Generated Narrative: StructureDefinition emaDuration Name Flags Card. Type Description & Constraints Duration 0..* Duration A length of time extension 1..1 EmaCoding The Package Shelf Life Duration Extension URL: http://ema.europa.eu/fhir/extension/codedUnit value 1..1 decimal Numerical value (with implicit precision) unit 1..1 string Unit representation system 1..1 uri System that defines coded unit form Required Pattern: http://unitsofmeasure.org code 1..1 code Coded form of the unit Documentation for this format
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.
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.
code.exists() implies ((system = %ucum) and value.exists())
All FHIR elements must have a @value or children
hasValue() or (children().count() > id.count())
If a code for the unit is present, the system SHALL also be present
PQ, IVL<PQ>, MO, CO, depending on the values,PQ, IVL<PQ> depending on the values
Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.
Extensions are always sliced by (at least) url
The Package Shelf Life Duration Extension
Must have either extensions or value[x], not both
Numerical value (with implicit precision)
The value of the measured amount. The value includes an implicit precision in the presentation of the value.
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).
Precision is handled implicitly in almost all cases of measurement.
PQ.value, CO.value, MO.value, IVL.high or IVL.low depending on the value
< | <= | >= | > | ad - how to understand the value
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.
Need a framework for handling measures where the value is <5ug/L or >400mg/L due to the limitations of measuring methodology.
If there is no comparator, then there is no modification of the value
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
How the Quantity should be understood and represented.
There are many representations for units of measure and in many contexts, particular representations are fixed and required. I.e. mcg for micrograms.
The identification of the system that provides the coded form of the unit.
Need to know the system that defines the coded form of the unit.
CO.codeSystem, PQ.translation.codeSystem
A computer processable form of the unit in some unit representation system.
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.
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.
PQ.code, MO.currency, PQ.translation.code