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Medical Definition of Trendelenburg's test
1. A test of the valves of the leg veins; the leg is raised above the level of the heart until the veins are empty and is then rapidly lowered; in varicosity and incompetence of the valves the veins will at once become distended, but placement of a touriquet around the leg will prevent distention of veins below the incompetent perforators or valves below the tourniquet. (05 Mar 2000)