What is a venogram?

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A venogram is a procedure that provides x-ray visualization of the veins, particularly in the lower extremities (legs). A special dye is injected that is visible upon x-ray. The contrast dye allows the physician to evaluate the size and condition of the veins. A venogram is one of the more accurate tests used for diagnosing deep vein thrombosis (DVT), but can also be used to diagnose other abnormalities.