MyHealth@EU Core
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## Data Type Profile: RatioMyHealth - Detailed Descriptions

Active as of 2026-05-04

Definitions for the Ratio-myhealth data type profile.

- Key Elements Table
- Differential Elements Table
- Snapshot Elements Table

Guidance on how to interpret the contents of this table can be foundhere

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: ele-1
Is Modifier | false
Invariants | ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count())) rat-1: 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())`) rat-1: 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 | ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count())) ext-1: 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(Uncertainty type) (Extension Type: code)
Is Modifier | false
Summary | false
Invariants | ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count())) ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
6. Ratio.numerator
Definition | The value of the numerator.
Short | A measured amount using UCUMNumerator value
Control | 0..1
Type | Quantity(Quantity (MyHealth@EU))
Is Modifier | false
Must Support | true
Summary | true
Invariants | ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
8. Ratio.denominator
Definition | The value of the denominator.
Short | A measured amount using UCUMDenominator value
Control | 0..1
Type | Quantity(Quantity (MyHealth@EU))
Is Modifier | false
Must Support | true
Summary | true
Invariants | ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))

Guidance on how to interpret the contents of this table can be foundhere

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(Uncertainty type) (Extension Type: code)
6. Ratio.numerator
Short | A measured amount using UCUM
Type | Quantity(Quantity (MyHealth@EU))
Must Support | true
8. Ratio.denominator
Short | A measured amount using UCUM
Type | Quantity(Quantity (MyHealth@EU))
Must Support | true

Guidance on how to interpret the contents of this table can be foundhere

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: ele-1
Is Modifier | false
Invariants | ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) rat-1: 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 inter-element 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 | ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: 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 areUnordered and Open, and can be differentiated using the following discriminators: value @ url
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 | ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: 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(Uncertainty type) (Extension Type: code)
Is Modifier | false
Summary | false
Invariants | ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
10. Ratio.numerator
Definition | The value of the numerator.
Short | A measured amount using UCUM
Control | 0..1
Type | Quantity(Quantity (MyHealth@EU))
Is Modifier | false
Must Support | true
Summary | true
Invariants | ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
12. Ratio.denominator
Definition | The value of the denominator.
Short | A measured amount using UCUM
Control | 0..1
Type | Quantity(Quantity (MyHealth@EU))
Is Modifier | false
Must Support | true
Summary | true
Invariants | ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)