BIOCIRCUITS CORP
S-3, 1997-01-15
IN VITRO & IN VIVO DIAGNOSTIC SUBSTANCES
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<PAGE>

      AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON JANUARY 15, 1997
                                                         REGISTRATION NO. 333- 
- -------------------------------------------------------------------------------
- -------------------------------------------------------------------------------

                          SECURITIES AND EXCHANGE COMMISSION
                                Washington, D.C. 20549

                                -----------------------
                                                         
                                       FORM S-3
                                REGISTRATION STATEMENT
                                        UNDER
                              THE SECURITIES ACT OF 1933

                                -----------------------
                                                          
                               BIOCIRCUITS CORPORATION
                (Exact name of Registrant as specified in its charter)


          DELAWARE                      --------                  94-3060271   
(State or other jurisdiction of (Primary Standard Industrial  (I.R.S. Employer 
incorporation or organization)  Classification Code Number)     Identification 
                                                                    Number)

                                -----------------------
                                                          
                               1324 CHESAPEAKE TERRACE
                             SUNNYVALE, CALIFORNIA 94089
                                    (408) 745-1961
           (Address, including zip code, and telephone number, including
              area code, of registrant's principal executive offices)
   
                                -----------------------

                                 DONALD B. HAWTHORNE
                                CHIEF FINANCIAL OFFICER
                                1324 CHESAPEAKE TERRACE
                              SUNNYVALE, CALIFORNIA 94089
                                     (408) 745-1961
           (Name, address, including zip code, and telephone number, 
                    including area code, of agent for service)

                                -----------------------

                                       COPIES TO:
                                          
                                DEBORAH A. MARSHALL, ESQ.
                                   COOLEY GODWARD LLP
                                 FIVE PALO ALTO SQUARE
                                  3000 EL CAMINO REAL
                                PALO ALTO, CA 94306-2155
                                     (415) 843-5000

                                -----------------------

          APPROXIMATE DATE OF COMMENCEMENT OF PROPOSED SALE TO THE PUBLIC:
    As soon as practicable after this Registration Statement becomes effective.

                                -----------------------

    If the only securities being registered on this Form are being offered 
pursuant to dividend or interest reinvestment plans, please check the 
following box. / /

    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, other than securities offered only in connection with dividend 
or interest reinvestment plans, check the following box. /X/

    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 filed in 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 of 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>
- -----------------------------------------------------------------------------------------------------------------------
- -----------------------------------------------------------------------------------------------------------------------
  TITLE OF EACH CLASS OF       AMOUNT TO BE   PROPOSED MAXIMUM OFFERING    PROPOSED MAXIMUM AGGREGATE      AMOUNT OF
SECURITIES TO BE REGISTERED     REGISTERED       PRICE PER SHARE (1)            OFFERING PRICE (1)     REGISTRATION FEE
- -----------------------------------------------------------------------------------------------------------------------
<S>                            <C>            <C>                          <C>                         <C>
Common Stock                     1,588,677          $3.25                       $5,163,200.25             $1,564.61
- -----------------------------------------------------------------------------------------------------------------------
- -----------------------------------------------------------------------------------------------------------------------
</TABLE>

(1) Estimated in accordance with Rule 457(c) solely for the purpose of 
computing the amount of the registration fee based on the average of the 
high and low prices of the Company's Common Stock as reported on the Nasdaq 
National Market System on January 10, 1997.

                                -----------------------
                                                         
   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 THAT 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>

                               BIOCIRCUITS CORPORATION

                                CROSS REFERENCE SHEET

                     PURSUANT TO ITEM 501(b) OF REGULATION S-K
                   SHOWING LOCATION IN PROSPECTUS OF INFORMATION
                            REQUIRED BY ITEMS OF FORM S-3

Cross Reference Sheet showing the location in the Prospectus of the Items on 
Form S-3



     FORM S-3 ITEM AND CAPTION                    LOCATION IN PROSPECTUS
     -------------------------                -----------------------------
1.   Forepart of Registration Statement 
      and Outside Cover Page of Prospectus. . Outside Front Cover Page

2.   Inside Front and Outside Back Cover
      Pages of Prospectus . . . . . . . . . . Inside Front and Outside Back 
                                               Cover

3.   Summary Information, Risk Factors and 
      Ratio of Earnings to Fixed Charges. . . The Company; Risk Factors

4.   Use of Proceeds. . . . . . . . . . . . . Use of Proceeds

5.   Determination of Offering Price. . . . . *

6.   Dilution . . . . . . . . . . . . . . . . *

7.   Selling Security Holders . . . . . . . . Selling Securityholders

8.   Plan of Distribution . . . . . . . . . . Outside Front Cover Page; Plan
                                               of Distribution

9.   Description of Securities to Be 
      Registered. . . . . . . . . . . . . . . *

10.  Interests of Named Experts and Counsel . *

11.  Material Changes . . . . . . . . . . . . *

12.  Incorporation of Certain Information
      by Reference. . . . . . . . . . . . . . Inside Front Cover

13.  Disclosure of Commission Position 
      on Indemnification for Securities 
      Act Liabilities . . . . . . . . . . . . *

- -----------------
*   Such item is inapplicable or the answer thereto is in the negative.

<PAGE>

                                     PROSPECTUS

                                  1,588,677 SHARES

                              BIOCIRCUITS CORPORATION
                                          
                                ___________________
                                          
                                    COMMON STOCK
                                ___________________

     This Prospectus relates to a total of 1,588,677 shares of Common Stock 
(the "Shares"), with a par value of $0.001 (the "Common Stock") of 
Biocircuits Corporation (the "Company") which are being offered and sold by 
certain stockholders of the Company (the "Selling Securityholders").  Of such 
Shares (i) 1,111,727 were issued by the Company in connection with the 
conversion of a secured promissory note (the "Note") into Common Stock of the 
Company on December 13, 1996 (the "Conversion"), (ii) 222,345 are issuable 
pursuant to the exercise of a warrant which was issued in connection with the 
Conversion (the "Beckman Warrant"), (iii) 250,000 are issuable pursuant to 
the exercise of a warrant which was issued in connection with a manufacturing 
arrangement (the "Kollsman Warrant") and (iv) 4,605 are issuable pursuant to 
the exercise of a warrant issued in connection with a standby letter of 
credit issued on August 6, 1996 (the "Credit Warrant"). The Beckman Warrant, 
the Kollsman Warrant and the Credit Warrant are referred to herein 
collectively as the "Warrants".

     The Shares may be offered by the Selling Securityholders from time to 
time in transactions on the Nasdaq National Market System, in privately 
negotiated transactions or a combination of such methods of sale, at fixed 
prices that may be changed, at market prices prevailing at the time of sale, 
at prices related to such prevailing market prices or at negotiated prices.  
The Selling Securityholders may effect such transactions by selling the 
Shares to or through broker-dealers, and such broker-dealers may receive 
compensation in the form of discounts, concessions or commissions from the 
Selling Securityholders or the purchasers of the Shares for whom such  
broker-dealers may act as agent or to whom they sell as principal or both 
(which compensation to a particular broker-dealer might be in excess of 
customary commissions).  See "Selling Securityholders" and "Plan of 
Distribution."

     The Company will not receive any of the proceeds from the sale of the 
Shares by the Selling Securityholders hereof.  See "Plan of Distribution."

     The Selling Securityholders, directly or through agents, dealers or 
underwriters, may sell the Shares offered hereby from time to time on terms 
to be determined at the time of sale.  The Company's Common Stock is traded 
on the Nasdaq National Market System under the symbol BIOC.  The last 
reported sales price on the Company's Common Stock on the Nasdaq National 
Market on January 13, 1996 was $3.31 per share.
                             ____________________

              THE SHARES OFFERED HEREBY INVOLVE A HIGH DEGREE OF RISK.
                           SEE "RISK FACTORS" ON PAGE 7.
                             _____________________

  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.

     No underwriting commissions or discounts will be paid by the Company in 
connection with this offering.  Estimated expenses payable by the Company in 
connection with this offering are $21,565.00.  The aggregate proceeds to 
the Selling Securityholders from the sale of the Shares will be the purchase 
price of the Shares sold less the aggregate agents' commissions and 
underwriters' discounts, if any, and other expenses of issuance and 
distribution not borne by the Company.  See "Plan of Distribution."

     The Selling Securityholders and any broker-dealers, agents or 
underwriters that participate with the Selling Securityholders in the 
distribution of the Shares may be deemed to be "underwriters" within the 
meaning of the Securities Act of 1933, as amended (the "Act"), and any 
commission received by them and any profit on the resale of the Shares 
purchased by them may be deemed to be underwriting commissions or discounts 
under the Act.  The Company has agreed to indemnify the Selling 
Securityholders and certain other persons against certain liabilities, 
including liabilities under the Act.

        The date of this Prospectus is January 15, 1997.

<PAGE>

    No person is authorized in connection with any offering made hereby to 
give any information or to make any representation not contained or 
incorporated by reference in this Prospectus, and any information or 
representation not contained or incorporated herein must not be relied upon 
as having been authorized by the Company. This Prospectus does not constitute 
an offer to sell, or a solicitation of an offer to buy, by any person in any 
jurisdiction in which it is unlawful for such person to make such offer or 
solicitation. Neither the delivery of this Prospectus at any time nor any 
sale made hereunder shall, under any circumstances, imply that the 
information herein is correct as of any date subsequent to the date hereof.

                       AVAILABLE INFORMATION

    The Company is subject to the informational reporting requirements of the 
Securities Exchange Act of 1934, as amended (the "Exchange Act"), and in 
accordance therewith, files reports, proxy statements and other information 
with the Securities and Exchange Commission (the "Commission"). Such reports, 
proxy statements and other information can be inspected and copied at the 
public reference facilities maintained by the Commission at Room 1024, 450 
Fifth Street, N.W., Judiciary Plaza, Washington, D.C. 20549, and at the 
Commission's following Regional Offices: Chicago Regional Office, Citicorp 
Center, 500 West Madison Street, Suite 1400, Chicago, Illinois 60661-2511; 
and New York Regional Office, 7 World Trade Center, Suite 1300, New York, New 
York 10048. Copies of such material can be obtained at prescribed rates from 
the Public Reference Section of the Commission at 450 Fifth Street, N.W., 
Judiciary Plaza, Washington, D.C. 20549. The Commission maintains a Web site 
that contains reports, proxy and information statements and other information 
regarding registrants that file electronically with the Commission. The 
address of such Web site is http://www.sec.gov. The Company's Common Stock is 
quoted on the Nasdaq National Market System, and such reports, proxy 
statements and other information can also be inspected at the offices of The 
Nasdaq Operations, 1735 K Street, N.W., Washington, D.C. 20006.

    Additional information regarding the Company and the Shares offered 
hereby is contained in the Registration Statement on Form S-3 and the 
exhibits thereto filed with the Commission under the Securities Act of 1933, 
as amended (the "Securities Act"). This Prospectus does not contain all of 
the information contained in such Registration Statement and the exhibits 
thereto. Statements contained in this Prospectus regarding the contents of 
any document or contract may be incomplete and, in each instance, reference 
is made to the copy of such contract or document filed as an exhibit to the 
Registration Statement. For further information pertaining to the Company and 
the Shares, reference is made to the Registration Statement and the exhibits 
thereto, which may be inspected without charge at, and copies thereof may be 
obtained at prescribed rates from, the office of the Commission at 450 Fifth 
Street, N.W., Judiciary Plaza, Washington, D.C. 20549.

          INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE

    The following documents filed by the Company with the Commission pursuant 
to the Exchange Act are by this reference incorporated in and made a part of 
this Prospectus:

(1) The Annual Report on Form 10-K for the fiscal year ended December 31, 1995 
    filed on March 31, 1996, including all matters incorporated by reference 
    therein;

(2) The Proxy Statement filed on April 18, 1996, including all matters 
    incorporated by reference therein;

(3) The Quarterly Report on Form 10-Q for the quarterly period ended March 31, 
    1996, filed on May 14, 1996, including all matters incorporated by 
    reference therein;

(4) The Quarterly Report on Form 10-Q for the quarterly period ended June 30, 
    1996, filed on August 13, 1996, including all matters incorporated by 
    reference therein; and

(5) The Quarterly Report on Form 10-Q for the quarterly period ended 
    September 30, 1996, filed on November 14, 1996, including all matters 
    incorporated by reference therein.


                                         3.


<PAGE>

    All documents filed by the Company pursuant to Section 13(a), 13(c), 14 
or 15(d) of the Exchange Act after the date of this Prospectus and prior to 
the termination of the offering shall be deemed to be incorporated by 
reference herein and to be a part of this Prospectus from the date of filing 
of such documents. Any statement contained in a document incorporated or 
deemed to be incorporated by reference herein shall be deemed to be modified 
or superseded for purposes of this Prospectus to the extent that a statement 
contained herein or in any other subsequently filed document which also is or 
is deemed to be incorporated by reference herein modifies or supersedes such 
statement. Any such statement so modified or superseded shall not be deemed, 
except as so modified or superseded, to constitute a part of this Prospectus.

    Copies of all documents which are incorporated herein by reference (not 
including the exhibits to such documents, unless such exhibits are 
specifically incorporated by reference into such documents or into this 
Prospectus) will be provided without charge to each person, including any 
beneficial owner to whom this Prospectus is delivered, upon a written or oral 
request to Biocircuits Corporation, Attention:  Donald Hawthorne, 1324 
Chesapeake Terrace, Sunnyvale, California, 94089, telephone number (408) 
745-1961.

                           ____________________



                                     4.

<PAGE>

                              THE COMPANY

    THE FOLLOWING SUMMARY IS QUALIFIED IN ITS ENTIRETY BY THE MORE DETAILED 
INFORMATION AND FINANCIAL STATEMENTS INCORPORATED BY REFERENCE IN THIS 
PROSPECTUS

    Biocircuits was founded in 1989 to develop new immunodiagnostic testing 
systems. Immunodiagnostic tests, or "assays," are performed on samples of 
bodily fluids to diagnose a variety of infectious diseases and other 
conditions such as endocrine dysfunctions, and to conduct therapeutic drug 
monitoring. Immunodiagnostic tests utilize biological reagents, such as 
antibodies, and an instrument to detect the presence of a substance of 
interest, or "analyte," such as a virus or hormone.

    The Company's IOS point-of-care immunodiagnostic testing system consists 
of a compact, inexpensive instrument and disposable test cartridges that can 
be operated by a user with no special skills or training. The system enables 
users to perform tests at many locations, including physicians' offices, 
ambulatory clinics and small clinical laboratories. In the first quarter of 
1996, the Company began marketing its IOS system with cartridges capable of 
performing T4 and T Uptake tests, two of the most commonly requested 
immunodiagnostic tests for assessing thyroid function.  In September 
1996, the Company announced clearance from the United States Food and Drug 
Administration (the "FDA") to market a qualitative serum pregnancy assay, a 
test designed to allow physicians to perform this common pregnancy test in 
their offices during the patient visit where they can provide more immediate 
pre-natal care to patients.  In December 1996, the Company announced FDA 
clearance to market a quantitative hCG assay, a test to track the progress of 
early pregnancies.  Also in December 1996, the Company launched its Thyroid 
Stimulating Hormone ("TSH") assay on a second generation cartridge. The TSH 
assay is a test to assess thyroid function. The second generation cartridge 
will be required for the market launch of all new assays.  In addition, 
existing assays will be converted to the new cartridge in the near future.

    Biocircuits is currently developing three additional assays: a prostate 
specific antigen ("PSA") test for management of prostate cancer patients, a 
Digoxin test for monitoring the therapeutic usage of this drug in the 
treatment of heart disease and a Free T4 test for diagnosing true clinical 
thyroid status. The Company plans to continue to develop additional 
immunodiagnostic assays commonly requested by office-based physicians.

    The Company believes that its IOS system is the first low-cost, 
commercially available product which permits a physician to perform 
immunodiagnostic tests at the point of patient care.  Performing tests with 
current immunodiagnostic testing systems is time consuming, expensive and 
requires multiple steps and skilled technicians.  The Company believes that 
the IOS system reduces the cost of immunodiagnostic testing by providing test 
results more rapidly than other current testing procedures.

    Biocircuits is targeting the approximately 41,000 small- to medium-sized 
physician office practices and free-standing alternate site laboratories 
which are licensed under the Clinical Laboratories Improvement Act of 1967 
and Amendments of 1988 ("CLIA") for high or moderate complexity testing.  
Most of these sites do not currently have an immunodiagnostic testing 
capability.  The IOS system is approved for moderately complex testing.

    To perform a test, the operator inserts the test cartridge into the IOS 
instrument, which then reads the relevant assay information contained on the 
cartridge's bar code.  The cartridge is then partially released from the 
instrument, enabling the operator to place the specimen (blood, urine or 
other samples) into one to two wells in the cartridge, depending on the test. 
The sample automatically flows to the test zone, where it produces a signal 
that the instrument uses to determine the test results.  The IOS instrument 
provides a liquid crystal display and a printed output in approximately 20 to 
35 minutes, although the time varies by test. Receiving results within this 
time frame enables the doctor to make a treatment decision before the patient 
leaves the office, facilitating earlier treatment and obviating the need for 
an additional visit or telephone call.

    Biocircuits has developed significant knowledge about lipid/polymer 
biomaterials in the past seven years that the Company believes could be 
useful in other diagnostic system applications. In August 1995, Biocircuits 
entered into an agreement with Beckman Instruments, Inc. ("Beckman") and 
received $3,500,000 in the form of the Note in exchange for granting Beckman 
options for licensing and marketing rights to certain testing applications 
using the Company's lipid-polymer technology.  Pursuant to the terms of the 
agreement, Biocircuits completed a feasibility study in August 1996.  Because 
Beckman subsequently elected not to exercise its development license option, 
Biocircuits regained full rights to the lipid-polymer technology, including 
all improvements made during the feasibility study. In connection with the 
Conversion, Beckman elected to convert the Note into the Company's 
Common Stock and the Beckman Warrant. Biocircuits will continue its internal 
efforts to develop further the lipid-polymer technology and will also look 
for licensing partners.  The Company believes the lipid-polymer technology 
could be used in a next generation IOS system.

                                     5.

<PAGE>

                            THE OFFERING 

Shares offered  . . . . . . . . . . .  Up to 1,588,677 Shares, all of which 
                                       are being offered by the Selling 
                                       Securityholders.(1)
 
Use of Proceeds . . . . . . . . . . .  The Company will not receive any of 
                                       the proceeds from the sale of the 
                                       Shares by the Selling Securityholders. 
                                       The net proceeds from the exercise of 
                                       the Warrants received by the Company 
                                       will be considered uncommitted funds 
                                       that may be used by the Company for 
                                       general corporate purposes, including 
                                       sales and marketing and research and 
                                       development.

Nasdaq Symbol   . . . . . . . . . . .  BIOC.


(1) (i) 1,111,727 were issued by the Company in connection with the 
    Conversion, (ii) 222,345 are issuable pursuant to the exercise of the 
    Beckman Warrant, (iii) 250,000 are issuable pursuant to the exercise 
    of the Kollsman Warrant and (iv) 4,605 are issuable pursuant to the 
    Credit Warrant.  Assumes the exercise of all of the Warrants.
 
Biocircuits Corporation and IOS are registered trademarks of the Company.


                                        6.


<PAGE>


                           RISK FACTORS

     THE FOLLOWING FACTORS SHOULD BE CONSIDERED CAREFULLY WITH THE
INFORMATION PROVIDED ELSEWHERE IN THIS PROSPECTUS IN EVALUATING AN
INVESTMENT IN THE SHARES OFFERED HEREBY.  

       THIS PROSPECTUS CONTAINS FORWARD-LOOKING STATEMENTS WHICH
INVOLVE RISKS AND UNCERTAINTIES.  THE COMPANY'S ACTUAL RESULTS COULD
DIFFER MATERIALLY FROM THOSE ANTICIPATED IN THESE FORWARD-LOOKING
STATEMENTS AS A RESULT OF CERTAIN FACTORS, INCLUDING THOSE SET FORTH IN
THE FOLLOWING RISK FACTORS AND ELSEWHERE IN THIS PROSPECTUS.

DEVELOPMENT STAGE COMPANY; PRODUCTS UNDER DEVELOPMENT.

       Biocircuits was founded in 1989 and is a development stage company.  To 
achieve profitable operations, the Company, alone or with others, must, among 
other things, successfully develop, obtain regulatory approval for, introduce 
and market its current and potential products.  The time frame necessary to 
develop the Company's diagnostic instruments and tests is uncertain.  The 
Company has experienced delays in the scheduled completion of its IOS 
point-of-care instrument and test cartridges, and there can be no assurance 
that further product development delays will not occur in the future. 

       The Company's first sale and shipment of its IOS system, with 
cartridges capable of performing two of the most commonly requested 
immunodiagnostic tests, T4 and T Uptake, occurred in March 1996.  In 
September 1996, the Company received FDA clearance to market a qualitative 
serum pregnancy assay. The Company received clearances from the FDA for a TSH 
assay in November 1996 and a quantitative hCG assay in December 1996.  
Biocircuits is currently developing three additional assays: a PSA test, a 
Digoxin test, and a Free T4 test.  In December 1996, the Company launched its 
TSH assay on a second generation cartridge.  The second generation cartridge 
will be required for the market launch of all new assays.  In addition, 
existing assays will be converted to the new cartridge in the near future.  
The Company does not expect to realize any significant revenue from related 
instrument sales until at least the second quarter of 1997.

       There can be no assurance that the IOS point-of-care system and tests 
will perform in accordance with the Company's specifications, that the 
Company will be able to develop successfully or obtain regulatory clearance 
for additional tests or any other future products, that the second generation 
cartridge will perform as planned, that any of the Company's products can be 
manufactured in sufficient quantity, at acceptable cost and with appropriate 
quality, or that any products, if and when approved, can be successfully 
marketed.  Failure to meet one or more of these challenges could have a 
material adverse effect on the Company.

UNCERTAIN MARKET ACCEPTANCE OF POINT-OF-CARE PRODUCT

      Substantially all immunodiagnostic testing currently is performed at 
large clinical laboratories rather than the point-of-care site.  There can be 
no assurance that the Company will be successful in developing and 
penetrating the point-of-care market for immunodiagnostic testing.  In order 
to be successful, the Company must expand its existing sales force of 6 sales 
representatives to between 12 and 20 sales representatives and further 
develop its relationships with distributors which currently supply a 
substantial portion of medical and test products to physicians. The selling 
process typically requires the Company's sales force to work closely with 
distributors, generate qualified physician leads and perform demonstrations 
for the IOS system in physicians' offices.  The selling process can be 
time-consuming and there can be no assurance that the Company will be 
successful in marketing the IOS system, that the rate of sales growth will 
meet expectations or that the marketing programs of the Company will achieve 
the desired results.  To date, the number of instrument sales to distributors 
and placements in physicians' offices have been significantly less than the 
Company's initial expectations.

                                        7.

<PAGE>


       In general, market acceptance of the Company's initial point-of-care 
system will depend upon the Company's ability to demonstrate the accuracy and 
value of its system and to persuade physicians to perform the Company's 
initial tests in their own facilities rather than send those tests to 
clinical laboratories.  More specifically, in order for the Company to have 
success in penetrating the point-of-care immunodiagnostic market and to 
achieve significant sales of IOS systems and test cartridges, the Company 
believes it will need to expand its menu of tests beyond the T4 and T Uptake 
tests.  The Company believes that a TSH test may be a key element in 
penetrating the physicians' office market.  There can be no assurance that 
the TSH test will have the desired impact in increasing the market acceptance 
of the Company's IOS system.

LACK OF MARKETING EXPERIENCE; INTERNATIONAL SALES

       The Company plans to target the estimated 41,000 physician practices 
and alternate site laboratories that are licensed under the Clinical 
Laboratories Improvement Act of 1967 and Amendments of 1988 (CLIA) for high 
or moderate complexity testing, most of which currently do not have an 
immunodiagnostic testing capability.  The Company plans to market its IOS 
point-of-care system to physicians' offices and alternative site laboratories 
through distributors supported by its own sales force in the United States 
and through distributors and marketing partners outside the United States.  
The Company has entered into agreements with medical supply distributors with 
distribution sites throughout the United States and sales representatives 
with expertise in selling testing and other medical equipment to the 
physicians' office laboratory market. Although the Company's first sale and 
shipment of its IOS system occurred in March 1996, there can be no assurance 
that the Company will be successful in marketing its products, directly or 
through distributors.  In addition, since the Company first established 
relationships with its distributors, some of the distributors of the 
Company's products have consolidated with companies that distribute products 
that may compete with the Company's products.  There can be no assurance that 
such consolidation will not continue, and if it does continue, that such 
consolidation will not have an adverse impact on the Company's operations.  

       In addition to its relationships with distributors, the Company must 
expand its marketing and customer service programs and its sales force in 
order to penetrate successfully the point-of-care market for immunodiagnostic 
testing.  In order to compete successfully, the Company will be required to 
provide prompt service to its customers.  However, there can be no assurance 
that the Company will be able to establish the necessary programs or that 
such programs and service will be consistently reliable.  

       The Company expects that international sales will represent a portion 
of its net sales and that the Company's success will be dependent upon, among 
other things, its ability to form relationships with established 
international marketing partners.  To date, no such relationships have been 
established.  If such relationships are established, the Company will be 
subject to normal risks of international sales, such as currency 
fluctuations, export controls and other regulations.  In addition, the laws 
of certain foreign countries may not protect the Company's intellectual 
property rights to the same extent as do the laws of the United States.

RELATIONSHIP WITH BECKMAN AND OTHER POTENTIAL LICENSEES

       Biocircuits has developed significant knowledge about lipid/polymer 
biomaterials in the past seven years that the Company believes could be 
useful in other diagnostic system applications. In August 1995, Biocircuits 
entered into an agreement with Beckman Instruments, Inc. ("Beckman") and 
received $3,500,000 in the form of the Note in exchange for granting Beckman 
options for licensing and marketing rights to certain testing applications 
using the Company's lipid-polymer technology.  Pursuant to the terms of the 
agreement, Biocircuits completed a feasibility study in August 1996.  Because 
Beckman subsequently elected not to exercise its development license option, 
Biocircuits regained full rights to the lipid-polymer technology, including 
all improvements made during the feasibility study.  In connection with the 
Conversion, Beckman also elected to convert the Note into the Company's 
Common Stock and the Beckman Warrant to purchase the Company's Common Stock.

       Biocircuits will continue its internal efforts to develop further the 
lipid-polymer technology and will also look for licensing partners.  The 
Company believes the lipid-polymer technology could be used in a next 
generation IOS system.  There can be no assurance, however, that the Company 
will be able to enter into any licensing 

                                        8.

<PAGE>


partnerships, that any such partnerships would be successful, or that the 
lipid-polymer technology can be developed successfully for use in future 
products.

LACK OF MANUFACTURING EXPERIENCE; RELIANCE ON CONTRACT MANUFACTURERS

       Biocircuits has developed a proprietary manufacturing process for 
producing the test cartridges for its IOS point-of-care system.  The Company 
has established its initial manufacturing capability for the single-use 
cartridges. Various plastic components and other materials for the cartridges 
are and will be obtained from contract manufacturers.  The Company's near 
term cartridge manufacturing milestones include improving manufacturing 
efficiencies, expanding mold and cartridge manufacturing capacity as both the 
test menu and test manufacturing volume expand, initiating manufacturing 
automation efforts and manufacturing the cartridge at the Company's targeted 
cost.  There can be no assurance that the Company will be successful in 
achieving these milestones or that these milestones will be achieved on a 
timely basis.  This automation effort will be critical to meeting the 
Company's longer-term cartridge manufacturing demands and cost targets.  The 
cartridge manufacturing scale-up process will require the Company to develop 
advanced manufacturing techniques and rigorous process controls.  There can 
be no assurance that the Company will be successful in these efforts or that 
such efforts will result in the Company meeting expected cartridge demand or 
achieving the Company's longer-term cartridge manufacturing cost targets.  

       The Company has registered its manufacturing facility with the FDA and 
with the Department of Health Services of the State of California, and will 
be subject to state and federal inspections confirming the Company's 
compliance with good manufacturing practice ("GMP") guidelines.  Prior to the 
first sale and shipment of its IOS point-of-care system in March 1996, the 
Company believes it completed setting up this initial manufacturing capability
in compliance with GMP requirements.  No assurance can be given as to the 
ability of the Company to produce commercial quantities of cartridges in 
compliance with applicable regulations at an acceptable cost.  

       In August and December 1995, the Company entered into agreements with 
NalgeNunc International, Inc. ("Nunc") to manufacture the plastic components 
of its disposable test cartridges. Under the terms of the agreement, Nunc has 
the exclusive right to supply the plastic components for the test cartridges 
for all sales in North America.  The Company will be entirely dependent on 
Nunc as the sole source for the plastic components and the molding thereof.  
There can be no assurance that Nunc will be able to deliver the required 
quantities of test cartridge components on schedule or at costs acceptable to 
the Company.

       In December 1992, the Company entered into an agreement with KMC 
Systems, Inc. ("Kollsman") pursuant to which Kollsman was appointed the 
exclusive North American supplier of the IOS instrument.  The agreement with 
Kollsman contained certain minimum purchase requirements and expired three 
years from the date of first commercial production, subject to certain rights 
of earlier termination.  In April 1996, the Company and Kollsman executed a 
letter agreement to amend the 1992 agreement (the "Letter Agreement"), 
pursuant to which Kollsman will be the exclusive supplier of the IOS 
instrument through 1997, the minimum purchase requirements were eliminated 
and the Company and Kollsman agreed to an acceptable fixed transfer price to 
be paid through 1997, the revised term of the agreement.  Also pursuant to 
the Letter Agreement, the Company agreed to issue Kollsman a warrant to 
purchase 250,000 shares of Common Stock at an exercise price of $7.00 per 
share, subject to an increase of 50,000 shares under certain circumstances.  
The warrant was to expire at year end 1997, subject to certain extension 
rights.  In November 1996, the Company and Kollsman amended the Letter 
Agreement to extend the expiration date of the warrant to June 1998, subject 
to certain extension rights.  In order to secure an adequate supply of IOS 
instruments, the Company has established a standby letter of credit for the 
benefit of Kollsman.  The Company is entirely dependent on Kollsman as the 
sole source of production of its IOS instruments.  Kollsman, in turn, relies 
upon sole-source suppliers for certain components.  Failure of Kollsman's 
suppliers to deliver the required quantities on a timely basis and at 
commercially reasonable prices, or Kollsman's failure to deliver the IOS 
instruments to the Company on a timely basis or at commercially reasonable 
costs could materially adversely affect the Company.  

                                        9.

<PAGE>


       The Company has experienced delays from Kollsman in the past, 
resulting in delays in the development of the TSH, qualitative serum 
pregnancy and quantitative hCG assays and delays in the introduction of the 
IOS system and initial assays.  There can be no assurance that similar delays 
will not be encountered in the future.  In the event that shipments are 
delayed and orders for the IOS point-of-care system become significantly 
backlogged, the delay could have a material adverse impact on the Company.

HISTORY OF LOSSES; EXPECTATION OF FUTURE LOSSES

       At September 30, 1996, the Company's accumulated deficit was 
approximately $48.0 million. Biocircuits expects to incur additional losses 
over the next several years.  The Company expects that currently available 
funds will be used primarily for the continued launch of the IOS 
point-of-care system and development of additional tests for the IOS 
point-of-care system.  The losses may vary from period to period, including 
from quarter to quarter, and are generally expected to increase, due to the 
recent launch of the Company's IOS point-of-care system.  Accordingly, the 
Company believes that quarter-to-quarter results are not a useful indicator 
of the Company's performance.  There can be no assurance that any products 
will be manufactured or marketed successfully, or that profitability will 
ever be achieved.

FUTURE CAPITAL NEEDS; UNCERTAINTY OF ADDITIONAL FUNDING; MAINTENANCE OF 
NASDAQ LISTING

       Additional funds will be required in 1997 to carry the Company beyond 
the initial sales of the IOS system and to enable the Company to develop and 
obtain regulatory approval for additional tests.  The Company believes that 
its existing capital resources will be adequate to satisfy its requirements 
into the second quarter of 1997, assuming no exercise of outstanding 
warrants.  If the remaining warrants issued by the Company in June 1995, 
which expire on February 14, 1997, are exercised in full for cash, the 
Company would receive an aggregate amount of $2.1 million, which the Company 
estimates would satisfy the Company's cash requirements until late second 
quarter 1997. If the warrants issued by the Company in an October 1996 
private financing (the "Financing Warrants") are exercised prior to the end 
of second quarter 1997, the Company believes its cash resources will be 
adequate to satisfy its requirements through late in the third quarter of 
1997.  However, since the Financing Warrants expire in October 1997, there 
can be no assurance that they will be exercised prior to the end of second 
quarter 1997.  The Company has the right to call the Financing Warrants in 
the second half of their one year life if the Common Stock price equals or 
exceeds $5.25 per share. The Company's ability to continue its planned 
operations will be dependent upon its ability to obtain additional funds from 
existing investors, new investors or corporate partners.  The Company intends 
to pursue all of these financing options, but there can be no assurance that 
the Company will be successful.  If not successful in obtaining financing, 
the Company's business will be materially and adversely affected.

       The Company believes that maintaining its listing on the Nasdaq 
National Market System ("Nasdaq") is central to its ability to raise 
additional funds as well as to provide liquidity to investors. The Company 
believes that the Conversion of the Note will result in the Company 
meeting Nasdaq listing requirements until the end of first quarter 1997.  If 
approximately one-third of the warrants which expire in February 1997 are 
exercised for cash, the Company believes it will meet Nasdaq listing 
requirements until the end of second quarter 1997.  If the Financing Warrants 
are exercised before June 30, 1997, the Company believes it will meet Nasdaq 
listing requirements until the end of third quarter 1997.  Thereafter, the 
Company will be required to generate sufficient revenues or raise additional 
capital to maintain Nasdaq listing requirements.  

       The Company expects its cash requirements to increase significantly in 
future periods due to higher expenses.  The Company expects to incur 
substantial additional costs, including costs related to ongoing research and 
development activities, either alone or in collaboration with strategic 
partners, clinical trials, expansion of manufacturing, research and 
development and administrative facilities, development of manufacturing 
capabilities, obtaining regulatory approvals and establishing sales, 
marketing and distribution capabilities.  The Company's long-term capital 
requirements will depend on numerous factors, including the progress of the 
Company's research and product development, the timing and cost of obtaining 
regulatory approvals, the costs associated with patents and other 
intellectual property rights, the levels of resources devoted to the 
development of manufacturing and 

                                       10.

<PAGE>

marketing capabilities and potential collaborative partnerships.  The Company 
intends to seek additional funding through collaborative relationships and 
public or private financings.  Other methods of financing the acquisition of 
capital equipment, including lease financing, may be utilized if available on 
attractive terms.  Raising additional funds from public or private financings 
may result in further dilution to then-existing shareholders.  The Company 
also may attempt to obtain funds through arrangements with strategic partners 
or others that may require the Company to relinquish rights to certain of its 
technologies, products or marketing territories in exchange for funding.  If 
adequate funds are not available from these sources, the Company will be 
required to curtail its operations significantly.  No assurance can be given 
that any additional financing will be available, or, if available, that it 
will be available on acceptable terms.

COMPETITION

       Human immunodiagnostics is an intensely competitive field in which 
there are a number of well-established companies. Many of the Company's 
competitors have substantially greater financial resources and larger, more 
established sales, marketing, and service organizations. The primary bases of 
competition in the immunodiagnostic testing market are throughput, 
ease-of-use, price, breadth of test menu, quality of results and service. 
There can be no assurance that the Company will be able to compete 
successfully on any of these bases.  

       The Company believes that its principal competitors will be large 
companies with a diagnostic division such as Abbott Laboratories, Becton, 
Dickinson and Company, Boehringer Mannheim, GmbH, Chiron/Ciba-Corning 
Diagnostics Corporation and Johnson & Johnson. Each of these companies has an 
established position in the clinical laboratory test market with systems 
based on traditional immunoassay technology. No assurance can be given that 
the Company's products will compete successfully with existing or future 
products of such competitors or that new competitors will not enter the 
market with competing technologies. The Company expects that in the future, 
one or more of these companies or others will develop and introduce new 
systems for the point-of-care market. If any such company is able to develop 
or acquire rights to a better immunodiagnostic testing system, the Company's 
business would be materially adversely affected.

UNCERTAINTY OF PROTECTION OF PATENTS AND PROPRIETARY TECHNOLOGY

       The Company has aggressively pursued the development of a patent 
portfolio to protect its technology.  However, the patent positions of any 
medical device manufacturer, including Biocircuits, are uncertain and involve 
complex legal and factual questions for which important legal principles are 
largely unresolved. In addition, the coverage claimed in a patent application 
can be significantly reduced before a patent is issued. Consequently, there 
can be no assurance that any patent applications will result in the issuance 
of patents or, with respect to issued patents, whether they will provide 
significant proprietary protection or will be circumvented or invalidated. 
Since patent applications in the United States are maintained in secrecy 
until patents issue, and since publication of discoveries in the scientific 
or patent literature often lag behind actual discoveries, the Company cannot 
be certain that it or any licensor was the first to file a patent application 
for such invention. Moreover, the Company might have to participate in 
interference proceedings declared by the United States Patent and Trademark 
Office to eventually determine priority of invention, which could result in 
substantial costs to the Company, even if the patents, if issued, would be 
held valid by a court or if a competitor's technology or product would be 
found to infringe such patents.  

       The Company also relies upon trade secret protection for its 
confidential and proprietary information. 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 trade secrets.

       Biocircuits requires its employees, consultants and advisors to 
execute confidentiality agreements upon the commencement of an employment or 
consulting relationship with the Company. Each agreement provides that all 
confidential information developed or made known to the individual during the 
course of the relationship will be kept confidential and not disclosed to 
third parties except in specified circumstances. In the case of employees, 
the 

                                       11.


<PAGE>


agreements provide that all inventions conceived by an individual shall be 
the exclusive property of the Company, other than inventions unrelated to the 
Company's business and developed entirely on the employee's own time. There 
can be no assurance, however, that these agreements will provide meaningful 
protection or adequate remedies for the Company's trade secrets in the event 
of unauthorized use or disclosure of such information.

GOVERNMENT REGULATION

       The Biocircuits IOS point-of-care system is regulated in the United 
States as a medical device by the FDA and as such, requires regulatory 
clearance or approval prior to commercialization. Pursuant to the Federal 
Food, Drug and Cosmetic Act (the "FDC Act"), and the regulations promulgated 
thereunder, the FDA regulates, among other things, the clinical testing, 
manufacture, labeling, promotion, distribution, sale and use of medical 
devices in the United States. Failure of the Company to comply with 
applicable regulatory requirements can result in, among other things, warning 
letters, fines, injunctions, civil penalties, recall or seizure of products, 
total or partial suspension of production, the government's refusal to grant 
premarket clearance or premarket approval of devices, withdrawal of marketing 
approvals, and criminal prosecution.  

       In the United States, medical devices are classified into one of three 
classes, Class I, II or III, based on the controls necessary to reasonably 
ensure their safety and effectiveness. Class I devices are those devices 
whose safety and effectiveness can reasonably be ensured through general 
controls, such as adequate labeling, pre-market notification, and adherence 
to GMP regulations. Class II devices are those devices whose safety and 
effectiveness can reasonably be ensured through the use of general special 
controls, such as performance standards, post-market surveillance, patient 
registries, and FDA guidelines. Class III devices are devices which must 
receive pre-market approval by the FDA to ensure their safety and 
effectiveness. Generally, Class III devices are life-sustaining, 
life-supporting or implantable devices, or new devices which have been found 
not to be substantially equivalent to legally marketed devices.  

       Before a new medical device may be introduced into the market in the 
United States, the manufacturer or distributor generally must obtain either 
FDA clearance of a section 510(k) premarket notification or FDA approval of a 
premarket approval ("PMA") application.  

       If the manufacturer or distributor can establish that the device is 
"substantially equivalent" to a legally marketed Class I or Class II medical 
device or to a Class III medical device for which the FDA has not required a 
PMA (the "predicated device"), the manufacturer or distributor may seek FDA 
marketing clearance for the device by filing a 510(k) notification. In a 
510(k) filing, the manufacturer or distributor is required to demonstrate 
that the device has the same intended use and the same technological 
characteristics as the predicate device or has different technological 
characteristics that do not raise different questions of safety and efficacy 
than the predicate device. A 510(k) notification must contain information to 
support the claim of substantial equivalence, which may include laboratory 
test results or the results of clinical studies.  Following submission of a 
510(k) notification, the manufacturer or distributor may not place the device 
into commercial distribution until an order of substantial equivalence is 
issued by the FDA. The Company understands that the FDA has been requiring a 
more rigorous demonstration of substantial equivalence in connection with 
510(k) notifications. Although it generally takes from four to twelve months 
from the date of submission to obtain a 510(k) clearance, it may take longer. 
FDA regulations do not specify the time in which it must respond to a 510(k) 
submission. The FDA may determine that the proposed device is not 
substantially equivalent to a legally marketed device, or may require further 
information, such as additional test data, before the FDA is able to make a 
substantial equivalence determination. Such determination or request for 
additional information could delay the Company's market introduction of its 
future products and could have a materially adverse effect on the Company's 
continued operations. Further, for any of the Company's devices cleared 
through the 510(k) process, modifications or enhancements that could 
significantly change safety or effectiveness or constitute a major change in 
the intended use of the device will require a new 510(k) submission. The 
Company's IOS point-of-care instrument tests currently are regulated as Class 
II medical devices.  The Company has received 510(k) clearances for the 
instrument and the T4 and T Uptake tests, the T4-only test, the qualitative 
serum pregnancy test, the TSH test and the quantitative hCG test in 1995 and 
1996.  

       If a manufacturer or distributor cannot establish that a proposed 
device is substantially equivalent to another legally marketed predicate 


                                       12.

<PAGE>

device, the manufacturer or distributor must seek pre-market approval of the 
proposed device through submission of a PMA application. A PMA application 
must be supported by extensive data, including pre-clinical and clinical 
trial data to prove the safety and efficacy of the device, as well as 
extensive manufacturing information. If human clinical trials are required 
and the device presents "a significant risk," the sponsor of the trial 
(usually the manufacturer or distributor) is required to file an 
investigational device exemption ("IDE") application with the FDA before 
commencing human clinical trials. The IDE application must be supported by 
data, typically including the results of laboratory and animal testing. If 
the IDE application is approved by the FDA and one or more appropriate 
institutional review boards ("IRBs"), human clinical trials may begin at a 
specific number of investigational sites with a specific number of subjects, 
as approved by FDA. If the device presents a "nonsignificant risk" to 
subjects, a sponsor may begin the clinical trial after obtaining approval of 
one or more appropriate IRBs without the need for FDA approval. An IDE 
supplement must be submitted to and approved by the FDA before a sponsor or 
investigator may make a change to the investigational plan that may affect 
its scientific soundness or the rights, safety or welfare of human subjects.  
A PMA application must contain the results of clinical trials, the results of 
any relevant bench tests, laboratory and animal studies, a complete 
description of the device and its components, and a detailed description of 
the methods, facilities and controls used to manufacture the device. The 
submission also must include the proposed labeling, advertising and training 
methods, if required. Upon receipt, the FDA conducts a preliminary review of 
the PMA application to determine whether the submission is sufficiently 
complete to permit a substantive review. If sufficiently complete, the 
submission is declared fileable by the FDA. By statute, the FDA has 180 days 
to review a PMA application, although the review time often is extended 
significantly by the FDA asking for more information or clarification of 
information already provided in the submission.  While the FDA has responded 
to PMA applications within the allotted time period, PMA reviews more often 
occur over a significantly protracted time period and generally take 
approximately 12 to 24 months or more from the date of filing to approval. 
The FDA also will inspect the manufacturing facilities to ensure compliance 
with the FDA's GMP requirements prior to approval of a PMA. This is a lengthy 
and expensive process, and there can be no assurance that such approval will 
be obtained for any future product the Company may develop which may be 
determined to be subject to such requirements. A number of devices for which 
PMA marketing clearance has been sought by others have never been cleared for 
marketing. Modifications to a device that is subject of an approved PMA, its 
labeling or manufacturing process may require FDA approval of new PMAs or PMA 
supplements, which often require submission of the same type of information 
required for the initial PMA. There can be no assurance that any of the 
Company's future products will ever obtain the necessary FDA regulatory 
clearance for commercial distribution.

       Any products distributed by Biocircuits pursuant to the above 
described clearances are subject to pervasive and continuing regulation by 
the FDA. The Company also will be required to manufacture its products in 
registered establishments and in accordance with GMP regulations. There can 
be no assurance that the Company or its OEM suppliers' facilities will meet 
GMP requirements. Failure to meet such requirements could result in certain 
actions by the FDA, including the possible shutdown of the Company's 
manufacturing facilities.  In addition, the FDA has enacted changes to the 
GMP regulations that may increase the cost of compliance with GMPs. The 
Company's facility will be subject to periodic inspections by the FDA for 
compliance with GMP and other applicable requirements.  Labeling and 
promotional activities are subject to scrutiny by the FDA and, in certain 
instances, by the Federal Trade Commission. Current FDA enforcement policy 
strictly prohibits marketing of medical devices for unapproved uses. The 
export of medical devices also is subject to regulation in certain instances. 
In addition, the use of the Company's products may be regulated by various 
state agencies. For example, the Company was required to obtain a license 
from the State of California to manufacture its proposed products. There can 
be no assurance that the Company's proposed products will be able to comply 
successfully with any such requirements or regulations.

       The potential market for the Company's products may be affected by the 
CLIA. The CLIA establishes requirements for any facility that performs 
laboratory testing on human specimens for the purpose of providing 
information for diagnosis or treatment of human beings. The CLIA covers such 
testing in virtually all settings, including physicians' offices.

                                       13.

<PAGE>


Regulations implementing CLIA establish requirements for laboratories in such 
areas as administration, participation in proficiency testing, patient test 
management, quality control, personnel, quality assurance and inspection. 
Under these regulations, the specific requirements that a laboratory must 
meet depend upon the complexity of the tests performed by the laboratory. 
Laboratory tests are categorized as either waived tests, tests of moderate 
complexity or tests of high complexity. Laboratories that perform either 
moderate or high complexity tests must meet standards in all areas, with the 
major difference in requirements between moderate and high complexity testing 
concerning quality control and personnel standards. Quality control standards 
for moderate complexity testing are being implemented in stages. Laboratories 
performing high complexity testing must meet all the quality control 
requirements by the effective date of the regulations. Personnel standards 
for high complexity testing are more rigorous than those for moderate 
complexity testing. In general, personnel conducting high complexity testing 
will need more education and experience than those doing moderate complexity 
testing. Under the CLIA regulations, all laboratories performing moderately 
complex or highly complex tests will be required to obtain either a 
registration certificate or certification of accreditation from the Health 
Care Financing Administration ("HCFA").

       The Company's IOS system has been classified as testing of moderate 
complexity, and thus any laboratory using such products would have to meet 
the regulatory requirements for testing of moderate complexity. However, it 
is possible that the Company's products could be categorized as tests of high 
complexity in the future, in which case the Company's penetration of the 
point-of-care market would be reduced since not all laboratories would meet 
the standards required to conduct such tests. The Company understands that 
laboratories, including physician office laboratories, will be evaluating the 
requirements of the CLIA in determining whether to perform certain types of 
moderate and high complexity diagnostic tests. The Company believes that the 
sale of its proposed products will not be adversely affected by the CLIA. 
However, no assurances can be given that the statute and its implementing 
regulations will not have a materially adverse impact on the Company and its 
ability to market and sell its IOS system or any future products that the 
Company may develop.

       Although Biocircuits believes that it will be able to comply with all 
applicable regulations regarding the manufacture and sale of diagnostic 
devices, such regulations are always subject to change and depend heavily 
upon administrative interpretations. There can be no assurance that future 
changes in regulations or interpretations made by the U.S. Department of 
Health and Human Services, FDA, HCFA or other regulatory bodies, with 
possible retroactive effect, will not adversely affect the Company. In 
addition to the foregoing, Biocircuits is subject to numerous federal, state 
and local laws and regulations relating to such matters as safe working 
conditions, laboratory and manufacturing practices, environmental, fire 
hazard control, and disposal of hazardous or potentially hazardous 
substances. To date,compliance with these laws and regulations has not had a 
material effect on the Company's financial results, capital requirements or 
competitive position, and the Company has no plans for material capital 
expenditures relating to such matters. However, there can be no assurance 
that it will not be required to incur significant costs to comply with such 
laws and regulations in the future, or that such laws or regulations will not 
have a materially adverse effect upon the Company's ability to do business.

       Sales of medical devices outside the United States are subject to 
foreign regulatory requirements that vary widely from country to country. The 
time required to obtain registrations or approvals required by foreign 
countries may be longer or shorter than that required for FDA clearance or 
approval, and requirements for licensing may differ significantly from FDA 
requirements.  Some countries historically have permitted human studies 
earlier in the product development cycle than regulations in the United 
States permit. Other countries have requirements similar to those of the 
United States. This disparity in the regulation of medical devices may result 
in slower product clearance in certain countries than in others. Furthermore, 
the introduction of the Company's IOS system or any future products in 
foreign markets might require obtaining foreign regulatory clearances. There 
can be no assurance that the Company will be able to obtain regulatory 
clearances for its current or any future products in the United States or in 
foreign markets.

                                       14.

<PAGE>


NEED TO RETAIN AND ATTRACT KEY EMPLOYEES

       The Company is highly dependent upon the principal members of its 
management and scientific staff, the loss of whose services might impede the 
achievement of the Company's business objectives. Furthermore, recruiting and 
retaining additional qualified scientific, manufacturing, marketing and sales 
personnel also will be critical to the Company's success.  The Company faces 
competition for qualified individuals from numerous manufacturers of medical 
products and other high technology products, as well as universities and 
academic institutions.  There can be no assurance that the Company will be 
able to attract and retain qualified personnel on acceptable terms.

POTENTIAL ADVERSE IMPACT OF REIMBURSEMENT POLICIES

       Political, economic and regulatory influences are subjecting the 
healthcare industry in the United States to fundamental change. Although 
Congress has failed to pass comprehensive health care reform legislation to 
date, the Company anticipates that Congress, state legislatures and the 
private sector will continue to review and assess alternative benefits, 
controls on health care spending through limitations on the growth of private 
health insurance premiums and Medicare and Medicaid spending, the creation of 
large insurance purchasing groups, price controls on pharmaceuticals and 
other fundamental changes to the health care delivery system. Any such 
proposed or actual changes could cause any potential partners of the Company 
to limit or eliminate spending on collaborative development projects. 
Legislative debate is expected to continue in the future, market forces are 
expected to demand reduced costs and Biocircuits cannot predict what impact 
the adoption of any federal or state health care reform measures or future 
private sector reforms may have on its business. 

       In both domestic and foreign markets, sales of the Company's IOS 
point-of-care system and other potential products, if any, will depend in 
part on the availability of reimbursement from third-party payors such as 
government health administration authorities, private health insurers and 
other organizations. Third-party payors are increasingly challenging the 
price and cost effectiveness of medical products and services. Significant 
uncertainty exists as to the reimbursement status of newly approved health 
care products.  There can be no assurance that the Company's products will be 
considered cost effective or that adequate third-party reimbursement will be 
available to enable Biocircuits to maintain price levels sufficient to 
realize an appropriate return on its investment in product development. 
Legislation and regulations affecting the pricing of health care services may 
change, which could affect the Company's products and could further limit 
reimbursement for medical products and services.

RISK OF PRODUCT LIABILITY; POSSIBLE UNAVAILABILITY OF INSURANCE

       Testing, manufacturing and marketing of the Company's potential 
products will entail risk of product liability.  The Company currently has 
product liability insurance.  However, there can be no assurance that the 
Company will be able to maintain such insurance at a reasonable cost or in 
sufficient amounts to protect the Company against losses due to product 
liability.  An inability to maintain insurance at an acceptable cost or to 
otherwise protect against potential product liability could prevent or 
inhibit the commercialization of the Company's products.  In addition, a 
product liability claim or recall could have a material adverse effect on the 
business or financial condition of Biocircuits.

HAZARDOUS MATERIALS

       The Company's research and development involves the controlled use of 
hazardous materials and chemicals.  Although the Company believes that its 
safety procedures for handling and disposing of such materials comply with 
the standards prescribed by state and federal regulations, the risk of 
accidental contamination or injury from these materials cannot be completely 
eliminated. In the event of such an accident, the Company could be held 
liable for any damages that result and any such liability could exceed the 
resources of the Company.  The Company may incur substantial costs to comply 
with environmental regulations.

                                       15.

<PAGE>

ANTI-TAKEOVER EFFECT OF DELAWARE LAW AND CERTAIN CHARTER PROVISIONS

       The Board of Directors has authority to issue up to 10,000,000 shares 
of Preferred Stock, in addition to the 30,000,000 designated shares of Series 
A Preferred Stock, and to fix the rights, preferences, privileges and 
restrictions, including voting rights, of those shares without any further 
vote or action by the stockholders.  The rights of the holders of the Common 
Stock will be subject to, and may be adversely affected by, the rights of the 
holders of the outstanding Series A Preferred Stock and any other Preferred 
Stock that may be issued in the future.  The outstanding Series A Preferred 
Stock could have the effect of making it more difficult for a third party to 
acquire a majority of the outstanding voting stock of the Company. 
Furthermore, certain provisions of the Company's Amended and Restated 
Certificate of Incorporation, such as a classified Board of Directors, its 
Amended and Restated Bylaws and of Delaware law could delay or make more 
difficult a merger, tender offer or proxy contest involving the Company.

VOLATILITY OF STOCK PRICE

       The market price of the Company's Common Stock, like that of the 
common stock of many other medical device and other high technology 
companies, has been highly volatile.  Factors such as delays in obtaining FDA 
approval for the IOS point-of-care system, fluctuations in the Company's 
actual or anticipated operating results, announcements of technological 
innovations or new commercial products by the Company or its competitors, 
governmental regulation, changes in the current structure of the health care 
financing and payment systems in the United States, developments in or 
disputes regarding patent or other proprietary rights, economic and other 
external factors and general market conditions may have a significant effect 
on the market price of the Common Stock.

CONCENTRATION OF SHARE OWNERSHIP

       Based upon the shares outstanding as of September 30, 1996, the 
Company's officers, directors and their affiliates as a group beneficially 
owned approximately 52.54% of the Company's outstanding Common Stock and 
Series A Preferred Stock (on an as-converted basis).  As a result, these 
stockholders will be able to exercise significant influence over all matters 
requiring stockholder approval, including the election of directors and 
approval of significant corporate transactions.

                                       16.

<PAGE>


                          THE COMPANY

       Biocircuits Corporation was incorporated in Delaware in March 1989.  
The Company's executive offices are located at 1324 Chesapeake Terrace, 
Sunnyvale, California 94089, and its telephone number is (408) 745-1961.  

                         USE OF PROCEEDS

       The Company will not receive any of the proceeds from the sale of the 
Shares by the Selling Securityholders.  The net proceeds from the exercise of 
the Warrants received by the Company will be considered uncommitted funds 
that may be used by the Company for general corporate purposes, including 
sales and marketing and research and development.

                         DIVIDEND POLICY

       The Company has never paid cash dividends.  The Company's Board of 
Directors currently intends to retain any earnings for use in the Company's 
business and does not anticipate paying any cash dividends in the foreseeable 
future.


                                       17.


<PAGE>

                           SELLING SECURITYHOLDERS

     The following table sets forth the names of the Selling Securityholders, 
the number of shares of Common Stock owned by each Selling Securityholder 
prior to this offering, the number of shares of Common Stock being offered 
for the account of each Selling Securityholder and the number of shares of 
Common Stock to be owned by each Selling Securityholder after completion of 
this offering.  This information is based upon information provided by the 
Selling Securityholders. Because the Selling Securityholders may offer all, 
some or none of their Common Stock, no definitive estimate as to the number 
of Shares thereof that will be held by the Selling Securityholders after such 
offering can be provided.

<TABLE>
<CAPTION>
                                       SHARES BENEFICIALLY          SHARES BEING      SHARES BENEFICIALLY
SELLING SECURITYHOLDER             OWNED PRIOR TO OFFERING (1)(2)    OFFERED(2)    OWNED AFTER OFFERING(1)(3)
- ----------------------             ------------------------------   ------------   --------------------------
<S>                                <C>                              <C>            <C> 

Beckman Instruments, Inc.                  1,334,072                  1,334,072                 0

KMC Systems, Inc.                            250,000                    250,000                 0

Venture Lending, a division of
  Cupertino National Bank & Trust
  Company                                     12,233(4)                   4,605             7,628

Total:                                                                1,588,677
</TABLE>













- ----------------------

(1)  Unless otherwise indicated below, the persons named in the table have or 
     will have sole voting and investment power with respect to all shares 
     beneficially owned by them, subject to community property laws where 
     applicable.

(2)  Assumes exercise of the Warrants.

(3)  Assumes the sale of all Shares offered hereby.  The Company has agreed 
     to pay all reasonable fees and expenses incident to the filing of this 
     offering. See "Plan of Distribution."

(4)  Includes 7,628 shares of Common Stock issuable upon the exercise of
     Warrants issued in previous financings.

                                      18.
<PAGE>

                             PLAN OF DISTRIBUTION

     The Shares may be offered by the Selling Securityholders from time to 
time in transactions on the Nasdaq National Market System, in privately 
negotiated transactions or a combination of such methods of sale, at fixed 
prices that may be changed, at market prices prevailing at the time of sale, 
at prices related to such prevailing market prices or at negotiated prices.  
The Selling Securityholders may effect such transactions by selling the 
Shares directly or by or through agents or broker-dealers who may receive 
compensation in the form of discounts, concessions or commissions from the 
Selling Securityholders or the purchasers of the Shares for whom such 
broker-dealers may act as agent or to whom they sell as principal or both 
(which compensation to a particular broker-dealer might be in excess of 
customary commissions).

     The Selling Securityholders and any underwriters, dealers or agents that 
participate in the distribution of the Shares may be deemed to be 
"underwriters" within the meaning of the Securities Act, and any discounts, 
commissions or concessions received by them and any provided pursuant to the 
sale of the Shares by them might be deemed to be underwriting discounts and 
commissions under the Securities Act.   In order to comply with the 
securities laws of certain states, if applicable, the Shares will be sold in 
such jurisdictions only through registered or licensed brokers or dealers.  
In addition, in certain states the Shares may not be sold unless it has been 
registered or qualified for sale in the applicable state or an exemption from 
the registration or qualification requirement is available and is complied 
with.

     Under applicable rules and regulations under the Exchange Act, any 
person engaged in the distribution of the Shares may not simultaneously 
engage in market making activities with respect to such Shares for a period 
of nine business days prior to the commencement of such distribution.  In 
addition and without limiting the foregoing, each Selling Securityholder will 
be subject to applicable provisions of the Exchange Act and the rules and 
regulations thereunder, including, without limitation, Rules 10b-2, 10b-6 and 
10b-7, which may limit the timing of purchases and sales of the Shares by the 
Selling Securityholders.

     The Company entered into agreements with the Selling Securityholders to 
register their Shares under applicable federal and state securities laws.  
The Company will pay substantially all of the expenses incident to the 
offering and sale of the Shares to the public, other than commissions, 
concessions and discounts of underwriters, dealers or agents.  Such expenses 
(excluding such commissions and discounts) are estimated to be $21,565.00.  
Such agreements provide for cross-indemnification of the Selling 
Securityholders and the Company to the extent permitted by law, for losses, 
claims, damages, liabilities and expenses arising, under certain 
circumstances, out of any registration of the Shares.


                                      19.
<PAGE>

                                LEGAL MATTERS

     The validity of the securities offered hereby will be passed upon for 
the Company by Cooley Godward LLP, Palo Alto, California.

                                   EXPERTS

     The financial statements of Biocircuits Corporation appearing in 
Biocircuits Corporation's Annual Report (Form 10-K) for the year ended 
December 31, 1995 have been audited by Ernst & Young LLP, independent 
auditors, as set forth in their report thereon (which contains an explanatory 
paragraph with respect to the Company's ability to continue as a going 
concern) included therein and incorporated herein by reference.  Such 
financial statements are, and audited financial statements to be included in 
subsequently filed documents will be, incorporated herein in reliance upon 
the reports of Ernst & Young LLP pertaining to such financial statements (to 
the extent covered by consents filed with the Securities and Exchange 
Commission) given upon the authority of such firm as experts in accounting 
and auditing.

                                      20.
<PAGE>

- ------------------------------------------------------------------------------
- ------------------------------------------------------------------------------


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. THIS PROSPECTUS DOES NOT 
CONSTITUTE AN OFFER OF ANY SECURITIES OTHER THAN THOSE TO WHICH IT RELATES OR 
AN OFFER TO SELL, OR A SOLICITATION OF AN OFFER TO BUY, TO ANY PERSON IN ANY 
JURISDICTION WHERE SUCH OFFER OR SOLICITATION WOULD BE UNLAWFUL. 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 TIME SUBSEQUENT TO THE DATE HEREOF.

                                 -----------------

                                 TABLE OF CONTENTS

                                                                        Page
                                                                        ----
Available Information.....................................................3
Incorporation of Certain Documents by Reference...........................3
Summary Information.......................................................5
The Offering..............................................................6
Risk Factors..............................................................7
The Company...............................................................17
Use of Proceeds...........................................................17
Dividend Policy...........................................................17
Selling Securityholders...................................................18
Plan of Distribution......................................................19
Legal Matters.............................................................20
Experts...................................................................20


- ------------------------------------------------------------------------------
- ------------------------------------------------------------------------------


- ------------------------------------------------------------------------------
- ------------------------------------------------------------------------------


                               1,588,677 SHARES



                            BIOCIRCUITS CORPORATION


                                 COMMON STOCK



                                  ----------
                                  PROSPECTUS
                                  ----------



                                JANUARY 15, 1997



- ------------------------------------------------------------------------------
- ------------------------------------------------------------------------------


<PAGE>

                                    PART II
                      INFORMATION NOT REQUIRED IN PROSPECTUS

ITEM 14. OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION

     The following table sets forth the expenses payable by the Company in 
connection with the sale, issuance and distribution of the securities being 
registered, other than underwriting discounts and commissions.  All amounts 
are estimates except the SEC registration fee.  None of these expenses will 
be paid by the Selling Securityholders.

     SEC Registration Fee................... $    1,565.00
     Printing and Engraving Expenses........      2,500.00
     Legal Fees and Expenses................     10,000.00
     Accounting Fees and Expenses...........      7,500.00
                                                 ---------

     Total.................................. $   21,565.00


ITEM 15.  INDEMNIFICATION OF DIRECTORS AND OFFICERS.

     The Registrant's Amended and Restated Certificate of Incorporation and 
Amended and Restated Bylaws include provisions to (i) eliminate the personal 
liability of its directors for monetary damages resulting from breaches of 
their fiduciary duty to the extent permitted by Section 102(b)(7) of the 
General Corporation Law of Delaware (the "Delaware Law") and (ii) require the 
Registrant to indemnify its directors and officers to the fullest extent 
permitted by Section 145 of the Delaware Law, including circumstances in 
which indemnification is otherwise discretionary.  Pursuant to Section 145 of 
the Delaware Law, a corporation generally has the power to indemnify its 
present and former directors, officers, employees and agents against expenses 
incurred by them in connection with any suit to which they are, or are 
threatened to be made, a party by reason of their serving in such positions 
so long as they acted in good faith and in a manner they reasonably believed 
to be in, or not opposed to, the best interests of a corporation, and, with 
respect to any criminal action, they had no reasonable cause to believe their 
conduct was unlawful.  The Registrant believes that these provisions are 
necessary to attract and retain qualified persons as directors and officers. 
These provisions do not eliminate liability for breach of the director's duty 
of loyalty to the Registrant or its stockholders, for acts or omissions not 
in good faith or involving intentional misconduct or knowing violations of 
law, for any transaction from which the director derived an improper personal 
benefit or for any willful or negligent payment of any unlawful dividend or 
any unlawful stock purchase agreement or redemption.   

     The Registrant has entered into agreements with its directors and 
executive officers that require the Registrant to indemnify such persons 
against expenses, judgments, fines, settlements and other amounts actually 
and reasonably incurred (including expenses of a derivative action) in 
connection with any proceeding, whether actual or threatened, to which any 
such person may be made a party by reason of the fact that such person is or 
was a director or officer of the Registrant or any of its listed enterprises, 
provided 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 
Registrant and, with respect to any criminal proceeding, had no reasonable 
cause to believe his or her conduct was unlawful. The indemnification 
agreements also set forth certain procedures that will apply in the event of 
a claim for indemnification thereunder. 


                                     II-1
<PAGE>
ITEM 16. EXHIBITS AND FINANCIAL STATEMENT SCHEDULES.

EXHIBIT
NUMBER   DESCRIPTION 

3.1      Amended and Restated Certificate of Incorporation.(1)
3.2      Amended and Restated Bylaws.(2)
4.1      Convertible Note Purchase Agreement, dated August 15, 1995 between the
         Company and Beckman Instruments, Inc. ("Beckman").(3)
4.2      Convertible Secured Promissory Note (the "Note"), dated August 15, 
         1995, in the amount of $3,500,000 made by the Company in favor 
         of Beckman.(3)
4.3      Investor Rights Agreement (the "Rights Agreement"), dated August 15, 
         1995, between the Company and Beckman.(3)
4.4      Specimen Stock Certificate.
4.5      Form of Warrant issued to Beckman.
4.6      Form of Warrant issued to Kollsman.
4.7      Form of Warrant issued to Venture Lending.
5.1      Opinion of Cooley Godward LLP.
23.1     Consent of Ernst & Young LLP, Independent Auditors.
23.2     Consent of Cooley Godward LLP.  Reference is made to 5.1.
24.1     Power of Attorney (included on signature page II-4).


- -----------------
(1)   Filed as an exhibit to the Registration Statement on Form S-3 
      (No. 33-93736), incorporated herein by reference.
(2)   Filed as an exhibit to the Registration Statement on Form S-1 
      (No. 33-46587), as amended, and incorporated herein by reference.
(3)   Filed as an exhibit to the Quarterly Report on Form 10-Q for the 
      quarter ended September 30, 1995.

ITEM 17. UNDERTAKINGS.

      The undersigned registrant hereby undertakes:

(1)   To file, during any period in which offers or sales are being made, a 
      post-effective amendment to this registration statement to include any 
      material information with respect to the plan of distribution not 
      previously disclosed in the registration statement or any material 
      change to such information in the registration statement;

(2)   That, for the purpose of determining any liability under the 
      Securities 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; and

(3)   To remove from registration by means of a post-effective amendment any 
      of the securities being registered which remain unsold at the 
      termination of the offering.  The undersigned registrant hereby 
      undertakes that, for purposes of determining any liability under the 
      Securities Act of 1933, each filing of the registrant's annual report 
      pursuant to Section 13(a) or 15(d) of the Securities Exchange Act of 
      1934 (and, where applicable, each filing of an employee benefit plan's 
      annual report pursuant to Section 15(d) of the Securities Exchange Act 
      of 1934) that is incorporated by reference in the registration 
      statement 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. Insofar as indemnification for liabilities arising under the 
      Securities Act may be permitted to directors, officers and controlling 
      persons of the registrant pursuant to provisions described in Item 15, 
      or otherwise, the registrant has been advised 


                                     II-2
<PAGE>

      that in the opinion of the Securities and Exchange Commission such 
      indemnification is against public policy as expressed in the 
      Securities 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 Securities Act and will be governed by the final 
      adjudication of such issue.
















                                     II-3
<PAGE>

                                  SIGNATURES

Pursuant to the requirements of the Securities Act of 1933, the registrant 
certifies that it has reasonable grounds to believe that it meets all of the 
requirements for filing on Form S-3 and has duly caused this registration 
statement to be signed on its behalf by the undersigned, thereunto duly 
authorized, in the city of Sunnyvale, State of California, as of January 15, 
1997.

                                             BIOCIRCUITS CORPORATION


                                             By /s/
                                                ________________________
                                                  John Kaiser
                                                  President and Chief Executive
                                                  Officer




                                POWER OF ATTORNEY

     KNOW ALL PERSONS BY THESE PRESENTS, that each person whose signature 
appears below constitutes and appoints Donald Hawthorne and John Kaiser, and 
each or either of them, his true and lawful attorneys-in-fact and agent, 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 
file the same, with all 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 in connection therewith, as fully to all intents and purposes as he 
might or could do in person, hereby ratifying and confirming all that said 
attorneys-in-fact and agents, or any of them, or their or his substitutes or 
substitute, 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 BY THE FOLLOWING PERSONS IN THE 
CAPACITIES AND ON THE DATE INDICATED.

SIGNATURE                         TITLE                          DATE


/s/
- ----------------------     President, Chief Executive        January 15, 1997
John Kaiser                Officer and Director


/s/
- ----------------------     Vice President, Chief Financial   January 15, 1997
Donald B. Hawthorne        Officer and Secretary 


                                     II-4
<PAGE>

SIGNATURE                         TITLE                       DATE




/s/
- ----------------------     Director                          January 15, 1997
Robert Curry, Ph.D.


/s/
- ----------------------     Director                          January 15, 1997
Patrick Latterell


/s/
- ----------------------     Director                          January 15, 1997
Hans O. Ribi, Ph.D.


/s/
- ----------------------     Director                          January 15, 1997
David Rubinfien






<PAGE>
                                  EXHIBIT 4.4

       COMMON STOCK                                          COMMON STOCK
          NUMBER                                                 SHARES
                               BIOCIRCUITS CORPORATION

                 INCORPORATED UNDER THE LAWS OF THE STATE OF DELAWARE

    THIS CERTIFICATE IS                               SEE REVERSE FOR CERTAIN
  TRANSFERABLE IN BOSTON,                                DEFINITIONS AND A
    MA AND NEW YORK, NY       INCORPORATED UNDER    STATEMENT AS TO THE RIGHTS,
                                THE LAWS OF THE     PREFERENCES, PRIVILEGES AND
                               STATE OF DELAWARE       RESTRICTIONS OF SHARES


    THIS CERTIFIES THAT

                                       SPECIMEN

IS THE OWNER OF

FULLY PAID AND NON-ASSESSABLE SHARES OF THE COMMON STOCK, PAR VALUE OF $.001 PER
SHARE OF

                               BIOCIRCUITS CORPORATION

transferable on the books of the Corporation by the holder hereof in person or
by duly authorized attorney upon surrender of this Certificate properly
endorsed.  This Certificate is not valid until countersigned and registered by
the Transfer Agent and Registrar.
    WITNESS the facsimile seal of the Corporation and the facsimile signature
of its duly authorized officers.

Dated

                               BIOCIRCUITS CORPORATION
                                     INCORPORATED
                                       MARCH 7,
                                         1989
                                       DELAWARE

    /s/ Donald B. Hawthorne                                  /s/ John Kaiser

         SECRETARY                                          PRESIDENT AND CEO


<PAGE>

                               BIOCIRCUITS CORPORATION

    The Corporation is authorized to issue Common Stock and Preferred Stock.
The Board of Directors of the Corporation has authority to fix the number of
shares and the designation of any series of Preferred Stock and to determine or
alter the rights, preferences, privileges, and restrictions granted to or
imposed upon any unissued shares of Preferred Stock.
    The Corporation will furnish to any stockholder, upon request and without
charge, a statement of the powers, designations, preferences and relative,
participating, optional or other special rights of each class of stock or series
thereof and the qualifications, limitations or restrictions of such preferences
and/or rights, so far as the same shall have been fixed, and of the authority
of the Board of Directors to designate and fix any preferences, rights and
limitations of any wholly unissued series.  Any such request should be addressed
to the Secretary of the Corporation at its principal office.

    The following abbreviations, when used in the inscription on the face of
this certificate, shall be construed as though they were written out in full
according to applicable laws or regulations:

TEN COM--as tenants in common           UNIF GIFT MIN ACT _____ Custodian _____
TEN ENT--as tenants by the entireties                     (Cust)         (Minor)
JT TEN --as joint tenants with right               under Uniform Gifts to Minors
         of survivorship and not as                Act _______________
         tenant in common                                 (State)

                                   UNIF TRF MIN ACT____ Custodian (until age)___
                                         _______ under Uniform Transfers
                                         (Minor)
                                         to Minors Act _______
                                                       (State)


        Additional abbreviations may also be used though not in the above list.

    For Value received, _________________ hereby sell, assign and transfer unto

  PLEASE INSERT SOCIAL SECURITY OR OTHER
     IDENTIFYING NUMBER OF ASSIGNEE
________________________________________________________________________________

________________________________________________________________________________

________________________________________________________________________________

     (NAME AND ADDRESS INCLUDING POSTAL ZIP CODE OF TRANSFEREE SHOULD BE
                            PRINTED OR TYPEWRITTEN)

_________________________________________________________________________ Shares
of the Common Stock represented by the within Certificate and do hereby
irrevocably constitute and appoint

_______________________________________________________________________ Attorney
to transfer the said Shares on the books of the within-named Corporation, with
full power of substitution in the premises.

Dated ________________________________


                                  _____________________________________________
                                                      SIGNATURE

                                  _____________________________________________
                                                      SIGNATURE


Signature Guaranteed:

___________________________________________________
THE SIGNATURE SHOULD BE GUARANTEED BY A COMMERCIAL
BANK OR A MEMBER BROKER OF EITHER THE NEW YORK STOCK
EXCHANGE, AMERICAN STOCK EXCHANGE, MIDWEST
STOCK EXCHANGE OR PACIFIC STOCK EXCHANGE

____________________________________________________________
NOTICE:  THE SIGNATURE TO THIS ASSIGNMENT MUST CORRESPOND
WITH THE NAME(S) AS WRITTEN UPON THE FACE OF THE CERTIFICATE
IN EVERY PARTICULAR, WITHOUT ALTERATION OR ENLARGEMENT OR
ANY CHANGE WHATEVER.

<PAGE>

                               EXHIBIT 4.5

              [Form of Warrant Issued to Beckman Instruments, Inc.]

THE SECURITIES REPRESENTED HEREBY HAVE NOT BEEN REGISTERED UNDER THE 
SECURITIES ACT OF 1933, AS AMENDED (THE "ACT"), OR UNDER THE SECURITIES LAWS 
OF ANY STATE. THESE SECURITIES ARE SUBJECT TO RESTRICTIONS ON TRANSFERABILITY 
AND RESALE AND MAY NOT BE TRANSFERRED OR RESOLD EXCEPT AS PERMITTED UNDER THE 
ACT AND THE APPLICABLE STATE SECURITIES LAWS, PURSUANT TO REGISTRATION OR 
EXEMPTION THEREFROM.  THE ISSUER OF THESE SECURITIES MAY REQUIRE AN OPINION 
OF COUNSEL IN FORM AND SUBSTANCE SATISFACTORY TO THE ISSUER TO THE EFFECT 
THAT ANY PROPOSED TRANSFER OR RESALE IS IN COMPLIANCE WITH THE ACT AND ANY 
APPLICABLE STATE SECURITIES LAWS.

                             BIOCIRCUITS CORPORATION

               WARRANT FOR THE PURCHASE OF SHARES OF COMMON STOCK


No. 1996-B1                                                      222,345 shares


     FOR VALUE RECEIVED, BIOCIRCUITS CORPORATION, a Delaware corporation (the 
"Company"), with its principal office at 1324 Chesapeake Terrace, Sunnyvale, 
California 94089, hereby certifies that Beckman Instruments, Inc. ("Holder"), 
or its assigns, in consideration for payment of $100.00, is entitled, subject 
to the provisions of this Warrant and pursuant to the terms of that certain 
Convertible Secured Promissory Note dated August 15, 1995, as amended, (the 
"Note") to purchase from the Company, at any time before 5:00 p.m. (Pacific 
Standard Time) August 15, 2000 (the "Expiration Date"), such number of fully 
paid and nonassessable shares of Common Stock of the Company set forth 
above, subject to adjustment as hereinafter provided.

     Holder may purchase such number of shares of Common Stock at a purchase 
price per share of $3.4469311 (the "Exercise Price").  The term "Common 
Stock" shall mean the aforementioned Common Stock of the Company, together 
with any other equity securities that may be issued by the Company in 
addition thereto or in substitution therefor as provided herein.

     The number of shares of Common Stock to be received upon the exercise of 
this Warrant and the price to be paid for a share of Common Stock are subject 
to adjustment from time to time as hereinafter set forth.  The shares of 
Common Stock deliverable upon such exercise, as adjusted from time to time, 
are hereinafter sometimes referred to as "Warrant Shares."

     SECTION 1.  EXERCISE OF WARRANT.  This Warrant may be exercised in whole 
or in part on any business day on or prior to the Expiration Date by 
presentation and surrender hereof to the Company at its principal office at 
the address set forth in the initial paragraph hereof (or at such other 
address as the Company may hereafter notify Holder in writing) with the 
Purchase
                                       1.
<PAGE>

Form annexed hereto duly executed and accompanied by proper payment of 
the Exercise Price in lawful money of the United States of America in the 
form of a check, subject to collection, for the number of Warrant Shares 
specified in the Purchase Form.  If this Warrant should be exercised in part 
only, the Company shall, upon surrender of this Warrant, execute and deliver 
a new Warrant evidencing the rights of Holder thereof to purchase the balance 
of the Warrant Shares purchasable hereunder.  Upon receipt by the Company of 
this Warrant and such Purchase Form, together with proper payment of the 
Exercise Price, at such office, Holder shall be deemed to be the holder of 
record of the Warrant Shares, notwithstanding that the stock transfer books 
of the Company shall then be closed or that certificates representing such 
Warrant Shares shall not then be actually delivered to Holder.  The Company 
shall pay any and all documentary stamp or similar issue or transfer taxes 
payable in respect of the issue or delivery of the Warrant Shares.

     SECTION 2.  RESERVATION OF SHARES.  The Company hereby agrees that at 
all times there shall be reserved for issuance and delivery upon exercise of 
this Warrant all shares of its Common Stock or other shares of capital stock 
of the Company from time to time issuable upon exercise of this Warrant.  All 
such shares shall be duly authorized and, when issued upon such exercise in 
accordance with the terms of this Warrant, shall be validly issued, fully 
paid and nonassessable, free and clear of all liens, security interests, 
charges and other encumbrances or restrictions on sale (other than as 
provided in the Company's certificate of incorporation and any restrictions 
on sale set forth herein or pursuant to applicable federal and state 
securities laws) and free and clear of all preemptive rights.

     SECTION 3.  FRACTIONAL INTEREST.  The Company will not issue a 
fractional share of Common Stock upon exercise of a Warrant.  Instead, the 
Company will deliver its check for the Exercise Price of the fractional 
share.  The Exercise Price of a fraction of a share is determined as follows: 
multiply the Exercise Price of a full share by the fraction of a share and 
round the result to the nearest cent.

     SECTION 4.  ASSIGNMENT OR LOSS OF WARRANT.

          (a)  Except as provided in Section 9, Holder shall be entitled, 
without obtaining the consent of the Company, to assign its interest in this 
Warrant in whole or in part to any person or persons.  Subject to the 
provisions of Section 9, upon surrender of this Warrant to the Company or at 
the office of its stock transfer agent or warrant agent, with the Assignment 
Form annexed hereto duly executed and funds sufficient to pay any transfer 
tax, the Company shall, without charge, execute and deliver a new Warrant or 
Warrants in the name of the assignee or assignees named in such instrument of 
assignment (any such assignee will then be a "Holder" for purposes of this 
Warrant) and, if Holder's entire interest is not being assigned, in the name 
of Holder, and this Warrant shall promptly be canceled.

          (b)  The Company shall issue a new Warrant in place of any 
previously issued  Warrant alleged to have been lost, stolen or destroyed, 
upon such terms and conditions as the Company's Board of Directors may 
prescribe, including the presentation of reasonable evidence of such loss, 
theft or destruction (provided that an affidavit of Holder will be 
satisfactory for

                                       2.

<PAGE>

such purpose) and the giving of such indemnity as the Company's Board of 
Directors may request for the protection of the Company or transfer agent or 
registrar (provided that the Holder's own indemnification agreement in form 
reasonably satisfactory to the Company shall under all circumstances be 
satisfactory, and no bond shall be required).  Upon surrender of any 
previously issued Warrant that has been mutilated, the Company shall issue a 
new Warrant in place thereof.

     SECTION 5.  RIGHTS OF HOLDER.  Holder shall not, by virtue hereof, be 
entitled to any rights of a stockholder in the Company, either at law or 
equity, and the rights of Holder are limited to those expressed in this 
Warrant. Nothing contained in this Warrant shall be construed as conferring 
upon Holder hereof the right to vote or to consent or to receive notice as a 
stockholder of the Company on any matters or with respect to any rights 
whatsoever as a stockholder of the Company.  No dividends or interest shall 
be payable or accrued in respect of this Warrant or the interest represented 
hereby or the Warrant Shares purchasable hereunder until, and only to the 
extent that, this Warrant shall have been exercised in accordance with its 
terms.

     SECTION 6.  ADJUSTMENT OF EXERCISE PRICE AND NUMBER OF SHARES.  The 
number and kind of securities purchasable upon the exercise of this Warrant 
and the Exercise Price shall be subject to adjustment from time to time upon 
the beginning of certain events, as follows:

          (a)  ADJUSTMENT FOR CHANGE IN CAPITAL STOCK.  If at any time after
December 13, 1996, the Company:

               (A)  pays a dividend or makes a distribution on its Common Stock
                    in shares of its Common Stock;

               (B)  subdivides its outstanding shares of Common Stock into a
                    greater number of shares;

               (C)  combines its outstanding shares of Common Stock into a
                    smaller number of shares;

               (D)  makes a distribution on its Common Stock in shares of its
                    capital stock other than Common Stock; or

               (E)  issues by reclassification of its Common Stock any shares of
                    its capital stock;

then the Exercise Price in effect immediately prior to such action shall be 
adjusted so that Holder may receive upon exercise of this Warrant and payment 
of the same aggregate consideration the number of shares of capital stock of 
the Company which Holder would have owned immediately following such action 
if Holder had exercised this Warrant immediately prior to such action.

                                       3.

<PAGE> 

    The adjustment shall become effective immediately after the record 
date in the case of a dividend or distribution and immediately after the 
effective date in the case of a subdivision, combination or reclassification.

          (b)  MINIMUM ADJUSTMENT.  No adjustment in the Exercise Price of 
this Section 6 shall be required unless such adjustment would require an 
increase or decrease of at least ($.05) in such Exercise Price; PROVIDED, 
HOWEVER, that any adjustments which by reason of this subsection are not 
required to be made, shall be carried forward and taken into account in any 
subsequent adjustment. All calculations under this Section 6 shall be made to 
the nearest cent or to the nearest share, as the case may be.

          (c)  DEFERRAL OF ISSUANCE OR PAYMENT.  In any case in which an 
event covered by this Section 6 shall require that an adjustment in the 
Exercise Price be made effective as of a record date, the Company may elect 
to defer until the occurrence of such event (i) issuing to Holder, if this 
Warrant is exercised after such record date, the shares of Common Stock and 
other capital stock of the Company, if any, issuable upon such exercise over 
and above the shares of Common Stock or other capital stock of the Company, 
if any, issuable upon such exercise on the basis of the Exercise Price in 
effect prior to such adjustment, and (ii) paying to Holder by check any 
amount in lieu of the issuance of fractional shares pursuant to Section 3.

          (d)  WHEN NO ADJUSTMENT REQUIRED.  No adjustment need be made for a 
change in the par value or no par value of the Common Stock.  To the extent 
this Warrant becomes exercisable into cash, no adjustment need be made 
thereafter as to the cash, and interest will not accrue on the cash.

          (e)  NOTICE OF CERTAIN ACTIONS.  In the event that:

               (A)  the Company shall authorize the issuance to all holders 
of its Common Stock of rights, warrants, options or convertible securities to 
subscribe for or purchase shares of its Common Stock or of any other 
subscription rights, warrants, options or convertible securities; or

               (B)  the Company shall authorize the distribution to all 
holders of its Common Stock of evidences of its indebtedness or assets (other 
than dividends paid in or distributions of the Company's capital stock for 
which the Exercise Price shall have been adjusted pursuant to subsection (a) 
of this Section 6 or cash dividends or cash distributions payable out of 
consolidated current or retained earnings as shown on the books of the 
Company and paid in the ordinary course of business); or

               (C)  the Company shall authorize any capital reorganization or
reclassification of the Common Stock (other than a subdivision or combination of
the outstanding Common Stock and other than a change in par value of the Common
Stock) or of any consolidation or merger to which the Company is a party and for
which approval of any stockholders of the Company is required (other than a
consolidation or merger in which the Company is the continuing corporation and
that does not result in any reclassification or change

                                        4.

<PAGE>

of the Common Stock outstanding), or of the conveyance or transfer of the 
properties and assets of the Company as an entirety or substantially as an 
entirety; or

               (D)  the Company is the subject of a voluntary or involuntary 
dissolution, liquidation or winding-up procedure; or

               (E)  the Company proposes to take any action (other than 
actions of the character described in subsection (a) of this Section 6) that 
would require an adjustment of the Exercise Price pursuant to this Section 6;

then the Company shall cause to be mailed by first-class mail to Holder, at 
least twenty (20) days prior to the applicable record or effective date 
hereinafter specified, a notice stating (x) the date as of which the holders 
of Common Stock of record to be entitled to receive any such rights, warrants 
or distributions are to be determined, or (y) the date on which any such 
consolidation, merger, conveyance, transfer, dissolution, liquidation or 
winding-up is expected to become effective, and the date as of which it is 
expected that holders of Common Stock of record shall be entitled to exchange 
their shares of Common Stock for securities or other property, if any, 
deliverable upon such reorganization, reclassification, consolidation, 
merger, conveyance, transfer, dissolution, liquidation or winding-up.

          (f)  NO ADJUSTMENT UPON EXERCISE OF WARRANT.  No adjustments shall 
be made under any Section herein in connection with the issuance of Warrant 
Shares after exercise of this Warrant.

     SECTION 7.  OFFICERS' CERTIFICATE.  Whenever the Exercise Price shall be 
adjusted as required by the provisions of Section 6, the Company shall 
forthwith file in the custody of its Secretary or an Assistant Secretary at 
its principal office an officers' certificate showing the adjusted Exercise 
Price determined as herein provided, setting forth in reasonable detail the 
facts requiring such adjustment and the manner of computing such adjustment.  
Each such officers' certificate shall be signed by the chairperson, president 
or chief financial officer of the Company and by the secretary or any 
assistant secretary of the Company.  Each such officers' certificate shall be 
made available at all reasonable times for inspection by Holder.

     SECTION 8.  RECLASSIFICATION, REORGANIZATION, CONSOLIDATION OR MERGER.  
In the event of any reclassification, capital reorganization or other change 
of outstanding shares of Common Stock of the Company (other than a 
subdivision or combination of the outstanding Common Stock and other than a 
change in the par value of the Common Stock) or in the event of any 
consolidation or merger of the Company with or into another corporation 
(other than a merger in which the Company is the continuing corporation and 
that does not result in any reclassification, capital reorganization or other 
change of outstanding shares of Common Stock of the class issuable upon 
exercise of this Warrant) or in the event of any sale, lease, transfer or 
conveyance to another corporation of the property and assets of the Company 
as an entirety or substantially as an entirety, the Company shall, as a 
condition precedent to such transaction, cause effective provisions to be 
made so that Holder shall have the right thereafter, by exercising this 
Warrant, to purchase the kind and amount of shares of stock and other 
securities and
                                       5.

<PAGE>

property (including cash) receivable upon such reclassification, capital 
reorganization and other change, consolidation, merger, sale or conveyance by 
a holder of the number of shares of Common Stock that might have been 
received upon exercise of this Warrant immediately prior to such 
reclassification, capital reorganization, change, consolidation, merger, sale 
or conveyance. Any such provision shall include provisions for adjustments in 
respect of such shares of stock and other securities and property that shall 
be as nearly equivalent as may be practicable to the adjustments provided for 
in this Warrant.  The foregoing provisions of this Section 8 shall similarly 
apply to successive reclassifications, capital reorganizations and changes of 
shares of Common Stock and to successive consolidations, mergers, sales or 
conveyances. In the event that in connection with any such capital 
reorganization, or reclassification, consolidation, merger, sale or 
conveyance, additional shares of Common Stock shall be issued in exchange, 
conversion, substitution or payment, in whole or in part, for, or of, a 
security of the Company other than Common Stock, any such issue shall be 
treated as an issue of Common Stock covered by the provisions of subsection 
(a) of Section 6.

     SECTION 9.  TRANSFER TO COMPLY WITH THE SECURITIES ACT OF 1933.  This 
Warrant may not be exercised and neither this Warrant nor any of the Warrant 
Shares, nor any interest in either, may be offered, sold, assigned, pledged, 
hypothecated, encumbered or in any other manner transferred or disposed of, 
in whole or in part, except in compliance with applicable United States 
federal and state securities or blue sky laws and the terms and conditions 
hereof.  Each Warrant shall bear a legend in substantially the same form as 
the legend set forth on the first page of this Warrant.  Each certificate for 
Warrant Shares issued upon exercise of this Warrant, unless at the time of 
exercise such Warrant Shares are acquired pursuant to a registration 
statement that has been declared effective under the Act and applicable blue 
sky laws, shall bear a legend substantially in the following form:

     THE SECURITIES REPRESENTED HEREBY HAVE NOT BEEN REGISTERED UNDER THE
     SECURITIES ACT OF 1933, AS AMENDED (THE "ACT"), OR UNDER THE
     SECURITIES LAWS OF ANY STATE.  THESE SECURITIES ARE SUBJECT TO
     RESTRICTIONS ON TRANSFERABILITY AND RESALE AND MAY NOT BE TRANSFERRED
     OR RESOLD EXCEPT AS PERMITTED UNDER THE ACT AND THE APPLICABLE STATE
     SECURITIES LAWS, PURSUANT TO REGISTRATION OR EXEMPTION THEREFROM.  THE
     ISSUER OF THESE SECURITIES MAY REQUIRE AN OPINION OF COUNSEL IN FORM
     AND SUBSTANCE SATISFACTORY TO THE ISSUER TO THE EFFECT THAT ANY
     PROPOSED TRANSFER OR RESALE IS IN COMPLIANCE WITH THE ACT AND ANY
     APPLICABLE STATE SECURITIES LAWS.

Any certificate for any Warrant Shares issued at any time in exchange or
substitution for any certificate for any Warrant Shares bearing such legend
(except a new certificate for any Warrant Shares issued after the acquisition of
such Warrant Shares pursuant to a registration statement that has been declared
effective under the Act) shall also bear such legend unless, in the opinion of
counsel for the Company, the Warrant Shares represented thereby need no longer
be subject to the restriction contained herein.  The provision of this Section 9
shall be binding upon all 

                                       6.

<PAGE>

subsequent holders of certificates for Warrant Shares bearing the above 
legend and all subsequent holders of this Warrant, if any.

     SECTION 10.  MODIFICATION AND WAIVER.  Neither this Warrant nor any term
hereof may be changed, waived, discharged or terminated other than by an
instrument in writing signed by the Company and by Holder.

     SECTION 11.  NOTICES.  All notices, requests, consents and other
communications hereunder shall be in writing, shall be sent by confirmed
facsimile or mailed by first-class registered or certified airmail, or
nationally recognized overnight express courier, postage prepaid, and shall be
deemed given when so sent and addressed as follows:

          (i)  if to the Company, to:

                    Biocircuits Corporation
                    1324 Chesapeake Terrace
                    Sunnyvale, California 94089
                    Attention: Donald B. Hawthorne
                               Chief Financial Officer
                    Facsimile No.:  (408) 752-8790

          with a copy so mailed to:

                    Cooley Godward LLP
                    Five Palo Alto Square
                    Palo Alto, California 94306-2155
                    Attention: Deborah A. Marshall, Esq.
                    Facsimile No.:  (415) 857-0663

          or to such other person at such other place as the Company shall
          designate to Purchaser in writing; and

          (ii) if to Purchaser, to:

                    Beckman Instruments, Inc.
                    2500 Harbor Boulevard
                    Fullerton, California 92834-3100
                    Attention:  Treasurer
                    Facsimile No.:  (714) 773-8111

          with a copy so mailed to the General Counsel of Beckman Instruments,
          Inc. at the above address or at such other address or addresses as may
          have been furnished to the Company in writing.

                                       7.

<PAGE>

     SECTION 12.  DESCRIPTIVE HEADINGS AND GOVERNING LAW.  The description
headings of the several sections and paragraphs of this Warrant are inserted for
convenience only and do not constitute a part of this Warrant.  This Warrant
shall be construed and enforced in accordance with, and the rights of the
parties shall be governed by, the laws of the State of California, without
regard to its conflicts of laws principles.

     IN WITNESS WHEREOF, the Company has duly caused this Warrant to be signed
by its duly authorized officer and to be dated as of December 13, 1996.


                         BIOCIRCUITS CORPORATION


                         By:
                            ---------------------------------------
                              John Kaiser
                              Chief Executive Officer


                                       8.

<PAGE>
                             PURCHASE FORM


                                                    Dated December 13, 1996


     The undersigned hereby irrevocably elects to exercise the within 
Warrant, No. 1996-B1, to purchase ________ shares of Common Stock and hereby 
makes payment of $______ in payment of the exercise price thereof.

                                   BECKMAN INSTRUMENTS, INC.



                                   By:
                                      -------------------------------------
                                       Louis T. Rosso
                                       Chief Executive Officer


<PAGE>

                                 ASSIGNMENT FORM


                                                         Dated _________, 19____



     FOR VALUE RECEIVED, Beckman Instruments, Inc. hereby sells, assigns and
transfers unto ______________________________________________ (the "Assignee"),
                   (please type or print in block letters)

_______________________________________________________________________________
                       (insert address)
its right to purchase up to _______ shares of Common Stock represented by this
Warrant, No. 1996-B1, and does hereby irrevocably constitute and appoint
____________________________  attorney, to transfer the same on the books of the
Company, with full power of substitution in the premises.


                                   BECKMAN INSTRUMENTS, INC.



                                   By:
                                      ------------------------------------
                                       Louis T. Rosso
                                       Chief Executive Officer




<PAGE>

                                   EXHIBIT 4.6

                  [Form of Warrant Issued to KMC Systems, Inc.]

THE SECURITIES REPRESENTED HEREBY HAVE NOT BEEN REGISTERED UNDER THE SECURITIES
ACT OF 1933, AS AMENDED (THE "ACT"), OR UNDER THE SECURITIES LAWS OF ANY STATE. 
THESE SECURITIES ARE SUBJECT TO RESTRICTIONS ON TRANSFERABILITY AND RESALE AND
MAY NOT BE TRANSFERRED OR RESOLD EXCEPT AS PERMITTED UNDER THE ACT AND THE
APPLICABLE STATE SECURITIES LAWS, PURSUANT TO REGISTRATION OR EXEMPTION
THEREFROM.  THE ISSUER OF THESE SECURITIES MAY REQUIRE AN OPINION OF COUNSEL IN
FORM AND SUBSTANCE SATISFACTORY TO THE ISSUER TO THE EFFECT THAT ANY PROPOSED
TRANSFER OR RESALE IS IN COMPLIANCE WITH THE ACT AND ANY APPLICABLE STATE
SECURITIES LAWS.


                             BIOCIRCUITS CORPORATION

               WARRANT FOR THE PURCHASE OF SHARES OF COMMON STOCK


No. 1996-K1                                                     250,000 Shares


     FOR VALUE RECEIVED, BIOCIRCUITS CORPORATION, a Delaware corporation (the
"Company"), with its principal office at 1324 Chesapeake Terrace, Sunnyvale,
California 94089, hereby certifies that KMC Systems, Inc. ("Kollsman" or
alternatively, "Holder"), or its assigns, in consideration for Kollsman's
commitment to manufacture all of the Company's United States' requirements of
IOS instruments ordered before 5:00 p.m (Pacific Standard Time) December 31,
1997 is entitled, subject to the provisions of this Warrant, to purchase from
the Company, at any time before 5:00 p.m. (Pacific Standard Time) June 30, 1998
(the "Expiration Date"), the number of fully paid and nonassessable shares of
Common Stock of the Company set forth above, subject to adjustment as
hereinafter provided.  The term "Common Stock" shall mean the aforementioned
Common Stock of the Company, together with any other equity securities that may
be issued by the Company in addition thereto or in substitution therefor as
provided herein.  The shares of Common Stock deliverable upon such exercise, as
adjusted from time to time, are hereinafter referred to as "Warrant Shares."

     SECTION 1.  EXERCISE OF WARRANT.  Holder may purchase said number of
Warrant Shares at a purchase price per share of seven dollars ($7.00) per share
(the "Exercise Price").  This Warrant may be exercised in whole or in part on
any business day prior to the Expiration Date by presentation and surrender
hereof to the Company at its principal office at the address set forth in the
initial paragraph hereof (or at such other address as the Company may hereafter
notify Holder in writing) with the Purchase Form annexed hereto duly executed
and accompanied by proper payment of the Exercise Price in lawful money of the
United States of America in the 


                                       1.

<PAGE>

form of a check, subject to collection, for the number of Warrant Shares 
specified in the Purchase Form.  

     If this Warrant should be exercised in part only, the Company shall, upon
surrender of this Warrant, execute and deliver a new warrant evidencing the
rights of Holder thereof to purchase the balance of the Warrant Shares
purchasable hereunder.  Upon receipt by the Company of this Warrant and such
Purchase Form, together with proper payment of the Exercise Price, at such
office, Holder shall be deemed to be the holder of record of the Warrant Shares,
notwithstanding that the stock transfer books of the Company shall then be
closed or that certificates representing such Warrant Shares shall not then be
actually delivered to Holder.  The Company shall pay any and all documentary
stamp or similar issue or transfer taxes payable in respect of the issue or
delivery of the Warrant Shares.

     In addition to and without limiting the rights of Holder under any other
terms set forth herein, Holder shall have the right, upon written request by
Holder delivered or transmitted to the Company together with this Warrant, to
exchange this Warrant, in whole or in part at any time on or before the
Expiration Date, for the number of shares of Common Stock of the Company having
an aggregate current market price on the date of such exchange (determined as
provided in Section 6(b)) equal to the difference between (a) the aggregate
current market value on the date of such exchange (determined as aforesaid) of a
number of Warrant Shares designated by Holder, and (b) the aggregate Exercise
Price Holder would have paid to the Company to purchase such designated number
of Warrant Shares upon exercise of this Warrant.  Upon such exchange, the number
of Warrant Shares purchasable upon exercise of this Warrant shall be reduced by
such designated number of Warrant Shares and, if a balance of purchasable
Warrant Shares remains after such exchange, the Company shall execute and
deliver to Holder a new warrant evidencing the right to purchase such balance of
Warrant Shares; PROVIDED, that no fractional shares shall be issuable upon such
exchange, and if the number of shares of Common Stock determined in accordance
with the foregoing formula is other than a whole number, the Company shall pay
Holder an amount by check, determined in accordance with the provisions of
Section 3.

     SECTION 2.  RESERVATION OF SHARES.  The Company hereby agrees that at all
times there shall be reserved for issuance and delivery upon exercise of this
Warrant all shares of its Common Stock or other shares of capital stock of the
Company from time to time issuable upon exercise of this Warrant.  All such
shares shall be duly authorized and, when issued upon such exercise in
accordance with the terms of this Warrant, shall be validly issued, fully paid
and nonassessable, free and clear of all liens, security interests, charges and
other encumbrances or restrictions on sale (other than as provided in the
Company's certificate of incorporation and any restrictions on sale set forth
herein or pursuant to applicable federal and state securities laws) and free and
clear of all preemptive rights.

     SECTION 3.  FRACTIONAL INTEREST.  The Company will not issue a fractional
share of Common Stock upon exercise of a Warrant.  Instead, the Company will
deliver its check for the current market value of the fractional share.  The
current market value of a fraction of a share is determined as follows: multiply
the current market price of a full share by the fraction of a 

                                       2.

<PAGE>

share and round the result to the nearest cent.  The current market price of 
a share of Common Stock for purposes of this Section 3 is the Quoted Price 
(as defined in Section 6(b)) of the Common Stock on the last trading day 
prior to the exercise date.

     SECTION 4.  ASSIGNMENT OR LOSS OF WARRANT.

          (a)  Subject to the provisions of Section 8, Holder shall be entitled,
without obtaining the consent of the Company, to assign its interest in this
Warrant in whole or in part to any person or persons.  Subject to the provisions
of Section 8, upon surrender of this Warrant to the Company or at the office of
its stock transfer agent or warrant agent, with the Assignment Form annexed
hereto duly executed and funds sufficient to pay any transfer tax, the Company
shall, without charge, execute and deliver a new Warrant or Warrants in the name
of the assignee or assignees named in such instrument of assignment (any such
assignee will also be a "Holder" for purposes of this Warrant) and, if Holder's
entire interest is not being assigned, in the name of Holder, and this Warrant
shall promptly be canceled.

          (b)  Upon receipt of evidence satisfactory to the Company of the loss,
theft, destruction or mutilation of this Warrant, and (in the case of loss,
theft or destruction) of indemnification satisfactory to the Company, and upon
surrender and cancellation of this Warrant, if mutilated, the Company shall
execute and deliver a new Warrant of like tenor and date.

     SECTION 5.  RIGHTS OF HOLDER.  Holder shall not, by virtue hereof, be
entitled to any rights of a stockholder in the Company, either at law or equity,
and the rights of Holder are limited to those expressed in this Warrant. 
Nothing contained in this Warrant shall be construed as conferring upon Holder
hereof the right to vote or to consent or to receive notice as a stockholder of
the Company on any matters or with respect to any rights whatsoever as a
stockholder of the Company.  No dividends or interest shall be payable or
accrued in respect of this Warrant or the interest represented hereby or the
Warrant Shares purchasable hereunder until, and only to the extent that, this
Warrant shall have been exercised in accordance with its terms.

     SECTION 6.  ADJUSTMENT OF NUMBER OF SHARES AND EXPIRATION DATE:  The number
and kind of securities purchasable upon the exercise of this Warrant shall be
subject to adjustment from time to time upon the occurrence of certain events,
as follows:

          (a)  ADJUSTMENT FOR CHANGE IN CAPITAL STOCK.  If at any time after
___________ ___, 1996, the Company:

               (i)  pays a dividend or makes a distribution on its Common Stock
                    in shares of its Common Stock;

               (ii) subdivides its outstanding shares of Common Stock into a
                    greater number of shares;

                                       3.

<PAGE>

             (iii)  combines its outstanding shares of Common Stock into a
                    smaller number of shares;

             (iv)   makes a distribution on its Common Stock in shares of its
                    capital stock other than Common Stock; or

             (v)    issues by reclassification of its Common Stock any shares of
                    its capital stock;

then the Exercise Price in effect immediately prior to such action shall be
adjusted so that Holder may receive upon exercise of this Warrant and payment of
the same aggregate consideration the number of shares of capital stock of the
Company which Holder would have owned immediately following such action if
Holder had exercised this Warrant immediately prior to such action.

     The adjustment shall become effective immediately after the record date in
the case of a dividend or distribution and immediately after the effective date
in the case of a subdivision, combination or reclassification.

          (b)  ADJUSTMENTS DEPENDENT UPON THE MARKET PRICE OF THE COMMON STOCK. 
The market price per share of Common Stock is the average of the Quoted Prices
of the Common Stock for the 10 consecutive trading days commencing before June
30, 1998.  The "Quoted Price" of the Common Stock is the last reported sales
price of the Common Stock as reported by the Nasdaq National Market, or the
primary national securities exchange on which the Common Stock is then quoted;
provided, however, that if the Common Stock is neither traded on the Nasdaq
National Market nor on a national securities exchange, the price referred to
above shall be the price reflected on the Nasdaq National Market, or if the
Common Stock is not then traded on the Nasdaq National Market, the price
reflected in the over-the counter market as reported by the National Quotation
Bureau, Inc. or any organization performing a similar function.

               (i)  If the market price per share of Common Stock is less 
than $14.00 per share but greater than $10.00 per share for the 10 
consecutive trading day period prior to June 13, 1998, the Expiration Date of 
this Warrant shall be extended to June 30, 1999.

               (ii) If the market price per share of Common Stock is less 
than $10.00 per share for the 10 consecutive trading day period prior to June 
13, 1998, the Expiration Date of this Warrant shall be extended to June 30, 
1999.  In addition, Biocircuits shall issue on July 1, 1998 a warrant for 
50,000 shares of Common Stock with an exercise price equal to the then market 
price and an expiration date of June 30, 1999.  For the purpose of the 
additional 50,000 shares, the "then market price" is the average closing 
price of the 10 trading days prior to July 1, 1998.

          (c)  ADJUSTMENT DEPENDENT UPON REGULATORY APPROVAL AND PRODUCT 
LAUNCH. In April 1, 1996, the Company filed a 510(k) pre-market notification 
with the United States Food and Drug Administration ("FDA") for a Thyroid 
Stimulating Hormone ("TSH") assay.  If the TSH assay is not cleared by the 
FDA and launched by the Company on or before 

                                       4.

<PAGE>

January 31, 1997, then the expiration date of this warrant shall be extended 
by six months 180 days and all the dates in 6(b)(i) and (ii) shall be 
extended by 180 days.

          (d)  WHEN NO ADJUSTMENT REQUIRED.  If the market price of the Common
Stock is $14.00 per share or greater for the 15 day period prior to December 15,
1997, no adjustment with respect to Subsection 6(b) need be made.

          (e)  NOTICE OF CERTAIN ACTIONS.  In the event that:

               (i)  the Company shall authorize the issuance to all holders of
its Common Stock of rights, warrants, options or convertible securities to
subscribe for or purchase shares of its Common Stock or of any other
subscription rights, warrants, options or convertible securities; or

               (ii) the Company shall authorize the distribution to all holders
of its Common Stock of evidences of its indebtedness or assets (other than cash
dividends or cash distributions payable out of consolidated current or retained
earnings as shown on the books of the Company and paid in the ordinary course of
business); or

               (iii) the Company shall authorize any capital reorganization
or reclassification of the Common Stock (other than a subdivision or combination
of the outstanding Common Stock and other than a change in par value of the
Common Stock) or of any consolidation or merger to which the Company is a party
and for which approval of any stockholders of the Company is required (other
than a consolidation or merger in which the Company is the continuing
corporation and that does not result in any reclassification or change of the
Common Stock outstanding), or of the conveyance or transfer of the properties
and assets of the Company as an entirety or substantially as an entirety; or

               (iv) the Company is the subject of a voluntary or involuntary
dissolution, liquidation or winding-up procedure; or

               (v)  the Company proposes to take any action that would require
an adjustment of the Exercise Price;

then the Company shall cause to be mailed by first-class mail to Holder, at
least twenty (20) days prior to the applicable record or effective date
hereinafter specified, a notice stating (x) the date as of which the holders of
Common Stock of record to be entitled to receive any such rights, warrants or
distributions are to be determined, or (y) the date on which any such
consolidation, merger, conveyance, transfer, dissolution, liquidation or
winding-up is expected to become effective, and the date as of which it is
expected that holders of Common Stock of record shall be entitled to exchange
their shares of Common Stock for securities or other property, if any,
deliverable upon such reorganization, reclassification, consolidation, merger,
conveyance, transfer, dissolution, liquidation or winding-up.


                                       5.

<PAGE>

          (f)  NO ADJUSTMENT UPON EXERCISE OF WARRANT.  No adjustments shall be
made under any Section herein in connection with the issuance of Warrant Shares
upon exercise of this Warrant.

     SECTION 7.  RECLASSIFICATION, REORGANIZATION, CONSOLIDATION OR MERGER.  
In the event of any reclassification, capital reorganization or other change 
of outstanding shares of Common Stock of the Company (other than a 
subdivision or combination of the outstanding Common Stock and other than a 
change in the par value of the Common Stock) or in the event of any 
consolidation or merger of the Company with or into another corporation 
(other than a merger in which the Company is the continuing corporation and 
that does not result in any reclassification, capital reorganization or other 
change of outstanding shares of Common Stock of the class issuable upon 
exercise of this Warrant) or in the event of any sale, lease, transfer or 
conveyance to another corporation of the property and assets of the Company 
as an entirety or substantially as an entirety, the Company shall, as a 
condition precedent to such transaction, cause effective provisions to be 
made so that Holder shall have the right thereafter, by exercising this 
Warrant, to purchase the kind and amount of shares of stock and other 
securities and property (including cash) receivable upon such 
reclassification, capital reorganization and other change, consolidation, 
merger, sale or conveyance by a holder of the number of shares of Common 
Stock that might have been received upon exercise of this Warrant immediately 
prior to such reclassification, capital reorganization, change, 
consolidation, merger, sale or conveyance. Any such provision shall include 
provisions for adjustments in respect of such shares of stock and other 
securities and property that shall be as nearly equivalent as may be 
practicable to the adjustments provided for in this Warrant.  The foregoing 
provisions of this Section 7 shall similarly apply to successive 
reclassifications, capital reorganizations and changes of shares of Common 
Stock and to successive consolidations, mergers, sales or conveyances. 

     SECTION 8.  TRANSFER TO COMPLY WITH THE SECURITIES ACT OF 1933.  This 
Warrant may not be exercised and neither this Warrant nor any of the Warrant 
Shares, nor any interest in either, may be offered, sold, assigned, pledged, 
hypothecated, encumbered or in any other manner transferred or disposed of, 
in whole or in part, except in compliance with applicable United States 
federal and state securities or Blue Sky laws and the terms and conditions 
hereof.  Each subsequent Warrant shall bear a legend in substantially the 
same form as the legend set forth on the first page of this Warrant.  Each 
certificate for Warrant Shares issued upon exercise of this Warrant and 
subsequent Warrants, unless at the time of exercise such Warrant Shares are 
acquired pursuant to a registration statement that has been declared 
effective under the Act, and applicable Blue Sky laws shall bear a legend 
substantially in the following form:

     THE SECURITIES REPRESENTED HEREBY HAVE NOT BEEN REGISTERED UNDER THE
     SECURITIES ACT OF 1933, AS AMENDED (THE "ACT"), OR UNDER THE
     SECURITIES LAWS OF ANY STATE.  THESE SECURITIES ARE SUBJECT TO
     RESTRICTIONS ON TRANSFERABILITY AND RESALE AND MAY NOT BE TRANSFERRED
     OR RESOLD EXCEPT AS PERMITTED UNDER THE ACT AND THE APPLICABLE STATE
     SECURITIES LAWS, PURSUANT TO REGISTRATION OR EXEMPTION THEREFROM.  THE
     ISSUER OF THESE SECURITIES 


                                       6.

<PAGE>

     MAY REQUIRE AN OPINION OF COUNSEL IN FORM AND SUBSTANCE SATISFACTORY 
     TO THE ISSUER TO THE EFFECT THAT ANY PROPOSED TRANSFER OR RESALE 
     IS IN COMPLIANCE WITH THE ACT AND ANY APPLICABLE STATE SECURITIES LAWS.

Any certificate for any Warrant Shares issued at any time in exchange or
substitution for any certificate for any Warrant Shares bearing such legend
(except a new certificate for any Warrant Shares issued after the acquisition of
such Warrant Shares pursuant to a registration statement that has been declared
effective under the Act) shall also bear such legend unless, in the opinion of
counsel for the Company, the Warrant Shares represented thereby need no longer
be subject to the restriction contained herein.  The provision of this Section 8
shall be binding upon all subsequent holders of certificates for Warrant Shares
bearing the above legend and all subsequent Holders of this Warrant and new
warrants (as provided in Section 1), if any.

     SECTION 9.  REGISTRATION RIGHTS.

          (a)  If at any time after the date hereof and prior to the Expiration
Date, the Company shall determine to register any of its Common Stock, for its
own account or for the account of others on a registration statement on Form S-1
or Form S-3, the Company shall:

               (i)  promptly give Holder written notice thereof (which shall
include a list of the jurisdictions in which the Company intends to attempt to
qualify such securities under the applicable blue sky or other state
securities); and

               (ii) include in such registration (and any related qualification
under blue sky laws or other compliance), and in any underwriting involved
therein, all shares of Common Stock of the Company obtained upon exercise of
this Warrant (the "Registrable Securities") specified in a written request or
requests by Holder, received by the Company within twenty (20) days after such
written notice is given, requesting inclusions in such registration.

          (b)  UNDERWRITING.  If the registration of which the Company gives
notice is for a registered public offering involving an underwriting, the
Company shall so advise Holder as a part of the written notice given pursuant to
Paragraph 9(a)(i).  In such event, the right of Holder to registration pursuant
to this Section 9 shall be conditioned upon Holder's participation in such
underwriting and the inclusion of Holder's Registrable Securities in the
underwriting to the extent provided herein.

          Holder shall (together with the Company and the other holders
distributing their securities through such underwriting) enter into an
underwriting agreement in customary form with the underwriter or underwriters
selected for such underwriting by the Company.  Notwithstanding any other
provision of this Section 9, if the underwriter determines that marketing
factors require a limitation of the number of shares to be underwritten, the
underwriter may exclude some or all of the Registrable Securities from such
registration and underwriting.


                                       7.

<PAGE>

          If Holder disapproves of the terms of any such underwriting, Holder
may select to withdraw therefrom by written notice to the Company and the
underwriter.  Any Registrable Securities so withdrawn from such underwriting
shall also be withdrawn from such registration.

          (c)  The Company shall bear registration expenses (exclusive of
underwriting discounts and commissions) for the Form S-1 or Form S-3
registration.

          (d)  If requested by the underwriters, Holder, or any assignee of
Holder, shall not sell or otherwise transfer or dispose of any securities of the
Company held by Holder for a period of up to 180 days following a public
offering by the Company of its capital stock.

          (e)  (i)  The Company will indemnify Holder, each of Holder's
officers, directors, partners and agents, and each person controlling Holder,
with respect to such registration, qualification or compliance that has been
effected pursuant to this Section 9, and each underwriter, if any, and each
person who controls any underwriter against all claims, losses, damages and
liabilities (or actions in respect thereof) including any of the foregoing
incurred in settlement of any litigation commenced or threatened arising out of
or based on (x) any untrue statement (or alleged untrue statement) of a material
fact contained in any prospectus, offering circular or other similar document
(including any related registration statement, notification or the like)
incident to any such registration, qualification or compliance, or based on any
omission (or alleged omission) to state therein a material fact required to be
stated therein or necessary to make the statements therein not misleading in the
light of the circumstances under which they were made, or (y) any violation (or
alleged violation) by the Company of any federal, state or common law rule or
regulation applicable to the Company in connection with any such registration,
qualification or compliance, and will reimburse Holder, each of its officers,
directors, partners and agents, and each person controlling Holder, each such
underwriter and each person who controls any such underwriter, for any legal and
any other expenses reasonably incurred in connection with investigating or
defending any such claim, loss, damage, liability or action, as incurred,
provided that the Company will not be liable in any such case to the extent that
any such claim, loss, damage, liability or expense arises out of or is based on
any untrue statement (or alleged untrue statement) or omission (or alleged
omission) based upon written information furnished to the Company by an
instrument duly executed by Holder or such underwriter and stated to be
specifically for use therein.

               (ii) Holder shall, if Registrable Securities held by Holder are
included in the securities as to which such registration, qualification or
compliance is being effected, indemnify the Company, each of its directors and
officers, each legal counsel and independent accountant of the Company, each
underwriter, if any, of the Company's securities covered by such a registration
statement, each person who controls the Company or such underwriter within the
meaning of the Securities Act, and each other such holder, each of its
directors, officers, and partners and agents and each person controlling such
other holder, against all claims, losses, damages and liabilities (or actions in
respect thereof) including any of the foregoing incurred in settlement of any
litigation commenced or threatened arising out of or based on any untrue
statement (or alleged untrue statement) of a material fact contained in any such
registration statement, prospectus, offering circular or other similar document
(including any related 


                                       8.

<PAGE>

registration statement, notification or the like) incident to any such 
registration, qualification or compliance, or any omission (or alleged 
omission) to state therein a material fact required to be stated therein or 
necessary to make the statements therein not misleading in the light of the 
circumstances under which they were made, and shall reimburse the Company, 
its directors, officers, legal counsel, accountants, underwriters, control 
persons and such other holders and each such holder's directors, officers, 
partners, agents and control persons for any legal and any other expenses 
reasonably incurred in connection with investigating or defending any such 
claim, loss, damage, liability or action, as incurred, in each case to the 
extent, but only to the extent, that such untrue statement (or alleged untrue 
statement) or omission (or alleged omission) is made in such registration 
statement, prospectus, offering circular or other document in reliance upon 
and in conformity with written information furnished to the Company by an 
instrument duly executed by Holder and stated to be specifically for use 
therein; provided, however, that the obligations of Holder hereunder shall be 
limited to an amount equal to the proceeds to Holder for Registrable 
Securities sold as contemplated herein.

               (iii) Each party entitled to indemnification under this
Subsection 9(e) (the "Indemnified Party") shall give notice to the party
required to provide indemnification (the "Indemnifying Party") promptly after
such Indemnified Party has received written notice of any claim as to which
indemnity may be sought, and shall permit the Indemnifying Party to assume the
defense of any such claim or any litigation resulting therefrom, provided that
counsel for the Indemnifying Party, who shall conduct the defense of such claim
or litigation, shall be approved by the Indemnified Party (whose approval shall
not unreasonably be withheld).  The Indemnified Party may participate in such
defense at the Indemnified Party's expense; provided, however, that the
Indemnifying Party shall bear the expense of such defense of the Indemnified
Party if representation of both parties by the same counsel would be
inappropriate due to actual or potential conflicts of interest.  The failure of
any Indemnified Party to give notice as provided herein shall relieve the
Indemnifying Party of its obligations under this Subsection 9(e) only to the
extent that such failure to give notice shall materially adversely prejudice the
Indemnifying Party in the defense of any such claim or any such litigation.  No
Indemnifying Party, in the defense of any such claim or litigation, shall,
except with the consent of each Indemnified Party, consent to entry of any
judgment or enter into any settlement which does not include as an unconditional
term thereof the giving by the claimant or plaintiff to such Indemnified Party
of a release from all liability in respect to such claim or litigation.

     SECTION 10.  MODIFICATION AND WAIVER.  Neither this Warrant nor any term
hereof may be changed, waived, discharged or terminated other than by an
instrument in writing signed by the Company and by Holder.

     SECTION 11.  NOTICES.  Any notice, request or other document required or
permitted to be given or delivered to Holder or the Company shall be delivered
or shall be sent by certified mail, postage prepaid, to Holder at its address as
shown on the books of the Company or to the Company at the address indicated
therefor in the first paragraph of this Warrant.

     SECTION 12.  DESCRIPTIVE HEADINGS AND GOVERNING LAW.  The description
headings of the several Sections, Subsections and Paragraphs of this Warrant are
inserted for convenience 


                                       9.

<PAGE>

only and do not constitute a part of this Warrant. This Warrant shall be 
construed and enforced in accordance with, and the rights of the parties 
shall be governed by, the laws of the State of California, without regard to 
its conflicts of laws principles.

     IN WITNESS WHEREOF, the Company has duly caused this Warrant to be signed
by its duly authorized officer and to be dated as of ____________, 1996.


                         ____________, 1996.

                         BIOCIRCUITS CORPORATION


                         By:                     
                            ----------------------------------
                              Donald B. Hawthorne
                              Chief Financial Officer


                                       10.

<PAGE>



                                  PURCHASE FORM


                                                       Dated ___________, 19____


     The undersigned hereby irrevocably elects to exercise the within Warrant
No. 1996-K1 to purchase ________ shares of Common Stock of Biocircuits
Corporation and hereby makes payment of $_____________ in payment of the
exercise price thereof.


                                   KMC SYSTEMS, INC.


                                   By:
                                      ----------------------------------

                                   Print Name:
                                              --------------------------

                                   Title:
                                         --------------------------------



<PAGE>

                                 ASSIGNMENT FORM


                                                   Dated _________, 19____



     FOR VALUE RECEIVED, KMC Systems, Inc. hereby sells, assigns and 
transfers unto __________________________________________________ (the 
"Assignee"),        (please type or print in block letters)

____________________________________________________________________________  
                      (insert address) its right to purchase up to _______ 
shares of Common Stock of Biocircuits Corporation represented by Biocircuits 
Corporation Warrant No. 1996-K-1 and does hereby irrevocably constitute and 
appoint ____________________________ attorney, to transfer the same on the 
books of Biocircuits Corporation, with full power of substitution in the 
premises.

                                   KMC SYSTEMS, INC.

                                   By:
                                      ----------------------------------

                                   Print Name:
                                              --------------------------

                                   Title:
                                         --------------------------------




<PAGE>

                                  EXHIBIT 4.7

                   [Form of Warrant Issued to Venture Lending]

THE SECURITIES REPRESENTED HEREBY HAVE NOT BEEN REGISTERED UNDER THE 
SECURITIES ACT OF 1933, AS AMENDED (THE "ACT"), OR UNDER THE SECURITIES LAWS 
OF ANY STATE. THESE SECURITIES ARE SUBJECT TO RESTRICTIONS ON TRANSFERABILITY 
AND RESALE AND MAY NOT BE TRANSFERRED OR RESOLD EXCEPT AS PERMITTED UNDER THE 
ACT AND THE APPLICABLE STATE SECURITIES LAWS, PURSUANT TO REGISTRATION OR 
EXEMPTION THEREFROM.  THE ISSUER OF THESE SECURITIES MAY REQUIRE AN OPINION 
OF COUNSEL IN FORM AND SUBSTANCE SATISFACTORY TO THE ISSUER TO THE EFFECT 
THAT ANY PROPOSED TRANSFER OR RESALE IS IN COMPLIANCE WITH THE ACT AND ANY 
APPLICABLE STATE SECURITIES LAWS.

                             BIOCIRCUITS CORPORATION

               WARRANT FOR THE PURCHASE OF SHARES OF COMMON STOCK


No. 1996-___                                                        4,605 Shares


     FOR VALUE RECEIVED, BIOCIRCUITS CORPORATION, a Delaware corporation (the 
"Company"), with its principal office at 1324 Chesapeake Terrace, Sunnyvale, 
California 94089, hereby certifies that Venture Lending, a division of 
Cupertino National Bank & Trust Company ("Holder"), or its assigns, in 
consideration for a loan and other financial accommodations, is entitled, 
subject to the provisions of this Warrant, to purchase from the Company, at 
any time before 5:00 p.m. (Pacific Standard Time) November 1, 2006 (the 
"Expiration Date"), the number of fully paid and nonassessable shares of 
Common Stock of the Company set forth above, subject to adjustment as 
hereinafter provided.

     Holder may purchase such number of shares of Common Stock at a purchase 
price per share (as appropriately adjusted pursuant to Section 6 hereof) of 
seventy percent (70%) of the closing price per share of the Company's Common 
Stock as quoted on the Nasdaq National Market System or on the primary 
national securities exchange on which the Common Stock is then listed, 
whichever is applicable, as published in the Western Edition of THE WALL 
STREET JOURNAL (or, if not so reported, as otherwise reported by the Nasdaq 
National Market System) on the day immediately prior to the date of exercise 
(the "Exercise Price"). The term "Common Stock" shall mean the aforementioned 
Common Stock of the Company, together with any other equity securities that 
may be issued by the Company in addition thereto or in substitution therefor 
as provided herein.

     The number of shares of Common Stock to be received upon the exercise of 
this Warrant and the price to be paid for a share of Common Stock are subject 
to adjustment from time to time as hereinafter set forth.  The shares of 
Common Stock deliverable upon such exercise, as adjusted from time to time, 
are hereinafter sometimes referred to as "Warrant Shares."                    

                                     1.

<PAGE>

     SECTION 1.  EXERCISE OF WARRANT.  This Warrant may be exercised in whole 
or in part on any business day prior to the Expiration Date by presentation 
and surrender hereof to the Company at its principal office at the address 
set forth in the initial paragraph hereof (or at such other address as the 
Company may hereafter notify Holder in writing) with the Purchase Form 
annexed hereto duly executed and accompanied by proper payment of the 
Exercise Price in lawful money of the United States of America in the form of 
a check, subject to collection, for the number of Warrant Shares specified in 
the Purchase Form.  If this Warrant should be exercised in part only, the 
Company shall, upon surrender of this Warrant, execute and deliver a new 
Warrant evidencing the rights of Holder thereof to purchase the balance of 
the Warrant Shares purchasable hereunder. Upon receipt by the Company of this 
Warrant and such Purchase Form, together with proper payment of the Exercise 
Price, at such office, Holder shall be deemed to be the holder of record of 
the Warrant Shares, notwithstanding that the stock transfer books of the 
Company shall then be closed or that certificates representing such Warrant 
Shares shall not then be actually delivered to Holder.  The Company shall pay 
any and all documentary stamp or similar issue or transfer taxes payable in 
respect of the issue or delivery of the Warrant Shares.

     In addition to and without limiting the rights of Holder under any other 
terms set forth herein, Holder shall have the right, upon written request by 
Holder delivered or transmitted to the Company together with this Warrant, to 
exchange this Warrant, in whole or in part at any time after the Exercise 
Date and on or before the Expiration Date, for the number of shares of Common 
Stock of the Company having an aggregate current market price on the date of 
such exchange (determined as provided in Section 6(b) below) equal to the 
difference between (a) the aggregate current market value on the date of such 
exchange (determined as aforesaid) of a number of Warrant Shares designated 
by Holder, and (b) the aggregate Exercise Price Holder would have paid to the 
Company to purchase such designated number of Warrant Shares upon exercise of 
this Warrant. Upon such exchange, the number of Warrant Shares purchasable 
upon exercise of this Warrant shall be reduced by such designated number of 
Warrant Shares and, if a balance of purchasable Warrant Shares remains after 
such exchange, the Company shall execute and deliver to Holder a new Warrant 
evidencing the right to purchase such balance of Warrant Shares; PROVIDED, 
that no fractional shares shall be issuable upon such exchange, and if the 
number of shares of Common Stock determined in accordance with the foregoing 
formula is other than a whole number, the Company shall pay Holder an amount 
by check, determined in accordance with the provisions of Section 3.

     SECTION 2.  RESERVATION OF SHARES.  The Company hereby agrees that at 
all times there shall be reserved for issuance and delivery upon exercise of 
this Warrant all shares of its Common Stock or other shares of capital stock 
of the Company from time to time issuable upon exercise of this Warrant.  All 
such shares shall be duly authorized and, when issued upon such exercise in 
accordance with the terms of this Warrant, shall be validly issued, fully 
paid and nonassessable, free and clear of all liens, security interests, 
charges and other encumbrances or restrictions on sale (other than as 
provided in the Company's certificate of incorporation and any restrictions 
on sale set forth herein or pursuant to applicable federal and state 
securities laws) and free and clear of all preemptive rights.                 
                                  2.

<PAGE>

     SECTION 3.  FRACTIONAL INTEREST.  The Company will not issue a 
fractional share of Common Stock upon exercise of a Warrant.  Instead, the 
Company will deliver its check for the current market value of the fractional 
share.  The current market value of a fraction of a share is determined as 
follows: multiply the current market price of a full share by the fraction of 
a share and round the result to the nearest cent.

     The current market price of a share of Common Stock for purposes of this 
Section is the Quoted Price (as defined in Section 6(b) below) of the Common 
Stock on the last trading day prior to the exercise date.

     SECTION 4.  ASSIGNMENT OR LOSS OF WARRANT.

          (a)  Except as provided in Section 9, Holder shall be entitled, 
without obtaining the consent of the Company, to assign its interest in this 
Warrant in whole or in part to any person or persons.  Subject to the 
provisions of Section 9, upon surrender of this Warrant to the Company or at 
the office of its stock transfer agent or warrant agent, with the Assignment 
Form annexed hereto duly executed and funds sufficient to pay any transfer 
tax, the Company shall, without charge, execute and deliver a new Warrant or 
Warrants in the name of the assignee or assignees named in such instrument of 
assignment (any such assignee will then be a "Holder" for purposes of this 
Warrant) and, if Holder's entire interest is not being assigned, in the name 
of Holder, and this Warrant shall promptly be canceled.

          (b)  Upon receipt of evidence satisfactory to the Company of the 
loss, theft, destruction or mutilation of this Warrant, and (in the case of 
loss, theft or destruction) of indemnification satisfactory to the Company, 
and upon surrender and cancellation of this Warrant, if mutilated, the 
Company shall execute and deliver a new Warrant of like tenor and date.

     SECTION 5.  RIGHTS OF HOLDER.  Holder shall not, by virtue hereof, be 
entitled to any rights of a stockholder in the Company, either at law or 
equity, and the rights of Holder are limited to those expressed in this 
Warrant. Nothing contained in this Warrant shall be construed as conferring 
upon Holder hereof the right to vote or to consent or to receive notice as a 
stockholder of the Company on any matters or with respect to any rights 
whatsoever as a stockholder of the Company.  No dividends or interest shall 
be payable or accrued in respect of this Warrant or the interest represented 
hereby or the Warrant Shares purchasable hereunder until, and only to the 
extent that, this Warrant shall have been exercised in accordance with its 
terms.

     SECTION 6.  ADJUSTMENT OF EXERCISE PRICE AND NUMBER OF SHARES.  The 
number and kind of securities purchasable upon the exercise of this Warrant 
and the Exercise Price shall be subject to adjustment from time to time upon 
the beginning of certain events, as follows:

          (a)  ADJUSTMENT FOR CHANGE IN CAPITAL STOCK.  If at any time after
April 4, 1996, the Company:
                                       3.

<PAGE>

               (A)  pays a dividend or makes a distribution on its Common 
                    Stock in shares of its Common Stock;

               (B)  subdivides its outstanding shares of Common Stock into a
                    greater number of shares;

               (C)  combines its outstanding shares of Common Stock into a
                    smaller number of shares;

               (D)  makes a distribution on its Common Stock in shares of its
                    capital stock other than Common Stock; or

               (E)  issues by reclassification of its Common Stock any shares of
                    its capital stock;

then the Exercise Price in effect immediately prior to such action shall be 
adjusted so that Holder may receive upon exercise of this Warrant and payment 
of the same aggregate consideration the number of shares of capital stock of 
the Company which Holder would have owned immediately following such action 
if Holder had exercised this Warrant immediately prior to such action.

     The adjustment shall become effective immediately after the record date 
in the case of a dividend or distribution and immediately after the effective 
date in the case of a subdivision, combination or reclassification.

          (b)  CURRENT MARKET PRICE.  The current market price per share of 
Common Stock on any date is the average of the Quoted Prices of the Common 
Stock for the 30 consecutive trading days commencing 45 trading days before 
the date in question.  The "Quoted Price" of the Common Stock is the last 
reported sales price of the Common Stock as reported by the Nasdaq National 
Market, or the primary national securities exchange on which the Common Stock 
is then quoted; provided, however, that if the Common Stock is neither traded 
on the Nasdaq National Market nor on a national securities exchange, the 
price referred to above shall be the price reflected on the Nasdaq National 
Market, or if the Common Stock is not then traded on the Nasdaq National 
Market, the price reflected in the over-the counter market as reported by the 
National Quotation Bureau, Inc. or any organization performing a similar 
function.

          (c)  MINIMUM ADJUSTMENT.  No adjustment in the Exercise Price of 
this Section 6 shall be required unless such adjustment would require an 
increase or decrease of at least twenty-five cents ($.25) in such Exercise 
Price; PROVIDED, HOWEVER, that any adjustments which by reason of this 
subsection are not required to be made, shall be carried forward and taken 
into account in any subsequent adjustment.  All calculations under this 
Section 6 shall be made to the nearest cent or to the nearest share, as the 
case may be.

          (d)  DEFERRAL OF ISSUANCE OR PAYMENT.  In any case in which an event
covered by this Section 6 shall require that an adjustment in the Exercise Price
be made effective as of
                                       4.

<PAGE>

a record date, the Company may elect to defer until the occurrence of such 
event (i) issuing to Holder, if this Warrant is exercised after such record 
date, the shares of Common Stock and other capital stock of the Company, if 
any, issuable upon such exercise over and above the shares of Common Stock or 
other capital stock of the Company, if any, issuable upon such exercise on 
the basis of the Exercise Price in effect prior to such adjustment, and (ii) 
paying to Holder by check any amount in lieu of the issuance of fractional 
shares pursuant to Section 3.

          (e)  WHEN NO ADJUSTMENT REQUIRED.  No adjustment need be made for a 
change in the par value or no par value of the Common Stock.  To the extent 
this Warrant becomes exercisable into cash, no adjustment need be made 
thereafter as to the cash, and interest will not accrue on the cash.

          (f)  NOTICE OF CERTAIN ACTIONS.  In the event that:

               (A)  the Company shall authorize the issuance to all holders 
of its Common Stock of rights, warrants, options or convertible securities to 
subscribe for or purchase shares of its Common Stock or of any other 
subscription rights, warrants, options or convertible securities; or 

               (B)  the Company shall authorize the distribution to all 
holders of its Common Stock of evidences of its indebtedness or assets (other 
than dividends paid in or distributions of the Company's capital stock for 
which the Exercise Price shall have been adjusted pursuant to subsection (a) 
of this Section 6 or cash dividends or cash distributions payable out of 
consolidated current or retained earnings as shown on the books of the 
Company and paid in the ordinary course of business); or

               (C)  the Company shall authorize any capital reorganization or 
reclassification of the Common Stock (other than a subdivision or combination 
of the outstanding Common Stock and other than a change in par value of the 
Common Stock) or of any consolidation or merger to which the Company is a 
party and for which approval of any stockholders of the Company is required 
(other than a consolidation or merger in which the Company is the continuing 
corporation and that does not result in any reclassification or change of the 
Common Stock outstanding), or of the conveyance or transfer of the properties 
and assets of the Company as an entirety or substantially as an entirety; or

               (D)  the Company is the subject of a voluntary or involuntary 
dissolution, liquidation or winding-up procedure; or

               (E)  the Company proposes to take any action (other than 
actions of the character described in subsection (a) of this Section 6) that 
would require an adjustment of the Exercise Price pursuant to this Section 6;

then the Company shall cause to be mailed by first-class mail to Holder, at
least twenty (20) days prior to the applicable record or effective date
hereinafter specified, a notice stating (x) the date as of which the holders of
Common Stock of record to be entitled to receive any such

                                       5.

<PAGE>

rights, warrants or distributions are to be determined, or (y) the date on 
which any such consolidation, merger, conveyance, transfer, dissolution, 
liquidation or winding-up is expected to become effective, and the date as of 
which it is expected that holders of Common Stock of record shall be entitled 
to exchange their shares of Common Stock for securities or other property, if 
any, deliverable upon such reorganization, reclassification, consolidation, 
merger, conveyance, transfer, dissolution, liquidation or winding-up.

          (g)  NO ADJUSTMENT UPON EXERCISE OF WARRANT.  No adjustments shall 
be made under any Section herein in connection with the issuance of Warrant 
Shares upon exercise of this Warrant.

     SECTION 7.  OFFICERS' CERTIFICATE.  Whenever the Exercise Price shall be 
adjusted as required by the provisions of Section 6, the Company shall 
forthwith file in the custody of its Secretary or an Assistant Secretary at 
its principal office an officers' certificate showing the adjusted Exercise 
Price determined as herein provided, setting forth in reasonable detail the 
facts requiring such adjustment and the manner of computing such adjustment.  
Each such officers' certificate shall be signed by the chairperson, president 
or chief financial officer of the Company and by the secretary or any 
assistant secretary of the Company.  Each such officers' certificate shall be 
made available at all reasonable times for inspection by Holder.

     SECTION 8.  RECLASSIFICATION, REORGANIZATION, CONSOLIDATION OR MERGER.  
In the event of any reclassification, capital reorganization or other change 
of outstanding shares of Common Stock of the Company (other than a 
subdivision or combination of the outstanding Common Stock and other than a 
change in the par value of the Common Stock) or in the event of any 
consolidation or merger of the Company with or into another corporation 
(other than a merger in which the Company is the continuing corporation and 
that does not result in any reclassification, capital reorganization or other 
change of outstanding shares of Common Stock of the class issuable upon 
exercise of this Warrant) or in the event of any sale, lease, transfer or 
conveyance to another corporation of the property and assets of the Company 
as an entirety or substantially as an entirety, the Company shall, as a 
condition precedent to such transaction, cause effective provisions to be 
made so that Holder shall have the right thereafter, by exercising this 
Warrant, to purchase the kind and amount of shares of stock and other 
securities and property (including cash) receivable upon such 
reclassification, capital reorganization and other change, consolidation, 
merger, sale or conveyance by a holder of the number of shares of Common 
Stock that might have been received upon exercise of this Warrant immediately 
prior to such reclassification, capital reorganization, change, 
consolidation, merger, sale or conveyance. Any such provision shall include 
provisions for adjustments in respect of such shares of stock and other 
securities and property that shall be as nearly equivalent as may be 
practicable to the adjustments provided for in this Warrant.  The foregoing 
provisions of this Section 8 shall similarly apply to successive 
reclassifications, capital reorganizations and changes of shares of Common 
Stock and to successive consolidations, mergers, sales or conveyances. In the 
event that in connection with any such capital reorganization, or 
reclassification, consolidation, merger, sale or conveyance, additional 
shares of Common Stock shall be issued in exchange, conversion, substitution 
or payment, in whole or in part, for, or of, a security of

                                       6.

<PAGE>

the Company other than Common Stock, any such issue shall be treated as an 
issue of Common Stock covered by the provisions of subsection (a) of Section 
6.

     SECTION 9.  TRANSFER TO COMPLY WITH THE SECURITIES ACT OF 1933.  This 
Warrant may not be exercised and neither this Warrant nor any of the Warrant 
Shares, nor any interest in either, may be offered, sold, assigned, pledged, 
hypothecated, encumbered or in any other manner transferred or disposed of, 
in whole or in part, except in compliance with applicable United States 
federal and state securities or Blue Sky laws and the terms and conditions 
hereof.  Each Warrant shall bear a legend in substantially the same form as 
the legend set forth on the first page of this Warrant.  Each certificate for 
Warrant Shares issued upon exercise of this Warrant, unless at the time of 
exercise such Warrant Shares are acquired pursuant to a registration 
statement that has been declared effective under the Act and applicable blue 
sky laws, shall bear a legend substantially in the following form:

     THE SECURITIES REPRESENTED HEREBY HAVE NOT BEEN REGISTERED UNDER THE
     SECURITIES ACT OF 1933, AS AMENDED (THE "ACT"), OR UNDER THE
     SECURITIES LAWS OF ANY STATE.  THESE SECURITIES ARE SUBJECT TO
     RESTRICTIONS ON TRANSFERABILITY AND RESALE AND MAY NOT BE TRANSFERRED
     OR RESOLD EXCEPT AS PERMITTED UNDER THE ACT AND THE APPLICABLE STATE
     SECURITIES LAWS, PURSUANT TO REGISTRATION OR EXEMPTION THEREFROM.  THE
     ISSUER OF THESE SECURITIES MAY REQUIRE AN OPINION OF COUNSEL IN FORM
     AND SUBSTANCE SATISFACTORY TO THE ISSUER TO THE EFFECT THAT ANY
     PROPOSED TRANSFER OR RESALE IS IN COMPLIANCE WITH THE ACT AND ANY
     APPLICABLE STATE SECURITIES LAWS.

Any certificate for any Warrant Shares issued at any time in exchange or 
substitution for any certificate for any Warrant Shares bearing such legend 
(except a new certificate for any Warrant Shares issued after the acquisition 
of such Warrant Shares pursuant to a registration statement that has been 
declared effective under the Act) shall also bear such legend unless, in the 
opinion of counsel for the Company, the Warrant Shares represented thereby 
need no longer be subject to the restriction contained herein.  The provision 
of this Section 9 shall be binding upon all subsequent holders of 
certificates for Warrant Shares bearing the above legend and all subsequent 
holders of this Warrant, if any.

     SECTION 10.  REGISTRATION RIGHTS.

          (a)  If at any time prior to the Expiration Date, the Company shall
determine to register any of its Common Stock, for its own account or for the
account of others on a Registration Statement on Form S-1 or Form S-3, the
Company will:

               (A)  promptly give Holder written notice thereof (which shall
include a list of the jurisdictions in which the Company intends to attempt to
qualify such securities under the applicable blue sky or other state
securities); and

                                       7.

<PAGE>

               (B)  include in such registration (and any related 
qualification under blue sky laws or other compliance), and in any 
underwriting involved therein, all shares of Common Stock of the Company 
obtained upon exercise of this Warrant (the "Registrable Securities") 
specified in a written request or requests by Holder, received by the Company 
within twenty (20) days after such written notice is given, requesting 
inclusions in such registration.

          (b)  UNDERWRITING.  If the registration of which the Company gives 
notice is for a registered public offering involving an underwriting, the 
Company shall so advise Holder as a part of the written notice given pursuant 
to Section 10(a)(A).  In such event, the right of Holder to registration 
pursuant to this Section 10 shall be conditioned upon Holder's participation 
in such underwriting and the inclusion of Holder's Registrable Securities in 
the underwriting to the extent provided herein.

          Holder shall (together with the Company and the other holders 
distributing their securities through such underwriting) enter into an 
underwriting agreement in customary form with the underwriter or underwriters 
selected for such underwriting by the Company.  Notwithstanding any other 
provision of this Section 10, if the underwriter determines that marketing 
factors require a limitation of the number of shares to be underwritten, the 
underwriter may exclude some or all the Registrable Securities from such 
registration and underwriting.  

          If Holder disapproves of the terms of any such underwriting, Holder 
may select to withdraw therefrom by written notice to the Company and the 
underwriter.  Any Registrable Securities so withdrawn from such underwriting 
shall also be withdrawn from such registration.

          (c)  The Company shall bear registration expenses (exclusive of 
underwriting discounts and commissions) for the Form S-1 or Form S-3 
registration.

          (d)  If requested by the underwriters, Holder, or any assignee of 
Holder, will not sell or otherwise transfer or dispose of any securities of 
the Company held by Holder for a period of up to 180 days following a public 
offering by the Company of its capital stock.

          (e)  (A)  The Company will indemnify Holder, each of Holder's
officers, directors, partners and agents, and each person controlling Holder,
with respect to which registration, qualification or compliance has been
effected pursuant to this Section 10, and each underwriter, if any, and each
person who controls any underwriter against all claims, losses, damages and
liabilities (or actions in respect thereof) including any of the foregoing
incurred in settlement of any litigation commenced or threatened arising out of
or based on (i) any untrue statement (or alleged untrue statement) of a material
fact contained in any prospectus, offering circular or other similar document
(including any related registration statement, notification or the like)
incident to any such registration, qualification or compliance, or based on any
omission (or alleged omission) to state therein a material fact required to be
stated therein or necessary to make the statements therein not misleading in the
light of the circumstances under which they were made, or (ii) any violation (or
alleged violation) by the Company of any federal, state or common law rule or
regulation applicable to the Company in connection with any such

                                       8.

<PAGE>

registration, qualification or compliance, and will reimburse Holder, each 
of its officers, directors, partners and agents, and each person controlling 
Holder, each such underwriter and each person who controls any such 
underwriter, for any legal and any other expenses reasonably incurred in 
connection with investigating or defending any such claim, loss, damage, 
liability or action, as incurred, provided that the Company will not be 
liable in any such case to the extent that any such claim, loss, damage, 
liability or expense arises out of or is based on any untrue statement (or 
alleged untrue statement) or omission (or alleged omission) based upon 
written information furnished to the Company by an instrument duly executed 
by Holder or such underwriter and stated to be specifically for use therein.  

          (B)  Holder will, if Registrable Securities held by Holder are 
included in the securities as to which such registration, qualification or 
compliance is being effected, indemnify the Company, each of its directors 
and officers, each legal counsel and independent accountant of the Company, 
each underwriter, if any, of the Company's securities covered by such a 
registration statement, each person who controls the Company or such 
underwriter within the meaning of the Securities Act, and each other such 
holder, each of its directors, officers, and partners and agents and each 
person controlling such other holder, against all claims, losses, damages and 
liabilities (or actions in respect thereof) including any of the foregoing 
incurred in settlement of any litigation commenced or threatened arising out 
of or based on any untrue statement (or alleged untrue statement) of a 
material fact contained in any such registration statement, prospectus, 
offering circular or other similar document (including any related 
registration statement, notification or the like) incident to any such 
registration, qualification or compliance, or any omission (or alleged 
omission) to state therein a material fact required to be stated therein or 
necessary to make the statements therein not misleading in the light of the 
circumstances under which they were made, and will reimburse the Company, its 
directors, officers, legal counsel, accountants, underwriters, control 
persons and such other holders and each such holder's directors, officers, 
partners, agents and control persons for any legal and any other expenses 
reasonably incurred in connection with investigating or defending any such 
claim, loss, damage, liability or action, as incurred, in each case to the 
extent, but only to the extent, that such untrue statement (or alleged untrue 
statement) or omission (or alleged omission) is made in such registration 
statement, prospectus, offering circular or other document in reliance upon 
and in conformity with written information furnished to the Company by an 
instrument duly executed by Holder and stated to be specifically for use 
therein; provided, however, that the obligations of Holder hereunder shall be 
limited to an amount equal to the proceeds to Holder for Registrable 
Securities sold as contemplated herein.  

          (C)  Each party entitled to indemnification under this Section 
10(e) (the "Indemnified Party") shall give notice to the party required to 
provide indemnification (the "Indemnifying Party") promptly after such 
Indemnified Party has received written notice of any claim as to which 
indemnity may be sought, and shall permit the Indemnifying Party to assume 
the defense of any such claim or any litigation resulting therefrom, provided 
that counsel for the Indemnifying Party, who shall conduct the defense of 
such claim or litigation, shall be approved by the Indemnified Party (whose 
approval shall not unreasonably be withheld).  The Indemnified Party may 
participate in such defense at the Indemnified Party's expense; provided, 
however, that the Indemnifying Party shall bear the expense of such defense 
of the Indemnified Party if

                                      9.

<PAGE>

representation of both parties by the same counsel would be inappropriate due 
to actual or potential conflicts of interest.  The failure of any Indemnified 
Party to give notice as provided herein shall relieve the Indemnifying Party 
of its obligations under this Section 10(e) only to the extent that such 
failure to give notice shall materially adversely prejudice the Indemnifying 
Party in the defense of any such claim or any such litigation.  No 
Indemnifying Party, in the defense of any such claim or litigation, shall, 
except with the consent of each Indemnified Party, consent to entry of any 
judgment or enter into any settlement which does not include as an 
unconditional term thereof the giving by the claimant or plaintiff to such 
Indemnified Party of a release from all liability in respect to such claim or 
litigation. 

     SECTION 11.  MODIFICATION AND WAIVER.  Neither this Warrant nor any term 
hereof may be changed, waived, discharged or terminated other than by an 
instrument in writing signed by the Company and by Holder.

     SECTION 12.  NOTICES.  Any notice, request or other document required or 
permitted to be given or delivered to Holder or the Company shall be 
delivered or shall be sent by certified mail, postage prepaid, to Holder at 
its address as shown on the books of the Company or to the Company at the 
address indicated therefor in the first paragraph of this Warrant.

     SECTION 13.  DESCRIPTIVE HEADINGS AND GOVERNING LAW.  The description 
headings of the several sections and paragraphs of this Warrant are inserted 
for convenience only and do not constitute a part of this Warrant. This 
Warrant shall be construed and enforced in accordance with, and the rights of 
the parties shall be governed by, the laws of the State of California, 
without regard to its conflicts of laws principles.

     SECTION 14.  WARRANT VALUE.  Holder and the Company hereby agree that 
the value of this warrant is $1,000.

     IN WITNESS WHEREOF, the Company has duly caused this Warrant to be 
signed by its duly authorized officer and to be dated as of __________, 1996.

                         BIOCIRCUITS CORPORATION


                         By:                                
                              Donald B. Hawthorne
                              Chief Financial Officer




                                      10.

<PAGE>

                                  PURCHASE FORM


                                                       Dated ___________, 19____


     The undersigned hereby irrevocably elects to exercise the within Warrant 
No. 1996-___to purchase ______ shares of Common Stock and hereby makes 
payment of $_____________ in payment of the exercise price thereof.

                                   VENTURE LENDING



                                   By:                       
                                      ----------------------------

                                   Print Name:         

                                   Title:           
                                      -----------------------------

<PAGE>
                                 ASSIGNMENT FORM


                                                        Dated _________, 19____



     FOR VALUE RECEIVED, Venture Lending hereby sells, assigns and transfers
unto __________________________________________________ (the "Assignee"),      
           (please type or print in block letters)

_____________________________________________________________________________
                       (insert address)
its right to purchase up to _______ shares of Common Stock represented by this
Warrant No. 1996-___ and does hereby irrevocably constitute and appoint
____________________________  attorney, to transfer the same on the books of the
Company, with full power of substitution in the premises.


                                   VENTURE LENDING



                                   By:                             
                                     ---------------------------------
                                   Print Name:                      
                                              ------------------------- 
                                   Title:
                                         ------------------------------

                                                                     


<PAGE>

                                                            EXHIBIT 5.1

                          [COOLEY GODWARD Letterhead]


January 15, 1997


                                                        DEBORAH A. MARSHALL
                                                        415 843-5137
                                                        [email protected]



Biocircuits Corporation
1324 Chesapeake Terrace
Sunnyvale, CA  94089

RE:  BIOCIRCUITS CORPORATION

Ladies and Gentlemen:

You have requested our opinion with respect to certain matters in connection 
with the filing by Biocircuits Corporation (the "Company") of a Registration 
Statement on Form S-3 (the "Registration Statement") with the Securities and 
Exchange Commission covering the offering of 1,588,677 shares of the 
Company's Common Stock (the "Shares"), with a par value of $0.001 (the 
"Common Stock") to be sold by certain stockholders as described in the 
Registration Statement. Of such Shares (i) 1,111,727 were issued by the 
Company pursuant to the Conversion of the Note (the "Conversion Shares") and 
(ii) 476,950 are issuable pursuant to the exercise of the Warrants (the 
"Warrant Shares"). Defined terms used herein shall have the meanings 
attributed to such terms in the Registration Statement unless otherwise 
stated herein. 

In connection with this opinion, we have examined the Registration Statement, 
the Company's Amended and Restated Certificate of Incorporation and Amended 
and Restated Bylaws, and such other documents, records, certificates, 
memoranda and other instruments as we deem necessary as a basis for this 
opinion.  We have assumed the genuineness and authenticity of all documents 
submitted to us as originals, the conformity to originals of all documents 
submitted to us as copies thereof, and the due execution and delivery of all 
documents where due execution and delivery are a prerequisite to the 
effectiveness thereof.

On the basis of the foregoing, and in reliance thereon, we are of the opinion 
that (i) the Conversion Shares are validly issued, fully paid, and 
nonassesable and (ii) the Warrant Shares, when issued in accordance with the 
Registration Statement, will be validly issued, fully paid, and nonassessable.

We consent to the filing of this opinion as an exhibit to the Registration 
Statement and to the reference to our firm under the caption "Legal Matters" 
in the Prospectus included in the Registration Statement.

Very truly yours,

Cooley Godward LLP

/s/ Deborah A. Marshall

Deborah A. Marshall




21233587

<PAGE>


                                                    EXHIBIT 23.1



         CONSENT OF ERNST & YOUNG LLP, INDEPENDENT AUDITORS


We consent to the reference to our firm under the caption "Experts" in the 
Registration Statement (Form S-3) and related Prospectus of Biocircuits 
Corporation for the registration of 1,588,677 shares of its common stock and 
to the incorporation by reference therein of our report dated January 12, 
1996, except for 'Nature of Business and Financing' in Note 1 as to which the 
date is March 28, 1996, with respect to the financial statements of 
Biocircuits Corporation included in its Annual Report (Form 10-K) for the 
year ended December 31, 1995, filed with the Securities and Exchange 
Commission.

                                  ERNST & YOUNG LLP

Palo Alto, California
January 13, 1997



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