When the request transitioned to being actionable.

A code that identifies a particular diagnostic investigation, or panel of investigations, that have been requested.

Binding: LOINC Diagnostic Request Codes (Preferred)

Protocol or definition followed by this request.

Any other notes and comments made about the service request. (e.g. "patient hates needles").

The desired perfomer for doing the diagnostic testing.

An explanation or justification for why this diagnostic investigation is being requested. This is often for billing purposes. May relate to the resources referred to in supportingInformation.

Binding: value set (Preferred)

Key events in the history of the request.

Who/what is requesting diagnostics. The practitioner that holds legal responsibility for ordering the investigation.

Whether the request is a proposal, plan, an original order or a reflex order.

Binding: DiagnosticRequestStage (Extensible)

On whom or what the investigation is to be performed. This is usually a human patient, but diagnostic tests can also be requested on animals, groups of humans or animals, devices such as dialysis machines, or even locations (typically for environmental scans).