Ankle-Brachial Index (ABI)
The Ankle-Brachial Index (ABI) is a non-invasive test to assess for peripheral artery disease (PAD), narrowing of the blood vessels supplying the legs. It is done by comparing blood pressures at the ankles and arms while a patient lays in the supine position. A low ABI signifies the presence of PAD. It may also be used to assess the adequacy of treatment such as medical therapy, angioplasty, and bypass graft surgery.