Definition of Doppler ultrasound exam of an arm or leg:

This test uses ultrasound to examine the blood flow in the major arteries and veins in the arms and legs.

How the test is performed:

The test is done in the ultrasound or radiology department or in a peripheral vascular lab.

To examine the veins:

A water-soluble gel is placed on a handheld device called a transducer, which directs the high-frequency sound waves to the artery or veins being tested.

To examine the arteries:

Blood pressure cuffs may be put around different parts of the body, including the thigh, calf, ankle, and different points along the arm. A paste is applied to the skin over the arteries being examined. Images are created as the transducer is moved over each area.

How to prepare for the test:

You will need to remove clothing from the arm or leg being examined.

How the test will feel:

There is little or no discomfort associated with this test.

Why the test is performed:

This test is done as an alternative to arteriography and venography. It may help diagnose:

• Arterial occlusion
• Blood clot
• Problems in the carotid artery blood flow caused by narrowing
• Venous insufficiency

The test may also be used to evaluate injury to the arteries and to monitor arterial reconstruction and bypass grafts.