Interpretation of the Results of Ankle-Brachial Index Measurement



>1.30     Poorly compressible vessels, arterial calcification

0.90–1.30     Normal

0.60–0.89     Mild arterial obstruction

0.40–0.59     Moderate obstruction

<0.40     Severe obstruction



Obtained by measuring the systolic blood pressure (using a properly sized sphygmomanometer) in the ankle divided by that in the brachial artery. The presence of arterial calcification can lead to an overestimate in the index.



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