Real-world patient - CO2

{
  "resourceType" : "Observation",
  "id" : "f003",
  "identifier" : [{
    "use" : "official",
    "system" : "http://www.bmc.nl/zorgportal/identifiers/observations",
    "value" : "6325"
  }],
  "status" : "final",
  "code" : {
    "coding" : [{
      "system" : "http://loinc.org",
      "code" : "11557-6",
      "display" : "Carbon dioxide [Partial pressure] in Blood"
    }]
  },
  "subject" : {
    "reference" : "Patient/f001",
    "display" : "P. van de Heuvel"
  },
  "effectiveDateTime" : "2013-04-02T10:30:10+01:00",
  "issued" : "2013-04-03T15:30:10+01:00",
  "performer" : [{
    "reference" : "Practitioner/f005",
    "display" : "A. Langeveld"
  }],
  "valueQuantity" : {
    "value" : 6.2,
    "unit" : "kPa",
    "system" : "http://unitsofmeasure.org",
    "code" : "kPa"
  },
  "interpretation" : [{
    "coding" : [{
      "system" : "http://terminology.hl7.org/CodeSystem/v3-ObservationInterpretation",
      "code" : "H",
      "display" : "High"
    }]
  }],
  "referenceRange" : [{
    "low" : {
      "value" : 4.8,
      "unit" : "kPa",
      "system" : "http://unitsofmeasure.org",
      "code" : "kPa"
    },
    "high" : {
      "value" : 6.0,
      "unit" : "kPa",
      "system" : "http://unitsofmeasure.org",
      "code" : "kPa"
    }
  }]
}