Arterial and Venous Doppler
This technique uses sound waves to assess blood flow throughout the arteries and veins of the legs and feet. The tests can detect the narrowing of, or blockages in, arteries and veins, and the presence of blood clots.
In fact, the most common reason for a venous ultrasound exam is to search for blood clots, especially in the veins of the leg. This condition is often referred to as DVT (deep vein thrombosis). If, as often happens, these clots break off and pass into the lungs, they can cause a dangerous condition called pulmonary embolism. However, if the blood clot is found early enough, treatment can be started to prevent it from getting into the lungs.