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Mobile Health Data

Mobile Health Data with Spezi

This section provides comprehensive guidance on representing mobile health data using the Spezi framework and FHIR standards. Mobile health applications generate vast amounts of health data from various sources including device sensors, user inputs, and wearables. The Spezi framework provides standardized approaches for collecting, transforming, and representing this data using HL7 FHIR resources.

Data Collection

On iOS platforms, Spezi applications leverage the HealthKitOnFHIR library in combination with SpeziHealthKit to serialize HealthKit data into FHIR Observations.

FHIR Observation Structure

HealthKitOnFHIR converts HealthKit samples to FHIR Observations using this structure:

{
  "resourceType": "Observation",
  "id": "spezi-healthkit-steps-example",
  "status": "final",
  "category": [
    {
      "coding": [
        {
          "system": "http://terminology.hl7.org/CodeSystem/observation-category",
          "code": "survey"
        }
      ]
    }
  ],
  "code": {
    "coding": [
      {
        "system": "http://loinc.org",
        "code": "55423-8",
        "display": "Number of steps"
      }
    ]
  },
  "subject": {
    "reference": "Patient/example-patient"
  },
  "effectiveDateTime": "2024-01-15T10:30:00Z",
  "valueQuantity": {
    "value": 8542,
    "unit": "steps",
    "system": "http://unitsofmeasure.org",
    "code": "{steps}"
  },
  "device": {
    "display": "iPhone Health App"
  }
}

HealthKit Terminology Mapping Table