HL7 v2.5.1 Vocabulary
0.1.0 - ci-build

HL7 v2.5.1 Vocabulary, published by HL7/FO. This guide is not an authorized publication; it is the continuous build for version 0.1.0 built by the FHIR (HL7® FHIR® Standard) CI Build. This version is based on the current content of https://github.com/frankoemig/hl7.v2.terminology.v251/ and changes regularly. See the Directory of published versions

## CodeSystem: Duration Categories (2.5.1 - 1.1.0) (Experimental)

Official URL: http://terminology.hl7.org/v2plusvocab/CodeSystem/durationCategories | Version: 1.1.0
Active as of 2026-01-27 | Computable Name: DurationCategories
Other Identifiers: OID:2.16.840.1.113883.18.150
Copyright/Legal: HL7 Inc., 2026

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.

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

- Hl7VSdurationCategories

Properties

This code system defines the following properties for its concepts

Name | Code | URI | Type | Description
versionIntroduced | versionIntroduced | http://terminology.hl7.org/v2plusvocab/CodeSystem/Property#versionIntroduced | string | version when was this code introduced
versionDeprecated | versionDeprecated | http://terminology.hl7.org/v2plusvocab/CodeSystem/Property#versionDeprecated | string | version when was this code deprecated
status | status | http://hl7.org/fhir/concept-properties#status | code | A code that indicates the status of the concept. Typical values are active, experimental, deprecated, and retired
comment | comment | http://terminology.hl7.org/v2plusvocab/CodeSystem/Property#comment | string | A string that provides additional detail pertinent to the use or understanding of the concept
usage | usage | http://terminology.hl7.org/v2plusvocab/CodeSystem/Property#usage | string | usage notes for this code
modified | modified | http://terminology.hl7.org/v2plusvocab/CodeSystem/Property#modified | dateTime | date of last modification

Concepts

This case-sensitive code system `http://terminology.hl7.org/v2plusvocab/CodeSystem/durationCategories` defines the following codes:

Code | Display | Definition | versionIntroduced | comment
* | (asterisk) Life of the "unit" | (asterisk) Life of the "unit" | 2.3 | Used for blood products.
12H | 12 hours | 12 hours | 2.3 |
1H | 1 hour | 1 hour | 2.3 |
1L | 1 months (30 days) | 1 months (30 days) | 2.3 |
1W | 1 week | 1 week | 2.3 |
2.5H | 2 1/2 hours | 2 1/2 hours | 2.3 |
24H | 24 hours | 24 hours | 2.3 |
2D | 2 days | 2 days | 2.3 |
2H | 2 hours | 2 hours | 2.3 |
2L | 2 months | 2 months | 2.3 |
2W | 2 weeks | 2 weeks | 2.3 |
30M | 30 minutes | 30 minutes | 2.3 |
3D | 3 days | 3 days | 2.3 |
3H | 3 hours | 3 hours | 2.3 |
3L | 3 months | 3 months | 2.3 |
3W | 3 weeks | 3 weeks | 2.3 |
4D | 4 days | 4 days | 2.3 |
4H | 4 hours | 4 hours | 2.3 |
4W | 4 weeks | 4 weeks | 2.3 |
5D | 5 days | 5 days | 2.3 |
5H | 5 hours | 5 hours | 2.3 |
6D | 6 days | 6 days | 2.3 |
6H | 6 hours | 6 hours | 2.3 |
7H | 7 hours | 7 hours | 2.3 |
8H | 8 hours | 8 hours | 2.3 |
PT | point in time | To identify measures at a point in time. | 2.3 | This is a synonym for "spot" or "random" as applied to urine measurements.