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.

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LOINC 2.74 Release Webinar

Watch a recording of LOINC's webinar from March 28 about the 2.74 release and plans for 2023.

2022 LOINC Conference

Watch recordings from our most recent community event held in Annecy, France and online.

New LOINC mapping guides

We have created six new guides for using LOINC terms across numerous laboratory domains.


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.