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ValueSet
default
Base StructureDefinition for Distance Type: A length - a value with a unit that is a physical distance.
Distance
Path
Distance
Id
Distance
Cardinality
0 - *
Definition
A length - a value with a unit that is a physical distance.
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 Distance.
ValueSet
Constraint
dis-1 [error]
There SHALL be a code if there is a value and it SHALL be an expression of length. If system is present, it SHALL be UCUM.
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
Distance.value
Id
Distance.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
Distance.comparator
Id
Distance.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
Distance.unit
Id
Distance.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
Distance.system
Id
Distance.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
Distance.code
Id
Distance.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