DRL Labs, located in Tyler, Texas, is a medical reference laboratory and a division of the American Esoteric Laboratories. It has been providing its services to medical professionals for more than 15 years through its modern and advanced facility. It offers a variety of clinical laboratory tests, routine testing, patient diagnosis and monitoring and treatment of disease. Its various tests include hemoglobin, protein method change, carbohydrate antigen, cyclosporine plus assay, schilling, bacterial antigen testing, parathyroid hormone and homocysteine. It also provides throat cultures, ova and parasite extermination and meningitis screening. DRL Labs employs board-certified pathologists and has a 24-hour help line service and a courier services to pick up specimens on a regular schedule.