ankle-arm index


an·kle-bra·chi·al in·dex

(ABI) (ang'kel-brā'kē-ăl in'deks) Objective measurement of arterial insufficiency based on the ratio of ankle systolic pressure to brachial systolic pressure. An ABI of 1.0 indicates absence of arterial insufficiency; an ABI of less than 0.50 indicates severe arterial insufficiency.
Synonym(s): ankle-arm index.