If all criteria for a schizophrenia-spectrum disorder are met but the duration is less than six months, what is the most appropriate diagnosis?

• A. Schizophrenia
• B. Schizophreniform disorder
• C. Brief psychotic disorder
• D. Delusional disorder

Answer: (B)

Understanding the timing is essential here. Schizophrenia-spectrum disorders share similar psychotic features, but how long those features persist changes the diagnosis. If someone has the full range of schizophrenia-like symptoms but they have lasted between one and six months, the most appropriate label is schizophreniform disorder. It captures a schizophrenia-spectrum illness with a shorter duration, specifically between one and six months.

If the symptoms resolve in less than one month, the diagnosis would be a brief psychotic disorder. If the symptoms continue beyond six months and still meet the criteria for a schizophrenia-spectrum disorder, the diagnosis would be schizophrenia. Delusional disorder, in contrast, is defined mainly by a persistent delusion lasting at least one month without the broader range of psychotic symptoms that characterizes schizophrenia-spectrum disorders.