This page is part of the HL7 Europe Laboratory Report (v0.1.0: STU 1) based on FHIR (HL7® FHIR® Standard) R4. This is the current published version. For a full list of available versions, see the Directory of published versions
Active as of 20240226 
Definitions for the Ratioeulab data type profile.
Guidance on how to interpret the contents of this table can be found here
0. Ratio  
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. 
Short  A measured ratio using UCUM 
2. Ratio.extension:uncertainty  
Slice Name  uncertainty 
Control  0..1 
Type  Extension(uncertainty) (Extension Type: decimal) 
4. Ratio.extension:uncertaintyType  
Slice Name  uncertaintyType 
Control  0..1 
Type  Extension(uncertaintyType) (Extension Type: code) 
Guidance on how to interpret the contents of this table can be found here
0. Ratio  
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. A relationship of two Quantity values  expressed as a numerator and a denominator. 
Short  A measured ratio using UCUMA ratio of two Quantity values  a numerator and a denominator 
Comments  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. 
Control  0..* This element is affected by the following invariants: ele1 
Is Modifier  false 
Invariants  ele1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count())) rat1: Numerator and denominator SHALL both be present, or both are absent. If both are absent, there SHALL be some extension present ( (numerator.empty() xor denominator.exists()) and (numerator.exists() or extension.exists()) )rat1: Numerator and denominator SHALL both be present, or both are absent. If both are absent, there SHALL be some extension present ((numerator.empty() xor denominator.exists()) and (numerator.exists() or extension.exists())) 
2. Ratio.extension:uncertainty  
Slice Name  uncertainty 
Definition  The primary measure of variance/uncertainty of the value (the square root of the sum of the squares of the differences between all data points and the mean). 
Short  Standard Deviation (same units as the quantity) 
Comments  standardDeviation has the same units as the quantity. It is used to normalize the data for computing the distribution function. Applications that cannot deal with probability distributions can still get an idea about the confidence level by looking at standardDeviation. 
Control  0..1 
Type  Extension(uncertainty) (Extension Type: decimal) 
Is Modifier  false 
Summary  false 
Invariants  ele1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count())) ext1: Must have either extensions or value[x], not both (extension.exists() != value.exists()) 
4. Ratio.extension:uncertaintyType  
Slice Name  uncertaintyType 
Definition  A code specifying the type of probability distribution for the uncertainty. 
Short  Probability Distribution Type for uncertainty 
Comments  This is only meaningful if there is also an uncertainty extension. If there is an uncertainty extension with no type, this means that the probability distribution type is unknown. In that case, the uncertainty has the meaning of an informal guess. 
Control  0..1 
Type  Extension(uncertaintyType) (Extension Type: code) 
Is Modifier  false 
Summary  false 
Invariants  ele1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count())) ext1: Must have either extensions or value[x], not both (extension.exists() != value.exists()) 
6. Ratio.numerator  
Definition  A measured amount (or an amount that can potentially be measured). Note that measured amounts include amounts that are not precisely quantified, including amounts involving arbitrary units and floating currencies. This profile imposes that the code system for units be UCUM. The value of the numerator. 
Short  A measured amount using UCUMNumerator value 
Comments  The context of use may frequently define what kind of quantity this is and therefore what kind of units can be used. The context of use may also restrict the values for the comparator. 
Control  0..1 This element is affected by the following invariants: ele1 
Type  Quantity(Quantity (IPS)) 
Is Modifier  false 
Must Support  true 
Invariants  ele1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count())) qty3: If a code for the unit is present, the system SHALL also be present ( code.empty() or system.exists() ) 
8. Ratio.denominator  
Definition  A measured amount (or an amount that can potentially be measured). Note that measured amounts include amounts that are not precisely quantified, including amounts involving arbitrary units and floating currencies. This profile imposes that the code system for units be UCUM. The value of the denominator. 
Short  A measured amount using UCUMDenominator value 
Comments  The context of use may frequently define what kind of quantity this is and therefore what kind of units can be used. The context of use may also restrict the values for the comparator. 
Control  0..1 This element is affected by the following invariants: ele1 
Type  Quantity(Quantity (IPS)) 
Is Modifier  false 
Must Support  true 
Invariants  ele1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count())) qty3: If a code for the unit is present, the system SHALL also be present ( code.empty() or system.exists() ) 
Guidance on how to interpret the contents of this table can be found here
0. Ratio  
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. 
Short  A measured ratio using UCUM 
Comments  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. 
Control  0..* This element is affected by the following invariants: ele1 
Is Modifier  false 
Invariants  ele1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()) )rat1: Numerator and denominator SHALL both be present, or both are absent. If both are absent, there SHALL be some extension present ( (numerator.empty() xor denominator.exists()) and (numerator.exists() or extension.exists()) ) 
2. Ratio.id  
Definition  Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces. 
Short  Unique id for interelement referencing 
Control  0..1 
Type  string 
Is Modifier  false 
XML Format  In the XML format, this property is represented as an attribute. 
Summary  false 
4. Ratio.extension  
Definition  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 manageable, 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. 
Short  Additional content defined by implementations 
Comments  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. 
Control  0..* 
Type  Extension 
Is Modifier  false 
Summary  false 
Alternate Names  extensions, user content 
Invariants  ele1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()) )ext1: Must have either extensions or value[x], not both ( extension.exists() != value.exists() ) 
Slicing  This element introduces a set of slices on Ratio.extension . The slices are unordered and Open, and can be differentiated using the following discriminators:

6. Ratio.extension:uncertainty  
Slice Name  uncertainty 
Definition  The primary measure of variance/uncertainty of the value (the square root of the sum of the squares of the differences between all data points and the mean). 
Short  Standard Deviation (same units as the quantity) 
Comments  standardDeviation has the same units as the quantity. It is used to normalize the data for computing the distribution function. Applications that cannot deal with probability distributions can still get an idea about the confidence level by looking at standardDeviation. 
Control  0..1 
Type  Extension(uncertainty) (Extension Type: decimal) 
Is Modifier  false 
Summary  false 
Invariants  ele1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()) )ext1: Must have either extensions or value[x], not both ( extension.exists() != value.exists() ) 
8. Ratio.extension:uncertaintyType  
Slice Name  uncertaintyType 
Definition  A code specifying the type of probability distribution for the uncertainty. 
Short  Probability Distribution Type for uncertainty 
Comments  This is only meaningful if there is also an uncertainty extension. If there is an uncertainty extension with no type, this means that the probability distribution type is unknown. In that case, the uncertainty has the meaning of an informal guess. 
Control  0..1 
Type  Extension(uncertaintyType) (Extension Type: code) 
Is Modifier  false 
Summary  false 
Invariants  ele1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()) )ext1: Must have either extensions or value[x], not both ( extension.exists() != value.exists() ) 
10. Ratio.numerator  
Definition  A measured amount (or an amount that can potentially be measured). Note that measured amounts include amounts that are not precisely quantified, including amounts involving arbitrary units and floating currencies. This profile imposes that the code system for units be UCUM. 
Short  A measured amount using UCUM 
Comments  The context of use may frequently define what kind of quantity this is and therefore what kind of units can be used. The context of use may also restrict the values for the comparator. 
Control  0..1 This element is affected by the following invariants: ele1 
Type  Quantity(Quantity (IPS)) 
Is Modifier  false 
Must Support  true 
Invariants  ele1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()) )qty3: If a code for the unit is present, the system SHALL also be present ( code.empty() or system.exists() ) 
12. Ratio.denominator  
Definition  A measured amount (or an amount that can potentially be measured). Note that measured amounts include amounts that are not precisely quantified, including amounts involving arbitrary units and floating currencies. This profile imposes that the code system for units be UCUM. 
Short  A measured amount using UCUM 
Comments  The context of use may frequently define what kind of quantity this is and therefore what kind of units can be used. The context of use may also restrict the values for the comparator. 
Control  0..1 This element is affected by the following invariants: ele1 
Type  Quantity(Quantity (IPS)) 
Is Modifier  false 
Must Support  true 
Invariants  ele1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()) )qty3: If a code for the unit is present, the system SHALL also be present ( code.empty() or system.exists() ) 