Quest Diagnostics Incorporated is the world's leading provider of diagnostic testing, information and services. A United States based corporation that provides clinical laboratory services, the company has operations in the United States, United Kingdom, Mexico and through its wholly-owned subsidiary Quest Diagnostics India Pvt. Ltd, a laboratory in India in addition to service locations located in Brazil. Quest Diagnostics also has collaborative agreements internationally with various hospitals and clinics. Quest Diagnostics also has operations in the US Territory of Puerto Rico. Quest Diagnostics is a member of the Fortune 500 and the S&P 500. The corporate headquarters is located in Madison, New Jersey. The company has approximately 43,000 employees, including some 900 M.D.s and Ph.D.s. - Source: Wikipedia
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