3.33.6 StructureDefinition: Shared Health Duration - Detailed Descriptions
Definitions for the dtprofile-duration Profile.
1. Quantity | |
Definition | 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. |
Control | 0..* |
Comments | Usage Note: Quantity profile is mimicking Duration profile. |
Max Length | 0 |
Invariants | Defined on this element 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 | unique id for the element within a resource (for internal references). |
Control | 0..1 |
Type | id |
Max Length | 0 |
3. Quantity.extension | |
Definition | May be used to represent additional information that is not part of the basic definition of the element. In order 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 is allowed to define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension. |
Control | 0..* |
Type | Extension |
Alternate Names | extensions, user content |
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. |
Max Length | 0 |
4. Quantity.value | |
Definition | The value of the measured amount. The value includes an implicit precision in the presentation of the value. |
Control | 1..1 |
Type | decimal |
Must Support | true |
Requirements | Precision is handled implicitly in almost all cases of measurement. |
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). |
Max Length | 0 |
5. Quantity.comparator | |
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. |
Control | 0..1 |
Binding | The codes SHALL be taken from QuantityComparator How the Quantity should be understood and represented. |
Type | code |
Is Modifier | true |
Requirements | Need a framework for handling measures where the value is <5ug/L or >400mg/L due to the limitations of measuring methodology. |
Comments | 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. |
Max Length | 0 |
Meaning if Missing | If there is no comparator, then there is no modification of the value |
6. Quantity.unit | |
Definition | A human-readable form of the unit. |
Control | 0..1 |
Type | string |
Requirements | There are many representations for units of measure and in many contexts, particular representations are fixed and required. I.e. mcg for micrograms. |
Max Length | 0 |
7. Quantity.system | |
Definition | The identification of the system that provides the coded form of the unit. |
Control | 1..1 This element is affected by the following invariants: qty-3 |
Type | uri |
Must Support | true |
Requirements | Need to know the system that defines the coded form of the unit. |
Max Length | 0 |
8. Quantity.code | |
Definition | A unit of time (units from UCUM). |
Control | 1..1 |
Type | code |
Must Support | true |
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. |
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. |
Max Length | 0 |