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.

Now Available: LOINC 2.72 from Regenstrief Institute

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

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

2022 LOINC Conference

Save the dates Oct. 25-27 for the 2022 LOINC Conference in Annecy, France and online. Supported by bioMérieux.

LOINC Release Webinar

Watch a recording of our 90-minute webinar about what is included in the LOINC 2.72 release.


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.