Derived from the world's largest database of clinical lab results, our diagnostic insights reveal new avenues to identify and treat disease, inspire healthy behaviors and improve health care management. Quest diagnostics incorporated is an american clinical laboratory A fortune 500 company, quest operates in the united states, puerto rico, mexico, and brazil Quest diagnostics contact us contact a united kingdom representative contact us by phone +44 (0)500 55 22 22 or +44 (0)20 8377 3400
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