StructureDefinition
for
Ratio
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padding:0px 4px 0px 4pxA ratio of two Quantity values - a numerator and a denominator
+ Numerator and denominator SHALL both be present, or both are absent. If both are absent,
there SHALL be some extension present
Elements defined in Ancestors:
unique id for the element within a resource (for internal references). This may be any
string value that does not contain spaces.,
May be used to represent additional information that is not part of the basic definition
of the element. In order to make the use of extensions safe and manageable, there is a
strict set of governance applied to the definition and use of extensions. Though any
implementer is allowed to define an extension, there is a set of requirements that SHALL
be met as part of the definition of the extension.
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<?xml version="1.0" encoding="UTF-8"?>
Documentation for this format
Numerator and denominator SHALL both be present, or both are absent. If both are absent,
there SHALL be some extension present
(count(f:numerator) = count(f:denominator)) and ((count(f:numerator) > 0) or (count(f:extension)
> 0))
unique id for the element within a resource (for internal references). This may be any
string value that does not contain spaces.
<StructureDefinition xmlns="http://hl7.org/fhir">
<id value="Ratio"/>
<text>
<status value="generated"/>
<div xmlns="http://www.w3.org/1999/xhtml">
<table border="0" cellpadding="0" cellspacing="0" style="border: 0px #F0F0F0 solid; font-size: 11px; font-family: verdana; vertical-align:
top;">
<tr style="border: 1px #F0F0F0 solid; font-size: 11px; font-family: verdana; vertical-align:
top">
<th class="hierarchy" style="vertical-align: top; text-align : var(--ig-left,left); background-color: white;
border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px; padding-top: 3px; padding-bottom:
3px">
<a href="https://build.fhir.org/ig/FHIR/ig-guidance/readingIgs.html#table-views" title="The logical name of the element">Name</a> </th> <th class="hierarchy" style="vertical-align: top; text-align : var(--ig-left,left); background-color: white;
border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px; padding-top: 3px; padding-bottom:
3px">
<a href="https://build.fhir.org/ig/FHIR/ig-guidance/readingIgs.html#table-views" title="Information about the use of the element">Flags</a> </th> <th class="hierarchy" style="vertical-align: top; text-align : var(--ig-left,left); background-color: white;
border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px; padding-top: 3px; padding-bottom:
3px">
<a href="https://build.fhir.org/ig/FHIR/ig-guidance/readingIgs.html#table-views" title="Minimum and Maximum # of times the element can appear in the instance">Card.</a> </th> <th class="hierarchy" style="vertical-align: top; text-align : var(--ig-left,left); background-color: white;
border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px; padding-top: 3px; padding-bottom:
3px; width: 100px">
<a href="https://build.fhir.org/ig/FHIR/ig-guidance/readingIgs.html#table-views" title="Reference to the type of the element">Type</a> </th> <th class="hierarchy" style="vertical-align: top; text-align : var(--ig-left,left); background-color: white;
border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px; padding-top: 3px; padding-bottom:
3px">
<a href="https://build.fhir.org/ig/FHIR/ig-guidance/readingIgs.html#table-views" title="Additional information about the element">Description & Constraints</a> <span style="float: right"> <a href="https://build.fhir.org/ig/FHIR/ig-guidance/readingIgs.html#table-views" title="Legend for this format"> <img alt="doco" src="data:(snipped in html view)" style="background-color: inherit"/> </a> </span> </th> </tr> <tr style="border: 0px #F0F0F0 solid; padding:0px; vertical-align: top; background-color:
white">
<td class="hierarchy" style="vertical-align: top; text-align : var(--ig-left,left); background-color: white;
border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px; white-space: nowrap; background-image:
url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAyAAAAACCAYAAACg/LjIAAAAJUlEQVR4Xu3IIQEAAAg
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<img alt="." class="hierarchy" src="data:(snipped in html view)" style="background-color: inherit"/> <img alt="." class="hierarchy" src="data:(snipped in html view)" style="background-color: white; background-color: inherit" title="Element"/> <a href="datatypes-definitions.html#Ratio" title="Ratio : A relationship of two Quantity values - expressed as a numerator and a
denominator.">Ratio</a>
</td> <td class="hierarchy" style="vertical-align: top; text-align : var(--ig-left,left); background-color: white;
border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px">
<a href="elementdefinition-definitions.html#ElementDefinition.isSummary" style="padding-left: 3px; padding-right: 3px; color: black; null; padding-left: 3px; padding-right:
3px; color: black; null" title="This element is included in summaries">Σ</a>
<a href="versions.html#std-process" style="padding-left: 3px; padding-right: 3px; border: 1px grey solid; font-weight: bold;
color: black; background-color: #e6ffe6; padding-left: 3px; padding-right: 3px;
border: 1px grey solid; font-weight: bold; color: black; background-color: #e6ffe6" title="Standards Status = Normative">N</a>
</td> <td class="hierarchy" style="vertical-align: top; text-align : var(--ig-left,left); background-color: white;
border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px"/>
<td class="hierarchy" style="vertical-align: top; text-align : var(--ig-left,left); background-color: white;
border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px">
<a href="types.html#Element">Element</a> </td> <td class="hierarchy" style="vertical-align: top; text-align : var(--ig-left,left); background-color: white;
border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px">A ratio of two Quantity values - a numerator and a denominator
<br/> <span style="font-style: italic" title="rat-1">+ Rule: Numerator and denominator SHALL both be present, or both are absent. If
both are absent, there SHALL be some extension present</span>
<br/> <br/> Elements defined in Ancestors: <a href="types.html#Element" title="Unique id for the element within a resource (for internal references). This may
be any string value that does not contain spaces.">id</a> ,
<a href="types.html#Element" title="May be used to represent additional information that is not part of the basic definition
of the element. To make the use of extensions safe and managable, there is a strict
set of governance applied to the definition and use of extensions. Though any implementer
can define an extension, there is a set of requirements that SHALL be met as part
of the definition of the extension.">extension</a>
</td> </tr> <tr style="border: 0px #F0F0F0 solid; padding:0px; vertical-align: top; background-color:
#F7F7F7">
<td class="hierarchy" style="vertical-align: top; text-align : var(--ig-left,left); background-color: #F7F7F7;
border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px; white-space: nowrap; background-image:
url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAyAAAAACCAYAAACg/LjIAAAALUlEQVR4Xu3IoREAIAw
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<img alt="." class="hierarchy" src="data:(snipped in html view)" style="background-color: inherit"/> <img alt="." class="hierarchy" src="data:(snipped in html view)" style="background-color: inherit"/> <img alt="." class="hierarchy" src="data:(snipped in html view)" style="background-color: #F7F7F7; background-color: inherit" title="Data Type"/> <a href="datatypes-definitions.html#Ratio.numerator" title="Ratio.numerator : The value of the numerator.">numerator</a> </td> <td class="hierarchy" style="vertical-align: top; text-align : var(--ig-left,left); background-color: #F7F7F7;
border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px">
<a href="elementdefinition-definitions.html#ElementDefinition.isSummary" style="padding-left: 3px; padding-right: 3px; color: black; null; padding-left: 3px; padding-right:
3px; color: black; null" title="This element is included in summaries">Σ</a>
<a href="conformance-rules.html#constraints" style="padding-left: 3px; padding-right: 3px; border: 1px maroon solid; font-weight: bold;
color: #301212; background-color: #fdf4f4;; padding-left: 3px; padding-right: 3px;
border: 1px maroon solid; font-weight: bold; color: #301212; background-color:
#fdf4f4;" title="This element has or is affected by some invariants">C</a>
</td> <td class="hierarchy" style="vertical-align: top; text-align : var(--ig-left,left); background-color: #F7F7F7;
border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px">0..1</td>
<td class="hierarchy" style="vertical-align: top; text-align : var(--ig-left,left); background-color: #F7F7F7;
border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px">
<a href="datatypes.html#Quantity">Quantity</a> </td> <td class="hierarchy" style="vertical-align: top; text-align : var(--ig-left,left); background-color: #F7F7F7;
border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px">Numerator value
<br/> </td> </tr> <tr style="border: 0px #F0F0F0 solid; padding:0px; vertical-align: top; background-color:
white">
<td class="hierarchy" style="vertical-align: top; text-align : var(--ig-left,left); background-color: white;
border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px; white-space: nowrap; background-image:
url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAyAAAAACCAYAAACg/LjIAAAAJUlEQVR4Xu3IIQEAAAg
DsHd9/w4EQIOamFnaBgAA4MMKAACAKwNp30CqZFfFmwAAAABJRU5ErkJggg==)">
<img alt="." class="hierarchy" src="data:(snipped in html view)" style="background-color: inherit"/> <img alt="." class="hierarchy" src="data:(snipped in html view)" style="background-color: inherit"/> <img alt="." class="hierarchy" src="data:(snipped in html view)" style="background-color: white; background-color: inherit" title="Data Type"/> <a href="datatypes-definitions.html#Ratio.denominator" title="Ratio.denominator : The value of the denominator.">denominator</a> </td> <td class="hierarchy" style="vertical-align: top; text-align : var(--ig-left,left); background-color: white;
border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px">
<a href="elementdefinition-definitions.html#ElementDefinition.isSummary" style="padding-left: 3px; padding-right: 3px; color: black; null; padding-left: 3px; padding-right:
3px; color: black; null" title="This element is included in summaries">Σ</a>
<a href="conformance-rules.html#constraints" style="padding-left: 3px; padding-right: 3px; border: 1px maroon solid; font-weight: bold;
color: #301212; background-color: #fdf4f4;; padding-left: 3px; padding-right: 3px;
border: 1px maroon solid; font-weight: bold; color: #301212; background-color:
#fdf4f4;" title="This element has or is affected by some invariants">C</a>
</td> <td class="hierarchy" style="vertical-align: top; text-align : var(--ig-left,left); background-color: white;
border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px">0..1</td>
<td class="hierarchy" style="vertical-align: top; text-align : var(--ig-left,left); background-color: white;
border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px">
<a href="datatypes.html#SimpleQuantity">SimpleQuantity</a> </td> <td class="hierarchy" style="vertical-align: top; text-align : var(--ig-left,left); background-color: white;
border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px">Denominator value
<br/> </td> </tr> <tr> <td class="hierarchy" colspan="5"> <br/> <a href="https://build.fhir.org/ig/FHIR/ig-guidance/readingIgs.html#table-views" title="Legend for this format"> <img alt="doco" src="data:(snipped in html view)" style="background-color: inherit"/> Documentation for this format </a> </td> </tr> </table> </div> </text> <extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-standards-status"> <valueCode value="normative"/> </extension> <extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-wg"> <valueCode value="fhir"/> </extension> <url value="http://hl7.org/fhir/StructureDefinition/Ratio"/> <version value="6.0.0-ballot3"/> <name value="Ratio"/> <status value="active"/> <experimental value="false"/> <date value="2025-12-17T09:50:17+00:00"/> <publisher value="HL7 International / FHIR Infrastructure"/> <contact> <telecom> <system value="url"/> <value value="http://hl7.org/fhir"/> </telecom> </contact> <contact> <telecom> <system value="url"/> <value value="http://www.hl7.org/Special/committees/fiwg"/> </telecom> </contact> <description value="Ratio Type: A relationship of two Quantity values - expressed as a numerator and
a denominator."/>
<jurisdiction> <coding> <system value="http://unstats.un.org/unsd/methods/m49/m49.htm"/> <code value="001"/> <display value="World"/> </coding> </jurisdiction> <purpose value="Need to able to capture ratios for some measurements (titers) and some rates (costs)."/> <fhirVersion value="6.0.0-ballot3"/> <mapping> <identity value="v2"/> <uri value="http://hl7.org/v2"/> <name value="HL7 V2 Mapping"/> </mapping> <mapping> <identity value="rim"/> <uri value="http://hl7.org/v3"/> <name value="RIM Mapping"/> </mapping> <kind value="complex-type"/> <abstract value="false"/> <type value="Ratio"/> <baseDefinition value="http://hl7.org/fhir/StructureDefinition/DataType"/> <derivation value="specialization"/> <snapshot> <element id="Ratio"> <path value="Ratio"/> <short value="A ratio of two Quantity values - a numerator and a denominator"/> <definition value="A relationship of two Quantity values - expressed as a numerator and a denominator."/> <comment value="The Ratio datatype should only be used to express a relationship of two numbers
if the relationship cannot be suitably expressed using a Quantity and a common
unit. Where the denominator value is known to be fixed to "1", Quantity
should be used instead of Ratio."/>
<min value="0"/> <max value="*"/> <base> <path value="Ratio"/> <min value="0"/> <max value="*"/> </base> <constraint> <key value="ele-1"/> <severity value="error"/> <human value="All FHIR elements must have a @value or children"/> <expression value="hasValue() or (children().count() > id.count())"/> <source value="http://hl7.org/fhir/StructureDefinition/Element"/> </constraint> <constraint> <key value="rat-1"/> <severity value="error"/> <human value="Numerator and denominator SHALL both be present, or both are absent. If both are
absent, there SHALL be some extension present"/>
<expression value="(numerator.exists() and denominator.exists()) or (numerator.empty() and denominator.empty()
and extension.exists())"/>
<source value="http://hl7.org/fhir/StructureDefinition/Ratio"/> </constraint> <isModifier value="false"/> <mapping> <identity value="rim"/> <map value="n/a,RTO"/> </mapping> <mapping> <identity value="v2"/> <map value="N/A"/> </mapping> </element> <element id="Ratio.id"> <path value="Ratio.id"/> <representation value="xmlAttr"/> <short value="Unique id for inter-element referencing"/> <definition value="Unique id for the element within a resource (for internal references). This may
be any string value that does not contain spaces."/>
<min value="0"/> <max value="1"/> <base> <path value="Element.id"/> <min value="0"/> <max value="1"/> </base>
<type> <extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-fhir-type"> <valueUrl value="string"/> </extension> <code value="http://hl7.org/fhirpath/System.String"/> </type> <condition value="ele-1"/> <isModifier value="false"/> <isSummary value="false"/> <mapping> <identity value="rim"/> <map value="n/a"/> </mapping> </element> <element id="Ratio.extension"> <path value="Ratio.extension"/> <slicing> <discriminator> <type value="value"/> <path value="url"/> </discriminator> <description value="Extensions are always sliced by (at least) url"/> <rules value="open"/> </slicing> <short value="Additional content defined by implementations"/>
<definition value="May be used to represent additional information that is not part of the basic definition
of the element. In order to make the use of extensions safe and manageable, there is a
strict set of governance applied to the definition and use of extensions. Though any
implementer is allowed to define an extension, there is a set of requirements that SHALL
be met as part of the definition of the extension.
There can be no stigma associated with the use of extensions by any application, project,
or standard - regardless of the institution or jurisdiction that uses or defines the extensions.
The use of extensions is what allows the FHIR specification to retain a core level of
simplicity for everyone.
Numerator and denominator SHALL both be present, or both are absent. If both are absent,
there SHALL be some extension present
(count(f:numerator) = count(f:denominator)) and ((count(f:numerator) > 0) or (count(f:extension)
> 0))
of the element. To make the use of extensions safe and managable, there is a strict
set of governance applied to the definition and use of extensions. Though any implementer
can define an extension, there is a set of requirements that SHALL be met as part
of the definition of the extension."/>
<comment value="There can be no stigma associated with the use of extensions by any application,
project, or standard - regardless of the institution or jurisdiction that uses
or defines the extensions. The use of extensions is what allows the FHIR specification
to retain a core level of simplicity for everyone."/>
<alias value="extensions"/> <alias value="user content"/> <min value="0"/> <max value="*"/> <base> <path value="Element.extension"/> <min value="0"/> <max value="*"/> </base> <type> <code value="Extension"/> </type> <constraint> <key value="ele-1"/> <severity value="error"/> <human value="All FHIR elements must have a @value or children"/> <expression value="hasValue() or (children().count() > id.count())"/> <source value="http://hl7.org/fhir/StructureDefinition/Element"/> </constraint> <isModifier value="false"/> <isSummary value="false"/> <mapping> <identity value="rim"/> <map value="n/a"/> </mapping> </element> <element id="Ratio.numerator"> <path value="Ratio.numerator"/> <short value="Numerator value"/> <definition value="The value of the numerator."/> <min value="0"/> <max value="1"/> <base> <path value="Ratio.numerator"/> <min value="0"/> <max value="1"/> </base> <type> <code value="Quantity"/> </type> <condition value="rat-1"/> <constraint> <key value="ele-1"/> <severity value="error"/> <human value="All FHIR elements must have a @value or children"/> <expression value="hasValue() or (children().count() > id.count())"/> <source value="http://hl7.org/fhir/StructureDefinition/Element"/> </constraint> <isModifier value="false"/> <isSummary value="true"/> <mapping> <identity value="rim"/> <map value=".numerator"/> </mapping> </element> <element id="Ratio.denominator"> <path value="Ratio.denominator"/> <short value="Denominator value"/> <definition value="The value of the denominator."/> <min value="0"/> <max value="1"/> <base> <path value="Ratio.denominator"/> <min value="0"/> <max value="1"/> </base> <type> <code value="Quantity"/> <profile value="http://hl7.org/fhir/StructureDefinition/SimpleQuantity"/> </type> <condition value="rat-1"/> <constraint> <key value="ele-1"/> <severity value="error"/> <human value="All FHIR elements must have a @value or children"/> <expression value="hasValue() or (children().count() > id.count())"/> <source value="http://hl7.org/fhir/StructureDefinition/Element"/> </constraint> <isModifier value="false"/> <isSummary value="true"/> <mapping> <identity value="rim"/> <map value=".denominator"/> </mapping> </element> </snapshot> <differential> <element id="Ratio"> <path value="Ratio"/> <short value="A ratio of two Quantity values - a numerator and a denominator"/> <definition value="A relationship of two Quantity values - expressed as a numerator and a denominator."/> <comment value="The Ratio datatype should only be used to express a relationship of two numbers
if the relationship cannot be suitably expressed using a Quantity and a common
unit. Where the denominator value is known to be fixed to "1", Quantity
should be used instead of Ratio."/>
<min value="0"/> <max value="*"/> <constraint> <key value="rat-1"/> <severity value="error"/> <human value="Numerator and denominator SHALL both be present, or both are absent. If both are
absent, there SHALL be some extension present"/>
<expression value="(numerator.exists() and denominator.exists()) or (numerator.empty() and denominator.empty()
and extension.exists())"/>
<source value="http://hl7.org/fhir/StructureDefinition/Ratio"/> </constraint> <mapping> <identity value="v2"/> <map value="N/A"/> </mapping> <mapping> <identity value="rim"/> <map value="RTO"/> </mapping> </element> <element id="Ratio.numerator"> <path value="Ratio.numerator"/> <short value="Numerator value"/> <definition value="The value of the numerator."/> <min value="0"/> <max value="1"/> <type> <code value="Quantity"/> </type> <condition value="rat-1"/> <isSummary value="true"/> <mapping> <identity value="rim"/> <map value=".numerator"/> </mapping> </element> <element id="Ratio.denominator"> <path value="Ratio.denominator"/> <short value="Denominator value"/> <definition value="The value of the denominator."/> <min value="0"/> <max value="1"/> <type> <code value="Quantity"/> <profile value="http://hl7.org/fhir/StructureDefinition/SimpleQuantity"/> </type> <condition value="rat-1"/> <isSummary value="true"/> <mapping> <identity value="rim"/> <map value=".denominator"/> </mapping> </element> </differential>
</
StructureDefinition
>
Usage
note:
every
effort
has
been
made
to
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the
examples
are
correct
and
useful,
but
they
are
not
a
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specification.
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