STU 3 Candidate

This page is part of the FHIR Specification (v1.4.0: STU 3 Ballot 3). The current version which supercedes this version is 5.0.0. For a full list of available versions, see the Directory of published versions

Extension The length of time for radiation exposure - Detailed Descriptions

Detailed Descriptions for the elements in the extension.

Extension
Definition

The duration of exposure to radiation for this study.

Control0..1
TypeExtension
Extension.id
Definition

unique id for the element within a resource (for internal references).

Control0..1
Typeid
Extension.extension(extension)
Definition

An Extension

Control0..0
TypeExtension
Extension.url
Definition

Source of the definition for the extension code - a logical name or a URL.

Control1..1
Typeuri
Comments

The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition should be version specific. This will ideally be the URI for the Resource Profile defining the extension, with the code for the extension after a #.

Fixed Valuehttp://hl7.org/fhir/StructureDefinition/imagingstudy-radiationDuration
Extension.valueQuantity(Duration)
Definition

Value of extension - may be a resource or one of a constrained set of the data types (see Extensibility in the spec for list).

Control1..1
TypeQuantity(Duration)
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.

InvariantsDefined on this element
drt-1: 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. (xpath: (f:code or not(f:value)) and (not(exists(f:system)) or f:system/@value='http://unitsofmeasure.org'))
qty-3: If a code for the unit is present, the system SHALL also be present (xpath: not(exists(f:code)) or exists(f:system))