LOINC Ontology
A LOINC and SNOMED CT Interoperability Solution
The LOINC Ontology supports providers and users who implement different combinations of SNOMED CT and LOINC in health information systems and allows them to meet clinical and regulatory requirements in a single solution.
An extension of SNOMED CT’s ontological framework, the ontology creates SNOMED CT and LOINC codes for all concepts that are shared between the terminologies. SNOMED CT provides the computable framework and LOINC provides laboratory and pathology content in an understood format to countries that do not currently use LOINC.
Browse and download Version 1.0 of the LOINC Ontology on the collaboration website: loincsnomed.org
Version 1.0 Introductory Webinar
On March 25, 2025, Regenstrief Institute, along with SNOMED International, hosted a webinar to mark the first production release of the LOINC Ontology: A LOINC and SNOMED CT Interoperability Solution. Presenters from both institutions explained the purpose and technical details of this new representation of LOINC terminology using SNOMED's ontological framework.