A doppler ultrasound is a simple, non-invasive diagnostic test that uses ultrasound (high-frequency sound waves) to notice changes in the blood flow within the arteries and veins of the arms or legs. An attached computer generates blood flow anomalies based on the data from the returning sound waves from the vessels, which appears on a graph. 

Arterial doppler of upper and lower extremities helps diagnose various conditions of the arms and legs, including:

A carotid artery scan is a non-invasive and safe procedure to check the carotid artery's health. It’s a reliable tool in the form of an ultrasound that uses sound waves to visualize the interior of a carotid artery.