A venogram, also known as venography, is a test that lets your doctor see your veins on an X-ray. (Veins cannot be seen on a normal X-ray.) You'll be injected with a liquid called "contrast dye" to make the veins visible on the X-ray. The
Venography (also called phlebography, ascending contrast phlebography, or contrast venography) is an invasive diagnostic test that provides a constant image of leg veins on a fluoroscope screen. Venography identifies the location, extent, and degree of attachment of the blood clots, and enables the condition of the deep leg veins to be assessed. It is especially useful when there is a strong suspicion of deep vein thrombosis, but non-invasive tests have failed to identify the disease.