What are the Tourette syndrome (TS) Study Group diagnostic criteria for chronic multiple motor tic or phonic tic disorder (B-1 and B-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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Answer

Diagnostic criteria for chronic multiple motor tic or phonic tic disorder (B-1 and B-2) are as follows:

  • Either multiple motor or vocal tics, but not both, have been present at some time during the illness

  • 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, 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 chronic multiple motor tic or phonic tic disorder, B-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 a reliable examiner (for chronic multiple motor tic or phonic tic disorder by history, B-2)

Diagnostic criteria for chronic single tic disorder (C-1 and C-2): This disorder is the same as in the previous category (B-1 and B-2), but with a single motor or vocal tic.


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