FHIR IG Statistics: StructureDefinition/DataStandardsWales-Observation-VitalSigns-BMI

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{
  "resourceType": "StructureDefinition",
  "id": "DataStandardsWales-Observation-VitalSigns-BMI",
  "url": "https://fhir.nhs.wales/StructureDefinition/DataStandardsWales-Observation-VitalSigns-BMI",
  "version": "1.0.0",
  "name": "DataStandardsWalesObservationVitalSignsBMI",
  "title": "Data Standards Wales Observation Vital Signs BMI",
  "status": "draft",
  "date": "2025-01-01",
  "publisher": "NHS Wales",
  "contact": [
    {
      "name": "NHS Wales",
      "telecom": [
        {
          "system": "email",
          "value": "fhir.standards@wales.nhs.uk",
          "use": "work",
          "rank": 1
        }
      ]
    }
  ],
  "description": "Resource structure is based on UKCore-Observation-BMI v1.0.0 which is not yet included in a balloted release. Added manually to prevent structure deviation and to support NHS Wales projects. Once available, the resource will be updated and derived from UK Core. Defines the additional constraints and extensions on the Data Standards Wales Observation Vital Signs profile",
  "purpose": "To provide implementers with additional support when implementing measuring and recording body mass index and to provide a consistent structure to how the data is presented.",
  "copyright": "2025 NHS Wales",
  "fhirVersion": "4.0.1",
  "kind": "resource",
  "abstract": false,
  "type": "Observation",
  "baseDefinition": "https://fhir.nhs.wales/StructureDefinition/DataStandardsWales-Observation-VitalSigns",
  "derivation": "constraint",
  "differential": {
    "element": [
      {
        "id": "Observation.code.coding:loinc",
        "path": "Observation.code.coding",
        "sliceName": "loinc"
      },
      {
        "id": "Observation.code.coding:loinc.code",
        "path": "Observation.code.coding.code",
        "fixedCode": "39156-5"
      },
      {
        "id": "Observation.code.coding:snomedCT",
        "path": "Observation.code.coding",
        "sliceName": "snomedCT",
        "min": 1,
        "max": "1",
        "binding": {
          "strength": "preferred",
          "valueSet": "https://fhir.nhs.wales/ValueSet/DSW-BMI"
        }
      },
      {
        "id": "Observation.code.coding:snomedCT.system",
        "path": "Observation.code.coding.system",
        "min": 1
      },
      {
        "id": "Observation.code.coding:snomedCT.code",
        "path": "Observation.code.coding.code",
        "min": 1
      },
      {
        "id": "Observation.subject",
        "path": "Observation.subject",
        "type": [
          {
            "code": "Reference",
            "targetProfile": [
              "https://fhir.nhs.wales/StructureDefinition/DataStandardsWales-Patient",
              "https://fhir.nhs.wales/StructureDefinition/DataStandardsWales-Location",
              "https://fhir.nhs.wales/StructureDefinition/DataStandardsWales-Device",
              "http://hl7.org/fhir/StructureDefinition/Group"
            ]
          }
        ]
      },
      {
        "id": "Observation.value[x]",
        "path": "Observation.value[x]",
        "min": 1,
        "type": [
          {
            "code": "Quantity"
          }
        ]
      },
      {
        "id": "Observation.value[x].value",
        "path": "Observation.value[x].value",
        "min": 1
      },
      {
        "id": "Observation.value[x].system",
        "path": "Observation.value[x].system",
        "min": 1,
        "fixedUri": "http://unitsofmeasure.org"
      },
      {
        "id": "Observation.value[x].code",
        "path": "Observation.value[x].code",
        "min": 1,
        "fixedCode": "kg/m2"
      },
      {
        "id": "Observation.note.author[x]",
        "path": "Observation.note.author[x]",
        "type": [
          {
            "code": "Reference",
            "targetProfile": [
              "https://fhir.nhs.wales/StructureDefinition/DataStandardsWales-Organization",
              "https://fhir.nhs.wales/StructureDefinition/DataStandardsWales-Patient",
              "https://fhir.nhs.wales/StructureDefinition/DataStandardsWales-Practitioner",
              "https://fhir.nhs.wales/StructureDefinition/Profile-DataStandardsWales-RelatedPerson"
            ]
          },
          {
            "code": "string"
          }
        ]
      }
    ]
  }
}