Duplex/doppler ultrasound exam of extremity, vascular ultrasound
Key points
- 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).
- 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 on the skin over the veins of the limb being tested.
- Inform the heath care provider of any medications that you are taking, especially blood pressure and vascular medications which may interfere with the results.
- The preparation you can provide for this procedure depends on your child's age and experience.
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). The test combines Doppler ultrasonography, which uses audio measurements to "hear" and measure 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 on the skin over the veins of the limb being tested. Blood flow on a Doppler examination creates a "swishing" sound. Both the superficial (close to the skin) and deep veins are evaluated. Visual images are also obtained.
To examine the arteries: Blood pressure cuffs are placed around the thigh, calf, and ankle to examine the legs. To test 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" sound is detected, the measurement is recorded as the blood pressure. This is repeated for each cuff. Visual images may also be obtained.
How to prepare for the test
Remove clothing from the extremity. Inform the heath care provider of any medications that you are taking, especially blood pressure and vascular medications which may interfere with the results.
For infants and children:
The preparation you can provide for this procedure depends on your child's age and experience. For specific information regarding how you can prepare your child, see the following topics:
- 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 from the ultrasound device. You will feel tightening in your arm or leg if the pressure cuff is used. This pressure will last only a few moments.
Why the test is performed
Written and revised by
David Cohen, M.D.
Our doctors write and review articles for accuracy and keep them up to date.
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