A Carotid Ultrasound Screen is most frequently performed to detect narrowing due to a blockage in the carotid artery, a condition that substantially increases the risk of stroke. A carotid artery damaged by a fatty buildup of plaque inside the artery wall may become blocked by a blood clot, causing a stroke. This screen provides detailed pictures of the bodys two carotid arteries, which are located on each side of the neck and carry blood from the heart to the brain.