Welcome to the LOINC Library. This is our A to Z collection of resources that we've collected to help you learn about LOINC and get connected to the community.

Free Quick Start Guide

Complete our free registration to get your complimentary PDF for fast LOINCing.

Get Started

A step-by-step primer for getting acquainted with LOINC.

Knowledge Base

Browse by topic or search this comprehensive collection of LOINC documentation.

Watch an Introduction to LOINC

Ready to learn more? See this hour-long introductory video.
Your definitive document about LOINC. It explains the rationale for LOINC, the structure of the table, and the rules LOINC uses for naming test results.

Translations: Chinese, Estonian, German, Italian, Spanish, Turkish

The ultimate guide to using all aspects of the RELMA program including installation, search syntax, and how to make LOINC submissions.

Translations: Chinese, Estonian, Turkish

Clem McDonald, MD

LOINC's origin story

Learn about the genesis of LOINC with Dr. Clem McDonald in 1994.

Some frequently asked questions

LOINC community resources