Quest Diagnostics Incorporated (NYSE: DGX) is a United States corporation which provides clinical laboratory services . They also do business in England and Mexico.

Quest Diagnostics is a member of the Fortune 500 and the S&P 500. Corporate headquarters are in Teterboro, New Jersey.

History

• 1967: Founded as MetPath, Inc., in New York.
• 1982: MetPath was acquired by what was then known as Corning Glass Works, and subsequently renamed Corning Clinical Laboratories.
• 1996: Quest Diagnostics becomes an independent company as a spin-off from Corning.
• 1999: Quest Diagnostics acquires SmithKline Beecham Clinical Laboratories; GlaxoSmithKline still holds a large portion of Quest Diagnostics stock.
• 2005: Quest Diagnostics announces they will acquire LabOne, Inc. (NASDAQ: LABS) for $934 million in cash.

Quest Diagnostics performs testing for more than 500,000 patients each day, serving approximately half of the physicians and hospitals in the United States.