ABI stands for Ankle Brachial Index. The test involves measuring blood pressure in the arms and legs. The blood pressure normally should be same in all parts of the body. Discrepancy in arm and leg blood pressure indicates blockage in the arteries. Blockage is usually due to atherosclerosis.
This test is used to detect PAD (Peripheral Arterial Disease). It is ordered commonly in patients who have leg pain with walking, diabetes mellitus, history of heart attacks, high cholesterol, more than 65 years of age and those who have use(d) tobacco.