The Diagnostic resources are concerned with the process of observing, testing, and diagnosing a patient. Note that, once a diagnosis is confirmed, it is recorded as a Condition so it becomes part of the historical patient record.
The DiagnosticReport resource typically provides a set of textual information and interpretation after performing a diagnostic service, such as a Radiology report or Pathology report.
The Observation resource primarily records discrete values, answers, and results, such as clinical laboratory data and vital signs.
Select here to see the detailed categorization and full set of resources that fall into this category in the HL7® FHIR® Standard.