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This test uses sound waves to locate blood clots in the veins of the affected leg(s) or arm(s). While you lie on a table, a technologist will scan your leg(s) or arm(s) with an ultrasound probe. They will press down with the ultrasound probe from time to time to further determine presence or absence of blood clots. There is no prep for this exam. This study typically last approximately ½ hour per leg or arm.