Enter ankle and brachial systolic pressures to get the ABI for each leg — with AHA interpretation and compression safety guidance built in.
Clinical decision support only — not a diagnosis. Compression decisions must follow clinical judgment and your facility's protocol. ABI >1.40 suggests noncompressible vessels; consider toe-brachial index.
For each leg, take the higher of the two ankle pressures (posterior tibial or dorsalis pedis) and divide it by the higher of the two brachial pressures. The patient's overall ABI is the lower of the two leg values. Interpretation follows the American Heart Association scientific statement (Aboyans et al., Circulation 2012):
Compression therapy on a limb with significant arterial disease can cause harm — which is why vascular assessment comes before the compression decision, not after. Commonly cited thresholds in wound-care references: ABI above 0.80, standard compression is generally considered safe; 0.50–0.80, reduced compression only under specialist supervision; below 0.50, compression is generally contraindicated and urgent vascular referral is indicated. Document the ABI with every compression decision.
Divide the highest ankle systolic pressure (posterior tibial or dorsalis pedis) by the highest brachial systolic pressure. Calculate each leg separately; the patient's ABI is the lower of the two.
Per the American Heart Association scientific statement, 1.00–1.40 is normal, 0.91–0.99 is borderline, 0.90 or less is abnormal and consistent with peripheral artery disease, and above 1.40 suggests noncompressible vessels.
Compression decisions must follow clinical judgment and local protocol. Commonly cited thresholds: above 0.80 standard compression is generally considered safe; 0.50–0.80 reduced compression only under specialist supervision; below 0.50 compression is generally contraindicated and urgent vascular referral is indicated.
Values above 1.40 suggest noncompressible, calcified vessels — common in diabetes and chronic kidney disease. The ABI may be falsely elevated; a toe-brachial index (TBI) is the recommended alternative.
Reviva keeps vascular assessments with the wound record — pressures, interpretation, and photos in one place, visit after visit.
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