HIDA Scan

A HIDA (hepatobiliary iminodiacetic acid ) scan is an imaging test. It can be used to check for problems in the liver, gallbladder, and the tubes inside and outside the liver (bile ducts). During the test, a small amount of radioactive substance (tracer) is injected into a vein in your arm or hand. Pictures are then taken to track the movement of the tracer. The test takes about 2 hours. In some cases, more pictures may need to be taken after a wait of 4 hours. You’ll be told as the test progresses how long your test may take.

Front view of liver showing gallbladder and bile duct.

Before the test

  • Follow any directions you’re given for not eating or drinking before the procedure. Your healthcare provider will give you instructions if required.

  • Tell your healthcare provider what medicines you’re taking. This includes vitamins, herbs, and over-the-counter medicines. You may be told to stop taking some or all of them in the days before the test.

  • Follow any other instructions you’re given to get ready for the test.

What to tell the technologist

Let the technologist know if you:

  • Are taking any medicines or have allergies to any medicines. Some medicines may prevent accurate test results.

  • Had recent X-rays or tests that used barium

  • Had recent surgery or illness

  • Have other health problems, such as diabetes

  • Are pregnant or think you might be pregnant

  • Are breastfeeding

  • Smoke or use other tobacco products

During the test

The test is done by a nuclear medicine or radiology technologist. It can be done in a hospital or test center:

  • You’ll lie on your back on a table. A special camera (also called a scanner) will be positioned above your belly (abdomen).

  • An IV (intravenous) needle or IV line is placed into a vein in your arm or hand. The tracer is then injected through the IV line.

  • Pictures are taken as the tracer follows the movement of bile through the liver, gallbladder, and bile ducts, and the first part of the small intestine (duodenum). Bile is a substance made by the liver that helps you digest fat.

  • You’ll need to lie still to help ensure that the pictures are not blurry.

  • Based on your healthcare provider's practices, you may be given a substance by mouth or injected through a vein that causes the gallbladder to contract and release bile. Be sure to let the technologist know if you feel discomfort. This could indicate gallbladder dysfunction.

  • If needed, more pictures may be taken after 4 hours.

After the test

  • The technologist will let you know when the test is completed.

  • The tracer will pass out of the body in your stool and urine within 24 hours. Drink plenty of fluids to help the tracer pass.

Follow-up

Your healthcare provider will go over test results with you when they are ready. This is likely within a few days of the test.

Possible risks

Possible risks of this imaging test can include:

  • Problems at the IV site

  • Allergic reaction to the tracer or medicine used during the test

  • Radiation exposure from the tracer