Ency. home > Test > D > Duplex/doppler ultrasound exam of extremity

Duplex/doppler ultrasound exam of extremity   

Overview | Risks | Results

Definition:

This test examines the blood flow in the major arteries and veins in the arms and legs with the use of ultrasound (high-frequency sound waves that echo off the body). This test combines the Doppler ultrasonography, which uses audio means to hear the blood flow and duplex ultrasonography, which provides a visual image.

How the Test is Performed

The test is done in the ultrasound or radiology department.

To examine the veins: A water-soluble gel is placed on the transducer (a hand-held device that directs the high-frequency sound waves to the artery or vein being tested) and the skin over the veins of the extremity being tested. Blood flow on a Doppler examination creates a "swishing" sound. Both the superficial and deep venous systems are evaluated. Picture images are also obtained.

To examine the arteries: Blood pressure cuffs will be put around the thigh, calf, and ankle to examine the legs. In the arms, the blood pressure cuffs are placed at different points along the arm. A conductive paste is applied to the skin over the arteries being examined. The cuff will be inflated above the normal systolic blood pressure for the extremity. The transducer is placed near the cuff and the pressure in the cuff is released slowly. When the "swishing" is detected, that is recorded as the blood pressure. This is repeated for each cuff. Picture images may also be obtained.

How to Prepare for the Test

Remove clothing from the extremity.

Infants and children:
The physical and psychological preparation you can provide for this or any test or procedure depends on your child's age, interests, previous experience, and level of trust. For specific information regarding how you can prepare your child, see the following topics as they correspond to your child's age:

• Infant test or procedure preparation (birth to 1 year)
• Toddler test or procedure preparation (1 to 3 years)
• Preschooler test or procedure preparation (3 to 6 years)
• Schoolage test or procedure preparation (6 to 12 years)
• Adolescent test or procedure preparation (12 to 18 years)

How the Test will Feel

There is no discomfort.

Why the Test is Performed

This test is done as an alternative to arteriography and venography. It may help diagnose a blood clot or 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.

Ency. home > Test > D > Duplex/doppler ultrasound exam of extremity

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