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What is a venogram used for?

A venogram is used to confirm a diagnosis of deep vein thrombosis (DVT) and to distinguish clot formation from other venous obstructions. It can also be used to evaluate congenital (present at birth) venous malformations or to locate a vein for arterial bypass graft surgery. It may be used to determine the cause of swelling or pain in the extremity and also to determine the source of pulmonary emboli (blood clots that have traveled to the lung).

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