The ankle-brachial index test is a quick, noninvasive way to check your risk of peripheral artery disease (PAD). The ankle-brachial index test compares your blood pressure measured at your ankle with your blood pressure measured at your arm. A low ankle-brachial index number can indicate narrowing or blockage of the arteries in your legs, increasing your risk of circulatory problems, and possibly causing heart disease or stroke.
Reference: www.mayoclinic.org
For more information, Click Here