{
  "resourceType": "SearchParameter",
  "id": "Observation-based-on",
  "url": "http://hl7.org/fhir/SearchParameter/Observation-based-on",
  "name": "based-on",
  "status": "draft",
  "experimental": false,
  "publisher": "Health Level Seven International (Orders and Observations)",
  "contact": [
    {
      "telecom": [
        {
          "system": "url",
          "value": "http://hl7.org/fhir"
        }
      ]
    },
    {
      "telecom": [
        {
          "system": "url",
          "value": "http://www.hl7.org/Special/committees/orders/index.cfm"
        }
      ]
    }
  ],
  "code": "based-on",
  "base": [
    "Observation"
  ],
  "type": "reference",
  "description": "Reference to the test or procedure request.",
  "expression": "Observation.basedOn",
  "xpath": "f:Observation/f:basedOn",
  "xpathUsage": "normal",
  "target": [
    "ReferralRequest",
    "CarePlan",
    "MedicationRequest",
    "NutritionOrder",
    "ProcedureRequest",
    "DeviceRequest",
    "ImmunizationRecommendation"
  ]
}