Venous Ultrasound of the Legs (Lower Extremity Doppler)

This type of ultrasound shows if there is a blockage in a leg vein. Such blockages are usually caused by blood clots, which can be dangerous and even life threatening if they break loose and travel through the blood to the lungs. If you have pain or swelling in one leg, your doctor may order an ultrasound to determine whether your symptoms are caused by a blockage.
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