Carotid stenosis may be completely asymptomatic, which means that it can only be detected via neck auscultation during a physical examination. Otherwise, diagnosis is made using Doppler ultrasonography (Duplex), which is a non-invasive exam that makes it possible to determine the presence of atherosclerosis and the severity of the stenosis.

Carotid stenosis can also be diagnosed from the manifestation of temporary or permanent neurological symptoms, such as loss of vision (often in only one eye), loss of speech or partial paralysis of the face, an arm or a leg. It is important to note that the right hemisphere of the brain controls the left side of the body, while the left hemisphere controls the right side.

In all cases, an emergency examination of the patient’s health must be carried out. The diagnosis will be made using Doppler ultrasonography (Duplex), and sometimes, if surgery is to be considered, confirmed via an angio-MRI or CT Scan.