“Tourette Syndrome.” Mayo Clinic, Mayo Foundation for Medical Education and Research, 8 Aug. 2018, https://www.mayoclinic.org/diseases-conditions/tourette-syndrome/diagnosis-treatment/drc-20350470. 

University of Texas at Austin

There is no test that is currently being used to diagnose Tourette syndrome. However these criteria are often used to diagnose this disorder:
- Both motor and vocal tics are present ( do not have to be present at the same time)
- Tics are present several times in the day (almost every day or at irregular intervals) for more than 1 year
- Tics are present and begin before the age of 18
- Tics are not a cause of medications, substances, or medical conditions
- Tics change over time (location, frequency, type, complexity, severity) 

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