Tourettes disorder and OCD have a similar symptoms and age of onset.1 Approximately 90% of those with Tourettes disorder have some compulsions, and up to 66% meet criteria
for OCD.1 Delirium, depersonalization disorder,
neuroleptic-induced parkinsonism, and malingering do not have significant symptom overlap with OCD.
REFERENCE 1. American Psychiatric Association. Diagnostic and statistcal manual of mental disorders. 4th ed., text rev. Washington (DC): The Association; 2000.