💡 [REQUEST] - Clarification on dosage dose UCUM as UOM - ANFISK-334

Target Date

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Implementation PR

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Reference Issues

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Summary

Need to clarify if other code systems besides UCUM should be allowed for MedicationAdministration.dosage.dose and Dosage.doseAndRate.doseQuantity for MedicationRequest and MedicationStatement.

ISiK-3 has Quantity.system = http://unitsofmeasure.org. Should other code systems be allowed for concepts like Tablet from EDQM? ISiK-4 introduces the Quantity data type profile Medication Quantity which mentions SNOMED as an alternative to UCUM. But Quantity.system is still set to UCUM. This could this be a use case for http://hl7.org/fhir/R4/extension-iso21090-pq-translation.html

Common Examples

Use case of a Medication with a form:

    "form": {
        "coding":  [
            {
                "code": "10219000",
                "system": "http://standardterms.edqm.eu",
                "display": "Tablet"
            }
        ]
    },

should it be possible to have a MedicationAdministration of that Medication with:

  "dosage": {
    "dose": {
      "system": "http://standardterms.edqm.eu",
      "value": 1,
      "code": "10219000",
      "unit": "Tablet"
    }
  }

Drawbacks

Adds extra complexity when different code systems are allowed. US Core is UCUM only: https://build.fhir.org/ig/HL7/US-Core/StructureDefinition-us-core-medicationrequest.html

Unadressed questions

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gematik / spec-ISiK-Medikation