Real-world patient - erythrocyte

{
  "resourceType" : "Observation",
  "id" : "f004",
  "identifier" : [{
    "use" : "official",
    "system" : "http://www.bmc.nl/zorgportal/identifiers/observations",
    "value" : "6326"
  }],
  "status" : "final",
  "code" : {
    "coding" : [{
      "system" : "http://loinc.org",
      "code" : "789-8",
      "display" : "Erythrocytes [#/volume] in Blood by Automated count"
    }]
  },
  "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" : 4.12,
    "unit" : "10^12/L",
    "system" : "http://unitsofmeasure.org",
    "code" : "10*12/L"
  },
  "interpretation" : [{
    "coding" : [{
      "system" : "http://terminology.hl7.org/CodeSystem/v3-ObservationInterpretation",
      "code" : "L",
      "display" : "Low"
    }]
  }],
  "referenceRange" : [{
    "text" : "12-14 y Male: 4.4 - 5.2  x  10^12/L ; 12-14 y Female: 4.2 - 4.8  x  10^12/L ; 15-17 y Male: 4.6 - 5.4  x  10^12/L ; 15-17 y Female: 4.2 - 4.8  x  10^12/L ; 18-64 y Male: 4.6 - 5.4  x  10^12/L ; 18-64 y Female: 4.0 - 4.8  x  10^12/L ; 65-74 y Male: 4.3 - 5.3  x  10^12/L ; 65-74 y Female: 4.1 - 4.9  x  10^12/L"
  }]
}