LabCorp, also known as the Laboratory Corporation of America Holdings, operates more than 35 laboratories and over 1,600 patient service centers in the United States. The company specializes in blood and genomic testing services. With annual revenues of nearly $4 billion, it employs a staff of approximately 28,000 people throughout the world. The company s clients include physician offices, hospitals, managed care organizations, and biotechnology and pharmaceutical firms. LabCorp s companies include DIANON Systems, Dynacare Laboratories, Esoterix and ViroMed Laboratories. The company also operates National Genetics Institute and the Center for Molecular Biology and Pathology. Its laboratories use the Polymerase Chain Reaction technology. LabCorp s company, US LABS, operates anatomic pathology laboratories that conduct esoteric oncology tests.