A Diagnostic report holds findings and interpretations of diagnostic tests performed on patients.
The diagnostic report by itself does not hold any relevant clinical information, all clinical information are stored as Observations, references to observations created through a diagnostic report is maintained in both Diagnostic report and Observations.
To start with Diagnostic reports can only be created from Service Requests, But in theory, a diagnostic report could be created based off of any resource
The spec for Diagnostic Report is as follows