EvidenceVariable resource (FHIR R4)

EvidenceVariable is the FHIR R4 resource for the EvidenceVariable resource describes a "PICO" element that knowledge (evidence, assertion, recommendation) is about.

Resource	EvidenceVariable
FHIR version	R4 (4.0.1)
Canonical URL	http://hl7.org/fhir/StructureDefinition/EvidenceVariable
Required elements	status (1..1), characteristic (1..*)

Example

{
  "resourceType": "EvidenceVariable",
  "id": "evidencevariable-3603a293c76ecd5a72151f1946e0f935",
  "status": "draft",
  "characteristic": [
    {
      "definitionReference": {
        "reference": "Group/group-4d1e19f1efe16a12d8d522b0a3cc05ca"
      }
    }
  ]
}

Generated by the Pidgeon engine: pidgeon generate EvidenceVariable --seed 20260722.

Validation context

strict pidgeon validate grades a EvidenceVariable instance against the base R4 structure definition: missing required elements raise REQUIRED_FIELD_MISSING and cardinality violations raise CARDINALITY_MIN or CARDINALITY_MAX.(REQUIRED_FIELD_MISSING)

This answer, in your terminal

pidgeon lookup EvidenceVariable

Wire it into your AI agent:

claude mcp add pidgeon -- npx -y @pidgeonhealth/mcp

Download Post free to browse this reference with generation attached.