Built on the standards health systems already speak.

FHIR R4 endpoints

• GET /fhir/metadata
• GET /fhir/Location
• GET /fhir/Observation?subject=Location/giofyros-1
• GET /fhir/RiskAssessment?location=Location/giofyros-1
• GET /fhir/RiskAssessment/risk-giofyros-1-waterborne
• GET /fhir/Group/cohort-giofyros-1
• GET /fhir/Observation/health-giofyros-1-gastrointestinal
• GET /fhir/Provenance?target=Observation/obs-1
• GET /fhir/CodeSystem/flow-state
• POST /fhir (transaction Bundle of OAH Observations)

CDS Hooks 2.0

• GET /cds-services
• POST /cds-services/streamreach-stream-exposure
• POST /cds-services/streamreach-stream-exposure/feedback

Register the discovery URL in any CDS Hooks client, for example the public CDS Hooks sandbox. Uses prefetch when the EHR provides it and otherwise queries the EHR's fhirServer. Returns at most two cards, with override reasons and feedback.

{
  "services": [
    {
      "hook": "patient-view",
      "id": "streamreach-stream-exposure",
      "title": "StreamReach: urban stream exposure risk",
      "description": "Warns when a patient lives near an urban stream with elevated waterborne-pathogen, toxic-algae or mosquito-borne risk (OneAquaHealth citizen science + weather forecast). Links matching symptoms to likely exposures and suggests work-up.",
      "prefetch": {
        "patient": "Patient/{{context.patientId}}",
        "conditions": "Condition?patient={{context.patientId}}"
      },
      "usageRequirements": "Patient.address should carry the FHIR geolocation extension or a city. Feedback on the 'report' suggestion shares an anonymous, reach-level count and never the patient identity."
    }
  ]
}