Transcranial Doppler ultrasonography; TCD ultrasonography; TCD; Transcranial Doppler study
Transcranial doppler ultrasound (TCD) is a diagnostic test. It measures blood flow to and within the brain.
TCD uses sound waves to create images of the blood flow inside the brain.
This is how the test is performed:
No special preparation is needed for this test. You do not need to change into a medical gown.
The gel may feel cold on your skin. You may feel some pressure as the transducer is moved around your head and neck. The pressure should not cause any pain. You may also hear a "whooshing" sound. This is normal.
The test is done to detect conditions that affect blood flow to the brain:
A normal report shows normal blood flow to the brain. There is no narrowing or blockage in the blood vessels leading to and within the brain.
An abnormal result means an artery may be narrowed or something is changing the blood flow in the arteries of the brain.
There are no risks with having this procedure.
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Review Date: 4/29/2023
Reviewed By: Joseph V. Campellone, MD, Department of Neurology, Cooper Medical School of Rowan University, Camden, NJ. Review provided by VeriMed Healthcare Network. Also reviewed by David C. Dugdale, MD, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.
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