See the full registry of value sets defined Clinical assessment tool example - GCS with individual scores as part of FHIR. related QuestionnaireAnswer

{
  "resourceType": "Observation",
  "id": "gcs-qa",
  "text": {
    "status": "generated",
    "div": "<div xmlns=\"http://www.w3.org/1999/xhtml\"><p><b>Generated Narrative: Observation</b><a name=\"gcs-qa\"> </a></p><div style=\"display: inline-block; background-color: #d9e0e7; padding: 6px; margin: 4px; border: 1px solid #8da1b4; border-radius: 5px; line-height: 60%\"><p style=\"margin-bottom: 0px\">Resource Observation &quot;gcs-qa&quot; </p></div><p><b>status</b>: <span title=\"   the mandatory quality flags:   \">final</span></p><p><b>code</b>: <span title=\"  \n    Observations are often coded in multiple code systems.\n      - LOINC\n\t\t- or SNOMED\n      -and/or the source system may provides its own &quot;local&quot; code, which may be less or more granular than LOINC.\n\tIn this example there is only LOINC\n    \">Glasgow Coma Scale , (GCS) <span style=\"background: LightGoldenRodYellow; margin: 4px; border: 1px solid khaki\"> (<a href=\"https://loinc.org/\">LOINC</a>#9269-2 &quot;Glasgow coma score total&quot;)</span></span></p><p><b>subject</b>: <a href=\"patient-example.html\">Patient/example: Peter James Chalmers</a> &quot;Peter CHALMERS&quot;</p><p><b>effective</b>: 2014-12-11T04:44:16Z</p><p><b>value</b>: <span title=\"   In FHIR, units may be represented twice. Once in the\n    agreed human representation, and once in a coded form.\n    In this example the UCUM unit is provided but no human representation since this is often not displayed\n     \">13 {score}<span style=\"background: LightGoldenRodYellow\"> (Details: UCUM code {score} = '{score}')</span></span></p><blockquote><p><b>referenceRange</b></p><p><b>high</b>: 8 {score}<span style=\"background: LightGoldenRodYellow\"> (Details: UCUM code {score} = '{score}')</span></p><p><b>type</b>: <span title=\"   meaning as text   \">Severe TBI <span style=\"background: LightGoldenRodYellow; margin: 4px; border: 1px solid khaki\"> ()</span></span></p></blockquote><blockquote><p><b>referenceRange</b></p><p><b>low</b>: 9 {score}<span style=\"background: LightGoldenRodYellow\"> (Details: UCUM code {score} = '{score}')</span></p><p><b>high</b>: 12 {score}<span style=\"background: LightGoldenRodYellow\"> (Details: UCUM code {score} = '{score}')</span></p><p><b>type</b>: <span title=\"   meaning as text   \">Moderate TBI <span style=\"background: LightGoldenRodYellow; margin: 4px; border: 1px solid khaki\"> ()</span></span></p></blockquote><blockquote><p><b>referenceRange</b></p><p><b>low</b>: 13 {score}<span style=\"background: LightGoldenRodYellow\"> (Details: UCUM code {score} = '{score}')</span></p><p><b>type</b>: <span title=\"   meaning as text   \">Mild TBI <span style=\"background: LightGoldenRodYellow; margin: 4px; border: 1px solid khaki\"> ()</span></span></p></blockquote><p><b>derivedFrom</b>: <span title=\"   put the references to the QuestionnairAnswer example here using the derived-From type    \"><a href=\"questionnaireresponse-example-gcs.html\">QuestionnaireResponse/gcs: GCS form results</a></span></p></div>"
  },
  "status": "final",
  "code": {
    "coding": [
      {
        "system": "http://loinc.org",
        "code": "9269-2",
        "display": "Glasgow coma score total"
      }
    ],
    "text": "Glasgow Coma Scale , (GCS)"
  },
  "subject": {
    "reference": "Patient/example",
    "display": "Peter James Chalmers"
  },
  "effectiveDateTime": "2014-12-11T04:44:16Z",
  "valueQuantity": {
    "value": 13,
    "system": "http://unitsofmeasure.org",
    "code": "{score}"
  },
  "referenceRange": [
    {
      "high": {
        "value": 8,
        "system": "http://unitsofmeasure.org",
        "code": "{score}"
      },
      "type": {
        "text": "Severe TBI"
      }
    },
    {
      "low": {
        "value": 9,
        "system": "http://unitsofmeasure.org",
        "code": "{score}"
      },
      "high": {
        "value": 12,
        "system": "http://unitsofmeasure.org",
        "code": "{score}"
      },
      "type": {
        "text": "Moderate TBI"
      }
    },
    {
      "low": {
        "value": 13,
        "system": "http://unitsofmeasure.org",
        "code": "{score}"
      },
      "type": {
        "text": "Mild TBI"
      }
    }
  ],
  "derivedFrom": [
    {
      "reference": "QuestionnaireResponse/gcs",
      "display": "GCS form results"
    }
  ]
}