Ankle-Brachial Index (ABI)
Ankle-brachial index (higher ankle / higher brachial per leg) with the PAD severity bands; the lower of the two legs governs (Aboyans 2012).
Open the calculator → Runs in your browser. Data leaves only if you deliberately send a problem report from the interactive tool.
Example
- Right ankle systolic pressure
- 90 mmHg
- Left ankle systolic pressure
- 120 mmHg
- Right brachial systolic pressure
- 100 mmHg
- Left brachial systolic pressure
- 100 mmHg
Result: Right leg ABI 0.90 (lower index governs): mild-to-moderate peripheral artery disease (0.41-0.90).
The tool opens with these values already filled in. Replace them with your own.
What the result means
- Index
- per leg, ankle systolic (higher of DP/PT) / higher brachial systolic; the lower leg index governs the diagnosis.
- Bands
- > 1.40 non-compressible (use toe-brachial), 1.00-1.40 normal, 0.91-0.99 borderline, 0.41-0.90 mild-to-moderate PAD, <= 0.40 severe PAD.
What you enter
- Right ankle systolic pressure (higher of DP / PT)
- Left ankle systolic pressure (higher of DP / PT)
- Right brachial systolic pressure
- Left brachial systolic pressure
How this is calculated
Aboyans V, Criqui MH, Abraham P, et al. Measurement and interpretation of the ankle-brachial index. Circulation. 2012;126(24):2890-2909. Read the source ↗
A reference and educational tool. Not medical, legal, or financial advice, and not a substitute for clinician judgment.