Quest Diagnostics Incorporated , the nation's leading provider of diagnostic testing, information and services, today announced that it was again selected to be part of the Dow Jones Sustainability (DJSI) World and North American Indexes. The company was first added to the World Index in 2004 and the North American Index in 2005.

According to DJSI, companies were identified as "sustainability leaders" and ranked according to objective benchmarks linked to financial, environmental and social criteria. The DJSI defines corporate sustainability as "a business approach that creates long-term shareholder value by embracing opportunities and managing risks deriving from economic, environmental and social developments. Corporate sustainability leaders achieve long-term shareholder value by gearing their strategies and management to harness the market's potential for sustainability products and services while at the same time successfully reducing and avoiding sustainability costs and risks."

The DJSI Sustainability Indexes are the first global indexes tracking the financial performance of the leading sustainability-driven companies worldwide. The indexes provide asset managers with reliable and objective benchmarks to manage sustainability portfolios. The DJSI World Index contains approximately 300 companies, and the DJSI North America Index contains approximately 100 companies that were selected from among the largest 600 North American corporations of the Dow Jones Global Index. DJSI indexes are produced by Sustainable Asset Management Group (SAM), based in Zurich, Switzerland, together with Dow Jones Indexes and STOXX Limited. Additional information about the DJSI, including a list of all component companies, is available at: www.sustainability-indexes.com.

About Quest Diagnostics

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.

This communication contains certain forward-looking statements. These forward-looking statements, which may include, but are not limited to, statements concerning the proposed acquisition, are based on management's current expectations and estimates and involve risks and uncertainties that could cause actual results or outcomes to differ materially from those contemplated by the forward-looking statements. Certain of these risks and uncertainties may include, but are not limited to the risks and uncertainties described in the Quest Diagnostics Incorporated 2006 Form 10-K and subsequent filings.

First Call Analyst:
FCMN Contact: wendy.h.bost@questdiagnostics.com

SOURCE: Quest Diagnostics Incorporated

CONTACT: Investors: Laure Park, +1-201-393-5030, or Media: Wendy Bost,
+1-201-393-5700, both of Quest Diagnostics Incorporated

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