HL7 Terminology (THO)
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CodeSystem: durationCategories

Official URL: http://terminology.hl7.org/CodeSystem/v2-0255 Version: 2.0.0
Active as of 2019-12-01 Responsible: Health Level Seven International Computable Name: DurationCategories
Other Identifiers: urn:ietf:rfc:3986#Uniform Resource Identifier (URI)#urn:oid:2.16.840.1.113883.18.150

Copyright/Legal: This material derives from the HL7 Terminology (THO). THO is copyright ©1989+ Health Level Seven International and is made available under the CC0 designation. For more licensing information see: https://terminology.hl7.org/license

Code system of concepts used to classify an observation definition as intended to measure a patient’s state at a point in time. Used in HL7 Version 2.x messaging in the OM1 segment.

Underlying Master Code System for V2 table 0255 (Duration Categories)

This Code system is referenced in the content logical definition of the following value sets:


This code system defines the following properties for its concepts

statushttp://terminology.hl7.org/CodeSystem/utg-concept-properties#statuscodeStatus of the concept
deprecatedhttp://terminology.hl7.org/CodeSystem/utg-concept-properties#v2-table-deprecatedcodeVersion of HL7 in which the code was deprecated
v2-concCommenthttp://terminology.hl7.org/CodeSystem/utg-concept-properties#v2-concCommentstringV2 Concept Comment
HL7usageNoteshttp://terminology.hl7.org/CodeSystem/utg-concept-properties#HL7usageNotesstringHL7 Concept Usage Notes


This case-sensitive code system http://terminology.hl7.org/CodeSystem/v2-0255 defines the following codes in a Is-A heirarchy:

CodeDisplayDefinitionV2 Concept CommentHL7 Concept Usage Notes
* (asterisk) Life of the "unit"(asterisk) Life of the "unit"Used for blood products.Deprecated March 2016; use code LU instead.
30M 30 minutes30 minutes
1H 1 hour1 hour
2H 2 hours2 hours
2.5H 2 1/2 hours2 1/2 hours
3H 3 hours3 hours
4H 4 hours4 hours
5H 5 hours5 hours
6H 6 hours6 hours
7H 7 hours7 hours
8H 8 hours8 hours
12H 12 hours12 hours
24H 24 hours24 hours
2D 2 days2 days
3D 3 days3 days
4D 4 days4 days
5D 5 days5 days
6D 6 days6 days
1W 1 week1 week
2W 2 weeks2 weeks
3W 3 weeks3 weeks
4W 4 weeks4 weeks
1L 1 months (30 days)1 months (30 days)
2L 2 months2 months
3L 3 months3 months
LU Life of the "unit"Life of the "unit" (for blood products).In a master file update for blood products, no specific duration value can be specified (see OM1-43 “Point Versus Interval” field definition).
PT point in timeTo identify measures at a point in time. This is a synonym for "spot" or "random" as applied to urine measurements.


2023-11-14reviseMarc DuteauTSMGAdd standard copyright and contact to internal content; up-476
2020-05-06reviseTed KleinVocabulary WGMigrated to the UTG maintenance environment and publishing tooling.