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

{
  "resourceType" : "Observation",
  "id" : "herd1",
  "text" : {
    "status" : "generated",
    "div" : "<div xmlns=\"http://www.w3.org/1999/xhtml\"><p><b>Generated Narrative: Observation</b><a name=\"herd1\"> </a></p><div style=\"display: inline-block; background-color: #d9e0e7; padding: 6px; margin: 4px; border: 1px solid #8da1b4; border-radius: 5px; line-height: 60%\"><p style=\"margin-bottom: 0px\">Resource Observation &quot;herd1&quot; </p></div><p><b>status</b>: <span title=\"   the mandatory status   \">final</span></p><p><b>category</b>: <span title=\"  category code is A code that classifies the general type of observation being made. This is used for searching, sorting and display purposes. \">Laboratory <span style=\"background: LightGoldenRodYellow; margin: 4px; border: 1px solid khaki\"> (<a href=\"http://terminology.hl7.org/4.0.0/CodeSystem-observation-category.html\">Observation Category Codes</a>#laboratory)</span></span></p><p><b>code</b>: <span title=\"  \n    Observations are often coded in multiple code systems.\n      - LOINC provides codes of varying granularity (though not usefully more specific in this particular case) and more generic LOINCs  can be mapped to more specific codes as shown here\n      - snomed provides a clinically relevant code that is usually less granular than LOINC\n      - the source system provides its own code, which may be less or more granular than LOINC\n    \">Mycoplasma hyopneumoniae - MHP <span style=\"background: LightGoldenRodYellow; margin: 4px; border: 1px solid khaki\"> (<a href=\"https://loinc.org/\">LOINC</a>#80219-9 &quot;Mycoplasma hyopneumoniae Ab sample/Positive control in Serum by Immunoassay&quot;; clinical-codes#Mycoplasma &quot;Mycoplasma&quot;)</span></span></p><p><b>subject</b>: <span title=\"    subject is a herd of 2500 breding sows  \"><a href=\"group-example-herd1.html\">Group/herd1</a> &quot;Breeding herd&quot;</span></p><p><b>encounter</b>: <span>: part of a health assurance program</span></p><p><b>effective</b>: 2017-11-20</p><p><b>value</b>: <span title=\"   In FHIR, units may be represented twice. Once in the\n    agreed human representation, and once in a coded form.\n    Both is best, since it's not always possible to infer\n    one from the other in code.\n\n    When a computable unit is provided, UCUM (http://unitsofmeasure.org)\n    is always preferred, but it doesn't provide notional units (such as\n    &quot;tablet&quot;), etc. For these, something else is required (e.g. SNOMED CT)\n     \">0.2 % (sample/positive control)<span style=\"background: LightGoldenRodYellow\"> (Details: UCUM code % = '%')</span></span></p><p><b>interpretation</b>: Negative <span style=\"background: LightGoldenRodYellow; margin: 4px; border: 1px solid khaki\"> (<a href=\"http://terminology.hl7.org/4.0.0/CodeSystem-v3-ObservationInterpretation.html\">ObservationInterpretation</a>#NEG)</span></p><p><b>specimen</b>: <span title=\"  Specimen is a pooled serology sample of 30 animals. \"><a href=\"specimen-example-pooled-serum.html\">Specimen/pooled-serum: 30 serum</a></span></p><h3>ReferenceRanges</h3><table class=\"grid\"><tr><td>-</td><td><b>Text</b></td></tr><tr><td>*</td><td>&gt;0.4 Positive; 0.3 to 0.4 Suspect &lt; 0.3 Negative</td></tr></table></div>"
  },
  "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"
  }]
}