• Pathologist Associated Medical Laboratories

• Quest Diagnostics Incorporated Diagnostic laboratories and patient service centers located throughout the country.

• Research & Diagnostic Laboratories, Inc. services include, testing of source plasma and whole blood for HIV 1/2, HCVAB, HBsAg, HIV-Ag, and more.

• Rheumatology Diagnostics Laboratory immunology laboratory, providing services to internists, rheumatologists and hospitals.

• Sainte-Odile Laboratory information about the medical analysis laboratory and resources for health professionals.

• Salimetrics manufactures and distributes non-isotopic immunoassays kits designed for measurement of salivary biomarkers. Also provides laboratory testing services.

• Sanascan Medical Analysis provides hair analysis tests for mineral and trace elements as well as toxic materials.

• Scantox performs medical device, biological control, and toxicology testing, dermal studies, consultancy, and more.

• SCSA Diagnostics, Inc. measures DNA fragmentation in sperm nuclei and provides statistical probability of infertility.

• Sonic Healthcare provides pathology and radiology services to medical practitioners, hospitals, community medical services, and their patients.

• Unilab Corporation providing clinical laboratory services throughout California.

• Wampole Laboratories producer of diagnostic tests for pregnancy, rheumatoid arthritis, streptococcal infections, and mononucleosis.

• West Coast Analytical Service, Inc. providing a full range of analytical chemistry services with emphasis on the environmental and pharmaceutical industries.

• Your Health Lab offers a variety of tests without doctor's orders including drug screens, HIV, and cholesterol.