Tourette Syndrome

Diagnosis

Tics are sometimes difficult to diagnose as they can come and go and may be suppressed during examinations. There is no laboratory test for tic disorders or Tourette syndrome. Diagnosis is based on the presence of both movement and vocal tics for at least a year.

If a tic lasts less than six months it may be referred to as a transient tic disorder. If it lasts longer than six months and is only a motor tic, it may be called a chronic tic disorder.