Quest Diagnostics Incorporated is a leading provider of diagnostic testing, information and services that help patients and physicians make informed decisions about their health. With a comprehensive range of medical testing services, Quest Diagnostics provides access to a wide variety of diagnostic tests and services, including laboratory testing, genetic testing
From Wikipedia
Quest Diagnostics Incorporated is an American clinical laboratory. A Fortune 500 company, Quest operates in the United States, Puerto Rico, Mexico, and Brazil. Quest also maintains collaborative agreements with various hospitals and clinics across the globe.