Professional and Linguistic Assessments Board (PLAB) Practice Exam

Why is a carotid Doppler performed?

1. To assess blood flow in the carotid arteries

2. To evaluate heart valve function

3. To identify brain tumors

4. To check for deep vein thrombosis

The correct answer is: To assess blood flow in the carotid arteries

A carotid Doppler is specifically performed to assess blood flow in the carotid arteries, which are the major vessels supplying blood to the brain. This non-invasive ultrasound test helps to visualize the carotid arteries and can identify abnormalities such as stenosis (narrowing) or occlusion (blockage). By evaluating the flow of blood through these arteries, healthcare providers can assess the risk of stroke or other cerebrovascular conditions. The other options relate to different assessments: heart valve function is evaluated through echocardiograms, brain tumors may be identified using imaging techniques like MRI or CT scans, and deep vein thrombosis is typically diagnosed via ultrasound of the veins in the legs. Each of these conditions requires different diagnostic approaches, which underscores the specificity and importance of the carotid Doppler study in vascular assessments.