HL7 Terminology (THO)
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Unified Code for Units of Measure (UCUM) Metadata Record

Metadata Record Information Version 20251031
Maintained By HL7 Terminology Services Management Group (TSMG)
Last Updated Date 31 October 2025
Responsible Organizations Regenstrief Institute Roles
  • Code System Owner
  • Code System Maintainer (Steward)
  • Code System Publisher
Website https://www.regenstrief.org/
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Code System Names Formal name Unified Code for Units of Measure (UCUM)
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Code System Technical Identifiers Identification Record
TSMG-endorsed URI http://unitsofmeasure.org
TSMG-endorsed OID 2.16.840.1.113883.6.8
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Description
The Unified Code for Units of Measure (UCUM) is a code system intended to include all units of measures being contemporarily used in international science, engineering, and business. The purpose is to facilitate unambiguous electronic communication of quantities together with their units. The focus is on electronic communication, as opposed to communication between humans. A typical application of The Unified Code for Units of Measure are electronic data interchange (EDI) protocols, but there is nothing that prevents it from being used in other types of machine communication.
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Code System Copyright, Intellectual Property and Licensing Copyright Statement
The UCUM codes, UCUM table (regardless of format), and UCUM Specification are copyright 1999-2009, Regenstrief Institute, Inc. and the Unified Codes for Units of Measures (UCUM) Organization. All rights reserved. https://ucum.org/trac/wiki/TermsOfUse
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