HIDA scan
About this test
A hepatobiliary iminodiacetic acid (HIDA) scan is an imaging procedure used to diagnose problems of the liver, gallbladder and bile ducts. For a HIDA scan, also known as cholescintigraphy or hepatobiliary scintigraphy, a radioactive tracer is injected into a vein in the arm. The tracer travels through the bloodstream to the liver, where the bile-producing cells take it up. The tracer then travels with the bile into the gallbladder and through the bile ducts to the small intestine.
Why it's done
A HIDA scan is most often done to evaluate the gallbladder. It's also used to look at the bile-excreting function of the liver and to track the flow of bile from the liver into the small intestine. A HIDA scan is often used with X-ray and ultrasound. A HIDA scan might help in the diagnosis of several diseases and conditions, such as: Gallbladder inflammation, called cholecystitis. Bile duct obstruction. Congenital problems in the bile ducts, such as biliary atresia. Postoperative complications, such as bile leaks and fistulas. Assessment of liver transplant. Your health care provider might use a HIDA scan as part of a test to measure the rate at which bile is released from your gallbladder, a process known as gallbladder ejection fraction.
Risks and complications
A HIDA scan carries only a few risks. They include: Allergic reaction to medicines containing radioactive tracers used for the scan. Bruising at the injection site. Radiation exposure, which is small. Tell your health care provider if there's a chance you could be pregnant or if you're breastfeeding. In most cases, nuclear medicine tests, such as the HIDA scan, aren't performed in pregnancy because of potential harm to the baby.
Understanding your results
To make a diagnosis, your health care provider will consider your symptoms and other test results as well as the results of your HIDA scan. Results of a HIDA scan include: Typical. The radioactive tracer moved freely with the bile from the liver into the gallbladder and small intestine. Slow movement of radioactive tracer. Slow movement of the tracer might indicate a blockage or obstruction, or a problem in liver function. No radioactive tracer seen in the gallbladder. Inability to see the radioactive tracer in the gallbladder might indicate acute inflammation, called acute cholecystitis. Low gallbladder ejection fraction. The amount of tracer leaving the gallbladder is low after medicine is given to make it empty. This might indicate chronic inflammation, known as chronic cholecystitis. Radioactive tracer detected in other areas. Radioactive tracer found outside of the biliary system might indicate a leak. Your health care provider will discuss the results with you.
Disclaimer: August is a health information platform and its responses don't constitute medical advise. Always consult with a licenced medical professional near you before making any changes.