Schizophrenia spectrum disorder diagnostic criteria and distinguishing features tested on USMLE Step 1.
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- What is the minimum total duration of continuous signs of disturbance (including prodromal and residual periods) required for a schizophrenia diagnosis?
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6 months- What is the minimum duration of active-phase (Criterion A) symptoms required for schizophrenia, unless successfully treated?
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1 month- How many Criterion A symptoms must be present for at least a month to diagnose schizophrenia?
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At least 2- Per DSM-5, at least one of the required Criterion A symptoms for schizophrenia must come from which three symptom types?
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Delusions, hallucinations, or disorganized speech- What are the five symptom domains that make up Criterion A for schizophrenia?
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Delusions, hallucinations, disorganized speech, grossly disorganized or catatonic behavior, and negative symptoms- DSM-5 removed DSM-IV's rule that only ____ Criterion A symptom was needed if it was a bizarre delusion or a Schneiderian-type hallucination.
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one- What is the symptom duration range that defines schizophreniform disorder?
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1 to 6 months- What is the symptom duration range that defines brief psychotic disorder?
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1 day to 1 month, with eventual full return to premorbid functioning- In schizoaffective disorder, what must occur concurrently with Criterion A (active-phase) symptoms at some point in the illness?
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A major mood episode (depressive or manic)- For schizoaffective disorder, delusions or hallucinations must be present for how long in the absence of a major mood episode, at some point during the illness?
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At least 2 weeks- For schizoaffective disorder, mood symptoms must be present for what proportion of the total duration of the illness?
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The majority of the active and residual periods- What is the minimum duration of delusions required to diagnose delusional disorder?
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At least 1 month- Aside from the impact of the delusion itself, how is a patient's overall functioning affected in delusional disorder?
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It is not markedly impaired- What are the subtypes of delusional disorder?
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Erotomanic, grandiose, jealous, persecutory, somatic, mixed, and unspecified- What defines the erotomanic subtype of delusional disorder?
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The belief that another person, often of higher status, is in love with the patient
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