Your doctor may recommend duplex ultrasound to check blood flow in your veins and to look for blood clots. Duplex ultrasound combines traditional with Doppler ultrasound. Traditional ultrasound uses sound waves to create a picture of the structures in your body, in this case the blood vessels and anything that may be blocking the flow of blood. Doppler ultrasound uses sound waves to create pictures of the flow or movement of the blood through the veins. The two types of ultrasound together paint a picture that helps your doctor diagnose your condition.

During this test, a handheld device will be placed on your body and passed back and forth over the affected area. The device sends and receives sound waves. A computer will convert the sound waves into a picture of the blood flow in your arteries and veins.

The results of this test can show whether a blood vessel is blocked. The results also can help show the severity of Peripheral Artery Disease (P.A.D.).

Source: National Heart, Lung, and Blood Institute; National Institutes of Health; U.S. Department of Health and Human Services.