What are the Tourette syndrome (TS) Study Group diagnostic criteria for Tourette syndrome (TS) (A-1 or A-2)?

Updated: May 30, 2019
  • Author: William C Robertson, Jr, MD; Chief Editor: Stephen L Nelson, Jr, MD, PhD, FAACPDM, FAAN, FAAP  more...
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Diagnostic criteria for TS (coded as A-1 or A-2 depending on source of information) are as follows:

  • Both multiple motor and one or more vocal tics have been present at some time during the illness, though not necessarily concurrently

  • The tics occur many times a day, nearly every day, or intermittently throughout a period of more than 1 year

  • The anatomic location, number, frequency, complexity, type, or severity of tics changes over time

  • Tics have their onset before age 21 years

  • Involuntary movements and noises cannot be explained by other medical conditions

  • Motor and/or vocal tics must be witnessed by a reliable examiner directly at some point in the illness or be recorded by videotape or cinematography (for definite TS, A-1) or (for tics not witnessed by a reliable examiner) tics must be witnessed by a reliable family member or close friend, and description of tics as demonstrated must be accepted by reliable examiner (for TS by history, A-2)

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