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ValueSet
default
Base StructureDefinition for Age Type: A duration of time during which an organism (or a process) has existed.
Age
Path
Age
Id
Age
Cardinality
0 - *
Definition
A duration of time during which an organism (or a process) has existed.
Comment
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.
Binding
Strength
extensible
Description
Appropriate units for Age.
ValueSet
Constraint
age-1 [error]
There SHALL be a code if there is a value and it SHALL be an expression of time. If system is present, it SHALL be UCUM. If value is present, it SHALL be positive.
ele-1 [error]
All FHIR elements must have a @value or children
qty-3 [error]
If a code for the unit is present, the system SHALL also be present
Path
Age.value
Id
Age.value
Type
Cardinality
0 - 1
Definition
The value of the measured amount. The value includes an implicit precision in the presentation of the value.
Comment
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).
Requirements
Precision is handled implicitly in almost all cases of measurement.
Constraint
ele-1 [error]
All FHIR elements must have a @value or children
Path
Age.comparator
Id
Age.comparator
Type
Cardinality
0 - 1
Definition
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.
Comment
Requirements
Need a framework for handling measures where the value is <5ug/L or >400mg/L due to the limitations of measuring methodology.
Binding
Strength
required
Description
How the Quantity should be understood and represented.
ValueSet
Constraint
ele-1 [error]
All FHIR elements must have a @value or children
Path
Age.unit
Id
Age.unit
Type
Cardinality
0 - 1
Definition
A human-readable form of the unit.
Comment
Requirements
There are many representations for units of measure and in many contexts, particular representations are fixed and required. I.e. mcg for micrograms.
Constraint
ele-1 [error]
All FHIR elements must have a @value or children
Path
Age.system
Id
Age.system
Type
Cardinality
0 - 1
Definition
The identification of the system that provides the coded form of the unit.
Comment
Requirements
Need to know the system that defines the coded form of the unit.
Constraint
ele-1 [error]
All FHIR elements must have a @value or children
Condition
qty-3
Path
Age.code
Id
Age.code
Type
Cardinality
0 - 1
Definition
A computer processable form of the unit in some unit representation system.
Comment
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.
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.
Constraint
ele-1 [error]
All FHIR elements must have a @value or children