CH EMED EPR
1.0.0 - trial-use Switzerland flag

This page is part of the FHIR eMedication exchange formats for the implementation effort of CARA within its EPR community (v1.0.0: STU1) based on FHIR (HL7® FHIR® Standard) R4. This is the current published version in its permanent home (it will always be available at this URL). For a full list of available versions, see the Directory of published versions

Data Type Profile: CHEMEDEPRAmountQuantity - Detailed Descriptions

Draft as of 2024-01-26

Definitions for the ch-emed-epr-amount-quantity data type profile.

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

0. Quantity
2. Quantity.id
Definition

Implementers should not set or read this element. This element is only kept as optional to allow submission of documents that would contain a value, since those documents are still readable by others. The meaning of this element is undefined in this profile.

Short✕ This element is not supported
Standards StatusDraft (from Normative)
4. Quantity.extension
Definition

Implementers should not set or read this element. This element is only kept as optional to allow submission of documents that would contain a value, since those documents are still readable by others. The meaning of this element is undefined in this profile.

Short✕ This element is not supported
Standards StatusDraft (from Normative)
6. Quantity.value
Invariantsamount-quantity-int-or-simple-decimal: An amount quantity should be either an integer, or a decimal that ends with '.25', '.5', or '.75' for non-scientific units (like tablets, pillules, ampules, etc.) ($this.toString().contains('.').not() or $this.toString().endsWith('.25') or $this.toString().endsWith('.5') or $this.toString().endsWith('.75'))
8. Quantity.comparator
Comments

...All modifiers SHALL be documented in the profile, in order to be usable.

10. Quantity.code
BindingThe codes SHALL be taken from Amount Quantity Unit Codes
(required to http://fhir.ch/ig/ch-emed-epr/ValueSet/ch-emed-epr-amount-quantity-unit-code

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

0. Quantity
Definition

The comparator is not used on a SimpleQuantity


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.

ShortA fixed quantity (no comparator)A measured or measurable amount
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.

Control0..*
This element is affected by the following invariants: ele-1
Is Modifierfalse
Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
qty-3: If a code for the unit is present, the system SHALL also be present (code.empty() or system.exists())
sqty-1: The comparator is not used on a SimpleQuantity (comparator.empty())
qty-3: If a code for the unit is present, the system SHALL also be present (code.empty() or system.exists())
2. Quantity.id
Definition

Implementers should not set or read this element. This element is only kept as optional to allow submission of documents that would contain a value, since those documents are still readable by others. The meaning of this element is undefined in this profile.


Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.

Short✕ This element is not supportedUnique id for inter-element referencing
Control0..1
Typestring
Is Modifierfalse
XML FormatIn the XML format, this property is represented as an attribute.
Summaryfalse
4. Quantity.extension
Definition

Implementers should not set or read this element. This element is only kept as optional to allow submission of documents that would contain a value, since those documents are still readable by others. The meaning of this element is undefined in this profile.


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✕ This element is not supportedAdditional 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.

Control0..*
TypeExtension
Is Modifierfalse
Summaryfalse
Alternate Namesextensions, user content
Invariantsele-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())
SlicingThis element introduces a set of slices on Quantity.extension. The slices are unordered and Open, and can be differentiated using the following discriminators:
  • value @ url
6. Quantity.value
Definition

The value of the measured amount. The value includes an implicit precision in the presentation of the value.

ShortNumerical value (with implicit precision)
Comments

The implicit precision in the value should always be honored. Monetary values have their own rules for handling precision (refer to standard accounting text books).

Control10..1
Typedecimal
Is Modifierfalse
Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
Summarytrue
Requirements

Precision is handled implicitly in almost all cases of measurement.

Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
amount-quantity-int-or-simple-decimal: An amount quantity should be either an integer, or a decimal that ends with '.25', '.5', or '.75' for non-scientific units (like tablets, pillules, ampules, etc.) ($this.toString().contains('.').not() or $this.toString().endsWith('.25') or $this.toString().endsWith('.5') or $this.toString().endsWith('.75'))
8. Quantity.comparator
Definition

Not allowed to be used in this context


How the value should be understood and represented - whether the actual value is greater or less than the stated value due to measurement issues; e.g. if the comparator is "<" , then the real value is < stated value.

Short< | <= | >= | > - how to understand the value
Comments

All modifiers SHALL be documented in the profile, in order to be usable.

Control0..01
BindingThe codes SHALL be taken from QuantityComparatorhttp://hl7.org/fhir/ValueSet/quantity-comparator|4.0.1
(required to http://hl7.org/fhir/ValueSet/quantity-comparator|4.0.1
Typecode
Is Modifiertrue because This is labeled as "Is Modifier" because the comparator modifies the interpretation of the value significantly. If there is no comparator, then there is no modification of the value
Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
Summarytrue
Requirements

Need a framework for handling measures where the value is <5ug/L or >400mg/L due to the limitations of measuring methodology.

Meaning if MissingIf there is no comparator, then there is no modification of the value
Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
10. Quantity.unit
Definition

A human-readable form of the unit.

ShortUnit representation
Control10..1
Typestring
Is Modifierfalse
Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
Summarytrue
Requirements

There are many representations for units of measure and in many contexts, particular representations are fixed and required. I.e. mcg for micrograms.

Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
12. Quantity.system
Definition

The identification of the system that provides the coded form of the unit.

ShortSystem of the code from Units of PresentationSystem that defines coded unit form
Control10..1
This element is affected by the following invariants: qty-3
Typeuri
Is Modifierfalse
Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
Summarytrue
Requirements

Need to know the system that defines the coded form of the unit.

Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
14. Quantity.code
Definition

Units of Presentation


A computer processable form of the unit in some unit representation system.

ShortCoded form of the unit
Comments

The preferred system is UCUM, but SNOMED CT can also be used (for customary units) or ISO 4217 for currency. The context of use may additionally require a code from a particular system.

Control10..1
BindingThe codes SHALL be taken from For codes, see Amount Quantity Unit Codes
(required to http://fhir.ch/ig/ch-emed-epr/ValueSet/ch-emed-epr-amount-quantity-unit-code
Typecode
Is Modifierfalse
Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
Summarytrue
Requirements

Need a computable form of the unit that is fixed across all forms. UCUM provides this for quantities, but SNOMED CT provides many units of interest.

Invariantsele-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 found here

0. Quantity
Definition

The comparator is not used on a SimpleQuantity

ShortA fixed quantity (no comparator)
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.

Control0..*
This element is affected by the following invariants: ele-1
Is Modifierfalse
Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
qty-3: If a code for the unit is present, the system SHALL also be present (code.empty() or system.exists())
sqty-1: The comparator is not used on a SimpleQuantity (comparator.empty())
2. Quantity.id
Definition

Implementers should not set or read this element. This element is only kept as optional to allow submission of documents that would contain a value, since those documents are still readable by others. The meaning of this element is undefined in this profile.

Short✕ This element is not supported
Control0..1
Typestring
Is Modifierfalse
XML FormatIn the XML format, this property is represented as an attribute.
Summaryfalse
4. Quantity.extension
Definition

Implementers should not set or read this element. This element is only kept as optional to allow submission of documents that would contain a value, since those documents are still readable by others. The meaning of this element is undefined in this profile.

Short✕ This element is not supported
Control0..*
TypeExtension
Is Modifierfalse
Summaryfalse
Invariantsele-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())
SlicingThis element introduces a set of slices on Quantity.extension. The slices are unordered and Open, and can be differentiated using the following discriminators:
  • value @ url
6. Quantity.value
Definition

The value of the measured amount. The value includes an implicit precision in the presentation of the value.

ShortNumerical value (with implicit precision)
Comments

The implicit precision in the value should always be honored. Monetary values have their own rules for handling precision (refer to standard accounting text books).

Control1..1
Typedecimal
Is Modifierfalse
Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
Summarytrue
Requirements

Precision is handled implicitly in almost all cases of measurement.

Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
amount-quantity-int-or-simple-decimal: An amount quantity should be either an integer, or a decimal that ends with '.25', '.5', or '.75' for non-scientific units (like tablets, pillules, ampules, etc.) ($this.toString().contains('.').not() or $this.toString().endsWith('.25') or $this.toString().endsWith('.5') or $this.toString().endsWith('.75'))
8. Quantity.comparator
Definition

Not allowed to be used in this context

Short< | <= | >= | > - how to understand the value
Comments

All modifiers SHALL be documented in the profile, in order to be usable.

Control0..0
BindingThe codes SHALL be taken from QuantityComparator
(required to http://hl7.org/fhir/ValueSet/quantity-comparator|4.0.1
Typecode
Is Modifiertrue because This is labeled as "Is Modifier" because the comparator modifies the interpretation of the value significantly. If there is no comparator, then there is no modification of the value
Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
Summarytrue
Requirements

Need a framework for handling measures where the value is <5ug/L or >400mg/L due to the limitations of measuring methodology.

Meaning if MissingIf there is no comparator, then there is no modification of the value
Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
10. Quantity.unit
Definition

A human-readable form of the unit.

ShortUnit representation
Control1..1
Typestring
Is Modifierfalse
Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
Summarytrue
Requirements

There are many representations for units of measure and in many contexts, particular representations are fixed and required. I.e. mcg for micrograms.

Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
12. Quantity.system
Definition

The identification of the system that provides the coded form of the unit.

ShortSystem of the code from Units of Presentation
Control1..1
This element is affected by the following invariants: qty-3
Typeuri
Is Modifierfalse
Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
Summarytrue
Requirements

Need to know the system that defines the coded form of the unit.

Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
14. Quantity.code
Definition

Units of Presentation

ShortCoded form of the unit
Comments

The preferred system is UCUM, but SNOMED CT can also be used (for customary units) or ISO 4217 for currency. The context of use may additionally require a code from a particular system.

Control1..1
BindingThe codes SHALL be taken from Amount Quantity Unit Codes
(required to http://fhir.ch/ig/ch-emed-epr/ValueSet/ch-emed-epr-amount-quantity-unit-code
Typecode
Is Modifierfalse
Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
Summarytrue
Requirements

Need a computable form of the unit that is fixed across all forms. UCUM provides this for quantities, but SNOMED CT provides many units of interest.

Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))