Profile for capturing the relative lung function testings (i.e. an individual measurement divided by the corresponding reference value) as FHIR Observation resources.

This profile defines the exchange of a single relative value for the Mandatory Interoperable Value (MIV) "Lung Function Testing" which is technically defined by the ValueSet hddt-miv-lung-function-testing. This MIV is e.g. implemented by peak flow meter that can connect to a Personal Health Gateway (e.g. a mobile app for tracking lung function values) through wireless or wired communication.

Obligations and Conventions:

Each Lung Function Testing MAY either hold a reference to a Sensor Type And Calibration Status DeviceMetric resource or to a Personal Health Device Device resource (eXclusive OR). Typically the reference will be to a Device resource, but the option to reference a DeviceMetric resource is provided for compatibility with the overarching HDDT specification.

Each instance of this Observation MUST reference the Observations holding the corresponding raw measurement and reference value via the derivedFrom element.

Constraints applied:

• status is restricted to final
• code is constrained to a subset of the MIV Lung Function Relative Values ValueSet, defined by the HddtLungFunctionRelativeValues ValueSet.
• effective[x] is restricted to effectiveDateTime and constrained as mandatory.
• 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.
• derivedFrom is constrained to require exactly two references: one to the raw lung function testing Observation and one to the lung function reference value Observation.