Which clinical feature best distinguishes schizophrenia from brief psychotic disorder in a 28-year-old man presenting with delusions and disorganized speech?
A. Prominent negative symptoms
B. Acute onset following a stressor
C. Presence of auditory hallucinations
D. Duration of psychotic symptoms for at least 1 month
Explanation
Distinguishing Schizophrenia from Brief Psychotic Disorder
Duration Criterion: The Key Discriminator
Key Point
The primary diagnostic distinction between schizophrenia and brief psychotic disorder is the minimum duration of psychotic symptoms. Schizophrenia requires ≥1 month of active symptoms, while brief psychotic disorder lasts 1 day to 1 month.
Comparative Table
Table
Feature
Schizophrenia
Brief Psychotic Disorder
Duration of psychosis
≥1 month (often years)
1 day–1 month
Prodromal phase
Often present (weeks–months)
Usually absent
Stressor association
Not required
Often follows acute stressor
Hallucinations
Common (any modality)
Can occur
Delusions
Common
Can occur
Negative symptoms
Prominent, persistent
Minimal or absent
Functional decline
Marked, progressive
Variable
Prognosis
Chronic, relapsing
Good; full recovery typical
Why Duration Matters
High-YieldNEET PG
The 1-month threshold is the DSM-5 criterion that separates these two conditions. This is the single most reliable discriminator and is heavily tested in NEET PG.
Clinical Pearl
A patient with 3 weeks of delusions and hallucinations following a major life stressor is brief psychotic disorder. The same patient with 6 weeks of symptoms is schizophrenia. The addition of 1 week changes the diagnosis entirely.
Why Other Features Are Not Discriminators
Hallucinations (Option 0): Both conditions can present with auditory hallucinations; presence alone does not distinguish them.
Acute onset following stressor (Option 2): While brief psychotic disorder often follows a stressor, schizophrenia can also have acute presentation; stressor presence is not specific.
Negative symptoms (Option 3): Prominent, persistent negative symptoms (alogia, avolition, affective blunting) are more characteristic of schizophrenia, but their absence does not rule it out, and brief psychotic disorder typically lacks these.
DSM-5 Schizophrenia Spectrum and Other Psychotic Disorders
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