Laboratory Corporation of America Holdings is a clinical laboratory company in the United States. Through a national network of laboratories, the Company offers a range of testing services used by the medical profession in routine testing, patient diagnosis, and in the monitoring and treatment of disease. In addition, it has developed specialty and niche operations based on certain types of specialized testing capabilities and client requirements, such as oncology testing, human immunodeficiency virus (HIV) genotyping and phenotyping, diagnostic genetics and clinical research trials. It processes tests on approximately 470,000 patient specimens daily and provides clinical laboratory testing services in all 50 states, the District of Columbia, Puerto Rico, Belgium, Japan, the United Kingdom, China, Singapore and three provinces in Canada.