Other disorders are related to, but distinguished from, schizophrenia in terms of presenting symptoms and the duration or magnitude of impairment. The DSM-IV-TR (APA, 2000) categorizes these disorders as follows:
· Schizophreniform disorder: The client exhibits the symp-toms of schizophrenia but for less than the 6 months necessary to meet the diagnostic criteria for schizophre-nia. Social or occupational functioning may or may not be impaired.
· Delusional disorder: The client has one or more nonbi-zarre delusions—that is, the focus of the delusion is be-lievable. Psychosocial functioning is not markedly impaired, and behavior is not obviously odd or bizarre.
· Brief psychotic disorder: The client experiences the sud-den onset of at least one psychotic symptom, such as delusions, hallucinations, or disorganized speech or be-havior, which lasts from 1 day to 1 month. The episode may or may not have an identifiable stressor or may fol-low childbirth.
· Shared psychotic disorder (folie à deux): Two people share a similar delusion. The person with this diagnosis develops this delusion in the context of a close relation-ship with someone who has psychotic delusions.
Two other diagnoses, schizoid personality disorder and schizotypal personality disorder, are not psychotic disor-ders and should not be confused with schizophrenia even though the names sound similar.
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