Introducing the LOINC Ontology: A LOINC and SNOMED CT Interoperability Solution

Visit dedicated website for more information

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.

Find quick answers in our Knowledge Base.

Registration is now open!

LOINC Conference: September 17-20, 2024 at The Dupont Circle Hotel in Washington, DC and Online. The theme is: Making Interoperability Easier

2024 LOINC Conference

Sept. 17-20, 2024  Washington, DC & Online

New LOINC version 2.77

Read all about the updates in this latest version of LOINC.

LOINC Webinar

Watch a recording of our Spring 2024 webinar with updates on our latest activities.

New Community Forum

We have launched a new version of our forum where you can ask questions and participate.


Find LOINC concepts in your browser with this powerful web app. A free LOINC login is required.

Hierarchy Browser

Instead of searching, peruse LOINC codes via numerous hierarchies. A free LOINC login is required.

Community Forum

Ask questions and chime in on conversations with your fellow LOINCers.

Request a LOINC

Cannot find an appropriate LOINC concept? Follow instructions for requesting a new code.

Submission Queue

See all the new concepts we are working on now, including any submissions you may have made.