A carotid ultrasound is a painless, radiation-free scan of the two main arteries in your neck that supply blood to the brain. It's most often ordered to evaluate stroke risk — either after symptoms have already occurred, or as part of a more detailed risk evaluation in select higher-risk patients — and it gives your doctor a direct look at your blood vessels rather than a calculated estimate alone.
What It Is
An ultrasound probe placed against the skin of your neck images the carotid arteries — no radiation, no needles, no contrast dye. It measures the thickness of the artery wall and looks directly for plaque buildup and narrowing (stenosis), the same basic approach as a cardiac echo, just aimed at a different set of vessels.
Why It's Ordered
- After a stroke or transient ischemic attack (TIA) — to check whether a narrowed carotid artery was the cause, and whether a procedure to open it could help prevent another one
- When a doctor hears an abnormal whooshing sound (a bruit) over the neck during a routine physical exam — a possible sign of turbulent blood flow through a narrowed artery
- As an additional data point in cardiovascular risk assessment in select patients, since visible carotid plaque often reflects the same atherosclerotic process affecting the coronary arteries (see Understanding Your Cardiovascular Risk)
- In some patients with peripheral artery disease, since atherosclerosis affecting one vascular territory raises the likelihood of it affecting others (see Peripheral Artery Disease)
Unlike a coronary calcium score, a carotid ultrasound isn't a routine screening test recommended for the general population — it's typically ordered for a specific reason rather than universally. (See Coronary CT Angiography & Calcium Scoring for that comparison.)
What to Expect
Takes about 20-30 minutes. You'll lie down while a technician moves the ultrasound probe along both sides of your neck, sometimes turning your head to get better views of each artery. No preparation is needed — no fasting, no medication changes — and you can drive yourself home afterward.
What the Results Mean
- Normal or minimal plaque — reassuring; general cardiovascular risk-factor management remains the focus
- Mild to moderate narrowing — usually managed with medications and risk-factor control (blood pressure, cholesterol, smoking cessation) rather than a procedure, with periodic re-checking
- Severe narrowing — may prompt a conversation about a procedure to open the artery (carotid stenting or carotid endarterectomy surgery), particularly if you've already had symptoms from it, such as a stroke or TIA
Common Questions
Is this the same as an echocardiogram?
No — an echo looks at the heart itself, while a carotid ultrasound looks at the two large arteries in the neck that supply blood to the brain; some patients get both as part of a broader cardiovascular evaluation, but they answer different questions.
Does everyone need this test?
No — it's not a routine screening test for most people; it's typically ordered for a specific reason, such as stroke symptoms, a bruit heard on exam, or as part of a more detailed risk evaluation in select higher-risk patients.
If my carotid arteries have plaque, does that mean my coronary arteries do too?
Not necessarily, but the same risk factors that cause plaque in one location often affect others — it's a reasonable prompt to discuss your overall cardiovascular risk with your care team, not a diagnosis of coronary disease by itself.
How often do I need this repeated?
Depends entirely on your initial findings and risk factors — your care team will recommend a specific interval, if any, rather than a one-size-fits-all schedule.