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Printed on 4/21/2026
For informational purposes only. This is not medical advice.
Ankle-Brachial Index (ABI) compares ankle systolic pressure to brachial systolic pressure. It is a simple non-invasive vascular screening metric used to identify probable peripheral artery disease and stratify ischemic severity patterns.
Formula: ABI = ankle systolic pressure / brachial systolic pressure.
Lower ABI values generally indicate worse lower-extremity arterial perfusion and higher PAD likelihood.
Use in suspected claudication, vascular risk assessment, diabetes/smoking populations, and baseline PAD screening workflows.
ABI may be unreliable with arterial calcification (for example, in diabetes or CKD), requiring toe-brachial or duplex-based follow-up.
For related assessments, see ASCVD Risk Calculator, Framingham Risk and Blood Pressure Calculator.
Disclaimer: This tool is for educational and informational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider with questions about your health.
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