Hi all, Sorry if this is more of a FHIR issue than a Medplum one, but since we are using Medplum as a base for our project I figured I'd give it a shot and ask here if someone has faced something similar. We're trying to find a way to relate an Encounter and a DiagnosticReport to a ResearchStudy. I have a few questions: - From the [FHIR documentation](https://build.fhir.org/researchstudy-definitions.html#ResearchStudy.result) it seems that the ResearchStudy itself could reference a list of DiagnosticReports as a "result", but I can't seem to find any reference to that in the [Medplum documentation](https://www.medplum.com/docs/api/fhir/resources/researchstudy?section=schema). Do you know if this is implemented? - We are even more interested to know if the other way around is possible - a DiagnosticReport referencing a ResearchStudy. I couldn't find any specific field for that in the docs, and I believe we'd have to use the "basedOn" field. But that doesn't allow a reference to a ResearchStudy directly. So we'd have to reference a CarePlan, which in turn references a PlanDefinition which is, then, referenced by the ResearchStudy. Do you know if there's any easier way to accomplish that? - Related to the question above, if there's no easier way: I can see how to reference the PlanDefinition from the CarePlan on the [FHIR docs (using instantiatesCanonical)](https://build.fhir.org/careplan-definitions.html#CarePlan.instantiatesCanonical), but I also couldn't find this relationship in the [Medplum docs](https://www.medplum.com/docs/api/fhir/resources/careplan?section=schema). Do you know if this is possible at all? Thank you all for your time and attention! -# Pinging @ya51n. so he can follow this as well

Medplum user and not a FHIR expert but it seems you're looking at the "CI build" (latest) of the FHIR documentation. Medplum as well as the large majority of implementations use [R4](https://hl7.org/fhir/R4/researchstudy.html). In this case, it appears the

result

key you mentioned isn't part of the R4 ResearchStudy.

Hey @nathan-watkins , thanks for taking the time to answer! That makes sense, and it might be the case for the "result" key, yes. Any idea for the other questions, though? (@rahul1 and @reshma , sorry, I'll tag you here just in case you have some input on this as well)

@nathan-watkins is correct. R4 is the rolled out version here in the US and is going to be in the near future as well

Extremely unqualified to say what the most correct way to accomplish that but at first glance there appears to be a way to traverse it through something like DiagnosticReport.encounter (DiagnosticReport -> Encounter) Encounter.subject:Patient (Encounter -> Patient) ResearchSubject.individual (ResearchSubject -> Patient) ResearchSubject.study (ResearchSubject -> ResearchStudy) A probably hacky option would be to leverage meta.tag in a way that can point to the ResearchStudy

Hi @de_pretto ! These are great questions. The root cause of the discrepancy you've encounted is that the "FHIR docs" you've linked are from th working draft of FHIR version R6 (https://build.fhir.org) Medplum currently supports FHIR R4 only, which is the industry standard

Hi @rahul1 ! Apologies for the delay in responding, I got the messages and forgot to reply. Just wanted to thank you and @nathan-watkins for the help and tips. Also, I just saw that the Medplum docs now include the "result" field for the ResearchStudy. Thank you for that as well!