NICE explains that the ankle brachial pressure should be measured with the person resting and supine if possible, and that measurements should be taken manually using a doppler probe of suitable frequency in preference to an automated system. The index in each leg should be calculated by dividing the highest ankle pressure by the highest arm pressure.
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Cite this: Dr Rob Hicks. Quiz: Test Your Knowledge of Peripheral Arterial Disease Guidelines - Medscape - Feb 26, 2021.