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Quest Diagnostics Locations, Interactive Maps, Phone, Website and More. Quest Diagnostics is a Madison, New Jersey based company that provides clinical laboratory services - namely, lab tests. There are Quest Diagnostics labs in all 50 US states, as well as Brazil, the UK, Mexico, India, and Puerto Rico. Quest Diagnostics is an S&P 500 and Fortune 500 company; it's listed on the New York Stock Exchange as DGX. There are over 2,000 Quest Diagnostics labs, employing over 43,000 technicians altogether.