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Source1

{
  "resourceType": "CodeSystem",
  "id": "natureOfChallenge",
  "text": {
    "status": "generated",
    "div": "<!-- snip (see above) -->"
  },
  "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": "0257"
    }
  ],
  "url": "http://terminology.hl7.org/v2plusvocab/CodeSystem/natureOfChallenge",
  "identifier": [
    {
      "system": "urn:ietf:rfc:3986",
      "value": "urn:oid:2.16.840.1.113883.18.152"
    }
  ],
  "version": "1.0.0",
  "name": "NatureOfChallenge",
  "title": "Nature of Challenge (2.8.1 - 1.0.0)",
  "status": "active",
  "experimental": true,
  "date": "2026-01-27T19:45:38+00:00",
  "publisher": "HL7/FO",
  "contact": [
    {
      "name": "HL7/FO",
      "telecom": [
        {
          "system": "url",
          "value": "http://www.hl7.org"
        }
      ]
    }
  ],
  "description": "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.",
  "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": "CFST",
      "display": "Fasting (no calorie intake) for the period specified in the time component of the term, e.g., 1H POST CFST",
      "definition": "Fasting (no calorie intake) for the period specified in the time component of the term, e.g., 1H POST CFST",
      "property": [
        {
          "code": "versionIntroduced",
          "valueString": "2.3"
        }
      ]
    },
    {
      "code": "EXCZ",
      "display": "Exercise undertaken as challenge",
      "definition": "Exercise undertaken as challenge (can be quantified)",
      "property": [
        {
          "code": "comment",
          "valueString": "can be quantified"
        },
        {
          "code": "versionIntroduced",
          "valueString": "2.3"
        }
      ]
    },
    {
      "code": "FFST",
      "display": "No fluid intake for the period specified in the time component of the term",
      "definition": "No fluid intake for the period specified in the time component of the term",
      "property": [
        {
          "code": "versionIntroduced",
          "valueString": "2.3"
        }
      ]
    }
  ]
}