# Example Negation Observation - Using CQL With FHIR v3.0.0-ballot

## Example Observation: Example Negation Observation

**status**: Cancelled

**category**: Laboratory

**code**: Not Done Value Set: Hemoglobin lab test (value set: `http://cts.nlm.nih.gov/fhir/2.16.840.1.113762.1.4.1045.131`)

**subject**: [Alana Asdf (no stated gender), DoB: 1993-06-14](Patient-example.md)

**effective**: 2013-04-02 10:30:10+0100 --> 2013-04-05 10:30:10+0100

**issued**: 2013-04-03 15:30:10+0100



## Resource Content

```json
{
  "resourceType" : "Observation",
  "id" : "negation-example",
  "status" : "cancelled",
  "category" : [{
    "coding" : [{
      "system" : "http://terminology.hl7.org/CodeSystem/observation-category",
      "code" : "laboratory",
      "display" : "Laboratory"
    }]
  }],
  "code" : {
    "extension" : [{
      "url" : "http://hl7.org/fhir/StructureDefinition/codeOptions",
      "valueCanonical" : "http://cts.nlm.nih.gov/fhir/2.16.840.1.113762.1.4.1045.131"
    }],
    "text" : "Not Done Value Set: Hemoglobin lab test"
  },
  "subject" : {
    "reference" : "Patient/example"
  },
  "effectivePeriod" : {
    "start" : "2013-04-02T10:30:10+01:00",
    "end" : "2013-04-05T10:30:10+01:00"
  },
  "issued" : "2013-04-03T15:30:10+01:00"
}

```
