The data query and retrieval broker enables caregivers to search, potentially select and receive needed data across a trusted network. Once the patient identification and linking process has occurred, connected systems can request a list of available remote patient content using either XCA or FHIR queries. These actions are brokered by the CommonWell infrastructure to simplify the work required by participating systems. To the requesting HIT product, these transactions appear to be no different than a standard query against any remote HIT system, although the responses are being aggregated from many responding systems.
CommonWell uses the flows defined by XCA to distribute or fan out ITI-38 queries to all known remote systems where content for the patient is known to be available. Queries return aggregated metadata about all available clinical data to the requesting system where the requesting user can potentially select the data most valuable to them from a list, all within the familiar interface of the local HIT system.
When a user initiates a retrieval, files are escorted through the CommonWell network (but are not stored there), and their contents are only accessible by the receiving system.