I am assuming that you are trying to find out if someone has this disorder. Here is my information/advice:
Tourettes is not diagnosed by any instruments. There is not a test for Tourettes. Tourettes is diagnosed by oral history from you or the patient, and observation in the Doctors office. Sometimes, a physician will ask the person to undergo an EEG. This will not diagnose Tourettes, but is helpful in ruling out other conditions. Sometimes a blood test is required to help in ruling out other diseases.
Make an appointment with a Neurologist. You will most likely need a referral from your regular family physician.
Keep a log of the tics and vocal tremors. How often, etc. If possible, video tape the person when the tics are very obvious. This will help in the diagnosis if the tics are not present at the prescribed time and day of the appointment.
Bring the log and your video camera (to show the tape) to the Neurologist. This information is imperative.
Also, I would like to point out that you have incorrectly placed this question in the Mental Health category. Tourettes is not a Mental Illness. It is Neurological, or to be more specific, Neurobiological.
I hope this helps.
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