Diagnostic tests
Transcranial Doppler (TCD)
Transcranial Doppler is a painless ultrasound that measures blood flow in the brain’s major arteries.
What it is
Transcranial Doppler is a painless ultrasound that measures blood flow in the brain’s major arteries. It can help evaluate stroke risk and blood-flow conditions.
How to prepare
No special preparation is usually needed. Avoid heavy hair products.
What to expect
A gel and handheld probe are placed on the temples and other areas of the head while you lie down. It usually takes 30–60 minutes.
This information is educational and does not replace a medical evaluation.