# Duration Categories (2.8.1 - 1.1.0) - HL7 v2.8.1 Vocabulary v0.2.0

* [**Table of Contents**](toc.md)
* [**Artifacts Summary**](artifacts.md)
* **Duration Categories (2.8.1 - 1.1.0)**

## CodeSystem: Duration Categories (2.8.1 - 1.1.0) (Experimental) 

| | |
| :--- | :--- |
| *Official URL*:http://terminology.hl7.org/v2plusvocab/CodeSystem/durationCategories | *Version*:1.1.0 |
| Active as of 2026-03-13 | *Computable Name*:DurationCategories |
| *Other Identifiers:*OID:2.16.840.1.113883.18.150, urn:ietf:rfc:3986#Uniform Resource Identifier (URI)#http://terminology.hl7.org/v2plusvocab/CodeSystem/v2-0255 | |
| **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](ValueSet-hl7VSdurationCategories.md)



## Resource Content

```json
{
  "resourceType" : "CodeSystem",
  "id" : "durationCategories",
  "extension" : [{
    "url" : "http://terminology.hl7.org/v2plusvocab/StructureDefinition/codesystem-v2versionCreated",
    "valueString" : "2.8.1"
  },
  {
    "url" : "http://terminology.hl7.org/v2plusvocab/StructureDefinition/codesystem-versionHistory",
    "valueString" : "generate correct history somehow"
  },
  {
    "url" : "http://terminology.hl7.org/v2plusvocab/StructureDefinition/codesystem-tableNo",
    "valueString" : "0255"
  }],
  "url" : "http://terminology.hl7.org/v2plusvocab/CodeSystem/durationCategories",
  "identifier" : [{
    "system" : "urn:ietf:rfc:3986",
    "value" : "urn:oid:2.16.840.1.113883.18.150"
  },
  {
    "system" : "urn:ietf:rfc:3986",
    "value" : "http://terminology.hl7.org/v2plusvocab/CodeSystem/v2-0255"
  }],
  "version" : "1.1.0",
  "name" : "DurationCategories",
  "title" : "Duration Categories (2.8.1 - 1.1.0)",
  "status" : "active",
  "experimental" : true,
  "date" : "2026-03-13T11:11:38+00:00",
  "publisher" : "HL7/FO",
  "contact" : [{
    "name" : "HL7/FO",
    "telecom" : [{
      "system" : "url",
      "value" : "http://www.hl7.org"
    }]
  }],
  "description" : "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.",
  "copyright" : "HL7 Inc., 2026",
  "caseSensitive" : true,
  "compositional" : false,
  "content" : "complete",
  "property" : [{
    "code" : "versionIntroduced",
    "uri" : "http://terminology.hl7.org/v2plusvocab/CodeSystem/Property#versionIntroduced",
    "description" : "version when was this code introduced",
    "type" : "string"
  },
  {
    "code" : "versionDeprecated",
    "uri" : "http://terminology.hl7.org/v2plusvocab/CodeSystem/Property#versionDeprecated",
    "description" : "version when was this code deprecated",
    "type" : "string"
  },
  {
    "code" : "status",
    "uri" : "http://hl7.org/fhir/concept-properties#status",
    "description" : "A code that indicates the status of the concept. Typical values are active, experimental, deprecated, and retired",
    "type" : "code"
  },
  {
    "code" : "comment",
    "uri" : "http://terminology.hl7.org/v2plusvocab/CodeSystem/Property#comment",
    "description" : "A string that provides additional detail pertinent to the use or understanding of the concept",
    "type" : "string"
  },
  {
    "code" : "usage",
    "uri" : "http://terminology.hl7.org/v2plusvocab/CodeSystem/Property#usage",
    "description" : "usage notes for this code",
    "type" : "string"
  },
  {
    "code" : "modified",
    "uri" : "http://terminology.hl7.org/v2plusvocab/CodeSystem/Property#modified",
    "description" : "date of last modification",
    "type" : "dateTime"
  }],
  "concept" : [{
    "code" : "*",
    "display" : "(asterisk) Life of the \"unit\"",
    "definition" : "(asterisk) Life of the \"unit\"",
    "property" : [{
      "code" : "comment",
      "valueString" : "Used for blood products."
    },
    {
      "code" : "versionIntroduced",
      "valueString" : "2.3"
    }]
  },
  {
    "code" : "12H",
    "display" : "12 hours",
    "definition" : "12 hours",
    "property" : [{
      "code" : "versionIntroduced",
      "valueString" : "2.3"
    }]
  },
  {
    "code" : "1H",
    "display" : "1 hour",
    "definition" : "1 hour",
    "property" : [{
      "code" : "versionIntroduced",
      "valueString" : "2.3"
    }]
  },
  {
    "code" : "1L",
    "display" : "1 months (30 days)",
    "definition" : "1 months (30 days)",
    "property" : [{
      "code" : "versionIntroduced",
      "valueString" : "2.3"
    }]
  },
  {
    "code" : "1W",
    "display" : "1 week",
    "definition" : "1 week",
    "property" : [{
      "code" : "versionIntroduced",
      "valueString" : "2.3"
    }]
  },
  {
    "code" : "2.5H",
    "display" : "2 1/2 hours",
    "definition" : "2 1/2 hours",
    "property" : [{
      "code" : "versionIntroduced",
      "valueString" : "2.3"
    }]
  },
  {
    "code" : "24H",
    "display" : "24 hours",
    "definition" : "24 hours",
    "property" : [{
      "code" : "versionIntroduced",
      "valueString" : "2.3"
    }]
  },
  {
    "code" : "2D",
    "display" : "2 days",
    "definition" : "2 days",
    "property" : [{
      "code" : "versionIntroduced",
      "valueString" : "2.3"
    }]
  },
  {
    "code" : "2H",
    "display" : "2 hours",
    "definition" : "2 hours",
    "property" : [{
      "code" : "versionIntroduced",
      "valueString" : "2.3"
    }]
  },
  {
    "code" : "2L",
    "display" : "2 months",
    "definition" : "2 months",
    "property" : [{
      "code" : "versionIntroduced",
      "valueString" : "2.3"
    }]
  },
  {
    "code" : "2W",
    "display" : "2 weeks",
    "definition" : "2 weeks",
    "property" : [{
      "code" : "versionIntroduced",
      "valueString" : "2.3"
    }]
  },
  {
    "code" : "30M",
    "display" : "30 minutes",
    "definition" : "30 minutes",
    "property" : [{
      "code" : "versionIntroduced",
      "valueString" : "2.3"
    }]
  },
  {
    "code" : "3D",
    "display" : "3 days",
    "definition" : "3 days",
    "property" : [{
      "code" : "versionIntroduced",
      "valueString" : "2.3"
    }]
  },
  {
    "code" : "3H",
    "display" : "3 hours",
    "definition" : "3 hours",
    "property" : [{
      "code" : "versionIntroduced",
      "valueString" : "2.3"
    }]
  },
  {
    "code" : "3L",
    "display" : "3 months",
    "definition" : "3 months",
    "property" : [{
      "code" : "versionIntroduced",
      "valueString" : "2.3"
    }]
  },
  {
    "code" : "3W",
    "display" : "3 weeks",
    "definition" : "3 weeks",
    "property" : [{
      "code" : "versionIntroduced",
      "valueString" : "2.3"
    }]
  },
  {
    "code" : "4D",
    "display" : "4 days",
    "definition" : "4 days",
    "property" : [{
      "code" : "versionIntroduced",
      "valueString" : "2.3"
    }]
  },
  {
    "code" : "4H",
    "display" : "4 hours",
    "definition" : "4 hours",
    "property" : [{
      "code" : "versionIntroduced",
      "valueString" : "2.3"
    }]
  },
  {
    "code" : "4W",
    "display" : "4 weeks",
    "definition" : "4 weeks",
    "property" : [{
      "code" : "versionIntroduced",
      "valueString" : "2.3"
    }]
  },
  {
    "code" : "5D",
    "display" : "5 days",
    "definition" : "5 days",
    "property" : [{
      "code" : "versionIntroduced",
      "valueString" : "2.3"
    }]
  },
  {
    "code" : "5H",
    "display" : "5 hours",
    "definition" : "5 hours",
    "property" : [{
      "code" : "versionIntroduced",
      "valueString" : "2.3"
    }]
  },
  {
    "code" : "6D",
    "display" : "6 days",
    "definition" : "6 days",
    "property" : [{
      "code" : "versionIntroduced",
      "valueString" : "2.3"
    }]
  },
  {
    "code" : "6H",
    "display" : "6 hours",
    "definition" : "6 hours",
    "property" : [{
      "code" : "versionIntroduced",
      "valueString" : "2.3"
    }]
  },
  {
    "code" : "7H",
    "display" : "7 hours",
    "definition" : "7 hours",
    "property" : [{
      "code" : "versionIntroduced",
      "valueString" : "2.3"
    }]
  },
  {
    "code" : "8H",
    "display" : "8 hours",
    "definition" : "8 hours",
    "property" : [{
      "code" : "versionIntroduced",
      "valueString" : "2.3"
    }]
  },
  {
    "code" : "PT",
    "display" : "point in time",
    "definition" : "To identify measures at a point in time.",
    "property" : [{
      "code" : "comment",
      "valueString" : "This is a synonym for \"spot\" or \"random\" as applied to urine measurements."
    },
    {
      "code" : "versionIntroduced",
      "valueString" : "2.3"
    }]
  }]
}

```
