Blood Systems Laboratories, located in Tempe, Ariz., is a member of the Blood Systems company, one of the oldest and largest blood service providers in the United States. Blood Systems Laboratories specializes in high-volume blood donor testing and infectious disease reference work. Its two national laboratories in Tempe and Dallas test more than 2.6 million blood donations each year for more than 75 blood and tissue collection sites. The DTS laboratory in Tempe also holds accreditation with the State of California. In addition to donor specimen testing, the laboratory also participates in clinical evaluation of reagents, test kits and equipment. BSL is regulated by the FDA, the American Association of Blood Banks/CLIA, Centers for Medicare & Medicaid Services, the State of New York, the State of California and the State of Arizona.