Quest Diagnostics Incorporated , the nation's leading provider of diagnostic testing, information and services, announced that Kenneth W. Freeman, Chairman and Chief Executive Officer, is scheduled to speak at the Thomas Weisel Partners Growth Forum 5.0 on Tuesday, June 17, 2003, at The Bacara Resort in Santa Barbara, California. The Quest Diagnostics presentation is scheduled to begin at 11:40 a.m. Pacific Time.

The presentation will be webcast live during the conference and will be available to registered investors on the following site http://www.veracast.com/webcasts/twp/growth-forum-2003/83207144.cfm and to the public on http://www.questdiagnostics.com/. In addition, the archived webcast will be available starting at approximately 5:00 p.m. Eastern Time on Tuesday, June 17, 2003, and will be available for 30 days.

Quest Diagnostics Incorporated is the nation's leading provider of diagnostic testing, information and services, providing insights that enable physicians, hospitals, managed care organizations and other healthcare professionals to make decisions to improve health. The company offers the broadest access to diagnostic laboratory services through its national network of laboratories and patient service centers. Quest Diagnostics is the leading provider of esoteric testing, including gene-based medical testing, and empowers healthcare organizations and clinicians with state-of-the-art connectivity solutions that improve practice management. Additional company information can be found on the Internet at: http://www.questdiagnostics.com/.

The statements in this press release which are not historical facts or information may be forward-looking statements. These forward-looking statements involve risks and uncertainties that could cause actual results and outcomes to be materially different. Certain of these risks and uncertainties may include, but are not limited to, unanticipated expenditures, changing relationships with customers, suppliers and strategic partners, conditions of the economy and other factors described in the Quest Diagnostics Incorporated 2002 Form 10-K and subsequent filings.

SOURCE: Quest Diagnostics Incorporated

CONTACT: Laure Park, Investors, +1-201-393-5030, Gary Samuels, Media,
+1-201-393-5700, both of Quest Diagnostics Incorporated

Web site: http://www.questdiagnostics.com/
http://www.veracast.com/webcasts/twp/growth-forum-2003/83207144.cfm