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Transcranial Doppler (TCD)

​Transcranial Doppler (TCD) is a test that uses sound waves to study the blood flow in your brain. The sound waves bounce off blood cells, sending information to a computer for analysis. This test may help to determine possible causes of stroke.


How should I prepare for the test?

  • Do not wear contact lenses. If you have lenses implanted, inform your sonographer.
  • Avoid using makeup around the eyes as it may smudge during the test.

What will happen during the test?

The test is done by a sonographer and takes up to an hour.

  • This test is done while you are lying down.
  • A small amount of gel is squeezed onto an ultrasound probe before it is placed on the temples, on the base of the skull (at the back of the neck) and on your closed eyelids.
  • Avoid talking and moving your head during the test for accurate results.
  • Once completed, the gel is cleaned off.
  • A detailed report will be sent to your doctor within two weeks. Your doctor will discuss the findings with you at your next appointment.


Frequently Asked Questions

Is the test safe?

The test uses ultrasound waves and is not known to cause any pain, side-effects or complications. The sonographer will be with you throughout the process. If you feel unwell, tell the sonographer.

Can I undergo the test if I am feeling unwell?

No. If you are feeling unwell e.g. fever, cough, do not proceed with the test. Call to reschedule your appointment.

Have questions or concerns? Call:

Tel: 6330 6363

Office Hours:
8.00am – 5.30pm, Mon – Wed, Fri
8.00am – 5.00pm, Thurs
Closed on Sat, Sun, Public Holidays

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The information is correct as of July 2021 and subject to revisions without notice.