Please note: This guidance has been superseded by the Implementation guide for digitial medicines, which contains up-to-date information.
Element: subject
Note: It is acknowledged that a typical Hospital Patient Administration System (PAS) available today will not expose a FHIR interface so referencing by URL will most likely not be available for some time; however, this should be a target architecture so that the FHIR-enabled PAS can be used as a trusted source of Patient resources across multiple hospital systems.
See population of a Patient resource.