A fistulagram is a procedure done by a radiologist using X-ray to locate the places where the vessels are narrowed or blocked.

A fistula is a surgical connection between an artery and a vein. It is created to provide enough blood flow at the appropriate pressure to make hemodialysis effective and possible.

You may be having symptoms that suggest a blockage of your fistula. The blood vessels that are connected to the fistula are subjected to higher rates of blood flow and pressure. Often, this results in the formation of scar tissue, causing narrowing of the fistula or blood vessels. A fistulagram can identify exactly where the artery or vein is blocked, how severe the blockage is, and what is causing the blockage.

The radiologist places tiny tubes, called catheters, in your fistula. The doctor then injects special dye so it can be seen on X-rays. Several X-ray pictures are then taken.