An example of a herd screening ELISA assay for Mycoplasmal Pneumonia in Pigs.

{
  "resourceType" : "Observation",
  "id" : "herd1",
  "status" : "final",
  "category" : [{
    "coding" : [{
      "system" : "http://terminology.hl7.org/CodeSystem/observation-category",
      "code" : "laboratory",
      "display" : "Laboratory"
    }],
    "text" : "Laboratory"
  }],
  "code" : {
    "coding" : [{
      "system" : "http://loinc.org",
      "code" : "80219-9",
      "display" : "Mycoplasma hyopneumoniae Ab sample/Positive control in Serum by Immunoassay"
    },
    {
      "system" : "http://acme.org/devices/clinical-codes",
      "code" : "Mycoplasma",
      "display" : "Mycoplasma"
    }],
    "text" : "Mycoplasma hyopneumoniae - MHP"
  },
  "subject" : {
    "reference" : "Group/herd1"
  },
  "encounter" : {
    "display" : "part of a health assurance program"
  },
  "effectiveDateTime" : "2017-11-20",
  "valueQuantity" : {
    "value" : 0.2,
    "unit" : "% (sample/positive control)",
    "system" : "http://unitsofmeasure.org",
    "code" : "%"
  },
  "interpretation" : [{
    "coding" : [{
      "system" : "http://terminology.hl7.org/CodeSystem/v3-ObservationInterpretation",
      "code" : "NEG",
      "display" : "Negative"
    }],
    "text" : "Negative"
  }],
  "specimen" : {
    "reference" : "Specimen/pooled-serum",
    "display" : "30 serum"
  },
  "referenceRange" : [{
    "text" : ">0.4 Positive; 0.3 to 0.4 Suspect < 0.3 Negative"
  }]
}