Our screening program offers the following three, painless, noninvasive tests: Carotid Duplex (carotid artery ultrasound scan) to detect stenosis or narrowing of the carotid arteries Abdominal Duplex (aorta ultrasound scan) to detect abnormalities in the aorta Ankle Brachial Index (test of blood flow in the legs) to detect reduced blood flow to muscles and tissues.