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A Doppler ultrasound is a noninvasive test that can be used to estimate the blood flow through your blood vessels by bouncing high-frequency sound waves (ultrasound) off circulating red blood cells. A regular ultrasound uses sound waves to produce images, but can't show blood flow. A Doppler ultrasound may help...What is a Doppler ultrasound device?
A Doppler ultrasound device, called a transducer, will be moved along your skin in the area that is being studied. The transducer uses high-velocity sound waves to evaluate the blood flow through your blood vessels. The test can show narrowed blood vessels, blood clots, or areas where the blood is flowing backward.