Exhibit 99.1

[BIOCIRCUITS LETTERHEAD]


                                       Contact: John Kaiser
                                                President & CEO
                                                Biocircuits Corporation
                                                (408) 752-8706

FOR IMMEDIATE RELEASE

                        BIOCIRCUITS ANNOUNCES MARKETING
                       ARRANGEMENT WITH BECTON DICKINSON

SUNNYVALE, CA -- JUNE 30TH, 1997 -- Biocircuits Corporation (Nasdaq: BIOC) 
announced today that the Company has signed a letter of intent to enter into 
an agreement with the Microbiology Systems Division of Becton Dickinson and 
Company. The agreement, when finalized and executed, will give Becton 
Dickinson exclusive world wide marketing rights to the IOS-Registered 
Trademark- system and all cartridges currently available as well as those 
that will be developed in the future. It is also anticipated that Becton 
Dickinson will assume the responsibility for manufacturing of the 
IOS-Registered Trademark- instrument in 1998. Biocircuits will continue to 
manufacture cartridges for transfer to Becton Dickinson as well as developing 
new test cartridges.

"This Agreement presents an exciting opportunity for Biocircuits to partner 
with a large diagnostic company," said John Kaiser, President and CEO of 
Biocircuits. "Becton Dickinson currently markets a number of synergistic 
diagnostic systems and easy to use tests to the same end user and through the 
same distribution channels currently employed by Biocircuits. With their much 
larger sales force and strong presence in the market place, market 
penetration of the IOS-Registered Trademark- system should be significantly 
enhanced."

The IOS-Registered Trademark- system is the first immunoassay system 
developed with the ease of use and cost characteristics necessary for use in 
the approximately 36,000 moderately complex licensed physician office 
laboratories.

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BIOCIRCUITS CORPORATION
Biocircuits Announces Marketing Agreement with
   Becton Dickinson
Page 2



"The ease of use of the IOS-Registered Trademark- system should make it ideal 
for the physician office lab," said Vincent Forlenza, President of the 
Microbiology Systems Division. "We look forward to a productive relationship 
with Biocircuits."

Becton Dickinson and Company sells a broad range of medical supplies and 
devices for use by health care professionals, medical research institutions 
and the general public.

Actual results may differ materially from the above forward-looking 
statements due to a number of important factors, and will be dependent upon 
the Company's ability, directly or through third parties, to successfully 
manufacture and market its existing and proposed products, as well as the 
timely development and regulatory approval of additional products. These 
factors are more fully discussed in the Company's most recent report on Form 
10-K. Further, since the letter of intent with Becton Dickinson is not 
legally binding there can be no assurances that a final agreement will be 
negotiated and finalized.

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