The international standard for identifying health measurements, observations, and documents.

Reference labs, healthcare providers, government agencies, insurance companies, software and device manufacturers, researchers, and consumers from around the globe use LOINC to identify data and move it seamlessly between systems.

It’s free, but invaluable.

New Release skyline
New Release skyline

2022 LOINC Conference

Register now for the 2022 LOINC Conference in Annecy, France and online! Supported by bioMérieux.

Try the new LOINC Hierarchy Browser

This resource allows you to browse LOINC concepts across several hierarchies. It's the perfect complement to SearchLOINC.

New features for LOINC's Terminology Service using HL7® FHIR®

Learn all about support for versioning and translations of LOINC using this API.


Full list of LOINCs related to SARS-CoV-2/COVID-19

Guidance for mapping to SARS-CoV-2 LOINC terms


Explore LOINC codes directly in your web browser.
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Submission Queue

LOINC continues to evolve thanks to new term requests. See what we're working on now.

Knowledge Base

Find answers to your LOINC questions in this searchable resource.

Request a new LOINC term

Follow our steps to make your submission.