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Carotid duplex

Carotid duplex


Scan - carotid duplex; Carotid ultrasound; Carotid artery ultrasound; Ultrasound - carotid; Vascular ultrasound - carotid; Ultrasound - vascular - carotid

Carotid duplex is an ultrasound test that shows how well blood is flowing through the carotid arteries. The carotid arteries are located in the neck. They supply blood directly to the brain.

I Would Like to Learn About:

  • How the Test is Performed

    Ultrasound is a painless method that uses sound waves to create images of the inside of the body. The test is done in a vascular lab or radiology department.

    The test is done in the following way:

    • You lie on your back. Your head is supported to keep it from moving. The ultrasound technician applies a water-based gel to your neck to help with the transmission of the sound waves.
    • Next, the technician moves a wand called a transducer back and forth over the area.
    • The device sends sound waves to the arteries in your neck. The sound waves bounce off the blood vessels and form images or pictures of the insides of the arteries.
  • How to Prepare for the Test

    No preparation is necessary.

  • How the Test will Feel

    You may feel some pressure as the transducer is moved around your neck. The pressure should not cause any pain. You may also hear a "whooshing" sound. This is normal.

  • Why the Test is Performed

    This test checks blood flow in the carotid arteries. It can detect:

    • Blood clotting (thrombosis)
    • Narrowing in the arteries (stenosis)
    • Other causes of blockage in the carotid arteries

    Your doctor may order this test if:

    • You have had a stroke or transient ischemic attack (TIA)
    • You need a follow-up test because your carotid artery was found to be narrowed in the past or you have had surgery on the  artery
    • Your doctor hears an abnormal sound called a bruit over the carotid neck arteries. This may mean the artery is narrowed.
  • Normal Results

    The results will tell your doctor how open or narrowed your carotid arteries are. For example, the arteries may be 10% narrowed, 50% narrowed, or 75% narrowed.

    A normal result means there is no problem with the blood flow in the carotid arteries. The artery is free of any significant blockage, narrowing, or other problem.

  • What Abnormal Results Mean

    An abnormal result means the artery may be narrowed, or something is changing the blood flow in the carotid arteries. This is a sign of atherosclerosis or other blood vessel conditions.

    In general, the more narrowed the artery is, the higher your risk of stroke.

    Depending on the results, your doctor may want you to:

    • Consider surgery
    • Have additional tests (such as cerebral angiography, CT angiography, and magnetic resonance angiography)
    • Follow a healthy diet and lifestyle to prevent hardening of the arteries
    • Repeat the test again in the future
  • Risks

    There are no risks with having this procedure.

Related Information

  UltrasoundBlood clotsHardening of the a...   Carotid artery sur...  


Review Date: 6/2/2014  

Reviewed By: Norman S. Kato, MD, Surgeon with the Cardiac Care Medical Group, Encino, CA. Review provided by VeriMed Healthcare Network. Also reviewed by David Zieve, MD, MHA, Isla Ogilvie, PhD, and the A.D.A.M. Editorial team.

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