Laboratory Corporation of America Holdings, a clinical laboratory company, offers tests (blood chemistry analyses, urinalyses, blood cell counts, thyroid tests, Pap tests, tests for sexually transmitted diseases, hepatitis C tests, microbiology cultures and procedures, and alcohol and other substance-abuse tests). The company also provides gene-based and esoteric testing, and advanced tests targeting specific diseases. LabCorp was founded in 1971 and is headquartered in Burlington, NC.