description: Profile for capturing blood glucose measurements as FHIR Observation resources.\n\nThis profile defines the exchange of a single measurement data for the Mandatory Interoperable Value (MIV) \\\"Blood Glucose Measurement\\\" which is technically defined \nby the ValueSet _hddt-miv-blood-glucose-measurement_. This MIV is e.g. implemented by blood glucose meter (glucometer) that can connect to \na Personal Health Gateway (e.g. a mobile app for keeping diabetes diary) through wireless or wired communication.\n\n**Obligations and Conventions:**\n\nEach Blood Glucose Measurement MUST either hold a reference to a _Sensor Type And Calibration Status_ [DeviceMetric](https://hl7.org/fhir/R4/devicemetric.html) resource or to a \n_Personal Health Device_ [Device](https://hl7.org/fhir/R4/device.html) resource (eXclusive OR). A reference to _Sensor Type And Calibration Status_ MUST be provided \nfrom the Observation resource if the sensor for measuring blood glucose needs to be calibrated (either automatically or by the user) \nor if the sensor may change its calibration status over time. \n\n**Constraints applied:**  \n- `status` is restricted to _final_\n- `code` is constrained to the ValueSet that represents the MIV _Blood Glucose Measurement_\n- `effective[x]` is restricted to `effectiveDateTime` and constrained as mandatory.\n- `value[x]` is restricted to `valueQuantity`. The elements `valueQuantity.value`, `valueQuantity.system`, and `valueQuantity.code` are constrained in a way that a value MUST be provided and that UCUM MUST be used for encoding the unit of measurement. `Observation.valueQuantity` MAY only be omitted in case of an error that accured with the measurement. In this case, `Observation.dataAbsentReason` MUST be provided.\n- `device` is set to be mandatory in order to provide the DiGA with information about the sensor's calibration status and with information about the static and dynamic attributes of the Personal Health Device.
package_name: de.gematik.hddt
derivation: constraint
name: HddtBloodGlucoseMeasurement
type: Observation
elements:
  status:
    short: Measurement status
    pattern: {type: Code, value: final}
    index: 0
  code:
    short: Measurement type of blood glucose
    binding: {strength: required, valueSet: 'https://gematik.de/fhir/hddt/ValueSet/hddt-miv-blood-glucose-measurement'}
    index: 1
  effective:
    short: Time of measurement
    choices: [effectiveDateTime]
    index: 3
  effectiveDateTime: {type: dateTime, short: Time of measurement, choiceOf: effective, index: 4}
  value:
    short: Measured blood glucose value
    mustSupport: true
    choices: [valueQuantity]
    index: 6
  valueQuantity: {type: Quantity, short: Measured blood glucose value, mustSupport: true, choiceOf: value, index: 7}
  value[x]:
    elements:
      value: {index: 8}
      system:
        pattern: {type: Uri, value: 'http://unitsofmeasure.org'}
        index: 9
      code:
        binding: {strength: required, valueSet: 'http://hl7.org/fhir/ValueSet/ucum-units'}
        index: 10
    required: [value, system, code]
  device:
    type: Reference
    short: Reference to personal health device or its sensor type and calibration status
    refers: ['https://gematik.de/fhir/hddt/StructureDefinition/hddt-personal-health-device', 'https://gematik.de/fhir/hddt/StructureDefinition/hddt-sensor-type-and-calibration-status']
    index: 11
package_version: 1.0.0-rc2
class: profile
kind: resource
url: https://gematik.de/fhir/hddt/StructureDefinition/hddt-blood-glucose-measurement
base: http://hl7.org/fhir/StructureDefinition/Observation
version: 1.0.0-rc2
required: [device, effectiveDateTime, effective]