Why might I need a venogram? A venogram is used to confirm a diagnosis of DVT. It is also used to tell if a vein problem is a blood clot or another kind of blockage. It can be used to look at vein problems present at birth (congenital) or to find a vein for bypass graft surgery.

How serious is a venogram?

What are some of the possible risks? There is a very slight risk of an allergic reaction if the procedure uses an injection of contrast material. In rare cases, a venogram can cause a deep vein thrombosis (blood clot). There is a risk of injury to the kidneys with contrast injection.

Is a venography painful?

Although venograms are relatively safe procedures, some people do experience complications such as: Pain or discomfort when the needle is inserted into the vein or if the vein needs to be inserted deeper inside the vein.