Laboratory Corporation of America Holdings is a life sciences company that is integrated in guiding patient care, providing clinical laboratory and end-to-end drug development services. The Company operates as a healthcare diagnostics company. The Company operates through two segments: LabCorp Diagnostics (LCD) and Covance Drug Development (CDD). The LCD segment is an independent clinical laboratory business, which offers menu of frequently requested and specialty testing through an integrated network of primary and specialty laboratories across the United States. The CDD segment offers drug development services, and provides a range of drug research and development (R&D) and market access services to biopharmaceutical companies and medical device companies across the world. It serves a range of customers, including managed care organizations (MCOs), biopharmaceutical companies, governmental agencies, physicians and other healthcare providers.