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: Nature of Challenge (2.5.1 - 1.0.0) (Experimental)

Official URL: http://terminology.hl7.org/v2plusvocab/CodeSystem/natureOfChallenge Version: 1.0.0
Active as of 2026-01-27 Computable Name: NatureOfChallenge
Other Identifiers: OID:2.16.840.1.113883.18.152

Copyright/Legal: HL7 Inc., 2026

HL7-defined code system of concepts used to further describe an observation definition that is characterized as a challenge observation. 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:

Properties

This code system defines the following properties for its concepts

NameCodeURITypeDescription
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/natureOfChallenge defines the following codes:

CodeDisplayDefinitionversionIntroducedcomment
CFST Fasting (no calorie intake) for the period specified in the time component of the term, e.g., 1H POST CFST Fasting (no calorie intake) for the period specified in the time component of the term, e.g., 1H POST CFST 2.3
EXCZ Exercise undertaken as challenge Exercise undertaken as challenge (can be quantified) 2.3 can be quantified
FFST No fluid intake for the period specified in the time component of the term No fluid intake for the period specified in the time component of the term 2.3