Carotid Duplex Ultrasound

Assessing blood flow through the arteries that carry blood to the brain

A duplex ultrasound combines a traditional ultrasound, which uses sound waves that bounce off blood vessels to create an image, and Doppler ultrasound, which records sound waves that bounce off moving objects, such as blood, to measure speed and flow.

Your doctor may recommend a carotid duplex ultrasound if they suspect carotid artery disease, in which the carotid arteries in your neck become narrow or blocked. Reduced blood flow through these arteries is a major risk factor for stroke. The test may be used to evaluate an unusual sound heard during a physical exam or as preoperative evaluation before surgery.

What to expect during a carotid duplex ultrasound

During the test, you will be asked to lie on a table and remain still. A technician will spread gel on your neck. The gel helps transmit the sound waves to the ultrasound wand, which the technician will move over the area. A computer will turn the sound waves into images, and the Doppler will create the “swishing” sound of your blood.

The exam typically takes 30 minutes and should be painless. Your doctor will review the results with you when they’re available.

Treatments