Introduction
A HIDA scan (cholescintigraphy) uses a small amount of radioactive tracer to show bile flow from the liver into the gallbladder and bile ducts. It helps assess gallbladder function and blockage.
Ultrasound shows stones; HIDA often shows whether the gallbladder empties properly or whether bile duct obstruction is present. Radiation exposure is low—your doctor weighs need and alternatives.
Why this test is done
HIDA Scan is commonly considered in situations such as:
- Right upper abdominal pain with suspected gallbladder dysfunction
- Symptoms persist when ultrasound shows no stones
- Suspected bile leak or duct obstruction in selected cases
- Assessing gallbladder function before surgery in some settings
- Monitoring known biliary disease when symptoms change despite prior normal imaging
How the test is done
- Tracer is injected into a vein.
- A gamma camera takes images over a set period.
- CCK or a fatty meal may be given to measure gallbladder emptying (ejection fraction).
- The study can take an hour or longer.
Preparation and precautions
- Strict fasting for several hours is usually required—follow center instructions exactly.
- Opioid pain medicines can affect results—tell staff in advance.
- Report pregnancy, breastfeeding, allergies, and prior gallbladder surgery.
- Bring prior ultrasound and lab reports.
Understanding results
Your clinician interprets lab or imaging ranges together with your symptoms. Online “normal values” do not always apply to your case.
- Non-visualization of the gallbladder may suggest obstruction or inflammation.
- Low ejection fraction may suggest dyskinesia—cutoffs vary by center.
- The report alone does not mandate surgery; symptoms and other tests matter.
- Your surgeon or gastroenterologist explains next steps.
Risks or limitations
- Low-level radiation exposure.
- Injection site discomfort or rare allergic reaction.
- CCK may cause abdominal cramping or nausea.
- Usually avoided in pregnancy when alternatives exist.
After the test
- Drink fluids and resume activity as instructed.
- Breastfeeding mothers may receive special guidance.
- Take the report to your surgeon or gastroenterologist.
- Seek emergency care for severe pain, fever, or worsening jaundice.
Frequently asked questions
Should I have ultrasound or HIDA first?
Ultrasound is often first; HIDA is added when function or obstruction must be assessed.
Is the radiation dangerous?
Dose is usually low; benefits and risks are weighed individually. Pregnancy needs special caution.
Does low ejection fraction always mean surgery?
No. Decisions depend on symptoms, history, and specialist advice.
Important caution
This article is general health information. It is not personal medical advice or a prescription.
Your clinician decides whether you need this test, how to prepare, and what the results mean. If you have emergency symptoms, go to hospital without waiting for a lab report.