Laboratory Corporation of America Holdings operates as an independent clinical laboratory company in the United States, Canada, United Kingdom, Switzerland, and internationally. It operates through two segments, LabCorp Diagnostics (LCD) and Covance Drug Development. The company provides various clinical laboratory tests, such as blood chemistry analyses, urinalyses, blood cell counts, thyroid tests, Pap tests, hemoglobin A1C, prostate-specific antigens, tests for sexually-transmitted diseases, hepatitis C tests, vitamin D, microbiology cultures and procedures, and alcohol and other substance-abuse tests. It also offers women's health, allergy, diagnostic genetics, cardiovascular disease, infectious disease, endocrinology, oncology, coagulation, pharmacogenetics, toxicology, and medical drug monitoring testing services; parentage and occupational, and wellness testing; and esoteric testing, cancer diagnostics, and other complex procedures. In addition, the company provides technology-enabled solutions, including a suite of applications to enable patients, healthcare providers, health systems, accountable care organizations, and insurers with convenient and secure access to LCD's data and services, as well as billing for laboratory services; and end-to-end drug development, medical device, and diagnostic development solutions for research, clinical development, and commercial market access. It has collaborations with the Cedars-Sinai Medical Center, the Centre for Addiction and Mental Health, Cincinnati Children's Hospital Medical Center, Duke University, Johns Hopkins University, the Medical College of Wisconsin, The Mount Sinai Hospital (New York), Mount Sinai Hospital (Toronto), Roswell Park Comprehensive Cancer Center, the University of Tennessee, and Virginia Commonwealth University. The company was founded in 1971 and is headquartered in Burlington, North Carolina.