Quest Diagnostics Incorporated , the world's leading provider of diagnostic testing, information and services, today announced that its Board of Directors declared a quarterly cash dividend on Quest Diagnostics common stock of $0.10 per share, payable on October 20, 2008, to shareholders of record on October 3, 2008.

About Quest Diagnostics

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 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.

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SOURCE: Quest Diagnostics Incorporated

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

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