Quest Diagnostics Incorporated , the nation's leading provider of diagnostic testing, information and services, announced that it is scheduled to speak at the Jefferies Healthcare Conference on Tuesday, June 24, 2008. The Quest Diagnostics presentation is scheduled to begin at 9:00a.m. Eastern Time.

The presentation will be webcast live during the conference and will be available to registered investors on the following site: http://www.wsw.com/webcast/jeff26/dgx and to the public on http://www.questdiagnostics.com/. In addition, the archived webcast will be available immediately following the live presentation and will remain available until July 24, 2008.

Quest Diagnostics is the leading provider of diagnostic testing, information and services that patients and doctors need to make better healthcare decisions. The company offers the broadest access to diagnostic testing services through its national network of laboratories and patient service centers, and provides interpretive consultation through its extensive medical and scientific staff. Quest Diagnostics is a pioneer in developing innovative new diagnostic tests and advanced healthcare information technology solutions that help improve patient care. Additional company information is available at: www.questdiagnostics.com.

SOURCE: Quest Diagnostics

CONTACT: Investors: Laure Park, +1-973-520-2900, or Media: Nancy
Fitzsimmons, +1-973-520-2800, both of Quest Diagnostics

Web site: http://www.questdiagnostics.com/
http://www.wsw.com/webcast/jeff26/dgx