Site Map

Transcranial Doppler ultrasound

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.

Images

Endarterectomy
Cerebral aneurysm
Transient Ischemic attack (TIA)
Atherosclerosis of internal carotid artery

How the Test is Performed

TCD uses sound waves to create images of the blood flow inside the brain.

This is how the test is performed:

How to Prepare for the Test

No special preparation is needed for this test. You do not need to change into a medical gown.

Remember to:

How the Test will Feel

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.

Why the Test is Performed

The test is done to detect conditions that affect blood flow to the brain:

Normal Results

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.

What Abnormal Results Mean

An abnormal result means an artery may be narrowed or something is changing the blood flow in the arteries of the brain.

Risks

There are no risks with having this procedure.

References

Defresne A, Bonhomme V. Multimodal monitoring. In: Prabhakar H, ed. Essentials of Neuroanesthesia. Cambridge, MA: Elsevier Academic Press; 2017:chap 9.

Ellis JA, Yocum GT, Ornstein E, Joshi S. Cerebral and spinal cord blood flow. In: Cottrell JE, Patel P, eds. Cottrell and Patel's Neuroanesthesia. 6th ed. Philadelphia, PA: Elsevier; 2017:chap 2.

Matta B, Czosnyka M. Transcranial doppler ultrasonography in anesthesia and neurosurgery. In: Cotrell JE, Patel P, eds. Cottrell and Patel's Neuroanesthesia. 6th ed. Philadelphia, PA: Elsevier; 2017:chap 7.

Newell DW, Monteith SJ, Alexandrov AV. Diagnostic and therapeutic neurosonology. In: Winn HR, ed. Youmans and Winn Neurological Surgery. 8th ed. Philadelphia, PA: Elsevier; 2023:chap 410.

Sharma D, Prabhakar H. Transcranial Doppler ultrasonography. In: Prabhakar H, ed. Neuromonitoring Techniques. Cambridge, MA: Elsevier Academic Press; 2018:chap 5.

BACK TO TOP

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.

ADAM Quality Logo
Health Content Provider
06/01/2025

A.D.A.M., Inc. is accredited by URAC, for Health Content Provider (www.urac.org). URAC's accreditation program is an independent audit to verify that A.D.A.M. follows rigorous standards of quality and accountability. A.D.A.M. is among the first to achieve this important distinction for online health information and services. Learn more about A.D.A.M.'s editorial policy, editorial process and privacy policy. A.D.A.M. is also a founding member of Hi-Ethics. This site complied with the HONcode standard for trustworthy health information from 1995 to 2022, after which HON (Health On the Net, a not-for-profit organization that promoted transparent and reliable health information online) was discontinued.

The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. A licensed medical professional should be consulted for diagnosis and treatment of any and all medical conditions. Links to other sites are provided for information only -- they do not constitute endorsements of those other sites. © 1997- 2024 A.D.A.M., a business unit of Ebix, Inc. Any duplication or distribution of the information contained herein is strictly prohibited.

A.D.A.M. content is best viewed in IE9 or above, Firefox and Google Chrome browser.