• Logical Observation Identifiers Names and Codes (LOINC) Dataset of universal identifiers for laboratory and other clinical observations to facilitate exchange and storage of clinical results or vital signs for patient care and research. Includes downloads, news, meetings, background, articles, e-mail list and submissions. Links to its custodians the Regenstrief Institute.

• OpenGALEN An open source terminology with tools, expertise and experience in building and delivering a multiaxial medical concept model and terminology.

• SNOMED International: The Systematized Nomenclature of Medicine A dynamic, sustainable, scientifically validated terminology developed by College of American Pathologists (CAP) to enable the sharing of health care knowledge across clinical specialties and sites of care. Includes news, events, services, programs, related sites, training, careers and details of user groups.