# Ratio (Eu Lab) - HL7 Europe Laboratory Report v2.0.0

* [**Table of Contents**](toc.md)
* [**Artifacts Summary**](artifacts.md)
* **Ratio (Eu Lab)**

## Data Type Profile: Ratio (Eu Lab) 

| | |
| :--- | :--- |
| *Official URL*:http://hl7.eu/fhir/laboratory/StructureDefinition/Ratio-eu-lab | *Version*:2.0.0 |
| Active as of 2026-05-05 | *Computable Name*:RatioEuLab |
| **Copyright/Legal**: Copyright HL7 Europe. Licensed under creative commons public domain (CC0 1.0). | |

 
This profile constrains the Ratio data type to use UCUM as the code system for units and optionally share measurement uncertainty 

 
This profile of the Ratio data type imposes the usage of the UCUM as the code system for units and allows expressing uncertainty of measurement 

**Usages:**

* Use this DataType Profile: [Observation Results: laboratory](StructureDefinition-Observation-resultslab-eu-lab.md)

You can also check for [usages in the FHIR IG Statistics](https://packages2.fhir.org/xig/hl7.fhir.eu.laboratory|current/StructureDefinition/Ratio-eu-lab)

### Formal Views of Profile Content

 [Description of Profiles, Differentials, Snapshots and how the different presentations work](http://build.fhir.org/ig/FHIR/ig-guidance/readingIgs.html#structure-definitions). 

 

Other representations of profile: [CSV](StructureDefinition-Ratio-eu-lab.csv), [Excel](StructureDefinition-Ratio-eu-lab.xlsx), [Schematron](StructureDefinition-Ratio-eu-lab.sch) 



## Resource Content

```json
{
  "resourceType" : "StructureDefinition",
  "id" : "Ratio-eu-lab",
  "url" : "http://hl7.eu/fhir/laboratory/StructureDefinition/Ratio-eu-lab",
  "version" : "2.0.0",
  "name" : "RatioEuLab",
  "title" : "Ratio (Eu Lab)",
  "status" : "active",
  "date" : "2026-05-05T16:28:07+02:00",
  "publisher" : "HL7 Europe",
  "contact" : [{
    "name" : "HL7 Europe",
    "telecom" : [{
      "system" : "url",
      "value" : "http://hl7.eu"
    }]
  }],
  "description" : "This profile constrains the Ratio data type to use UCUM as the code system for units and optionally share measurement uncertainty",
  "jurisdiction" : [{
    "coding" : [{
      "system" : "http://unstats.un.org/unsd/methods/m49/m49.htm",
      "code" : "150",
      "display" : "Europe"
    }]
  }],
  "purpose" : "This profile of the Ratio data type imposes the usage of the UCUM as the code system for units and allows expressing uncertainty of measurement",
  "copyright" : "Copyright HL7 Europe. Licensed under creative commons public domain (CC0 1.0).",
  "fhirVersion" : "4.0.1",
  "mapping" : [{
    "identity" : "v2",
    "uri" : "http://hl7.org/v2",
    "name" : "HL7 v2 Mapping"
  },
  {
    "identity" : "rim",
    "uri" : "http://hl7.org/v3",
    "name" : "RIM Mapping"
  }],
  "kind" : "complex-type",
  "abstract" : false,
  "type" : "Ratio",
  "baseDefinition" : "http://hl7.org/fhir/StructureDefinition/Ratio",
  "derivation" : "constraint",
  "differential" : {
    "element" : [{
      "id" : "Ratio",
      "path" : "Ratio",
      "short" : "A measured ratio using UCUM",
      "definition" : "A measured ratio (or a ratio that can potentially be measured) and uncertainty of the measurement. This profile imposes that the code system for units be UCUM."
    },
    {
      "id" : "Ratio.extension:uncertainty",
      "path" : "Ratio.extension",
      "sliceName" : "uncertainty",
      "min" : 0,
      "max" : "1",
      "type" : [{
        "code" : "Extension",
        "profile" : ["http://hl7.org/fhir/StructureDefinition/iso21090-uncertainty|5.2.0"]
      }]
    },
    {
      "id" : "Ratio.extension:uncertaintyType",
      "path" : "Ratio.extension",
      "sliceName" : "uncertaintyType",
      "min" : 0,
      "max" : "1",
      "type" : [{
        "code" : "Extension",
        "profile" : ["http://hl7.org/fhir/StructureDefinition/iso21090-uncertaintyType|5.2.0"]
      }]
    },
    {
      "id" : "Ratio.numerator.system",
      "path" : "Ratio.numerator.system",
      "patternUri" : "http://unitsofmeasure.org"
    },
    {
      "id" : "Ratio.numerator.code",
      "path" : "Ratio.numerator.code",
      "min" : 1
    },
    {
      "id" : "Ratio.denominator.system",
      "path" : "Ratio.denominator.system",
      "patternUri" : "http://unitsofmeasure.org"
    },
    {
      "id" : "Ratio.denominator.code",
      "path" : "Ratio.denominator.code",
      "min" : 1
    }]
  }
}

```
