Observations / Lab Results

Lab results and measurements are represented by the FHIR R4 Observation resource.

Retrieving Observations

Observations can be retrieved through a search on the Observation resource:

GET <TENANT_BASE_URL>/fhir/R4/Patient/<PATIENT_ID>/Observation

Required parameters

• code
  The diagnostic code to retrieve observations for. Must use the NHG Table 45 system:
  https://referentiemodel.nhg.org/tabellen/nhg-tabel-45-diagnostische-bepalingen|<CODE>
  To retrieve all observations, use the bare system prefix without a code value:
  https://referentiemodel.nhg.org/tabellen/nhg-tabel-45-diagnostische-bepalingen|

Optional parameters

• category
  Filter by observation category.
  For example, to retrieve only laboratory results:
  http://hl7.org/fhir/observation-category|laboratory
• date
  Filter by date. Supports ge (greater-than-or-equal) and le (less-than-or-equal) modifiers.
  For example, date=ge2025-01-01&date=le2025-12-31 retrieves observations from 2025.

Notes

• Retrieval of a single observation by ID (/Observation/<ID>) is not yet implemented.