Health Encyclopedia

Doppler ultrasound exam of an arm or leg

Definition

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 extremity 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 a blood clot, venous insufficiency, arterial occlusion (closing), abnormalities in the carotid artery blood flow caused by a narrowing and to evaluate trauma to the arteries. The test may also be used to monitor arterial reconstruction and bypass grafts.

Normal Values

The vessels show no evidence of narrowing or closure.
The arteries have normal systolic and diastolic components.
Blood pressure is normal.

What abnormal results mean

In the veins:
- Venous occlusion (closing of vein)
- Blood clots
In the arteries:
- Arterial occlusive disease
- Spastic arterial disease (arterial contractions brought on by cold or emotion)
- Embolic arterial occlusion (obstruction in the artery by a blood clot, a fat globule, or an air bubble)

Additional conditions under which Doppler ultrasound may be performed include the following:

What the risks are

There are no risks specifically associated with this procedure.

Special considerations

Cigarette smoking may alter the results of this test, because nicotine can cause the arteries in the extremities to constrict.

Quitting smoking significantly lowers the risk of problems with the heart and circulatory system. Most smoking-related deaths are caused by cardiovascular problems, not lung cancer.

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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