FHIR Resources are the data packages used to send or receive data from a repository. With STU-3, Standard for Trial Use, release 3 of FHIR, there are currently 92 resources defined. The organization wants enough resources to handle 80% of the healthcare workflows, but does not want so many that the standard would become too complex.
Resources are meant to capture a meaningful amount of data. For example, the following table provides examples of what would be, and would not be, a FHIR resource. Things like patient demographic data or allergies provide the perfect amount of data. For those familiar with HL7 V2 messaging, a resource would typically contain about the same amount of data as a segment in a HL7 V2 message.
The data housed within resources is broken out into four parts, in the following order: