College of American Pathologists (CAP) The CAP Laboratory Accreditation helps laboratories meet Clinical Laboratory Improvement Amendments (CLIA) regulatory requirements (specific to laboratories subject to US regulations). Ensures compliance through the guidance of the most comprehensive scientifically endorsed laboratory standards. The College of American Pathologists (CAP), is a medical society serving approximately 18,000 physician members and the laboratory community throughout the world. It is headquartered in Northfield, Illinois. It is the world’s largest association composed exclusively of pathologists certified by the American Board of Pathologists.