Lower Extremity Arterial Ultrasound
A lower extremity arterial ultrasound is used to look at the blood flow
at different segments of your legs. Normally blood pressure is similar
whether it is measured in the legs or arms. If blood pressure is lower
in the legs, it usually means that cholesterol buildup inside the leg
arteries is interfering with circulation. By taking accurate blood pressure
measurements at different locations along your legs, your doctors can
determine if you have any arterial narrowing and, if so, where.
What to Bring
- Your physician order (your physician may have already sent this to us)
- Personal ID
- Insurance Card
How to Prepare
- You do not have to do anything special to prepare for a lower extremity
arterial ultrasound.
- You may want to wear shorts for this exam, and your feet should be bare
during the test. If you are not wearing shorts, you may have to change
into a hospital gown.
- If you have a history of surgery on your legs or arms (i.e., stents, grafts),
you should inform the technologist.
- If you had a recent diagnosis of a deep vein thrombosis (DVT) or blood
clot, you should inform the technologist.
- No risks are associated with a lower extremity arterial ultrasound. Unlike
X-rays, radiation is not involved with this test.
What to Expect
- You lie on a table and a technologist wraps blood pressure cuffs around
both of your legs in three section locations (including the thigh, calf
and ankle), both of your big toes and both of your upper arms. He or she
then places some clear jelly onto your skin to help the Doppler sensor,
which resembles a wand or pen, slide around easily and to help conduct
sound waves through your skin.
- Each cuff is inflated to exert pressure on your leg. This temporarily cuts
off circulation in the leg. Many patients briefly experience some cramping
pain in the calf or thigh (similar to the sensation you experience when
a blood pressure cuff is inflated around your arm). As the cuff is deflated,
the technologist places a Doppler sensor against your foot to detect the
moment when blood flow starts up again. When it does, you will hear a
noise that sounds like your heartbeat. Checking the air pressure of the
deflating cuff at this time shows the leg's blood pressure.
- After all the cuffs on one side have been tested, the other leg is checked
in the same manner. For comparison, you also have your blood pressure
checked in each arm using the Doppler technique.
- Please allow 45 minutes from registration to completion of test.
Getting the Results
A radiologist (a doctor who is specially trained in reading and interpreting
diagnostic and ultrasound images) will interpret the ultrasound results
and send the information to your provider.