Duplex Carotid Scan

The arteries in the neck (carotids) are scanned to check blood flow and for the presence of cholesterol plaques. This scan is often used after transient ischaemic attack (TIA or mini-stroke).

Information for doctors

This is an ultrasound scan that can detect the presence of carotid bifurcation disease and determine its severity (% diameter stenosis). In addition it can determine the patency and direction of flow in the vertebral arteries (subclavian steel).


- Patients with coronary or peripheral vascular disease, diabetes, hypertension or hyperlipidaemia for the presence of asymptomatic carotid stenosis.

- The presence of a cervical bruit or screening of asymptomatic individuals (to identify the presence of carotid bifurcation disease and to detect progression of a known internal carotid stenosis).

- Carotid territory symptoms: Transient monocular blindness, hemispheric sensory or motor TIA’s or non-disabling stroke.

- Symptoms suggestive of vertebrobasilar insufficiency: Dizziness, vertigo, diplopia or drop attacks.

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