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General Extensions for use by FHIR Implementers

FHIR Infrastructure Work GroupMaturity Level: N/AStandards Status: Informative
A set of general extensions defined for the convenience of implementers that use FHIR resources


data-absent-reasonDataAbsentReason :

Provides a reason why the expected value or elements in the element that is extended are missing.

bodySiteBodyStructureReference :

Record details about the anatomical location of a specimen or body part. This resource may be used when a coded concept does not provide the necessary detail needed for the use case.

rendered-valueRenderedValue :

Provides a rendered version of the value intended for human display. For example, a sensitive identifier (e.g. social security number) partially obscured by asterisks; a drivers licence number with dashes inserted; a date formatted as MMM dd, yyyy; etc.

geolocationGeolocation :

The absolute geographic location of the Location, expressed using the WGS84 datum (This is the same co-ordinate system used in KML).

translationTranslation :

Language translation from base language of resource to another language.

timezoneTimezoneCode :

An IANA timezone code for the timezone offset per BCP 175. The offset is specified as part of a dateTime/instant (or using the tzOffset extension on a date if necessary). The timezone code may also be provided to allow for human display of the location associated with the offset.

tz-offsetTimezoneOffset :

Timezone offset, for dates where timezone is not allowed as part of the base date.

relative-dateRelativeDateCriteria :

Specifies that a date is relative to some event. The event happens [Duration] after [Event].

languageHumanLanguage :

The Human Language of the item.

originalTextOriginalText :

A human language representation of the concept (resource/element) as seen/selected/uttered by the user who entered the data and/or which represents the full intended meaning of the user. This can be provided either directly as text, or as a url that is a reference to a portion of the narrative of a resource (DomainResource.text or Composition.section.text). When it a url, the value should end with a #{id} where the id identifies a specific portion of the referenced content (via an XHTML id attribute).

narrativeLinkNarrativeLink :

A human language representation of the concept (resource/element), as a url that is a reference to a portion of the narrative of a resource (DomainResource.text or or Composition.section.text).

replacesreplaces :

This indicates a separate conformance resource instance that is superseded by the current instance.

displayDisplayName :

The title or other name to display when referencing a resource by canonical URL.

variableVariable :

Variable specifying a logic to generate a variable for use in subsequent logic. The name of the variable will be added to FHIRPath's context when processing descendants of the element that contains this extension as well as extensions within the same element.

itemWeightItemWeight :

A numeric value that allows the comparison (less than, greater than) or other numerical manipulation of a concept (e.g. Adding up components of a score). Scores are usually a whole number, but occasionally decimals are encountered in scores.

designNoteDesignNote :

Information captured by the author/maintainer of the questionnaire for development purposes, not intended to be seen by users.

largeValueLargeValue :

The value of an integer that exceeds the bounds of the base int type.

extension-quantity-translationQuantityTranslation :

An alternative representation of the same physical quantity expressed in a different unit from a different unit code system and possibly with a different value.

characteristicExpressionCharacteristicExpression :

An expression that defines the criteria for group membership. This extension can only be used on a Group resource with a membership of definitional. When this expression is used, the Group resource cannot have any characteristic elements; this mechanism is exclusive with characteristics. The result of the expression SHALL be boolean-valued. The expression SHALL be parameterized with a %context variable that represents the subject being tested for membership. If evaluation of the expression results in true, the subject is considered a member of the group.

referencesContainedReferencesContained :

This indicates that the element containing this extension has an expression that makes reference to the specified contained resource.