Please Consider adding an optional element or core extension that could hold the patients awareness of a certain result or condition. The available value set is https://terminology.hl7.org/2.1.0/ValueSet-v3-TargetAwareness.html from code system TargetAwareness (2.16.840.1.113883.5.137) listed here: https://terminology.hl7.org/1.0.0/CodeSystem-v3-CodeSystem.html. CDA has the ability to do this and I know of at least one vendor who uses it inside (referring to) a result.;
<subject>
<awarenessCode code="U" codeSystem="2.16.840.1.113883.5.137" codeSystemName="TargetAwareness" displayName="uninformed" />
<relatedSubject>
<code code="116154003" codeSystem="2.16.840.1.113883.6.96" codeSystemName="SNOMED CT" displayName="Patient (person)" />
</relatedSubject>
</subject>

I believe this would be appropriate for all Clinical and Diagnostic Resources.

Zulip Thread: https://chat.fhir.org/#narrow/stream/179202-terminology/topic/Target.20Awareness.20.28patient.20awareness.29