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</div><div><span>Carotid duplex</span></div></div>
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<article><div id="d-article"><div class="page-info"><div class="page-title"><a name="start" id="start">
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</a><h1 class="with-also" itemprop="name">Carotid duplex</h1>
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</noscript></div><div class="main"><div id="ency_summary"><p>Carotid duplex is an <a test="test" href="./003336.htm">ultrasound</a> 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.</p></div><section><div class="section"><div class="section-header"><div class="section-title"><h2>How the Test is Performed</h2></div><div class="section-button"><button type="submit" aria-controls="section-1" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-1"><p>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.</p><p>The test is done in the following way:</p><ul><li>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.</li><li>Next, the technician moves a wand called a transducer back and forth over the area.</li><li>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.</li></ul></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>How to Prepare for the Test</h2></div><div class="section-button"><button type="submit" aria-controls="section-2" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-2"><p>No preparation is necessary.</p></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>How the Test will Feel</h2></div><div class="section-button"><button type="submit" aria-controls="section-3" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-3"><p>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.</p></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>Why the Test is Performed</h2></div><div class="section-button"><button type="submit" aria-controls="section-4" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-4"><p>This test checks blood flow in the carotid arteries. It can detect:</p><ul><li>Blood clotting (thrombosis)</li><li>Narrowing in the arteries (stenosis)</li><li>Other causes of blockage in the carotid arteries</li></ul><p>Your health care provider may order this test if:</p><ul><li>You have had a <a test="test" href="./000726.htm">stroke</a> or <a test="test" href="./000730.htm">transient ischemic attack (TIA)</a></li><li>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</li><li>Your provider hears an abnormal sound called a bruit over the carotid neck arteries. This may mean the artery is narrowed.</li></ul></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>Normal Results</h2></div><div class="section-button"><button type="submit" aria-controls="section-5" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-5"><p>The results will tell your provider how open or narrowed your carotid arteries are. For example, the arteries may be 10% narrowed, 50% narrowed, or 75% narrowed.</p><p>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.</p></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>What Abnormal Results Mean</h2></div><div class="section-button"><button type="submit" aria-controls="section-6" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-6"><p>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.</p><p>In general, the more narrowed the artery is, the higher your risk for stroke.</p><p>Depending on the results, your provider may want you to:</p><ul><li>Consider treatment with medicines or <a test="test" href="./002951.htm">surgery</a></li><li>Have additional tests (such as <a test="test" href="./003799.htm">cerebral angiography</a>, <a test="test" href="./007677.htm">CT angiography</a>, and <a test="test" href="./007269.htm">magnetic resonance angiography</a>)</li><li>Follow a healthy diet and lifestyle to prevent <a test="test" href="./000171.htm">hardening of the arteries</a></li><li>Repeat the test again in the future</li></ul></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>Risks</h2></div><div class="section-button"><button type="submit" aria-controls="section-7" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-7"><p>There are no risks with having this procedure.</p></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>Alternative Names</h2></div><div class="section-button"><button type="submit" aria-controls="section-Alt" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-Alt"><p>Scan - carotid duplex; Carotid ultrasound; Carotid artery ultrasound; Ultrasound - carotid; Vascular ultrasound - carotid; Ultrasound - vascular - carotid; Stroke - carotid duplex; TIA - carotid duplex; Transient ischemic attack - carotid duplex</p></div></div></section><section><div class="section sec-mb"><div class="section-header"><div class="section-title"><h2>Patient Instructions</h2></div><div class="section-button"><button type="submit" aria-controls="section-carepnt" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div name="Patient Instructions" class="section-body" id="section-carepnt"><ul class="side-nav"><li><a href="../patientinstructions/000238.htm">Carotid artery surgery - discharge</a></li>
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</ul></div></div></section><section><div class="section sec-mb"><div class="section-header"><div class="section-title"><h2>Images</h2></div><div class="section-button"><button type="submit" aria-controls="section-tnails" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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<li><img src="//medlineplus.gov/ency/images/ency/tnails/18051t.jpg" alt="Carotid duplex" title="Carotid duplex" class="side-img"/><a href="../imagepages/18051.htm">Carotid duplex</a></li>
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<li><img src="//medlineplus.gov/ency/images/ency/tnails/24472t.jpg" alt="Carotid Duplex Ultrasound" title="Carotid Duplex Ultrasound" class="side-img"/><a href="../imagepages/19966.htm">Carotid duplex ultrasound</a></li>
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</ul></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>References</h2></div><div class="section-button"><button type="submit" aria-controls="section-Ref" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-Ref"><p>Adamczyx P, Liebeskind DS. Vascular imaging: computed tomographic angiography, magnetic resonance angiography, and ultrasound. In: Jankovic J, Mazziotta JC, Pomeroy SL, Newman NJ, eds.<em> Bradley and Daroff's Neurology in Clinical Practice</em>. 8th ed. Philadelphia, PA: Elsevier; 2022:chap 41.</p><p>Bluth EI, Johnson SI, Troxclair L. The extracranial cerebral vessels. In: Rumack CM, Levine D, eds. <em>Diagnostic Ultrasound</em>. 6th ed. Philadelphia, PA: Elsevier; 2024:chap 24.</p><p>Polak JF, Pellerito JS. Carotid sonography: protocol and technical considerations. In: Pellerito JS, Polak JF, eds. <em>Introduction to Vascular Ultrasonography</em>. 7th ed. Philadelphia, PA: Elsevier; 2020:chap 5.</p></div></div></section>
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