A Carotid ultrasound test uses high-pitched sound waves to evaluate carotid arteries (the arteries in your neck). The speed and direction of blood in your arteries can be seen on a video screen. Carotid ultrasound testing is done to look for blocked or narrowed carotid arteries as the cause of dizziness or stroke – or that indicate an increased risk of stroke.

No special preparation is needed for carotid ultrasound testing.