Which term represents the standardized nosology used to classify psychiatric disorders?

• A. DSM-5 diagnosis
• B. Past psychiatric history
• C. Mental status exam
• D. Collateral information

Answer: (A)

The main idea here is the standardized system used to label and classify psychiatric disorders. This is the DSM-5 diagnosis, which provides specific criteria for each disorder so a clinician can assign a formal diagnostic label when a patient’s symptoms meet those criteria. Using this standardized nosology helps ensure consistency across clinicians, guides treatment decisions, and facilitates clear communication and research.

The other terms refer to different parts of the clinical process: past psychiatric history summarizes previous diagnoses and treatments; the mental status exam evaluates current mental functioning; collateral information is input from others about the patient’s behavior and functioning. None of these alone represents the formal diagnostic label or the standardized criteria used to classify disorders, which is what the DSM-5 diagnosis provides.