Carotid duplex

Definition

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.

Alternative Names

Scan - carotid duplex; Carotid ultrasound

Why the test is performed

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.

How the test is performed

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 onyour 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

No preparation is necessary.

How the test will feel

The test is noninvasive and painless.

What the risks are

There are no specific risks related to having this procedure.

Normal Values

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

What abnormal results mean

Disturbances inthe blood flow indicate atherosclerosis or other conditions.

Carotid stenosis, X-ray of the left artery
Carotid stenosis, X-ray of the left artery
Carotid stenosis, X-ray of the right artery
Carotid stenosis, X-ray of the right artery
Carotid duplex
Carotid duplex
Review Date: 8/22/2006
Reviewed 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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