A LOINC Database Structure

KB LOINC Users’ Guide A LOINC Database Structure
The database schema for the primary LOINC table as well as MapTo and SourceOrganization are detailed here.
Last updated on April 10, 2026 at 4:12 pm EDT

This section describes the schema of the LOINC database, detailing the fields in the main LOINC table and the related tables MapTo (for replacements to deprecated codes) and SourceOrganization.

The contents of these tables are located in the LoincTable folder of the primary download available from the LOINC website.

Section Contents

A.1 LOINC Table Structure
A.2 MapTo Table Structure
A.3 SourceOrganization Table Structure