{

"resourceType": "Communication",
"id": "example",
"identifier": [
  {
    "type": {
      "text": "Paging System"
    },
    "system": "urn:oid:1.3.4.5.6.7",
    "value": "2345678901"
  }
],
"instantiatesUri": [
  "http://example.org/hyperkalemia"
],
"partOf": [
  {
    "display": "Serum Potassium Observation"
  }
],
"status": "completed",
"category": [
  {
    "coding": [
      {
        "system": "http://acme.org/messagetypes",
        "code": "Alert"
      }
    ],
    "text": "Alert"
  }
],
"medium": [
  {
    "coding": [
      {
        "system": "http://terminology.hl7.org/CodeSystem/v3-ParticipationMode",
        "code": "WRITTEN",
        "display": "written"
      }
    ],
    "text": "written"
  }
],
"subject": {
  "reference": "Patient/example"
},
"encounter": {
  "reference": "Encounter/example"
},
"sent": "2014-12-12T18:01:10-08:00",
"received": "2014-12-12T18:01:11-08:00",
"recipient": [
  {
    "reference": "Practitioner/example"
  }
],
"sender": {
  "reference": "Device/f001"
},
"payload": [
  {
    "contentString": "Patient 1 has a very high serum potassium value (7.2 mmol/L on 2014-Dec-12 at 5:55 pm)"
  },
  {
    "contentReference": {
      "display": "Serum Potassium Observation"
    }
  }
],
"meta": {
  "tag": [
    {
      "system": "http://terminology.hl7.org/CodeSystem/v3-ActReason",
      "code": "HTEST",
      "display": "test health data"
    }
  ]
}

}