Real-world patient - estimated gfr

{
  "resourceType" : "Observation",
  "id" : "f205",
  "identifier" : [{
    "system" : "https://intranet.aumc.nl/labvalues",
    "value" : "1304-03720-eGFR"
  }],
  "status" : "final",
  "code" : {
    "coding" : [{
      "system" : "http://loinc.org",
      "code" : "33914-3",
      "display" : "Glomerular filtration rate/1.73 sq M.predicted [Volume Rate/Area] in Serum or Plasma by Creatinine-based formula (MDRD)"
    }]
  },
  "subject" : {
    "reference" : "Patient/f201",
    "display" : "Roel"
  },
  "issued" : "2013-04-04T14:34:00+01:00",
  "performer" : [{
    "reference" : "Practitioner/f202",
    "display" : "Luigi Maas"
  }],
  "interpretation" : [{
    "text" : "interpretation of results should be assigned based upon the level of kindey function"
  }],
  "note" : [{
    "text" : "GFR estimating equations developed by the Modification of Diet in Renal Disease (MDRD) Study Group and the Chronic Kidney Disease Epidemiology Collaboration (CKD-EPI)...."
  }],
  "method" : {
    "coding" : [{
      "system" : "http://snomed.info/sct",
      "code" : "702668005",
      "display" : "MDRD"
    }]
  },
  "component" : [{
    "code" : {
      "coding" : [{
        "system" : "http://loinc.org",
        "code" : "48643-1",
        "display" : "Glomerular filtration rate/1.73 sq M.predicted among blacks [Volume Rate/Area] in Serum, Plasma or Blood by Creatinine-based formula (MDRD)"
      }]
    },
    "valueQuantity" : {
      "value" : 60,
      "comparator" : ">",
      "unit" : "mL/min/1.73m2",
      "system" : "http://unitsofmeasure.org",
      "code" : "mL/min/{1.73_m2}"
    },
    "referenceRange" : [{
      "low" : {
        "value" : 60,
        "unit" : "mL/min/1.73m2",
        "system" : "http://unitsofmeasure.org",
        "code" : "mL/min/{1.73_m2}"
      },
      "appliesTo" : [{
        "text" : "non-black/african-american"
      }],
      "age" : {
        "low" : {
          "value" : 18,
          "unit" : "yrs",
          "system" : "http://unitsofmeasure.org",
          "code" : "a"
        }
      }
    }]
  },
  {
    "code" : {
      "coding" : [{
        "system" : "http://loinc.org",
        "code" : "48642-3",
        "display" : "GFR/BSA pr.non blk SerPlBld MDRD-ArV"
      }]
    },
    "valueQuantity" : {
      "value" : 60,
      "unit" : "mL/min/1.73m2",
      "system" : "http://unitsofmeasure.org",
      "code" : "mL/min/{1.73_m2}"
    },
    "referenceRange" : [{
      "low" : {
        "value" : 60,
        "unit" : "mL/min/1.73m2",
        "system" : "http://unitsofmeasure.org",
        "code" : "mL/min/{1.73_m2}"
      },
      "age" : {
        "low" : {
          "value" : 18,
          "unit" : "yrs",
          "system" : "http://unitsofmeasure.org",
          "code" : "a"
        }
      }
    }]
  }]
}