition and results of 
operations.

POSSIBLE FUTURE CAPITAL REQUIREMENTS; UNCERTAINTY OF ADDITIONAL FUNDING

    The Company believes that its available cash, cash from operations and 
funds from existing credit arrangements will be sufficient to satisfy its 
funding needs for at least the next 24 months. Thereafter, if cash generated 
from operations is insufficient to satisfy the Company's working capital and 
capital expenditure requirements, the Company may be required to sell 
additional equity or debt securities or obtain additional credit facilities. 
Additional capital, if needed, may not be available on satisfactory terms, or 
at all.

    Furthermore, any additional equity financing may be dilutive to 
stockholders, and debt financing, if available, may include restrictive 
covenants. The Company's future liquidity and capital funding requirements 
will depend on numerous factors, including the extent to which the Company's 
new products and products under development are successfully developed, gain 
market acceptance and become and remain competitive, the timing and results 
of clinical studies and regulatory actions regarding the Company's potential 
products, the costs and timing of further expansion of sales, marketing and 
manufacturing activities, facilities expansion needs, and the costs and 
timing associated with the enforcement, defense and resolution of patent 
matters, including potential licensing of certain technologies patented by 
others. 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 "Management's Discussion 
and Analysis of Financial Condition and Results of Operations -- Liquidity 
and Capital Resources."

IMPACT OF YEAR 2000 ISSUE

    The Y2K Issue could have a material adverse impact on the operations of 
the Company. Additionally, the systems of other companies on which Biosite's 
systems rely may not be timely converted, which may have an adverse effect on 
the Company's systems. For example, to the extent that customers would be 
unable to order products or pay invoices or suppliers would be unable to 
manufacture or deliver product, the Company's operations would be adversely 
affected.

                                     -17-
<PAGE>

PART II.  OTHER INFORMATION.

ITEM 1.  LEGAL PROCEEDINGS

    In September 1997, Behring Diagnostics, Inc. and Behring Diagnostics, 
GmbH filed a patent infringement action against the Company in the U.S. 
District Court for the District of Delaware. The patent infringement action 
alleged that the Company's Triage DOA Panel products infringed a patent held 
by the plaintiffs, which expires in August 2000. The plaintiffs sought to 
recover damages of an unspecified amount and to enjoin future sales of the 
Triage DOA Panel products by the Company. Biosite answered the complaint, 
denying infringement and asserting affirmative defenses that the patent is 
invalid and unenforceable. Because of a merger, the identity of the 
plaintiffs changed to Dade Behring Inc., Dade Behring Marburg GmbH and Syva 
Company (collectively "Dade Behring"). To avoid protracted litigation and 
continued significant legal defense costs, the Company and Dade Behring 
executed a settlement agreement in March 1999 that resolved all disputes 
outstanding between the companies. Under the terms of the settlement 
agreement, the Company obtained a license to the patent and will provide Dade 
Behring the option to evaluate certain proprietary technology. The settlement 
resulted in a net payment of $1,050,000 to Dade Behring by Biosite.

    On April 28, 1998, Spectral Diagnostics, Inc. ("Spectral") filed a patent 
infringement action against the Company in the U.S. District Court for the 
Western District of Wisconsin, alleging that the Company's Triage Cardiac 
Panel infringed U.S. patent 5,744,358 which was issued on the date the suit 
was filed. Spectral sought a permanent injunction and damages. Spectral also 
sought a preliminary injunction that would enjoin the Company from selling 
the Triage Cardiac Panel. On July 16, 1998, the Court issued an opinion 
denying the motion for a preliminary injunction. Spectral also moved for 
partial summary judgment on the issue of infringement. That motion was denied 
on July 20, 1998. The established trial date of August 31, 1998 was set aside 
while the two companies engaged in negotiations in an attempt to arrive at a 
settlement in regards to all disputes outstanding between Biosite and 
Spectral. In February 1999, a settlement agreement was executed that resolved 
all disputes between the companies without a material adverse financial 
impact to Biosite.

ITEM 6.  EXHIBITS AND REPORTS ON FORM 8-K.

         (a)      Exhibits

                  27.1         Financial Data Schedule

         (b)      Reports on Form 8-K.

                  None


                                     -18-
<PAGE>

SIGNATURES

    Pursuant to the requirements of the Securities Exchange Act of 1934, the 
Registrant has duly caused this report to be signed on its behalf by the 
undersigned thereunto duly authorized.

    Dated:  May 11, 1999               BIOSITE DIAGNOSTICS INCORPORATED

                                       By:  /s/ CHRISTOPHER J. TWOMEY
                                            ----------------------------------
                                            Christopher J. Twomey
                                            Vice President, Finance and Chief 
                                              Financial Officer
                                              (Principal Financial and 
                                              Accounting Officer)


                                     -19-



<TABLE> <S> <C>

<PAGE>
<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
REGISTRANT'S FINANCIAL STATEMENTS AS OF AND FOR THE QUARTER ENDED MARCH 31, 1999
AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS
INCLUDED IN THE COMPANY'S 1998 ANNUAL REPORT ON FORM 10-K.
</LEGEND>
       
<S>                             <C>
<PERIOD-TYPE>                   3-MOS
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-START>                             JAN-01-1999
<PERIOD-END>                               MAR-31-1999
<CASH>                                           1,758
<SECURITIES>                                    30,060
<RECEIVABLES>                                    6,700
<ALLOWANCES>                                         0
<INVENTORY>                                      4,823
<CURRENT-ASSETS>                                46,643
<PP&E>                                          17,606
<DEPRECIATION>                                  10,545
<TOTAL-ASSETS>                                  65,015
<CURRENT-LIABILITIES>                            7,186
<BONDS>                                          3,921
                                0
                                          0
<COMMON>                                           130
<OTHER-SE>                                      53,778
<TOTAL-LIABILITY-AND-EQUITY>                    65,015
<SALES>                                          9,448
<TOTAL-REVENUES>                                 9,946
<CGS>                                            3,742
<TOTAL-COSTS>                                    7,990
<OTHER-EXPENSES>                                     0
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                   0
<INCOME-PRETAX>                                (1,786)
<INCOME-TAX>                                       729
<INCOME-CONTINUING>                            (1,057)
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                   (1,057)
<EPS-PRIMARY>                                   (0.08)<F1>
<EPS-DILUTED>                                   (0.08)
<FN>
<F1> EARNINGS PER SHARE IS CALCULATED ON THE BASIS DESCRIBED IN NOTE
2 OF NOTES TO FINANCIAL STATEMENTS.
</FN>
        

</TABLE>


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