What is the minimum duration of disturbance for schizophrenia when prodromal and residual periods are included?

What is the minimum duration of disturbance for schizophrenia when prodromal and residual periods are included?

• A. 1 year
• B. 6 months
• C. 6 weeks
• D. 3 months

Answer: (B)

The duration criterion for schizophrenia allows prodromal and residual phases to count toward the total time. You need a disturbance lasting at least 6 months in total, and within that period there must be at least 1 month of active-phase symptoms (delusions, hallucinations, disorganized speech, etc.). Because prodromal and residual periods can be present before or after the active phase, they are included in the 6-month total. So the minimum duration, including those phases, is six months. This distinguishes schizophrenia from shorter-duration conditions like brief psychotic disorder (less than 1 month) and from schizophreniform disorder (1–6 months total).

The duration criterion for schizophrenia allows prodromal and residual phases to count toward the total time. You need a disturbance lasting at least 6 months in total, and within that period there must be at least 1 month of active-phase symptoms (delusions, hallucinations, disorganized speech, etc.). Because prodromal and residual periods can be present before or after the active phase, they are included in the 6-month total. So the minimum duration, including those phases, is six months. This distinguishes schizophrenia from shorter-duration conditions like brief psychotic disorder (less than 1 month) and from schizophreniform disorder (1–6 months total).