Quest Diagnostics Incorporated , the world's leading provider of diagnostic testing, information and services, announced today that its second-quarter 2008 results will be made public on Tuesday, July 22, before the market opens, and that it will hold its quarterly conference call with investors to discuss the results beginning at 8:30 a.m. ET on that day.

The public may access the conference call through a live audio webcast available on Quest Diagnostics' Investor Relations link on the Internet at www.questdiagnostics.com/investor.

The conference call can also be accessed by dialing 210-839-8500, passcode 3214469. The company suggests participants dial in approximately 10 minutes before the call. Please note that this feature will be in listen-only mode.

A replay of the call may be accessed through the Internet at www.questdiagnostics.com/investor or by dialing 800-284-7027, or 402-220-9738 for international callers. No access code will be required. Telephone replays will be available from 10:30 a.m. ET on July 22 until midnight ET on August 19, 2008.

Anyone listening to the Quest Diagnostics call is encouraged to read Quest Diagnostics' periodic reports, on file with the Securities and Exchange Commission, including the discussion of risk factors and historical results of operations and financial condition in those reports.

Quest Diagnostics is the world's 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 Incorporated

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

Web site: http://www.questdiagnostics.com/
http://www.questdiagnostics.com/investor