A carotid ultrasound shows whether you have plaque buildup in your carotid arteries. Over time, plaque can harden or rupture (break open). This can reduce or block the flow of oxygen-rich blood to your brain and cause a stroke.
Your doctor may recommend a carotid ultrasound if you:
- Had a stroke or mini-stroke recently. During a mini-stroke, you may have some or all of the symptoms of a stroke. However, the symptoms usually go away on their own within 24 hours.
- Have an abnormal sound called a carotid bruit (broo-E) in one of your carotid arteries. Your doctor can hear a carotid bruit using a stethoscope. A bruit might suggest a partial blockage in your carotid artery, which could lead to a stroke.
Your doctor also may recommend a carotid ultrasound if he or she thinks you have:
- Blood clots in one of your carotid arteries
- A split between the layers of your carotid artery wall. The split can weaken the wall or reduce blood flow to your brain.
A carotid ultrasound also might be done to see whether carotid artery surgery, also called carotid endarterectomy (END-ar-ter-EK-to-me), has restored normal blood flow through a carotid artery.
If you had a procedure called carotid stenting, your doctor might use carotid ultrasound afterward to check the position of the stent in your carotid artery. (The stent, a small mesh tube, supports the inner artery wall.)
Carotid ultrasound sometimes is used as a preventive screening test in people at increased risk of stroke, such as those who have high blood pressure and diabetes.