Example of observationdefinition for Creatine Kinase panel with multiple components

{
  "resourceType" : "ObservationDefinition",
  "id" : "example-ck-panel",
  "extension" : [{
    "url" : "http://hl7.org/fhir/StructureDefinition/structuredefinition-wg",
    "valueCode" : "oo"
  }],
  "status" : "active",
  "publisher" : "HL7 International / Orders and Observations",
  "contact" : [{
    "telecom" : [{
      "system" : "url",
      "value" : "http://www.hl7.org/Special/committees/orders"
    }]
  }],
  "category" : [{
    "coding" : [{
      "system" : "http://terminology.hl7.org/CodeSystem/observation-category",
      "code" : "laboratory",
      "display" : "Laboratory"
    }]
  }],
  "code" : {
    "coding" : [{
      "system" : "http://loinc.org",
      "code" : "32673-6",
      "display" : "Creatine kinase.MB [Enzymatic activity/volume] in Serum or Plasma"
    }],
    "text" : "Creatine Kinase Panel"
  },
  "permittedDataType" : ["Quantity"],
  "multipleResultsAllowed" : true,
  "preferredReportName" : "Creatine Kinase, MB and Relative Percent",
  "qualifiedValue" : [{
    "context" : {
      "coding" : [{
        "system" : "http://terminology.hl7.org/CodeSystem/referencerange-meaning",
        "code" : "normal",
        "display" : "Normal Range"
      }]
    },
    "rangeCategory" : "reference"
  }],
  "component" : [{
    "code" : {
      "coding" : [{
        "system" : "http://loinc.org",
        "code" : "2157-6",
        "display" : "Creatine kinase [Enzymatic activity/volume] in Serum or Plasma"
      }],
      "text" : "Creatine Kinase, Total"
    },
    "permittedDataType" : ["Quantity"],
    "permittedUnit" : [{
      "system" : "http://unitsofmeasure.org",
      "code" : "U/L",
      "display" : "U/L"
    }],
    "qualifiedValue" : [{
      "context" : {
        "coding" : [{
          "system" : "http://terminology.hl7.org/CodeSystem/referencerange-meaning",
          "code" : "normal",
          "display" : "Normal Range"
        }]
      },
      "rangeCategory" : "reference",
      "range" : {
        "low" : {
          "value" : 39,
          "unit" : "U/L",
          "system" : "http://unitsofmeasure.org",
          "code" : "U/L"
        },
        "high" : {
          "value" : 308,
          "unit" : "U/L",
          "system" : "http://unitsofmeasure.org",
          "code" : "U/L"
        }
      }
    }]
  },
  {
    "code" : {
      "coding" : [{
        "system" : "http://loinc.org",
        "code" : "13969-1",
        "display" : "Creatine kinase.MB [Mass/volume] in Serum or Plasma"
      }],
      "text" : "Creatine Kinase, Isoenzyme MB"
    },
    "permittedDataType" : ["Quantity"],
    "permittedUnit" : [{
      "system" : "http://unitsofmeasure.org",
      "code" : "ng/mL",
      "display" : "ng/mL"
    }],
    "qualifiedValue" : [{
      "context" : {
        "coding" : [{
          "system" : "http://terminology.hl7.org/CodeSystem/referencerange-meaning",
          "code" : "normal",
          "display" : "Normal Range"
        }]
      },
      "rangeCategory" : "reference",
      "range" : {
        "low" : {
          "value" : 0.0,
          "unit" : "ng/mL",
          "system" : "http://unitsofmeasure.org",
          "code" : "ng/mL"
        },
        "high" : {
          "value" : 7.7,
          "unit" : "ng/mL",
          "system" : "http://unitsofmeasure.org",
          "code" : "ng/mL"
        }
      }
    }]
  },
  {
    "code" : {
      "coding" : [{
        "system" : "http://loinc.org",
        "code" : "20569-0",
        "display" : "Creatine kinase.MB/Creatine kinase.total in Serum or Plasma"
      }],
      "text" : "CK-MB Relative Percent"
    },
    "permittedDataType" : ["Quantity"],
    "permittedUnit" : [{
      "system" : "http://unitsofmeasure.org",
      "code" : "%",
      "display" : "%"
    }],
    "qualifiedValue" : [{
      "context" : {
        "coding" : [{
          "system" : "http://terminology.hl7.org/CodeSystem/referencerange-meaning",
          "code" : "normal",
          "display" : "Normal Range"
        }]
      },
      "rangeCategory" : "reference",
      "range" : {
        "low" : {
          "value" : 0.0,
          "unit" : "%",
          "system" : "http://unitsofmeasure.org",
          "code" : "%"
        },
        "high" : {
          "value" : 5.0,
          "unit" : "%",
          "system" : "http://unitsofmeasure.org",
          "code" : "%"
        }
      }
    }]
  }]
}