Medical Definition of ankle–brachial index
: a measure of the difference in the systolic blood pressure of the arm and ankle calculated by dividing the blood pressure of the ankle by that of the arm Mercy Medical Center-Dubuque will host an ankle-brachial index screening for peripheral artery disease.—The Telegraph Herald (Dubuque, Iowa), 30 Apr. 2007 ◆A normal ankle-brachial index is considered to be between .95 and 1.2 or .9 and 1.3, with a number below .9 indicating narrowing or blockage of leg arteries. —abbreviation ABI
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