Schizophreniform Disorder

A. Criteria A, D, and E of Schizophrenia are met. 

B. An episode of the disorder (including prodromal, active, and residual phases) lasts at least 1 month but less than 6 months. (When the diagnosis must be made without waiting for recovery, it should be qualified as "Provisional.") 
Specify if: 
Without Good Prognostic Features 
With Good Prognostic Features: as evidenced by two (or more) of the following: 

(1) onset of prominent psychotic symptoms within 4 weeks of the first noticeable change in usual behavior or functioning 
(2) confusion or perplexity at the height of the psychotic episode 
(3) good premorbid social and occupational functioning 
(4) absence of blunted or flat affect

Reprinted with permission from the Diagnostic and Statistical Manual of Mental Disorders, Fourth Edition, Text Revision. Copyright 2000 American Psychiatric Association