FHIR Release 3 (STU) CI-Build

This page is part of the FHIR Specification (v3.0.2: STU 3). The current version which supercedes this version is 5.0.0 . For a full list Continuous Integration Build of available versions, see FHIR (will be incorrect/inconsistent at times).
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Using Codes Code Systems Value Sets Concept Maps Identifier Systems

4.3.1.70 4.4.1.171 Value Set ValueSet http://hl7.org/fhir/ValueSet/units-of-time

  Maturity Level : 0
Responsible Owner: FHIR Infrastructure icon Work Group Informative Normative Use Context : Any Country: World
This is a value set defined by the FHIR project. Summary
  • Defining URL: Narrative http://hl7.org/fhir/ValueSet/units-of-time
  • XML Name:
  • UnitsOfTime JSON
  • Definition: TTL A unit of time (units from UCUM).
Copyright:
Official URL : Committee: http://hl7.org/fhir/ValueSet/units-of-time Work Group OID: 2.16.840.1.113883.4.642.3.70 (for OID based terminology systems) Version : 6.0.0-ballot3
active as of 2025-11-09 These codes are excerpted from UCUM (THE UNIFIED CODE FOR UNITS OF MEASURE). UCUM is Copyright © 1989-2013 Regenstrief Institute, Inc. and The UCUM Organization, Indianapolis, IN. All rights reserved. See http://unitsofmeasure.org/trac//wiki/TermsOfUse for details. Computable Name : UnitsOfTime
Source Resource Flags : XML / JSON OID : 2.16.840.1.113883.4.642.3.77

This value set is used in the following places:

Extension http://hl7.org/fhir/StructureDefinition/observation-eventTiming: eventTiming (( Required

4.4.1.171.1 Definition ))

A unit of time (units from UCUM).

4.3.1.70.1 4.4.1.171.2 Content Logical Definition

Generated Narrative: ValueSet units-of-time This value set includes codes from the following code systems:

Last updated: 2025-11-09T20:40:27.672Z

  • Include these codes as defined in http://unitsofmeasure.org icon version Not Stated (use latest from terminology server)
    Code Display Definition 中文 (Chinese, zh)
    s second second 秒
    min minute minute 分钟
    h hour hour 小时
    d day day 天
    wk week week 星期
    mo month month - Normal practice is to use the 'mo' code as a calendar month when calculating the next occurrence. 月
    a year year 年

 

4.4.1.171.3 Expansion

This expansion generated 09 Nov 2025

Additional Language Displays ValueSet

Expansion from tx.fhir.org based on codesystem UCUM version 2.2

This value set contains 7 concepts

System Code 中文 (Chinese, zh) Display Display (中文)
http://unitsofmeasure.org   s s 秒
http://unitsofmeasure.org   min min 分钟
http://unitsofmeasure.org   h h 小时
http://unitsofmeasure.org   d d 天
http://unitsofmeasure.org   wk wk 星期
http://unitsofmeasure.org   mo mo 月
http://unitsofmeasure.org   a a 年

 

See the full registry of value sets defined as part of FHIR.

Explanation of the columns that may appear on this page:

Level Lvl A few code lists that FHIR defines are hierarchical - each code is assigned a level. In this scheme, some codes For value sets, levels are under other codes, and imply that the mostly used to organize codes for user convenience, but may follow code they are under also applies system hierarchy - see Code System for further information
Source The source of the definition of the code (when the value set draws in codes defined elsewhere)
Code The code (used as the code in the resource instance). If the code is in italics, this indicates that the code is not selectable ('Abstract')
Display The display (used in the display element of a Coding ). If there is no display, implementers should not simply display the code, but map the concept into their application
Definition An explanation of the meaning of the concept
Comments Additional notes about how to use the code