Investor Information

Common Stock

Quest Diagnostics Incorporated (ticker symbol: “DGX”) shares are listed on the New York Stock Exchange.

Quest Diagnostics is a component of several stock indices, including the S&P 500, Dow Jones Sustainability World Index and other social responsibility indices.

Annual Meeting

The annual meeting of shareholders will be held on Thursday, May 14, 2009, at Quest Diagnostics Corporate Headquarters, 3 Giralda Farms, Madison, New Jersey, at 10:30 A.M. Eastern Time. A proxy statement and annual report were mailed to shareholders of record as of March 16, 2009.

Additional Information

Corporate news releases, our Annual Report, Proxy Statement, Forms 10-K and 10-Q and other information about the company, including locations of facilities, are available at Quest Diagnostics’ web site at: www.QuestDiagnostics.com/investor

Address all inquiries to:
Investor Relations Department
Quest Diagnostics Incorporated
3 Giralda Farms
Madison, NJ 07940
(973) 520-2900
E-mail:
Investor@QuestDiagnostics.com

Transfer Agent and Registrar

National City Bank acts as transfer agent and registrar and dividend paying agent, and maintains all shareholder records for the company. If you have questions about the shares of Quest Diagnostics you own, wish to report a change of address or lost stock certificates or dividend checks, or would like to enroll in the company’s automatic dividend reinvestment or direct deposit program, please contact National City Bank directly:

National City Bank, now a part of PNC
Shareholder Services Operations
Location 5352
P.O. Box 92301
Cleveland, OH 44101-4301
Phone: (800) 622-6757
E-mail:
shareholder.inquiries@nationalcity.com

Corporate Headquarters

3 Giralda Farms
Madison, NJ 07940
(973) 520-2700

Corporate Governance

We are committed to strong corporate governance. We provide information regarding our corporate governance at www.QuestDiagnostics.com/governance, where we post our Code of Business Ethics, Integrity Commitment, Values, Corporate Governance Guidelines, Certificate of Incorporation and Bylaws. We also post on this web page the charters for committees of our Board of Directors: Audit and Finance Committee; Compensation Committee; Executive Committee; Governance Committee; and Quality, Safety and Compliance Committee.

Senior Contacts

Inquiries to our senior management may be sent via e-mail to: SeniorManagement@QuestDiagnostics.com. Inquiries to our Board of Directors may be sent via e-mail to: LeadIndependentDirector@QuestDiagnostics.com, or by regular mail addressed to:
c/o Corporate Secretary
Quest Diagnostics
3 Giralda Farms
Madison, NJ 07940

Trademarks

Quest, Quest Diagnostics, the associated logo, Nichols Institute and all associated Quest Diagnostics marks are the registered or unregistered trademarks of Quest Diagnostics Incorporated. All third party marks—® and ™—are the property of their respective owners.