{
  "resourceType": "StructureDefinition",
  "id": "ncdhc-observation-vitalsign-bmi",
  "url": "http://hl7.org.au/fhir/ch/v1/StructureDefinition/ncdhc-observation-vitalsign-bmi",
  "version": "r1.0.0",
  "name": "NCDHC BMI Vital Sign Profile",
  "title": "NCDHC BMI Vital Sign",
  "status": "draft",
  "date": "2019-02-15",
  "publisher": "National Children's Digital Health Collaborative (NCDHC)",
  "description": "NCDHC Body Mass Index (BMI) Profile",
  "fhirVersion": "3.0.2",
  "kind": "resource",
  "abstract": false,
  "type": "Observation",
  "baseDefinition": "http://hl7.org/fhir/StructureDefinition/bmi",
  "derivation": "constraint",
  "differential": {
    "element": [
      {
        "id": "Observation",
        "path": "Observation",
        "short": "NCDHC Body Mass Index (BMI) Profile",
        "definition": "This profile defines  how to represent Head Circumference observations in FHIR using a standard LOINC and SNOMED CT AU code. The profile uses UCUM units of measure."
      },
      {
        "id": "Observation.code",
        "path": "Observation.code",
        "short": "Required BMI code"
      },
      {
        "id": "Observation.code.coding:BMICode",
        "path": "Observation.code.coding",
        "sliceName": "BMICode",
        "min": 1,
        "max": "1"
      },
      {
        "id": "Observation.code.coding:BMISNOMEDCTAU",
        "path": "Observation.code.coding",
        "sliceName": "BMISNOMEDCTAU",
        "min": 0,
        "max": "1",
        "fixedCoding": {
          "system": "http://snomed.info/sct",
          "code": "60621009"
        }
      },
      {
        "id": "Observation.code.coding:BMISNOMEDCTAU.system",
        "path": "Observation.code.coding.system",
        "fixedUri": "http://snomed.info/sct"
      },
      {
        "id": "Observation.code.coding:BMISNOMEDCTAU.code",
        "path": "Observation.code.coding.code",
        "fixedCode": "60621009"
      },
      {
        "id": "Observation.subject",
        "path": "Observation.subject",
        "type": [
          {
            "code": "Reference",
            "targetProfile": "http://hl7.org.au/fhir/ch/v1/StructureDefinition/ncdhc-patient-baby"
          }
        ]
      },
      {
        "id": "Observation.performer",
        "path": "Observation.performer",
        "min": 1,
        "type": [
          {
            "code": "Reference",
            "targetProfile": "http://hl7.org.au/fhir/StructureDefinition/au-practitioner"
          },
          {
            "code": "Reference",
            "targetProfile": "http://hl7.org.au/fhir/StructureDefinition/au-organisation"
          }
        ]
      },
      {
        "id": "Observation.valueQuantity:valueQuantity",
        "path": "Observation.valueQuantity",
        "sliceName": "valueQuantity"
      },
      {
        "id": "Observation.interpretation",
        "path": "Observation.interpretation",
        "short": "Normal | Review | Refer",
        "binding": {
          "strength": "required",
          "valueSetReference": {
            "reference": "http://hl7.org.au/fhir/ch/v1/ValueSet/ncdhc-observation-interpretation-1"
          }
        }
      },
      {
        "id": "Observation.comment",
        "path": "Observation.comment",
        "short": "Additional Comments"
      },
      {
        "id": "Observation.component.valueQuantity:valueQuantity",
        "path": "Observation.component.valueQuantity",
        "sliceName": "valueQuantity"
      }
    ]
  }
}