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Noninvasive vascular laboratory findings remain impor- tant in the diagnosis of peripheral arterial disease (PAD). In many circumstances they are as accurate as invasive imaging and have the advantage of being quick and in- expensive. The two basic modalities of evaluation are the indirect methods (ankle brachial pressure index, Doppler wave forms, treadmill exercise) that provide location and functional severity of disease, and the direct method of evaluation, colour duplex imaging (CDI), which provides more specific anatomical and physiological information. [ABSTRACT FROM AUTHOR]