Logical Observation Identifiers Names and Codes
Universal standard for lab tests and clinical observations. ~100,000 terms for lab, clinical, and surveys.
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Where this one tends to earn its keep.
Standardize lab test ordering and results
Clinical observation interoperability
Survey instrument identification
Health information exchange standards
LOINC-LicenceRedistributable for commercial and non-commercial use, but §10 requires extracted content to carry BOTH the LOINC code and a display name — a names-only or codes-only publication breaches it. §5 restricts parts and part hierarchies to "as they are presented".
Verified against the licence text on 2026-08-07.
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