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Discussion Documents

Discussion documents, papers, and reports concerning the development of LOINC codes.

 archived discussion documents

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LOINC Committee Study of Units Variation


HL7 LOINC Document Type Vocabulary Domain Development

These documents describe the strategy, policies, and procedures that the Clinical LOINC Committee follows in creating names and codes for clinical notes.


Related Standards and Activities

LOINC Value Set of Universal Laboratory Order Codes


LOINC Top 2000+ Common Result Codes



LOINC Codes for Newborn Screening


LOINC Codes for Common Clinical Data Interchange Standards Consortium (CDISC) Tests

This document is a subset of the LOINC® database terms that have been identified by 3 central laboratories as the most frequently used terms in clinical trials. This is a small representation of the LOINC® codes and it is recommended that you use the RELMA® mapping tool to search the database.

CDISC Standard



Regenstrief Institute also maintains the Unified Code for Units of Measure (UCUM) code system, a related standard that includes units of measures being contemporarily used in international science, engineering, and business.



RxTerms is a drug interface terminology derived from RxNorm for prescription writing or medication history recording. CMS is using RxTerms in a demonstration project of its post-acute care assessment tool (CARE), for which a LOINC representation of the assessment tool is also being developed.

Current Versions
LOINC 2.59
Released: 2017-02-21

RELMA 6.18
Released: 2017-02-21

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