FHIR and LOINC
summary
FHIR serves as the transport for LOINC-coded data and lets systems query and act on concrete artifacts: use Observation resource lookups to find LOINC-tested lab values, ValueSet expansions to retrieve enumerated answer lists or LOINC groups (LG- prefixed), and ConceptMap mappings to translate LOINC parts to SNOMED/IEEE/RxNorm. LOINC provides ~87,000+ terms, ~10,000 assessment items, and a terminology server at fhir.loinc.org supporting CodeSystem lookups, value set expands, and published concept maps for interoperable queries.
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