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Results
The images are reported by a radiologist, usually within a few days, though urgent cases are reported sooner. Your doctor will explain what the scan shows and whether you need treatment such as ERCP, surgery or further tests.
This article is educational and does not replace your doctor's advice. Seek urgent care for any red-flag symptoms.
What is it?
MRCP stands for magnetic resonance cholangiopancreatography. It is a type of MRI scan that uses a strong magnet and radio waves, not X-rays, to take pictures of the bile ducts (the small tubes that carry bile from the liver to the gut), the gallbladder, and the pancreatic duct. Fluid in these ducts shows up brightly, so the scan can map them without any needle or tube being put into the ducts. Sometimes a dye (contrast) is given through a vein for extra detail, and sometimes a drink or injection is used to make the pictures clearer.
Why is it done?
It is used to look for stones in the bile duct, narrowing (strictures), blockage, cysts, inflammation of the ducts (such as in primary sclerosing cholangitis), and problems of the pancreas and gallbladder, and to find the cause of jaundice (yellow skin and eyes), abnormal liver tests or upper belly pain. Because it does not use radiation and does not carry the risks of ERCP (the camera-and-dye procedure), it is often used to decide whether an ERCP is really needed, and to plan treatment or surgery.
Who needs it?
- People with jaundice, itching or abnormal liver tests that suggest a blocked bile duct
- People with upper belly pain after gallstones or with suspected stones in the bile duct
- People with recurring pancreatitis or a suspected pancreatic duct problem or cyst
- People with known or suspected bile duct disease, such as primary sclerosing cholangitis or strictures, for diagnosis and follow-up
- People who have had bile duct or liver surgery or transplant and need a check
Before the procedure
- You will usually be asked not to eat for several hours before the scan, and sometimes to avoid fluids, so the stomach and bowel are empty and the bile ducts are better seen. The centre will give the exact fasting times.
- Tell the team if you have a pacemaker, defibrillator, nerve stimulator, cochlear (ear) implant, brain aneurysm clips, metal in the eye, or other implants or metal fragments. MRI uses a strong magnet, so some devices are unsafe or need checking first. Bring any device cards.
- Tell the team if you may be pregnant, have kidney disease, a history of allergy to contrast dye, or are very afraid of small spaces (claustrophobia). Anxiety medicine or an open scanner may be possible.
- Remove all metal: jewellery, watch, hair clips, belts, hearing aids, bank cards and phone. You may change into a gown. Women should remove clothing with metal threads.
- No sedation is usually needed, and you can eat and drive afterwards. If you are fasting for Ramadan, tell the team so the appointment can be timed suitably.
During the procedure
You lie on a table that slides into a wide tube-shaped scanner. The machine makes loud knocking and buzzing noises, so you are given ear protection or headphones. You must lie still, and you will be asked to hold your breath for short periods (often 15 to 25 seconds) several times while pictures are taken. A call button lets you talk to the radiographer, who watches you throughout. If contrast dye is used, it is given by a small drip in the arm. The scan usually takes about 20 to 40 minutes. There is no pain, though the lying still and noise can be tiring.
After the procedure
You can usually go home straight away, eat and return to normal activities. If you had a contrast injection, drinking water helps flush it out, and you will be told if any special precautions apply, for example after kidney problems. If you were given a sedative or anti-anxiety medicine, do not drive until it wears off. A radiologist (a doctor who reads scans) studies the images and sends a report to your doctor.
Risks
- MRI uses no radiation and is generally very safe.
- The magnet can be dangerous with some implants or metal objects, which is why the safety questionnaire matters.
- Some people feel anxious in the narrow scanner or are bothered by noise, and may need to stop the scan or have a sedative.
- If contrast dye is used, there is a small chance of allergic reaction, and the dye needs care in people with severe kidney disease. Your team will check this beforehand.
- Images can be blurred if you move or cannot hold your breath, and small stones or tiny narrowings can be missed. If the answer is unclear, another test may be needed.
- MRCP only takes pictures; it cannot remove stones or place stents, which are done by ERCP.
When you get results
Alternatives if you decline
Alternatives include an ultrasound (often the first test, with no radiation but less detailed for the lower ducts), a CT scan (uses radiation), endoscopic ultrasound (a camera scope with an ultrasound probe, done under sedation, which is very good for small stones and the pancreas), and ERCP (which treats but carries more risk and is usually done only when treatment is expected). MRCP is chosen when a detailed, safe, non-invasive map of the ducts is needed. Declining it may leave the cause of your symptoms unclear or lead to a more invasive test.
Questions to ask your doctor
Save this list or print it before your appointment — doctors appreciate prepared patients.
- Is it safe for me to have an MRI with my implants or devices?
- Do I need to fast, and for how long?
- Will I need an injection of contrast dye?
- What can I do to cope with the noise or the small space?
- If the scan shows a stone or narrowing, what treatment comes next?
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Status: Approved for publication by SGA; individual clinician review is ongoing · Published 24/04/2026
For general education only; it does not replace your doctor’s advice. Individual clinician review of this guide is ongoing. SGA clinician? Review this guide