Browse e-KNOWBASE

Question: Diagnosis

Answer: There is no single test, like a blood test, to diagnose TS. Health professionals look at the person’s symptoms to diagnose TS and other tic disorders. The tic disorders differ from each other in terms of the type of tic present (motor or vocal, or combination of the both), and how long the symptoms have lasted. TS can be diagnosed if a person has both motor and vocal tics, and has had tic symptoms for at least a year.

The tic disorders differ from each other in terms of the type of tic present (motor or vocal, or a combination of both), and how long the symptoms have lasted. People with TS have both motor and vocal tics, and have had tic symptoms for at least 1 year. People with persistent motor or vocal tic disorders have either motor or vocal tics, and have had tic symptoms for at least 1 year. People with provisional tic disorders can have motor or vocal tics, or both, but have had their symptoms less than 1 year.

Here are the criteria in shortened form. Please note that they are presented for your information only and should not be used for self-diagnosis. If you are concerned about any of the symptoms listed, you should consult a trained health care provider with experience in diagnosing and treating tic disorders.

Tourette Syndrome (TS)
To be diagnosed with TS, a person must:
* have two or more motor tics (for example, blinking or shrugging the shoulders) and at least one vocal tic (for example, humming, clearing the throat, or yelling out a word or phrase), although they might not always happen at the same time.
* have had tics for at least a year. The tics can occur many times a day (usually in bouts) nearly every day, or off and on.
* have tics that begin before age 18 years.
* have symptoms that are not due to taking medicine or other drugs or due to having another medical condition (for example, seizures, Huntington disease, or postviral encephalitis).

Persistent (Chronic) Motor or Vocal Tic Disorder
To be diagnosed with a persistent tic disorder, a person must:
* have one or more motor tics (for example, blinking or shrugging the shoulders) or vocal tics (for example, humming, clearing the throat, or yelling out a word or phrase), but not both.
* have tics that occur many times a day nearly every day or on and off throughout a period of more than a year.
* have tics that start before age 18 years.
* have symptoms that are not due to taking medicine or other drugs, or due to having a medical condition that can cause tics (for example, seizures, Huntington disease, or postviral encephalitis).
* not have been diagnosed with TS.

Provisional Tic Disorder
To be diagnosed with a provisional tic disorder, a person must:
* have one or more motor tics (for example, blinking or shrugging the shoulders) or vocal tics (for example, humming, clearing the throat, or yelling out a word or phrase).
* have been present for no longer than 12 months in a row.
* have tics that start before age 18 years.
* have symptoms that are not due to taking medicine or other drugs, or due to having a medical condition that can cause tics (for example, Huntington disease or postviral encephalitis).
* not have been diagnosed with TS or persistent motor or vocal tic disorder.

(Source: Centers for Disease Control and Prevention, 10 Dec 2020)

Source Link: https://www.cdc.gov/ncbddd/tourette/diagnosis.html