How the Test is Performed
The test is done in the ultrasound or radiology department, a hospital room, or in a peripheral vascular lab.
During the exam:
- A water-soluble gel is placed on a handheld device called a transducer. This device directs high-frequency sound waves to the artery or veins being tested.
- Blood pressure cuffs may be put around different parts of the body, including the thigh, calf, ankle, and different points along the arm.
How to Prepare for the Test
You will need to remove clothes from the arm or leg being examined.
How the Test will Feel
Sometimes, the person performing the test will need to press on the vein to make sure it does not have a clot. Some people may feel slight pain from the pressure.
Why the Test is Performed
This test is done as the first step to look at arteries and veins. Sometimes, arteriography and venography may be needed later. The test is done to help diagnose:
- Arteriosclerosis of the arms or legs
- Blood clot (deep vein thrombosis)
- Venous insufficiency
The test may also be used to:
- Look at injury to the arteries
- Monitor arterial reconstruction and bypass grafts
Risks
There are no risks from this procedure.
Considerations
Cigarette smoking may alter the results of this test. Nicotine can cause the arteries in the extremities to constrict.