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.

You will need to remove clothing from the extremity being examined.

There is little or no discomfort associated with this test.

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.

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

• 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:

• Aortic dissection
• Arteriosclerosis of the extremities
• Coarctation of the aorta
• Deep venous thrombosis
• Stroke secondary to carotid stenosis
• Superficial thrombophlebitis
• SVC obstruction
• Thromboangiitis obliterans
• Vascular tumors of the extremities

There are no risks specifically associated with this procedure.

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.