The ankle/brachial index test is used to diagnose peripheral artery disease by comparing your blood pressure at your ankle to the blood pressure in your arm. In this test, you’ll lie back on a table while a technician takes your blood pressure in both arms using an inflatable cuff. Then the blood pressure in two ankle arteries will be measured with the cuff and ultrasound wand pressed on your skin. A low index number can indicate narrowing in your leg arteries.
