Blood Pressure Measurement with an absent Diastolic measurement

{
  "resourceType" : "Observation",
  "id" : "blood-pressure-dar",
  "meta" : {
    "profile" : ["http://hl7.org/fhir/StructureDefinition/vitalsigns"]
  },
  "text" : {
    "status" : "generated",
    "div" : "<div xmlns=\"http://www.w3.org/1999/xhtml\"><p><b>Generated Narrative: Observation</b><a name=\"blood-pressure-dar\"> </a></p><div style=\"display: inline-block; background-color: #d9e0e7; padding: 6px; margin: 4px; border: 1px solid #8da1b4; border-radius: 5px; line-height: 60%\"><p style=\"margin-bottom: 0px\">Resource Observation &quot;blood-pressure-dar&quot; </p><p style=\"margin-bottom: 0px\">Profile: <a href=\"vitalsigns.html\">Vital Signs Profile</a></p></div><p><b>identifier</b>: id:\u00a0<a href=\"http://terminology.hl7.org/5.4.0/NamingSystem-uri.html\">#</a>urn:uuid:187e0c12-8dd2-67e2-99b2-bf273c878281</p><p><b>status</b>: final</p><p><b>category</b>: Vital Signs <span style=\"background: LightGoldenRodYellow; margin: 4px; border: 1px solid khaki\"> (<a href=\"http://terminology.hl7.org/5.4.0/CodeSystem-observation-category.html\">Observation Category Codes</a>#vital-signs)</span></p><p><b>code</b>: Blood pressure systolic &amp; diastolic <span style=\"background: LightGoldenRodYellow; margin: 4px; border: 1px solid khaki\"> (<a href=\"https://loinc.org/\">LOINC</a>#85354-9 &quot;Blood pressure panel with all children optional&quot;)</span></p><p><b>subject</b>: <a href=\"patient-example.html\">Patient/example</a> &quot;Peter CHALMERS&quot;</p><p><b>effective</b>: 2012-09-17</p><p><b>performer</b>: <a href=\"practitioner-example.html\">Practitioner/example</a> &quot;Adam CAREFUL&quot;</p><p><b>interpretation</b>: <span title=\"    an interpretation offered to the combination observation\n        generally, it would only be appropriate to offer an interpretation\n        of an observation that has no value if it has &quot;COMP&quot; (component)\n        observations    \">Below low normal <span style=\"background: LightGoldenRodYellow; margin: 4px; border: 1px solid khaki\"> (<a href=\"http://terminology.hl7.org/5.4.0/CodeSystem-v3-ObservationInterpretation.html\">ObservationInterpretation</a>#L &quot;low&quot;)</span></span></p><p><b>bodySite</b>: <span title=\" The BodySite can be captured in a LOINC code but am showing it here to demonstrate populating the element  \">Right arm <span style=\"background: LightGoldenRodYellow; margin: 4px; border: 1px solid khaki\"> (<a href=\"https://browser.ihtsdotools.org/\">SNOMED CT</a>#368209003)</span></span></p><blockquote><p><b>component</b></p><p><b>code</b>: <span title=\" \n           Observations are often coded in multiple code systems.\n           - LOINC provides a very specific code (though not more specific in this particular case)\n           - snomed provides a clinically relevant code that is usually less granular than LOINC\n           - the source system provides its own code, which may be less or more granular than LOINC\n\nthis is shown here to demonstrate  the concept of translations within the codeableConcept datatype. The diastolic code below only has a LOINC code\n            \">Systolic blood pressure <span style=\"background: LightGoldenRodYellow; margin: 4px; border: 1px solid khaki\"> (<a href=\"https://loinc.org/\">LOINC</a>#8480-6; <a href=\"https://browser.ihtsdotools.org/\">SNOMED CT</a>#271649006; clinical-codes#bp-s &quot;Systolic Blood pressure&quot;)</span></span></p><p><b>value</b>: 107 mmHg<span style=\"background: LightGoldenRodYellow\"> (Details: UCUM code mm[Hg] = 'mmHg')</span></p></blockquote><blockquote><p><b>component</b></p><p><b>code</b>: Diastolic blood pressure <span style=\"background: LightGoldenRodYellow; margin: 4px; border: 1px solid khaki\"> (<a href=\"https://loinc.org/\">LOINC</a>#8462-4)</span></p><p><b>dataAbsentReason</b>: <span title=\"    Here the Diastolic measurement is missing and we give a reason using the DataAbsentReason element    \">Not Performed <span style=\"background: LightGoldenRodYellow; margin: 4px; border: 1px solid khaki\"> (<a href=\"http://terminology.hl7.org/5.4.0/CodeSystem-data-absent-reason.html\">DataAbsentReason</a>#not-performed)</span></span></p></blockquote></div>"
  },
  "identifier" : [{
    "system" : "urn:ietf:rfc:3986",
    "value" : "urn:uuid:187e0c12-8dd2-67e2-99b2-bf273c878281"
  }],
  "status" : "final",
  "category" : [{
    "coding" : [{
      "system" : "http://terminology.hl7.org/CodeSystem/observation-category",
      "code" : "vital-signs",
      "display" : "Vital Signs"
    }]
  }],
  "code" : {
    "coding" : [{
      "system" : "http://loinc.org",
      "code" : "85354-9",
      "display" : "Blood pressure panel with all children optional"
    }],
    "text" : "Blood pressure systolic & diastolic"
  },
  "subject" : {
    "reference" : "Patient/example"
  },
  "effectiveDateTime" : "2012-09-17",
  "performer" : [{
    "reference" : "Practitioner/example"
  }],
  "interpretation" : [{
    "coding" : [{
      "system" : "http://terminology.hl7.org/CodeSystem/v3-ObservationInterpretation",
      "code" : "L",
      "display" : "low"
    }],
    "text" : "Below low normal"
  }],
  "bodySite" : {
    "coding" : [{
      "system" : "http://snomed.info/sct",
      "code" : "368209003",
      "display" : "Right arm"
    }]
  },
  "component" : [{
    "code" : {
      "coding" : [{
        "system" : "http://loinc.org",
        "code" : "8480-6",
        "display" : "Systolic blood pressure"
      },
      {
        "system" : "http://snomed.info/sct",
        "code" : "271649006",
        "display" : "Systolic blood pressure"
      },
      {
        "system" : "http://acme.org/devices/clinical-codes",
        "code" : "bp-s",
        "display" : "Systolic Blood pressure"
      }]
    },
    "valueQuantity" : {
      "value" : 107,
      "unit" : "mmHg",
      "system" : "http://unitsofmeasure.org",
      "code" : "mm[Hg]"
    }
  },
  {
    "code" : {
      "coding" : [{
        "system" : "http://loinc.org",
        "code" : "8462-4",
        "display" : "Diastolic blood pressure"
      }]
    },
    "dataAbsentReason" : {
      "coding" : [{
        "system" : "http://terminology.hl7.org/CodeSystem/data-absent-reason",
        "code" : "not-performed",
        "display" : "Not Performed"
      }]
    }
  }]
}