Quest Diagnostics is a publicly traded healthcare company specializing in clinical laboratory testing and diagnostic information services. Founded in 1967 in New York City by Paul A. Brown, the organization has evolved through name changes, acquisitions, and strategic expansions to support a broad range of testing modalities. The company maintains its headquarters in Secaucus, New Jersey, and operates nationally and internationally. Quest develops and administers diagnostic testing for conditions spanning oncology, infectious disease, cardiovascular health, and other medical disciplines. As a Fortune 500 company, Quest Diagnostics remains a key provider of laboratory insights used by physicians, hospitals, and other healthcare organizations. Quest Diagnostics is listed on the New York Stock Exchange under the ticker DGX and continues to expand through partnerships and acquisitions to enhance its diagnostic capabilities.