# Lab observation serum Na - Order Catalog Implementation Guide v1.0.0

* [**Table Content**](toc.md)
* [**Artifacts Summary**](artifacts.md)
* **Lab observation serum Na**

## Example ObservationDefinition: Lab observation serum Na

| |
| :--- |
| *Page standards status:*[Informative](http://hl7.org/fhir/R5/versions.html#std-process) |

Language: en-US

Profile: [Laboratory Observation Definition](StructureDefinition-LabObservationDefinition.md)

**status**: Active

**category**: Laboratory

**code**: sodium [Moles/volume] in Serum or Plasma

**permittedDataType**: Quantity, string

**multipleResultsAllowed**: false

**method**: Ion Selective Electrode (ISE)

**preferredReportName**: sodium

**permittedUnit**: [UCUM: mmol/L](http://tx.fhir.org/r5/ValueSet/x-ucum#x-ucum-mmol.47L) (mmol/L), [UCUM: g/L](http://tx.fhir.org/r5/ValueSet/x-ucum#x-ucum-g.47L) (g/L)

### QualifiedValues

| | | | |
| :--- | :--- | :--- | :--- |
| - | **Context** | **RangeCategory** | **Range** |
| * | Normal Range | reference range | 136-145 |



## Resource Content

```json
{
  "resourceType" : "ObservationDefinition",
  "id" : "example-observation-serum-sodium",
  "meta" : {
    "profile" : ["http://hl7.org/fhir/uv/order-catalog/StructureDefinition/LabObservationDefinition"]
  },
  "language" : "en-US",
  "status" : "active",
  "category" : [{
    "coding" : [{
      "system" : "http://terminology.hl7.org/CodeSystem/observation-category",
      "code" : "laboratory",
      "display" : "Laboratory"
    }]
  }],
  "code" : {
    "coding" : [{
      "system" : "http://loinc.org",
      "code" : "2951-2",
      "display" : "sodium [Moles/volume] in Serum or Plasma"
    }]
  },
  "permittedDataType" : ["Quantity", "string"],
  "multipleResultsAllowed" : false,
  "method" : {
    "text" : "Ion Selective Electrode (ISE)"
  },
  "preferredReportName" : "sodium",
  "permittedUnit" : [{
    "system" : "http://unitsofmeasure.org",
    "code" : "mmol/L"
  },
  {
    "system" : "http://unitsofmeasure.org",
    "code" : "g/L"
  }],
  "qualifiedValue" : [{
    "context" : {
      "coding" : [{
        "system" : "http://terminology.hl7.org/CodeSystem/referencerange-meaning",
        "code" : "normal",
        "display" : "Normal Range"
      }]
    },
    "rangeCategory" : "reference",
    "range" : {
      "low" : {
        "value" : 136,
        "system" : "http://unitsofmeasure.org",
        "code" : "mmol/L"
      },
      "high" : {
        "value" : 145,
        "system" : "http://unitsofmeasure.org",
        "code" : "mmol/L"
      }
    }
  }]
}

```
