Carotid ultrasound
Informed by recognized medical guidance
Overview
A carotid ultrasound is a painless test that uses sound waves to create pictures of the carotid arteries – the large blood vessels on each side of your neck that carry blood to your brain. It checks for narrowing or blockages that can increase your risk of stroke.
Key facts
- Carotid ultrasound is also called carotid duplex ultrasound.
- It is a non-invasive test – no needles or radiation involved.
- The test takes about 30 to 45 minutes and is done in a hospital or clinic radiology department.
- It is often used to find plaque buildup (fatty deposits) in the carotid arteries.
Carotid ultrasound is a common and routine test, especially for people over 50 or those with risk factors like high blood pressure or diabetes.
The test is typically done on adults who have symptoms of a mini-stroke (transient ischemic attack) or who have a high risk of stroke due to conditions such as high blood pressure, high cholesterol, diabetes, or a history of smoking.
Symptoms
- Sudden numbness or weakness of the face, arm, or leg, especially on one side of the body
- Sudden confusion, trouble speaking, or understanding speech
- Sudden trouble seeing in one or both eyes
- Sudden trouble walking, dizziness, loss of balance or coordination
- Sudden severe headache with no known cause
- ⚠Brief episodes of weakness, numbness, or vision loss that go away quickly (these could be mini-strokes)
- ⚠Unexplained falls or fainting spells
Common symptoms
- Sudden weakness or numbness on one side of the face or body
- Sudden difficulty speaking or understanding speech
- Sudden vision loss in one eye
- Sudden dizziness or loss of balance
Symptoms in children
- Carotid ultrasound is rarely needed in children. If it is, it may be for conditions like neck masses or congenital (present at birth) blood vessel problems.
Symptoms in older adults
- The same symptoms as in adults, but older adults may also have more gradual symptoms like memory problems or confusion due to reduced blood flow to the brain.
Causes
Main causes
- A carotid ultrasound is used to find narrowing of the carotid arteries caused by atherosclerosis – a buildup of plaque (cholesterol, fat, calcium) inside the artery walls.
- Other causes for the test include checking for a carotid artery dissection (a tear in the artery wall) or monitoring a known carotid artery blockage.
Risk factors
- High blood pressure
- High cholesterol
- Diabetes
- Smoking
- Being overweight
- Lack of physical activity
- Family history of stroke or carotid artery disease
- Being over 50 years old
When to see a doctor
See a doctor urgently if:
- If you have any sudden symptoms of a stroke or mini-stroke, call your local emergency number immediately.
Book a routine appointment if:
- If you have risk factors for stroke (like high blood pressure, high cholesterol, diabetes, or smoking) and have not been tested, talk to your doctor about whether a carotid ultrasound is right for you.
Diagnosis
Carotid ultrasound is itself a diagnostic test, but it is often ordered after a physical exam and medical history review. A doctor may listen to your neck with a stethoscope for a whooshing sound (called a bruit) that can indicate narrowed arteries.
Tests that may be done
- Carotid ultrasound (duplex ultrasound) – uses sound waves to create images of the carotid arteries and measure blood flow.
- Sometimes a CT angiogram or MR angiogram is done if the ultrasound results are unclear or if more detail is needed.
What to expect at your appointment
During the test, you will lie on your back on an exam table. A gel is applied to your neck, and the sonographer moves a small handheld device (transducer) over your skin. You may hear whooshing sounds as blood flow is measured. The test is painless and takes about 30 to 45 minutes. You can resume normal activities immediately after.
Treatment
Treatment after a carotid ultrasound depends on what the test shows. If there is significant narrowing, your doctor may recommend lifestyle changes, medications, or surgery to reduce your stroke risk.
Self-care at home
- Eat a heart-healthy diet low in saturated fat, trans fat, and sodium (salt).
- Exercise regularly – aim for at least 30 minutes of moderate activity most days.
- Maintain a healthy weight.
Medical treatments
Your doctor may prescribe medications to manage blood pressure, lower cholesterol, or prevent blood clots. These treatments help slow the buildup of plaque and reduce the risk of stroke. Always take all medications exactly as prescribed and do not stop without talking to your doctor.
When is surgery considered?
If the carotid artery is severely narrowed (usually more than 70%), your doctor may recommend a procedure called carotid endarterectomy to remove the plaque. Another option is carotid angioplasty and stenting, where a small tube with a balloon widens the artery and a mesh tube (stent) is placed to keep it open.
Living with this condition
If you have carotid artery disease, it is important to manage your risk factors every day. Take your medications as prescribed, monitor your blood pressure and cholesterol levels, and watch for new or worsening symptoms.
Lifestyle tips
- Quit smoking – it is one of the most important things you can do for your artery health.
- Limit alcohol to no more than one drink per day for women and two for men.
- Manage stress through relaxation techniques like deep breathing or meditation.
Diet and exercise
Adopt a diet rich in fruits, vegetables, whole grains, lean proteins (like fish and poultry), and healthy fats (like olive oil and nuts). Limit processed foods, sugary drinks, and red meat. Get regular exercise – walking, swimming, or cycling – after checking with your doctor.
Mental health and emotional wellbeing
Living with the knowledge that you have narrowed arteries can cause anxiety or fear about having a stroke. It is normal to feel worried. Talk to your doctor or a counselor about these feelings. Support groups may also help.
Prevention
You can reduce your risk of carotid artery disease by managing your blood pressure, eating a healthy diet, staying active, not smoking, and limiting alcohol. These steps also help prevent plaque buildup from worsening.
Screening programmes
Carotid ultrasound screening is not recommended for everyone. However, your doctor may suggest it if you have certain risk factors, such as a family history of stroke or known vascular disease.
Complications
If left untreated
- Stroke – when a blood clot blocks an already narrow carotid artery or when a piece of plaque breaks off and travels to the brain.
- Transient ischemic attack (TIA or mini-stroke) – temporary symptoms that warn of a future stroke.
Long-term outlook
With early detection and proper management, many people with carotid artery disease can reduce their stroke risk significantly. Treatment and lifestyle changes work together to keep your arteries as healthy as possible.
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Always verify with your doctor
Health guidelines vary by country and region. The information in this article is based on international clinical guidelines but may not reflect the specific guidelines, medications, or practices in your country. Always discuss your health concerns with your own doctor or healthcare provider, and refer to your local national health guidelines where available.
Important notice This information is for educational purposes only. It does not replace professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider about your specific situation. If you are experiencing a medical emergency, call your local emergency services immediately.
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Sources and guidance
This article is educational and is prepared with reference to recognized health information and clinical guidance sources where available. Specific source links may vary by topic.
Last updated: July 16, 2026
Educational note: This information is for education only and is not a diagnosis.
Use it to support, not replace, advice from a licensed clinician.
If symptoms are severe, worsening, or urgent, call your local emergency number or seek emergency care.
Guidance may differ by country or region. Confirm local recommendations with a qualified healthcare provider.