Example of an Observations made about a location - an oyster farm

{
  "resourceType" : "Observation",
  "id" : "vp-oyster",
  "contained" : [{
    "resourceType" : "Specimen",
    "id" : "bed1",
    "note" : [{
      "text" : "Live Oysters Acc#20171014-1234 from Bed 1"
    }]
  },
  {
    "resourceType" : "Specimen",
    "id" : "bed2",
    "note" : [{
      "text" : "Live Oysters Acc#20171014-1234 from Bed 2"
    }]
  },
  {
    "resourceType" : "Group",
    "id" : "group1",
    "type" : "animal",
    "membership" : "enumerated",
    "member" : [{
      "entity" : {
        "reference" : "#bed1"
      }
    },
    {
      "entity" : {
        "reference" : "#bed2"
      }
    }]
  }],
  "identifier" : [{
    "use" : "official",
    "system" : "http://sonomacounty.ca.gov/Health/Public-Health/Laboratory",
    "value" : "20171014-1234"
  }],
  "status" : "preliminary",
  "code" : {
    "coding" : [{
      "system" : "http://loinc.org",
      "code" : "41857-4",
      "display" : "Vibrio parahaemolyticus DNA [Presence] in Specimen by NAA with probe detection"
    },
    {
      "system" : "http://sonomacounty.ca.gov/Health/Public-Health/Laboratory/test-codes",
      "code" : "VP MULTI PCR",
      "display" : "VP MULTI PCR"
    }],
    "text" : "OYSTER TESTING"
  },
  "subject" : {
    "display" : "Sonoma oyster farm"
  },
  "effectiveDateTime" : "2017-10-12",
  "issued" : "2017-10-14T23:11:24Z",
  "performer" : [{
    "reference" : "Practitioner/f005",
    "display" : "A. Langeveld"
  }],
  "valueCodeableConcept" : {
    "coding" : [{
      "system" : "http://snomed.info/sct",
      "code" : "10828004",
      "display" : "Positive (qualifier value)"
    },
    {
      "system" : "http://sonomacounty.ca.gov/Health/Public-Health/Laboratory/result-codes",
      "code" : "POSITIVE",
      "display" : "POSITIVE"
    }],
    "text" : "POSITIVE"
  },
  "interpretation" : [{
    "coding" : [{
      "system" : "http://terminology.hl7.org/CodeSystem/v3-ObservationInterpretation",
      "code" : "A",
      "display" : "Abnormal"
    }]
  }],
  "specimen" : {
    "reference" : "#group1"
  },
  "referenceRange" : [{
    "text" : "NEGATIVE"
  }]
}