X-ray s are taken of the gallbladder, which is now filled with contrast dye. Every time an X-ray picture is taken, you will be instructed to breathe in and remain still. After the test After the Test You dress and are free to leave. If the gallbladder is not clearly seen on the X-ray , the test may be repeated the next morning after a double dose of dye tablets. The doctor examines the X-ray film, called a cholecystogram, for evidence of disease.
Gallstones usually show up as dark spots against a bright background.
If the gallbladder is sluggish or infected, other abnormalities of shape or structure may be detected. It provides a better view of the gallbladder than regular X-rays. It also demonstrates radiolucent gallstones not seen on plain films of the abdomen. It entails exposure to radiation. There is a risk of adverse reactions to the contrast dye.