What is the role of an ankle-brachial index in an exam for peripheral vascular disease (PVD)?

Updated: Dec 31, 2017
  • Author: Everett Stephens, MD; Chief Editor: Erik D Schraga, MD  more...
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Answer

The ABI can be determined at the bedside. Pressure is measured with Doppler ultrasonography at the brachial artery and at the posterior tibialis artery. The ankle systolic pressure is divided by the brachial pressure, both as measured in the supine position. Normally, the ratio is greater than 1. In severe disease, it is less than 0.5.


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