Established in 1971, Laboratory Corporation of America Holdings is a provider of medical laboratory tests and services through a national network of primary clinical laboratories. The firm operates a nationwide network of 38 primary testing locations and has expertise in The Center for Molecular Biology and Pathology (CMBP), National Genetics Institute (NGI), ViroMed Inc., The Center for Esoteric Testing (CET) and DIANON Systems Inc., to name a few. Its 220,000 clients include physician offices, hospitals, managed care organizations, biotechnology and pharmaceutical companies.