Pulmonary Function Testing: An Interoperability on FHIR Implementation Guide
0.1.0 - ci-build

Pulmonary Function Testing: An Interoperability on FHIR Implementation Guide - Local Development build (v0.1.0). See the Directory of published versions

: PFT Bundle - JSON Representation

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{
  "resourceType" : "Bundle",
  "id" : "pft-bundle",
  "type" : "collection",
  "entry" : [
    {
      "resource" : {
        "resourceType" : "Composition",
        "id" : "pft-composition",
        "text" : {
          "status" : "generated",
          "div" : "<div xmlns=\"http://www.w3.org/1999/xhtml\"><p><b>Generated Narrative</b></p><p><b>status</b>: preliminary</p><p><b>type</b>: <span title=\"Codes: {http://loinc.org 81458-2}\">Pulmonary function test panel</span></p><p><b>category</b>: <span title=\"Codes: {http://loinc.org 27896-0}\">Pulmonary studies (set)</span></p><p><b>encounter</b>: <a href=\"#Encounter_encounter-01\">See above (Encounter/encounter-01)</a></p><p><b>date</b>: 2017-02-20</p><p><b>author</b>: <a href=\"TODO_PLACEHOLDER\">TODO_PLACEHOLDER</a></p><p><b>title</b>: PFT: test panel Observations and DiagnosticReport</p><p><b>custodian</b>: <a href=\"#Organization_organization-01\">See above (Organization/organization-01)</a></p></div>"
        },
        "status" : "preliminary",
        "type" : {
          "coding" : [
            {
              "system" : "http://loinc.org",
              "code" : "81458-2",
              "display" : "Pulmonary function test panel"
            }
          ]
        },
        "category" : [
          {
            "coding" : [
              {
                "system" : "http://loinc.org",
                "code" : "27896-0",
                "display" : "Pulmonary studies (set)"
              }
            ]
          }
        ],
        "subject" : {
          "reference" : "Patient/patient-01"
        },
        "encounter" : {
          "reference" : "Encounter/encounter-01"
        },
        "date" : "2017-02-20",
        "author" : [
          {
            "reference" : "TODO_PLACEHOLDER"
          }
        ],
        "title" : "PFT: test panel Observations and DiagnosticReport",
        "custodian" : {
          "reference" : "Organization/organization-01"
        },
        "section" : [
          {
            "title" : "PFT Observations and Technician Comment",
            "code" : {
              "coding" : [
                {
                  "system" : "http://loinc.org",
                  "code" : "30954-2",
                  "display" : "Relevant diagnostic tests/laboratory data Narrative"
                }
              ]
            },
            "text" : {
              "status" : "additional",
              "div" : "<div xmlns=\"http://www.w3.org/1999/xhtml\">TECHNICIAN COMMMENTS: No medications in past 24 hr. 400 mcg albuterol given for reversibility testing.</div>"
            },
            "entry" : [
              {
                "reference" : "SpO2_RESTING"
              }
            ],
            "section" : [
              {
                "title" : "Spirometry",
                "code" : {
                  "coding" : [
                    {
                      "system" : "http://loinc.org",
                      "code" : "81459-0",
                      "display" : "Spirometry panel"
                    },
                    {
                      "system" : "http://loinc.org",
                      "code" : "81458-2",
                      "display" : "Pulmonary function test panel"
                    }
                  ]
                },
                "text" : {
                  "status" : "additional",
                  "div" : "<div xmlns=\"http://www.w3.org/1999/xhtml\">Reference values: GLI 2012 Test quality: Pre: FEV1 - A, FVC - A; Post: FEV1 - A, FVC - B</div>"
                },
                "entry" : [
                  {
                    "reference" : "Observation/FVC-PRE"
                  },
                  {
                    "reference" : "Observation/FVC-PRE-Zscore"
                  },
                  {
                    "reference" : "Observation/FVC-PRE-percentPredicted"
                  },
                  {
                    "reference" : "Observation/FVC-POST"
                  },
                  {
                    "reference" : "Observation/FVC-POST-Zscore"
                  },
                  {
                    "reference" : "Observation/FVC-POST-percentPredicted"
                  },
                  {
                    "reference" : "Observation/FVC-POST-mLChange"
                  },
                  {
                    "reference" : "Observation/FVC-post-percentChange"
                  }
                ]
              },
              {
                "title" : "Slow Vital Capacity (Pre-Bronchodilator)",
                "code" : {
                  "coding" : [
                    {
                      "system" : "http://loinc.org",
                      "code" : "81458-2",
                      "display" : "Pulmonary function test panel"
                    }
                  ]
                },
                "text" : {
                  "status" : "additional",
                  "div" : "<div xmlns=\"http://www.w3.org/1999/xhtml\">Reference values: VC - Gutierrez 2004; FEV1/VC - GLI 2012</div>"
                }
              },
              {
                "title" : "Multi-Breath Nitrogen Washout (Post-Bronchodilator)",
                "code" : {
                  "coding" : [
                    {
                      "system" : "http://loinc.org",
                      "code" : "81458-2",
                      "display" : "Pulmonary function test panel"
                    }
                  ]
                },
                "text" : {
                  "status" : "additional",
                  "div" : "<div xmlns=\"http://www.w3.org/1999/xhtml\">Reference values: Gutierrez 2004; Test quality: QA met</div>"
                }
              },
              {
                "title" : "Plethysmography (Post-Bronchodilator)",
                "code" : {
                  "coding" : [
                    {
                      "system" : "http://snomed.info/id",
                      "code" : "20552003",
                      "display" : "Plethysmography (procedure)"
                    }
                  ]
                },
                "text" : {
                  "status" : "additional",
                  "div" : "<div xmlns=\"http://www.w3.org/1999/xhtml\">Reference values: Gutierrez 2004; Test quality: QA met</div>"
                }
              },
              {
                "title" : "Diffusing Capacity (Post-Bronchodilator)",
                "code" : {
                  "coding" : [
                    {
                      "system" : "http://loinc.org",
                      "code" : "81458-2",
                      "display" : "Pulmonary function test panel"
                    }
                  ]
                },
                "text" : {
                  "status" : "additional",
                  "div" : "<div xmlns=\"http://www.w3.org/1999/xhtml\">Reference values: GLI 2017; Test quality: one grade A test; P_B: 721 mmHg</div>"
                }
              }
            ]
          },
          {
            "title" : "Pulmonologist interpretation of PFT and diagnosis",
            "code" : {
              "coding" : [
                {
                  "system" : "http://loinc.org",
                  "code" : "59769-0",
                  "display" : "Postprocedure diagnosis Narrative"
                }
              ]
            },
            "entry" : [
              {
                "reference" : "DiagnosticReport/diagnostic-report"
              }
            ]
          }
        ]
      }
    },
    {
      "resource" : {
        "resourceType" : "Patient",
        "id" : "patient-01",
        "text" : {
          "status" : "additional",
          "div" : "<div xmlns=\"http://www.w3.org/1999/xhtml\">This resource is a stub for use in examples.</div>"
        }
      }
    },
    {
      "resource" : {
        "resourceType" : "Practitioner",
        "id" : "practitioner-01",
        "text" : {
          "status" : "additional",
          "div" : "<div xmlns=\"http://www.w3.org/1999/xhtml\">This resource is a stub for use in examples.</div>"
        },
        "name" : [
          {
            "text" : "Dr. P. Pulmonologist",
            "family" : "Pulmonologist",
            "given" : [
              "P."
            ],
            "prefix" : [
              "Dr."
            ]
          }
        ]
      }
    },
    {
      "resource" : {
        "resourceType" : "Practitioner",
        "id" : "practitioner-02",
        "text" : {
          "status" : "additional",
          "div" : "<div xmlns=\"http://www.w3.org/1999/xhtml\">This resource is a stub for use in examples.</div>"
        }
      }
    },
    {
      "resource" : {
        "resourceType" : "Organization",
        "id" : "organization-01",
        "text" : {
          "status" : "additional",
          "div" : "<div xmlns=\"http://www.w3.org/1999/xhtml\">This resource is a stub for use in examples.</div>"
        },
        "type" : [
          {
            "coding" : [
              {
                "system" : "http://hl7.org/fhir/ValueSet/organization-type",
                "version" : "4.0.1",
                "code" : "prov",
                "display" : "Healthcare Provider"
              }
            ]
          }
        ],
        "name" : "Sample Pulmonary Function Laboratory",
        "telecom" : [
          {
            "system" : "phone",
            "value" : "p555-345-6789",
            "use" : "work"
          },
          {
            "system" : "email",
            "value" : "pftests@lunglab.com",
            "use" : "work"
          }
        ],
        "address" : [
          {
            "use" : "work",
            "type" : "both",
            "text" : "Anytown, Anywhere",
            "city" : "Anytown",
            "state" : "Anywhere"
          }
        ]
      }
    },
    {
      "resource" : {
        "resourceType" : "Encounter",
        "id" : "encounter-01",
        "text" : {
          "status" : "additional",
          "div" : "<div xmlns=\"http://www.w3.org/1999/xhtml\">This resource is a stub for use in examples.</div>"
        },
        "status" : "finished",
        "class" : {
          "code" : "outpatient"
        }
      }
    },
    {
      "resource" : {
        "resourceType" : "ServiceRequest",
        "id" : "serviceRequest-01",
        "text" : {
          "status" : "additional",
          "div" : "<div xmlns=\"http://www.w3.org/1999/xhtml\">This resource is a stub for use in examples.</div>"
        },
        "status" : "completed",
        "intent" : "order",
        "category" : [
          {
            "coding" : [
              {
                "system" : "http://snomed.info/id",
                "code" : "108252007",
                "display" : "Laboratory procedure"
              }
            ]
          }
        ],
        "code" : {
          "coding" : [
            {
              "system" : "http://snomed.info/id",
              "code" : "23426006",
              "display" : "Measurement of respiratory function (procedure)"
            }
          ]
        },
        "subject" : {
          "reference" : "Patient/patient-01"
        },
        "requester" : {
          "reference" : "Practitioner/practitioner-03"
        }
      }
    },
    {
      "resource" : {
        "resourceType" : "DiagnosticReport",
        "id" : "diagnostic-report",
        "text" : {
          "status" : "generated",
          "div" : "<div xmlns=\"http://www.w3.org/1999/xhtml\"><p><b>Generated Narrative</b></p><p><b>status</b>: final</p><p><b>category</b>: <span title=\"Codes: {http://terminology.hl7.org/CodeSystem/v2-0074 PF}\">Pulmonary Function</span></p><p><b>code</b>: <span title=\"Codes: {http://loinc.org 81458-2}\">Pulmonary function test panel</span></p><p><b>subject</b>: <a href=\"#Patient_patient-01\">See above (Patient/patient-01)</a></p><p><b>encounter</b>: <a href=\"#Encounter_encounter-01\">See above (Encounter/encounter-01)</a></p><p><b>effective</b>: 2017-02-24</p><p><b>performer</b>: </p><ul><li><a href=\"#Practitioner_practitioner-02\">See above (Practitioner/practitioner-02)</a></li><li><a href=\"#Organization_organization-01\">See above (Organization/organization-01)</a></li></ul><p><b>resultsInterpreter</b>: <a href=\"#Practitioner_practitioner-01\">See above (Practitioner/practitioner-01)</a></p><p><b>result</b>: </p><ul><li><a href=\"#Observation_FVC-PRE\">See above (Observation/FVC-PRE)</a></li><li><a href=\"#Observation_FVC-PRE-Zscore\">See above (Observation/FVC-PRE-Zscore)</a></li><li><a href=\"#Observation_FVC-PRE-percentPredicted\">See above (Observation/FVC-PRE-percentPredicted)</a></li><li><a href=\"#Observation_FVC-POST\">See above (Observation/FVC-POST)</a></li><li><a href=\"#Observation_FVC-POST-Zscore\">See above (Observation/FVC-POST-Zscore)</a></li><li><a href=\"#Observation_FVC-POST-percentPredicted\">See above (Observation/FVC-POST-percentPredicted)</a></li><li><a href=\"#Observation_FVC-POST-mLChange\">See above (Observation/FVC-POST-mLChange)</a></li><li><a href=\"#Observation_FVC-post-percentChange\">See above (Observation/FVC-post-percentChange)</a></li></ul><p><b>conclusion</b>: Moderately severe, partially reversible airflow obstruction.</p></div>"
        },
        "status" : "final",
        "category" : [
          {
            "coding" : [
              {
                "system" : "http://terminology.hl7.org/CodeSystem/v2-0074",
                "code" : "PF",
                "display" : "Pulmonary Function"
              }
            ]
          }
        ],
        "code" : {
          "coding" : [
            {
              "system" : "http://loinc.org",
              "code" : "81458-2",
              "display" : "Pulmonary function test panel"
            }
          ]
        },
        "subject" : {
          "reference" : "Patient/patient-01"
        },
        "encounter" : {
          "reference" : "Encounter/encounter-01"
        },
        "effectiveDateTime" : "2017-02-24",
        "performer" : [
          {
            "reference" : "Practitioner/practitioner-02"
          },
          {
            "reference" : "Organization/organization-01"
          }
        ],
        "resultsInterpreter" : [
          {
            "reference" : "Practitioner/practitioner-01"
          }
        ],
        "result" : [
          {
            "reference" : "Observation/FVC-PRE"
          },
          {
            "reference" : "Observation/FVC-PRE-Zscore"
          },
          {
            "reference" : "Observation/FVC-PRE-percentPredicted"
          },
          {
            "reference" : "Observation/FVC-POST"
          },
          {
            "reference" : "Observation/FVC-POST-Zscore"
          },
          {
            "reference" : "Observation/FVC-POST-percentPredicted"
          },
          {
            "reference" : "Observation/FVC-POST-mLChange"
          },
          {
            "reference" : "Observation/FVC-post-percentChange"
          }
        ],
        "conclusion" : "Moderately severe, partially reversible airflow obstruction.",
        "presentedForm" : [
          {
            "contentType" : "application/pdf",
            "language" : "en-US",
            "url" : "https://www.atsjournals.org/doi/10.1164/rccm.201710-1981ST",
            "title" : "Sample Pulmonary Function Test"
          }
        ]
      }
    },
    {
      "resource" : {
        "resourceType" : "Observation",
        "id" : "SPO2-RESTING",
        "text" : {
          "status" : "generated",
          "div" : "<div xmlns=\"http://www.w3.org/1999/xhtml\"><p><b>Generated Narrative</b></p><p></p><p><b>code</b>: <span title=\"Codes: {http://loinc.org 59417-6}\">Oxygen saturation in Arterial blood by Pulse oximetry --resting</span></p><p><b>value</b>: 99 %</p></div>"
        },
        "status" : "final",
        "code" : {
          "coding" : [
            {
              "system" : "http://loinc.org",
              "code" : "59417-6",
              "display" : "Oxygen saturation in Arterial blood by Pulse oximetry --resting"
            }
          ]
        },
        "valueQuantity" : {
          "value" : 99,
          "unit" : "%",
          "system" : "http://unitsofmeasure.org",
          "code" : "%"
        }
      }
    },
    {
      "resource" : {
        "resourceType" : "Observation",
        "id" : "FVC-PRE",
        "text" : {
          "status" : "additional",
          "div" : "<div xmlns=\"http://www.w3.org/1999/xhtml\">Test quality: A</div>"
        },
        "status" : "final",
        "category" : [
          {
            "coding" : [
              {
                "system" : "http://terminology.hl7.org/CodeSystem/observation-category",
                "version" : "4.0.1",
                "code" : "procedure",
                "display" : "Procedure"
              }
            ]
          }
        ],
        "code" : {
          "coding" : [
            {
              "system" : "http://loinc.org",
              "code" : "19876-2",
              "display" : "Forced vital capacity [Volume] Respiratory system by Spirometry --pre bronchodilation"
            }
          ]
        },
        "subject" : {
          "reference" : "Patient/patient-01"
        },
        "encounter" : {
          "reference" : "Encounter/encounter-01"
        },
        "effectiveDateTime" : "2015-02-07T13:28:17-05:00",
        "performer" : [
          {
            "reference" : "Practitioner/practitioner-02"
          },
          {
            "reference" : "Organization/organization-01"
          }
        ],
        "valueQuantity" : {
          "value" : 3.9,
          "unit" : "L",
          "system" : "http://unitsofmeasure.org",
          "code" : "L"
        },
        "referenceRange" : [
          {
            "low" : {
              "value" : 3.7,
              "unit" : "L",
              "system" : "http://unitsofmeasure.org",
              "code" : "L"
            },
            "type" : {
              "text" : "FVC normal bounds"
            }
          }
        ]
      }
    },
    {
      "resource" : {
        "resourceType" : "Observation",
        "id" : "FVC-PRE-Zscore",
        "text" : {
          "status" : "generated",
          "div" : "<div xmlns=\"http://www.w3.org/1999/xhtml\"><p><b>Generated Narrative</b></p><p></p><p><b>code</b>: <span title=\"Codes: \">FVC_PRE Z-score</span></p><p><b>value</b>: -1.34 Z-score</p><p><b>derivedFrom</b>: </p><ul><li><a href=\"#Observation_FVC-PRE\">See above (Observation/FVC-PRE)</a></li><li><a href=\"Observation-FVC-PREREF-predicted.html\">Generated Summary: <span title=\"Codes: {http://loinc.org 19869-7}\">Forced vital capacity [Volume] Respiratory system Predicted</span>; Reference value, taken from GLI 2012. Depends on the patient's demographic info. (By Created for PFT example @2021-06-10)</a></li></ul></div>"
        },
        "status" : "final",
        "code" : {
          "text" : "FVC_PRE Z-score"
        },
        "valueQuantity" : {
          "value" : -1.34,
          "unit" : "Z-score",
          "system" : "http://unitsofmeasure.org",
          "code" : "{Zscore}"
        },
        "derivedFrom" : [
          {
            "reference" : "Observation/FVC-PRE"
          },
          {
            "reference" : "Observation/FVC-PREREF-predicted"
          }
        ]
      }
    },
    {
      "resource" : {
        "resourceType" : "Observation",
        "id" : "FVC-PRE-percentPredicted",
        "text" : {
          "status" : "generated",
          "div" : "<div xmlns=\"http://www.w3.org/1999/xhtml\"><p><b>Generated Narrative</b></p><p></p><p><b>code</b>: <span title=\"Codes: {http://loinc.org 19871-3}\">FVC pre bronchodilation measured/predicted</span></p><p><b>value</b>: 82 %</p><p><b>derivedFrom</b>: </p><ul><li><a href=\"#Observation_FVC-PRE\">See above (Observation/FVC-PRE)</a></li><li><a href=\"Observation-FVC-PREREF-predicted.html\">Generated Summary: <span title=\"Codes: {http://loinc.org 19869-7}\">Forced vital capacity [Volume] Respiratory system Predicted</span>; Reference value, taken from GLI 2012. Depends on the patient's demographic info. (By Created for PFT example @2021-06-10)</a></li></ul></div>"
        },
        "status" : "final",
        "code" : {
          "coding" : [
            {
              "system" : "http://loinc.org",
              "code" : "19871-3",
              "display" : "FVC pre bronchodilation measured/predicted"
            }
          ]
        },
        "valueQuantity" : {
          "value" : 82,
          "unit" : "%",
          "system" : "http://unitsofmeasure.org",
          "code" : "%"
        },
        "derivedFrom" : [
          {
            "reference" : "Observation/FVC-PRE"
          },
          {
            "reference" : "Observation/FVC-PREREF-predicted"
          }
        ]
      }
    },
    {
      "resource" : {
        "resourceType" : "Observation",
        "id" : "FVC-POST",
        "text" : {
          "status" : "generated",
          "div" : "<div xmlns=\"http://www.w3.org/1999/xhtml\"><p><b>Generated Narrative</b></p><p></p><p><b>code</b>: <span title=\"Codes: {http://loinc.org 19874-7}\">Forced vital capacity [Volume] Respiratory system by Spirometry --post bronchodilation</span></p><p><b>value</b>: 4.7 L</p><h3>ReferenceRanges</h3><table class=\"grid\"><tr><td>-</td><td><b>Low</b></td><td><b>Type</b></td></tr><tr><td>*</td><td>3.7 L</td><td><span title=\"Codes: \">FVC normal bounds</span></td></tr></table></div>"
        },
        "status" : "final",
        "code" : {
          "coding" : [
            {
              "system" : "http://loinc.org",
              "code" : "19874-7",
              "display" : "Forced vital capacity [Volume] Respiratory system by Spirometry --post bronchodilation"
            }
          ]
        },
        "valueQuantity" : {
          "value" : 4.7,
          "unit" : "L",
          "system" : "http://unitsofmeasure.org",
          "code" : "L"
        },
        "referenceRange" : [
          {
            "low" : {
              "value" : 3.7,
              "unit" : "L",
              "system" : "http://unitsofmeasure.org",
              "code" : "L"
            },
            "type" : {
              "text" : "FVC normal bounds"
            }
          }
        ]
      }
    },
    {
      "resource" : {
        "resourceType" : "Observation",
        "id" : "FVC-POST-Zscore",
        "text" : {
          "status" : "generated",
          "div" : "<div xmlns=\"http://www.w3.org/1999/xhtml\"><p><b>Generated Narrative</b></p><p></p><p><b>code</b>: <span title=\"Codes: \">FVC_POST z-score</span></p><p><b>value</b>: -0.09 Z-score</p><p><b>derivedFrom</b>: <a href=\"#Observation_FVC-POST\">See above (Observation/FVC-POST)</a></p></div>"
        },
        "status" : "final",
        "code" : {
          "text" : "FVC_POST z-score"
        },
        "valueQuantity" : {
          "value" : -0.09,
          "unit" : "Z-score",
          "system" : "http://unitsofmeasure.org",
          "code" : "{Zscore}"
        },
        "derivedFrom" : [
          {
            "reference" : "Observation/FVC-POST"
          }
        ]
      }
    },
    {
      "resource" : {
        "resourceType" : "Observation",
        "id" : "FVC-POST-percentPredicted",
        "text" : {
          "status" : "generated",
          "div" : "<div xmlns=\"http://www.w3.org/1999/xhtml\"><p><b>Generated Narrative</b></p><p></p><p><b>code</b>: <span title=\"Codes: {http://loinc.org 19873-9}\">FVC post bronchodilation measured/predicted</span></p><p><b>value</b>: 99 %</p><p><b>derivedFrom</b>: <a href=\"#Observation_FVC-POST\">See above (Observation/FVC-POST)</a></p></div>"
        },
        "status" : "final",
        "code" : {
          "coding" : [
            {
              "system" : "http://loinc.org",
              "code" : "19873-9",
              "display" : "FVC post bronchodilation measured/predicted"
            }
          ]
        },
        "valueQuantity" : {
          "value" : 99,
          "unit" : "%",
          "system" : "http://unitsofmeasure.org",
          "code" : "%"
        },
        "derivedFrom" : [
          {
            "reference" : "Observation/FVC-POST"
          }
        ]
      }
    },
    {
      "resource" : {
        "resourceType" : "Observation",
        "id" : "FVC-POST-mLChange",
        "text" : {
          "status" : "generated",
          "div" : "<div xmlns=\"http://www.w3.org/1999/xhtml\"><p><b>Generated Narrative</b></p><p></p><p><b>code</b>: <span title=\"Codes: \">FVC POST change (mL)</span></p><p><b>value</b>: 600 mL</p><p><b>derivedFrom</b>: </p><ul><li><a href=\"#Observation_FVC-PRE\">See above (Observation/FVC-PRE)</a></li><li><a href=\"#Observation_FVC-POST\">See above (Observation/FVC-POST)</a></li></ul></div>"
        },
        "status" : "final",
        "code" : {
          "text" : "FVC POST change (mL)"
        },
        "valueQuantity" : {
          "value" : 600,
          "unit" : "mL",
          "system" : "http://unitsofmeasure.org",
          "code" : "mL"
        },
        "derivedFrom" : [
          {
            "reference" : "Observation/FVC-PRE"
          },
          {
            "reference" : "Observation/FVC-POST"
          }
        ]
      }
    },
    {
      "resource" : {
        "resourceType" : "Observation",
        "id" : "FVC-post-percentChange",
        "text" : {
          "status" : "generated",
          "div" : "<div xmlns=\"http://www.w3.org/1999/xhtml\"><p><b>Generated Narrative</b></p><p></p><p><b>code</b>: <span title=\"Codes: {http://loinc.org 69982-7}\">FVC percent change Respiratory system</span></p><p><b>value</b>: 20 %</p><p><b>derivedFrom</b>: </p><ul><li><a href=\"#Observation_FVC-PRE\">See above (Observation/FVC-PRE)</a></li><li><a href=\"#Observation_FVC-POST\">See above (Observation/FVC-POST)</a></li></ul></div>"
        },
        "status" : "final",
        "code" : {
          "coding" : [
            {
              "system" : "http://loinc.org",
              "code" : "69982-7",
              "display" : "FVC percent change Respiratory system"
            }
          ]
        },
        "valueQuantity" : {
          "value" : 20,
          "unit" : "%",
          "system" : "http://unitsofmeasure.org",
          "code" : "%"
        },
        "derivedFrom" : [
          {
            "reference" : "Observation/FVC-PRE"
          },
          {
            "reference" : "Observation/FVC-POST"
          }
        ]
      }
    }
  ]
}