A carotid artery Doppler exam is a painless, non-invasive ultrasound test to check blood flow in the carotid arteries.
The carotid arteries are two major blood vessels in the neck. They supply oxygen-rich blood from the heart to the brain, head, and face.
A carotid ultrasound uses sound waves to evaluate blood flow through the carotid arteries. This test also evaluates the thickness of the arteries and checks for blood clots.
Learn more about carotid artery Doppler exam, including its definition, indications, the procedure itself and post-procedure care.
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What is a carotid artery Doppler exam?
A carotid artery Doppler exam, also known simply as a carotid Doppler or carotid ultrasound, is a non-invasive imaging test that uses high-frequency sound waves to create images and assess the flow of blood through the carotid arteries. This exam helps detect any narrowing (stenosis) or blockages that could lead to serious conditions such as strokes.
Who needs a carotid Doppler?
A carotid ultrasound checks for blood clots or plaque. A blood clot or plaque buildup in the carotid arteries can block blood flow to the head and neck, including the brain. This can lead to serious complications, including stroke.
Learn more about blood clots>>
Reasons for a carotid Doppler may include:
Risk factors for stroke
- History of transient ischemic attack (TIA): Also known as mini-strokes, TIAs are a warning sign for a potential future stroke.
- History of stroke: Individuals who have previously had a stroke may be monitored with carotid Doppler exams.
- Cerebrovascular disease: Conditions affecting blood flow to the brain.
Symptoms suggesting carotid artery disease
- Transient Monocular Blindness (Amaurosis Fugax): Temporary vision loss in one eye.
- Unexplained dizziness or fainting: Persistent symptoms that could indicate reduced cerebral blood flow.
- Transient ischemic symptoms: Temporary neurological symptoms such as weakness, numbness, or difficulty speaking.
Monitoring of known carotid artery disease
- Carotid bruit: When a physician hears an abnormal sound (bruit) using a stethoscope over the carotid artery, indicating turbulent blood flow.
- Post-surgical follow-up: Monitoring after procedures like carotid endarterectomy or carotid artery stenting.
- Cardiac conditions: Patients with a history of coronary artery disease or peripheral artery disease may also be evaluated for carotid artery disease.
Carotid artery Doppler exam procedure
Preparation
Before having a carotid ultrasound, you will have a discussion with your health care provider about the reasons for the test and what to expect.
There’s typically no special preparation needed for a carotid Doppler, but be sure to follow any instructions from your health care provider.
What to expect
The carotid ultrasound is performed in a vascular lab. The test involves no needles, catheters, or dye. Ultrasound is used to the listen to the flow of blood through the carotid arteries in your neck.
You will be asked to lie down on your back on an exam table with your head tilted slightly back and to the side.
A gel will be applied to your neck. The gel may feel warm, but it is painless. This gel helps the sound waves from your arteries show up on the test.
The health care provider will press a device called a transducer against the gel on your neck. This transducer will transmit sound waves that create images on a computer screen to assess blood flow. Doppler technology measures the speed and direction of blood flow. This creates a whooshing sound you will hear during the test.
The exam typically takes about 15-30 minutes, but may take up to an hour depending on the situation.
Post-procedure care
- Cleaning: The gel is cleaned off the patient’s neck.
- Immediate results: Preliminary findings may be discussed immediately, but the final report is usually reviewed by a radiologist or vascular specialist.
- Follow-up: Patients may be advised on further testing or treatment based on the results.
A carotid artery Doppler exam is a valuable, non-invasive diagnostic tool used to assess blood flow in the carotid arteries and detect potential blockages or narrowing. If you or a loved one are experiencing symptoms or have risk factors for carotid artery disease, consulting with a health care provider will help determine the need for a carotid Doppler exam and develop an appropriate plan for monitoring or treatment based on the results.
