Personal Health Device Implementation Guide
current - CI Build

Personal Health Device Implementation Guide, published by HL7 International - Health Care Devices Work Group. This is not an authorized publication; it is the continuous build for version current). This version is based on the current content of https://github.com/HL7/PHD/ and changes regularly. See the Directory of published versions

General Notes to Consumers of FHIR Data

A consumer of the PHD profile resources will find most of the mapping is as expected if they are familiar with the Patient, Device, and Observation resources. Though the spectrum of PHDs is extensive, the generic modeling approach results in a similar set of elements being used in all cases, simplifying the reading task for the consumer. For example, the following elements are all that is needed to obtain the information for most measurements:

Resource element Meaning
Observation .code Tells what the measurement is
Observation .effectiveDateTime Tells when the measurement was taken
  .effectivePeriod  
Observation .valueQuantity.value Gives the value of the measurement if a number
  .valueCodeableConcept Gives the value of the measurement if a code
  .valueSampledData Gives the values when the measurements are a periodic sequence
  value absent with dataAbsentReason value has an error
  value absent with no dataAbsentReason indicates the measurement is a vector or set of binary (set/cleared) events or states and is found in component elements
Observation .interpretation.value Gives some special conditions about the overall measurement that are not ‘complete’ errors such as ‘questionable’. Infrequent.
Observation .component.code Tells what the individual vector sub-value is or event/state is
  .component.valueQuantity gives the sub value when the measurement is a vector
  component.valueCodeableConcept gives whether the event or state is set or cleared
  sub-value absent a dataAbsentReason is present indicating the sub value is in error or the event/state is unsupported
  component.interpretation Gives some special conditions about the measurement sub-value that are not ‘complete’ errors such as ‘questionable’. Infrequent.