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.
Find quick answers in our Knowledge Base.
The LOINC Ontology: A LOINC and SNOMED CT Interoperability Solution
Learn about this collaboration on our dedicated website.
LOINC mapping guides
We have created seven guides for using LOINC terms across various laboratory domains.
New Community Forum
We have launched a new version of our forum where you can ask questions and participate.
SearchLOINC
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.