Observation.related 
A reference to another resource (usually another Observation) whose relationship is defined by the relationship type code.
= Must Support, = Is Modifier, = QiCore defined extension
| Field | Card. | Type | Description |
|---|---|---|---|
| target | 1..1 | Observation | QuestionnaireResponse | A reference to the observation or [QuestionnaireResponse](questionnaireresponse.html#) resource that is related to this observation. |