{
  "resourceType": "StructureDefinition",
  "id": "UKCore-Observation-VitalSigns-BloodPressure",
  "url": "https://fhir.hl7.org.uk/StructureDefinition/UKCore-Observation-VitalSigns-BloodPressure",
  "version": "1.0.0",
  "name": "UKCoreObservationVitalSignsBloodPressure",
  "title": "UK Core Observation Vital Signs Blood Pressure",
  "status": "draft",
  "date": "2023-08-10",
  "publisher": "HL7 UK",
  "contact": [
    {
      "name": "HL7 UK",
      "telecom": [
        {
          "system": "email",
          "value": "ukcore@hl7.org.uk",
          "use": "work",
          "rank": 1
        }
      ]
    }
  ],
  "description": "Defines the constraints and extensions on the UK Core Profile Observation",
  "purpose": "To provide implementers with additional support when implementing blood pressure monitoring and to provide a consistent structure to how the data is presented.",
  "fhirVersion": "4.0.1",
  "kind": "resource",
  "abstract": false,
  "type": "Observation",
  "baseDefinition": "https://fhir.hl7.org.uk/StructureDefinition/UKCore-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": "85354-9"
      },
      {
        "id": "Observation.code.coding:loinc.display",
        "path": "Observation.code.coding.display",
        "fixedString": "Blood pressure panel with all children optional"
      },
      {
        "id": "Observation.code.coding:snomedCT",
        "path": "Observation.code.coding",
        "sliceName": "snomedCT"
      },
      {
        "id": "Observation.code.coding:snomedCT.code",
        "path": "Observation.code.coding.code",
        "fixedCode": "75367002"
      },
      {
        "id": "Observation.code.coding:snomedCT.display",
        "path": "Observation.code.coding.display",
        "fixedString": "Blood pressure"
      },
      {
        "id": "Observation.value[x]",
        "path": "Observation.value[x]",
        "max": "0"
      },
      {
        "id": "Observation.component",
        "path": "Observation.component",
        "slicing": {
          "discriminator": [
            {
              "type": "value",
              "path": "code.text"
            }
          ],
          "rules": "closed"
        },
        "min": 2,
        "max": "2"
      },
      {
        "id": "Observation.component:SystolicBP",
        "path": "Observation.component",
        "sliceName": "SystolicBP",
        "min": 1,
        "max": "1"
      },
      {
        "id": "Observation.component:SystolicBP.code.coding",
        "path": "Observation.component.code.coding",
        "slicing": {
          "discriminator": [
            {
              "type": "value",
              "path": "system"
            }
          ],
          "rules": "open"
        }
      },
      {
        "id": "Observation.component:SystolicBP.code.coding:loinc",
        "path": "Observation.component.code.coding",
        "sliceName": "loinc"
      },
      {
        "id": "Observation.component:SystolicBP.code.coding:loinc.code",
        "path": "Observation.component.code.coding.code",
        "fixedCode": "8480-6"
      },
      {
        "id": "Observation.component:SystolicBP.code.coding:loinc.display",
        "path": "Observation.component.code.coding.display",
        "fixedString": "Systolic blood pressure"
      },
      {
        "id": "Observation.component:SystolicBP.code.coding:snomedCT",
        "path": "Observation.component.code.coding",
        "sliceName": "snomedCT",
        "binding": {
          "strength": "required",
          "valueSet": "https://fhir.hl7.org.uk/ValueSet/UKCore-BloodPressure-Systolic"
        }
      },
      {
        "id": "Observation.component:SystolicBP.code.text",
        "path": "Observation.component.code.text",
        "fixedString": "Systolic blood pressure"
      },
      {
        "id": "Observation.component:SystolicBP.value[x]",
        "path": "Observation.component.value[x]",
        "type": [
          {
            "code": "Quantity"
          }
        ]
      },
      {
        "id": "Observation.component:SystolicBP.value[x].unit",
        "path": "Observation.component.value[x].unit",
        "fixedString": "millimeter of mercury"
      },
      {
        "id": "Observation.component:SystolicBP.value[x].system",
        "path": "Observation.component.value[x].system",
        "fixedUri": "http://unitsofmeasure.org"
      },
      {
        "id": "Observation.component:SystolicBP.value[x].code",
        "path": "Observation.component.value[x].code",
        "fixedCode": "mm[Hg]"
      },
      {
        "id": "Observation.component:DiastolicBP",
        "path": "Observation.component",
        "sliceName": "DiastolicBP",
        "min": 1,
        "max": "1"
      },
      {
        "id": "Observation.component:DiastolicBP.code.coding",
        "path": "Observation.component.code.coding",
        "slicing": {
          "discriminator": [
            {
              "type": "value",
              "path": "system"
            }
          ],
          "rules": "open"
        }
      },
      {
        "id": "Observation.component:DiastolicBP.code.coding:loinc",
        "path": "Observation.component.code.coding",
        "sliceName": "loinc"
      },
      {
        "id": "Observation.component:DiastolicBP.code.coding:loinc.code",
        "path": "Observation.component.code.coding.code",
        "fixedCode": "8462-4"
      },
      {
        "id": "Observation.component:DiastolicBP.code.coding:loinc.display",
        "path": "Observation.component.code.coding.display",
        "fixedString": "Diastolic blood pressure"
      },
      {
        "id": "Observation.component:DiastolicBP.code.coding:snomedCT",
        "path": "Observation.component.code.coding",
        "sliceName": "snomedCT",
        "binding": {
          "strength": "required",
          "valueSet": "https://fhir.hl7.org.uk/ValueSet/UKCore-BloodPressure-Diastolic"
        }
      },
      {
        "id": "Observation.component:DiastolicBP.code.text",
        "path": "Observation.component.code.text",
        "fixedString": "Diastolic blood pressure"
      },
      {
        "id": "Observation.component:DiastolicBP.value[x]",
        "path": "Observation.component.value[x]",
        "type": [
          {
            "code": "Quantity"
          }
        ]
      },
      {
        "id": "Observation.component:DiastolicBP.value[x].unit",
        "path": "Observation.component.value[x].unit",
        "fixedString": "millimeter of mercury"
      },
      {
        "id": "Observation.component:DiastolicBP.value[x].system",
        "path": "Observation.component.value[x].system",
        "fixedUri": "http://unitsofmeasure.org"
      },
      {
        "id": "Observation.component:DiastolicBP.value[x].code",
        "path": "Observation.component.value[x].code",
        "fixedCode": "mm[Hg]"
      }
    ]
  }
}