DSM-5:
Presence of one (or more) of the following symptoms. At least one of these must be (1), (2), or (3) (A):
- delusions
- hallucinations
- disorganized speech (e.g., frequent derailment or incoherence)
- grossly disorganized or catatonic behavior
Note: Do not include a symptom if it is a culturally sanctioned response pattern.
Duration of an episode of the disturbance is at least 1 day but less than 1 month, with eventual full return to premorbid level of functioning (B).
The disturbance is not better explained by major depressive or bipolar disorder with psychotic features or another psychotic disorder such as schizophrenia or catatonia, and is not attributable to the physiological effects of a substance (e.g., a drug abuse, a medication) or another medical condition (C).