Biosite Incorporated To Conduct 3rd Quarter Results Conference Call

Biosite Incorporated announces the following Webcast:

Biosite Incorporated will announce 2005 third quarter results on Tuesday, October 25, 2005 following the close of the market. The Company will also webcast a conference call on the same day (October 25) at 1:30 p.m. Pacific.

What: Biosite Announces 3rd Quarter Results Conference Call When: Tuesday, October 25, 2005 at 1:30 p.m. Pacific

Where: http://phx.corporate-ir.net/phoenix.zhtml?p=irol- eventDetails&c=69046&eventID=1143573

OR www.biosite.com How: Live over the Internet -- Simply log onto the web at the address above. Telephonic: US/Canada/Int’l Dial #: (706) 634-7088 Conference ID# 9802947 You may dial *0 at any time for Operator assistance Contact: Simona Dixon Corporate and Investor Relations Biosite Incorporated 858.805.2824 email: sdixon@biosite.com

If you are unable to participate during the live webcast, the call will be archived on the Biosite web site www.biosite.com until November 15, 2005. The telephone replay number for U.S. callers is 800-642-1687. International callers can dial 706-645-9291, conference ID#9802947.

Company press releases may be found at www.biosite.com

About Biosite: A leader in the drive to advance diagnosis, Biosite Incorporated is a research-based company dedicated to the discovery and development of novel protein-based diagnostic tests that improve a physician’s ability to diagnose debilitating and life-threatening diseases. The Company combines integrated discovery and diagnostics businesses to access proteomics research, identify proteins with high diagnostic utility, develop and commercialize products and educate the medical community on new diagnostic approaches that improve health care outcomes. Biosite’s Triage(R) brand rapid diagnostic tests are used in approximately 50 percent of U.S. hospitals and in more than 50 international markets. Information about Biosite can be found at www.biosite.com.

(Minimum Requirements to listen to broadcast: The Windows Media Player software, downloadable free from: http://www.microsoft.com/windows/windowsmedia/EN/default.asp and at least a 28.8Kbps connection to the Internet.)

Biosite Incorporated

CONTACT: Nadine Padilla, VP, Corporate & Investor Relations of BiositeIncorporated, +1-858-805-2820, npadilla@biosite.com

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