New diagnostic criteria for schizophrenia
The diagnostic criteria for schizophrenia in DSM-5 include the presence of two or more of the following symptoms for a significant portion of time during a 1-month period: delusions, hallucinations, disorganized speech, grossly disorganized or catatonic behavior, or negative symptoms (flat affect, avolition, social withdrawal, decreased talking, neglect of personal hygiene, decreased emotional expression, etc.).
Additionally, level of functioning should be markedly below baseline for a significant portion of time since the onset of the disturbance, and continuous signs and symptoms should persist for at least 6 months (may include prodromal or residual periods).
Of note, the symptoms should not be due to substance use or another medical condition or be attributable to schizoaffective disorder or major mood disorders.
