MyHealth@EU Core
1.0.0 - trial-use 150

MyHealth@EU Core - Local Development build (v1.0.0) built by the FHIR (HL7® FHIR® Standard) Build Tools. See the Directory of published versions

## Data Type Profile: Quantity (MyHealth@EU)

Official URL: http://fhir.ehdsi.eu/core/StructureDefinition/Quantity-myhealth | Version: 1.0.0
Active as of 2026-05-05 | Computable Name: QuantityMyHealth

This profile of the Quantity data type constraints the Quantity (MyHealth@EU) profile defining a core value set for UCUM. The Quantity (MyHealth@EU) imposes the usage of the UCUM as the code system for units and allows expressing uncertainty of measurement.

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

Usages:

- Derived from this DataType Profile: Simple Quantity (MyHealth@EU)
- Use this DataType Profile: Ratio (MyHealth@EU) and Observation: Medical Test Result (Core)

You can also check for usages in the FHIR IG Statistics

### Formal Views of Profile Content

Description of Profiles, Differentials, Snapshots and how the different presentations work.

- Key Elements Table
- Differential Table
- Snapshot Table
- Statistics/References
- All

Name | Flags | Card. | Type | Description & Constraints Filter: Bindings Constraints Obligations
--- | --- | --- | --- | ---
Quantity | C | 0..* | Quantity | A measured amount using UCUM Constraints: qty-3
Slices for extension |  |  |  | Content/Rules for all slices
extension:uncertainty |  | 0..1 | decimal | Standard Deviation (same units as the quantity) URL: http://hl7.org/fhir/StructureDefinition/iso21090-uncertainty
extension:uncertaintyType |  | 0..1 | code | Probability Distribution Type for uncertainty URL: http://hl7.org/fhir/StructureDefinition/iso21090-uncertaintyType Binding: ProbabilityDistributionType (required)
comparator | ?!Σ | 0..1 | code | < | <= | >= | > - how to understand the value Binding: QuantityComparator (required): How the Quantity should be understood and represented.
system | S Σ C | 1..1 | uri | UCUM or EDQM system for units Constraints: myhealth-allowed-systems
code | S Σ | 1..1 | code | Coded form of the unit Binding: eHDSI Unit (extensible)
Additional Bindings | Purpose | Documentation
eHDSI Quantity Unit | Extensible | A unit of presentation used to represent the quantity of product
Documentation for this format

#### Terminology Bindings

Path | Status | Usage | ValueSet | Version | Source
Quantity.comparator | Base | required | QuantityComparator | 📍4.0.1 | FHIR Std.
Quantity.code | Base | extensible | eHDSI Unit | 📦9.1.0 | This IG

#### Constraints

Id | Grade | Path(s) | Description | Expression
ele-1 | error | **ALL** elements | All FHIR elements must have a @value or children | `hasValue() or (children().count() > id.count())`
ext-1 | error | **ALL** extensions | Must have either extensions or value[x], not both | `extension.exists() != value.exists()`
myhealth-allowed-systems | error | Quantity.system | The system for the quantity unit must be either UCUM or EDQM. | `$this = 'http://unitsofmeasure.org' or $this = 'http://standardterms.edqm.eu'`
qty-3 | error | Quantity | If a code for the unit is present, the system SHALL also be present | `code.empty() or system.exists()`

This structure is derived from Quantity

Name | Flags | Card. | Type | Description & Constraints Filter: Bindings Constraints Obligations
--- | --- | --- | --- | ---
Quantity |  | 0..* | Quantity | A measured amount using UCUM
Slices for extension |  |  |  | Content/Rules for all slices
extension:uncertainty |  | 0..1 | decimal | Standard Deviation (same units as the quantity) URL: http://hl7.org/fhir/StructureDefinition/iso21090-uncertainty
extension:uncertaintyType |  | 0..1 | code | Probability Distribution Type for uncertainty URL: http://hl7.org/fhir/StructureDefinition/iso21090-uncertaintyType Binding: ProbabilityDistributionType (required)
system | S C | 1..1 | uri | UCUM or EDQM system for units Constraints: myhealth-allowed-systems
code | S | 1..1 | code | Coded form of the unit Binding: eHDSI Unit (extensible)
Additional Bindings | Purpose | Documentation
eHDSI Quantity Unit | Extensible | A unit of presentation used to represent the quantity of product
Documentation for this format

#### Terminology Bindings (Differential)

Path | Status | Usage | ValueSet | Version | Source
Quantity.code | Base | extensible | eHDSI Unit | 📦9.1.0 | This IG

#### Constraints

Id | Grade | Path(s) | Description | Expression
myhealth-allowed-systems | error | Quantity.system | The system for the quantity unit must be either UCUM or EDQM. | `$this = 'http://unitsofmeasure.org' or $this = 'http://standardterms.edqm.eu'`

Name | Flags | Card. | Type | Description & Constraints Filter: Bindings Constraints Obligations
--- | --- | --- | --- | ---
Quantity | C | 0..* | Quantity | A measured amount using UCUM Constraints: qty-3
id |  | 0..1 | string | Unique id for inter-element referencing
Slices for extension |  | 0..* | Extension | Additional content defined by implementations Slice: Unordered, Open by value:url
extension:uncertainty |  | 0..1 | decimal | Standard Deviation (same units as the quantity) URL: http://hl7.org/fhir/StructureDefinition/iso21090-uncertainty
extension:uncertaintyType |  | 0..1 | code | Probability Distribution Type for uncertainty URL: http://hl7.org/fhir/StructureDefinition/iso21090-uncertaintyType Binding: ProbabilityDistributionType (required)
value | Σ | 0..1 | decimal | Numerical value (with implicit precision)
comparator | ?!Σ | 0..1 | code | < | <= | >= | > - how to understand the value Binding: QuantityComparator (required): How the Quantity should be understood and represented.
unit | Σ | 0..1 | string | Unit representation
system | S Σ C | 1..1 | uri | UCUM or EDQM system for units Constraints: myhealth-allowed-systems
code | S Σ | 1..1 | code | Coded form of the unit Binding: eHDSI Unit (extensible)
Additional Bindings | Purpose | Documentation
eHDSI Quantity Unit | Extensible | A unit of presentation used to represent the quantity of product
Documentation for this format

#### Terminology Bindings

Path | Status | Usage | ValueSet | Version | Source
Quantity.comparator | Base | required | QuantityComparator | 📍4.0.1 | FHIR Std.
Quantity.code | Base | extensible | eHDSI Unit | 📦9.1.0 | This IG

#### Constraints

Id | Grade | Path(s) | Description | Expression
ele-1 | error | **ALL** elements | All FHIR elements must have a @value or children | `hasValue() or (children().count() > id.count())`
ext-1 | error | **ALL** extensions | Must have either extensions or value[x], not both | `extension.exists() != value.exists()`
myhealth-allowed-systems | error | Quantity.system | The system for the quantity unit must be either UCUM or EDQM. | `$this = 'http://unitsofmeasure.org' or $this = 'http://standardterms.edqm.eu'`
qty-3 | error | Quantity | If a code for the unit is present, the system SHALL also be present | `code.empty() or system.exists()`

This structure is derived from Quantity

Summary

Mandatory: 2 elements
Must-Support: 2 elements

Extensions

This structure refers to these extensions:

- http://hl7.org/fhir/StructureDefinition/iso21090-uncertainty|5.2.0
- http://hl7.org/fhir/StructureDefinition/iso21090-uncertaintyType|5.2.0

Key Elements View

Name | Flags | Card. | Type | Description & Constraints Filter: Bindings Constraints Obligations
--- | --- | --- | --- | ---
Quantity | C | 0..* | Quantity | A measured amount using UCUM Constraints: qty-3
Slices for extension |  |  |  | Content/Rules for all slices
extension:uncertainty |  | 0..1 | decimal | Standard Deviation (same units as the quantity) URL: http://hl7.org/fhir/StructureDefinition/iso21090-uncertainty
extension:uncertaintyType |  | 0..1 | code | Probability Distribution Type for uncertainty URL: http://hl7.org/fhir/StructureDefinition/iso21090-uncertaintyType Binding: ProbabilityDistributionType (required)
comparator | ?!Σ | 0..1 | code | < | <= | >= | > - how to understand the value Binding: QuantityComparator (required): How the Quantity should be understood and represented.
system | S Σ C | 1..1 | uri | UCUM or EDQM system for units Constraints: myhealth-allowed-systems
code | S Σ | 1..1 | code | Coded form of the unit Binding: eHDSI Unit (extensible)
Additional Bindings | Purpose | Documentation
eHDSI Quantity Unit | Extensible | A unit of presentation used to represent the quantity of product
Documentation for this format

#### Terminology Bindings

Path | Status | Usage | ValueSet | Version | Source
Quantity.comparator | Base | required | QuantityComparator | 📍4.0.1 | FHIR Std.
Quantity.code | Base | extensible | eHDSI Unit | 📦9.1.0 | This IG

#### Constraints

Id | Grade | Path(s) | Description | Expression
ele-1 | error | **ALL** elements | All FHIR elements must have a @value or children | `hasValue() or (children().count() > id.count())`
ext-1 | error | **ALL** extensions | Must have either extensions or value[x], not both | `extension.exists() != value.exists()`
myhealth-allowed-systems | error | Quantity.system | The system for the quantity unit must be either UCUM or EDQM. | `$this = 'http://unitsofmeasure.org' or $this = 'http://standardterms.edqm.eu'`
qty-3 | error | Quantity | If a code for the unit is present, the system SHALL also be present | `code.empty() or system.exists()`

Differential View

This structure is derived from Quantity

Name | Flags | Card. | Type | Description & Constraints Filter: Bindings Constraints Obligations
--- | --- | --- | --- | ---
Quantity |  | 0..* | Quantity | A measured amount using UCUM
Slices for extension |  |  |  | Content/Rules for all slices
extension:uncertainty |  | 0..1 | decimal | Standard Deviation (same units as the quantity) URL: http://hl7.org/fhir/StructureDefinition/iso21090-uncertainty
extension:uncertaintyType |  | 0..1 | code | Probability Distribution Type for uncertainty URL: http://hl7.org/fhir/StructureDefinition/iso21090-uncertaintyType Binding: ProbabilityDistributionType (required)
system | S C | 1..1 | uri | UCUM or EDQM system for units Constraints: myhealth-allowed-systems
code | S | 1..1 | code | Coded form of the unit Binding: eHDSI Unit (extensible)
Additional Bindings | Purpose | Documentation
eHDSI Quantity Unit | Extensible | A unit of presentation used to represent the quantity of product
Documentation for this format

#### Terminology Bindings (Differential)

Path | Status | Usage | ValueSet | Version | Source
Quantity.code | Base | extensible | eHDSI Unit | 📦9.1.0 | This IG

#### Constraints

Id | Grade | Path(s) | Description | Expression
myhealth-allowed-systems | error | Quantity.system | The system for the quantity unit must be either UCUM or EDQM. | `$this = 'http://unitsofmeasure.org' or $this = 'http://standardterms.edqm.eu'`

Snapshot View

Name | Flags | Card. | Type | Description & Constraints Filter: Bindings Constraints Obligations
--- | --- | --- | --- | ---
Quantity | C | 0..* | Quantity | A measured amount using UCUM Constraints: qty-3
id |  | 0..1 | string | Unique id for inter-element referencing
Slices for extension |  | 0..* | Extension | Additional content defined by implementations Slice: Unordered, Open by value:url
extension:uncertainty |  | 0..1 | decimal | Standard Deviation (same units as the quantity) URL: http://hl7.org/fhir/StructureDefinition/iso21090-uncertainty
extension:uncertaintyType |  | 0..1 | code | Probability Distribution Type for uncertainty URL: http://hl7.org/fhir/StructureDefinition/iso21090-uncertaintyType Binding: ProbabilityDistributionType (required)
value | Σ | 0..1 | decimal | Numerical value (with implicit precision)
comparator | ?!Σ | 0..1 | code | < | <= | >= | > - how to understand the value Binding: QuantityComparator (required): How the Quantity should be understood and represented.
unit | Σ | 0..1 | string | Unit representation
system | S Σ C | 1..1 | uri | UCUM or EDQM system for units Constraints: myhealth-allowed-systems
code | S Σ | 1..1 | code | Coded form of the unit Binding: eHDSI Unit (extensible)
Additional Bindings | Purpose | Documentation
eHDSI Quantity Unit | Extensible | A unit of presentation used to represent the quantity of product
Documentation for this format

#### Terminology Bindings

Path | Status | Usage | ValueSet | Version | Source
Quantity.comparator | Base | required | QuantityComparator | 📍4.0.1 | FHIR Std.
Quantity.code | Base | extensible | eHDSI Unit | 📦9.1.0 | This IG

#### Constraints

Id | Grade | Path(s) | Description | Expression
ele-1 | error | **ALL** elements | All FHIR elements must have a @value or children | `hasValue() or (children().count() > id.count())`
ext-1 | error | **ALL** extensions | Must have either extensions or value[x], not both | `extension.exists() != value.exists()`
myhealth-allowed-systems | error | Quantity.system | The system for the quantity unit must be either UCUM or EDQM. | `$this = 'http://unitsofmeasure.org' or $this = 'http://standardterms.edqm.eu'`
qty-3 | error | Quantity | If a code for the unit is present, the system SHALL also be present | `code.empty() or system.exists()`

This structure is derived from Quantity

Summary

Mandatory: 2 elements
Must-Support: 2 elements

Extensions

This structure refers to these extensions:

- http://hl7.org/fhir/StructureDefinition/iso21090-uncertainty|5.2.0
- http://hl7.org/fhir/StructureDefinition/iso21090-uncertaintyType|5.2.0

Other representations of profile: CSV, Excel, Schematron