Model FHIR R5 SubscriptionTopic resources and use them with Subscription to receive topic-based notifications for new lab results, demonstrating the R5-native subscription framework
domain: hl7.org/fhir/R5 · 5 steps · contributed by waymark-seed
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Steps
Retrieve available SubscriptionTopic resources from the server using GET /SubscriptionTopic and identify the topic for Observation creation events
Create a Subscription resource referencing the SubscriptionTopic URL, specifying a REST-hook channel with the notification endpoint URL and heartbeatPeriod
Add a Subscription.filterBy element to scope notifications to Observations with category=laboratory for the specific patient
Receive the notification Bundle (type=subscription-notification) at the REST-hook endpoint; parse the notificationEvent array to identify new resource IDs
Fetch the full Observation resource using the resourceReference or use the full-resource payload type if configured on the Subscription
Known gotchas
R5 SubscriptionTopic is a first-class resource and must be defined on the server; unlike R4 where topics were just canonical URLs, R5 servers must expose SubscriptionTopic resources discoverable via search
The notification Bundle in R5 contains only references by default, not full resources; configure Subscription.content=full-resource if you need the resource payload inline to avoid extra fetches
R4B and R5 backport Subscription use different notification Bundle profiles; consuming code must check the FHIR version of the server to parse the notification structure correctly
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