Quest Diagnostics
Quest Diagnostics is a Fortune 500 American clinical laboratory company (NYSE: DGX) founded in 1967 and headquartered in Secaucus, New Jersey. It operates primarily in the United States, Puerto Rico, Mexico, and Brazil, providing diagnostic testing services across cancer, cardiovascular, infectious, neurological disorders, COVID-19, and drug testing. The company employs about 14k+ people and generates roughly $11B in annual revenue, with a market cap around $14.4B. For location-specific inquiries (e.g., Lancaster), Quest Diagnostics maintains laboratories and testing services regionally—contact wellness@questdiagnostics.com or call +1-866-697-8378 for assistance and to confirm service availability near Lancaster.



