Additional Study Information: The Center for OCD and Related Disorders and the Institute of Genomic Medicine is conducting a study to look for genetic causes of OCD. Our goal is to look at the genes of individuals with OCD to see if we can identify what may have put those individuals at risk for OCD. Participants will receive a clinical evaluation at no cost, a blood draw (up to 2 tablespoons) and compensation for their time. Significant findings from these genetic tests will be reported back to participants (if they chose to be notified of results).