MedlinePlus Medical Encyclopedia: Carotid duplex

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Carotid duplex

Contents of this page:
Illustrations Alternative Names Definition How the Test is Performed How to Prepare for the Test	How the Test Will Feel Why the Test is Performed Normal Results What Abnormal Results Mean Risks

Illustrations

Carotid stenosis, X-ray of the left artery

Carotid stenosis, X-ray of the right artery

Carotid duplex

Alternative Names Return to top

Scan - carotid duplex; Carotid ultrasound

Definition Return to top

Carotid duplex is a procedure that uses ultrasound to look for plaques, blood clots, or other blood flow problems in the carotid arteries. The carotid arteries, located in the neck, supply blood to the brain.

How the Test is Performed Return to top

The test is done in the peripheral vascular lab or radiology department of a hospital. You are placed on your back and your head will be supported to prevent movement.

A water-soluble gel is placed on your skin. A handheld device called a transducer is placed on the area. The transducer directs high-frequency sound waves to the arteries being tested, while the gel helps transmit the sound. The ultrasound is turned on and images of the carotid arteries and pulse wave forms are obtained.

How to Prepare for the Test Return to top

No preparation is necessary.

How the Test Will Feel Return to top

The test is noninvasive and painless.

Why the Test is Performed Return to top

The test checks blood flow in the carotid arteries. It can detect narrowing in the arteries (stenosis), clotting (thrombosis), and other causes of blockage in the carotid arteries.

Normal Results Return to top

If the results are normal, there is no turbulence or disruption in the blood flow. The artery is free of any blockage, narrowing, or other problems.

What Abnormal Results Mean Return to top

Disturbances in the blood flow indicate atherosclerosis or other conditions.

Risks Return to top

There are no specific risks related to having this procedure.

Update Date: 8/22/2006

Updated by: Jonathan Gross, M.D., Department of Radiology, Columbia University Medical Center, New York, NY. Review provided by VeriMed Healthcare Network.

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