In most people, carotid stenosis does not cause any symptoms. For the general population, there has not been enough evidence from scientific studies to prove that testing for carotid stenosis in people without symptoms is beneficial. The US Preventive Services Task Force does not currently recommend testing for carotid stenosis in the general population. But in certain populations, it might be useful to test for carotid stenosis when there are no symptoms. An example of a special case is someone who is about to have surgery and who is known to have poor blood flow through other blood vessels in the body, in particular the coronary arteries of the heart. In this case, testing for carotid stenosis before surgery may be recommended. A JAMA Clinical Guidelines Synopsis article in the January 13, 2015, issue of JAMA summarizes the most up-to-date evidence on this topic.