| # | | Name | Source | Ver | Description |
| 1 | | adheres to | hl7.fhir.uv.extensions.r4#1.0.0 | R4 | The action represented by this resource has been determined to satisfy the expectations established by the referenced Definition resource. |
| 2 | | Communication Media | hl7.fhir.uv.extensions.r4#1.0.0 | R4 | It contains enriched media representation of the alert message, such as a voice recording. This may be used, for example for compliance with jurisdictional accessibility requirements, literacy issues, or translations of the unstructured text content in other languages. |
| 3 | | Episode of care | hl7.fhir.uv.extensions.r4#1.0.0 | R4 | Identifies the episode(s) of care that this resource is relevant to. Establishes the EpisodeOfCare as a 'grouper' of resources that are relevant to that episode. |
| 4 | | Release date | hl7.fhir.uv.extensions.r4#1.0.0 | R4 | Indicates the date on which request or event resource that has a status of 'on-hold' or 'suspended' should be moved back to an active state. |
| 5 | | Triggered by | hl7.fhir.uv.extensions.r4#1.0.0 | R4 | This resource came into being as a result of expectations set in the referenced Definition resource. I.e. This resource represents a 'step' dictated within the protocol/order set/etc. |