In OLIS, a test result or observation is uniquely identified within a test request by Observation Identifier, Observation Sub-ID, and Test Result Release Date/Time .
Use this field to distinguish between multiple rsults with the same observation ID associated with one obseravation, for example three occult blood test results reported under the same test result code, or an initial result accompanied by a supplemental result that does not replace the initial result.
Project FHIR API
This is the location where you can find your resource using a FHIR client.
Simplifier FHIR API
The global endpoint is where users can search for all resources in Simplifier. Resources have a globally unique guid Id here.