Gallbladder and Bile Duct Scan (HIDA Scan)

This scan follows bile, not anatomy. A tracer is injected into a vein, the liver pulls it out of the blood and sends it into the bile, and a camera watches where it goes — into the gallbladder, down the duct, and out into the intestine. It answers questions an ultrasound cannot, because it shows flow rather than structure.

This explanation has not been reviewed by a person yet.

What it is

An ultrasound can show a gallbladder full of stones and still leave the real question open: is anything actually blocked? This scan settles that. A small amount of a radioactive tracer is given through a vein, and because the liver treats it the way it treats the components of bile, it is extracted from the blood and excreted into the bile ducts. A gamma camera positioned over the abdomen records where the tracer travels over the following hours. A gallbladder that fills normally is a gallbladder whose duct is open. One that never appears on the images, while the rest of the biliary tree lights up, points to a blocked cystic duct. Tracer appearing somewhere it does not belong points to a leak. The images are of function, so they take time to develop — this is not a snapshot.

Why it is done

  • To investigate suspected acute inflammation of the gallbladder, where the key finding is a gallbladder that fails to fill
  • To look for a bile leak after gallbladder surgery or a liver operation, when pain or fluid follows the procedure
  • To find the level of a blockage in the bile ducts
  • To assess how well the biliary system is draining after reconstructive surgery or a transplant

What to expect

You will generally be asked not to eat for a few hours beforehand, because a gallbladder that has just emptied for a meal will not take up tracer. The injection itself is a normal IV injection. The scanning is the long part: lying still on a table under a camera, with images acquired over roughly one to four hours depending on how the tracer moves. It is painless. Some protocols include giving a medication partway through to make the gallbladder squeeze, which lengthens the appointment. The tracer leaves the body over the following day or two, largely in urine and stool. A nuclear medicine physician reads the study.

Questions worth asking

  • Is the radiopharmaceutical itself a separate line on the bill from the scan and the reading? Tracers are frequently charged on their own.
  • If a medication is given during the study to stimulate the gallbladder, is that billed as an additional drug charge?
  • The appointment can run several hours. Does the facility charge by time in the department, or a flat rate for the study?
  • If an ultrasound has already been done, what does this add, and are both being billed for the same episode?
  • Is this being performed in a hospital nuclear medicine department or a freestanding imaging center, and what is the price difference?

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