Biliary Atresia

An important function of the liver is make a substance called bile. Bile is a liquid which passes into the gut through small tubes called bile ducts and is stored in the gall bladder. Bile contains waste products and other products needed to digest food.

*This website provides general information but does not replace medical advice. It is important to contact your/your child’s medical team if you have any worries or concerns
Download Our Biliary Atresia leaflet for full information and diagrams

What is biliary atresia?

Biliary atresia is a medical condition. It can occur either:

  • Before birth due to the bile ducts developing abnormally
  • Shortly after birth due to the bile ducts becoming inflamed or obstructed

In most babies with biliary atresia bile ducts on the inside and outside of the liver are affected eventually leading to a complete blockage of bile flow from the liver. This in turn causes scarring (fibrosis) in the liver.

What causes biliary atresia?

The cause of biliary atresia is unknown. Research is being carried out but it hasn’t provided any definite answers yet. Parents often feel guilty that they may have, in some way, contributed to their child having the condition. These feelings are understandable but there is no evidence to suggest that biliary atresia is hereditary (can be passed on to children by their parents) or due to anything parents might have done or taken. People with biliary atresia will not pass the condition on to their own children.

What are the signs of biliary atresia?

In the first weeks of life babies with biliary atresia often seem well apart from being jaundiced (yellow discolouration of the skin and of the whites of the eyes) and in some cases feeding more often. Prolonged jaundice (jaundice lasting more than two weeks in a full term baby or three weeks in a pre-term baby) should be explored further and can be a key sign of biliary atresia.

Other important signs are:

  • Pale poo – normally the stools of a baby are green or yellow. If the stools of a baby are grey, white, fawn or pale then this can be an indication of liver disease.
  • Urine colour – normally the urine of a newborn baby is colourless. If a baby’s urine is persistently yellow or dark in colour this can be an indication of liver disease.

Read more on prolonged jaundice in babies

How is biliary atresia diagnosed?

If a baby has the signs and symptoms above then they may be admitted to hospital for further investigation. A number of investigations will need to be carried out in order to make a diagnosis. These may include:

  • Blood tests
  • Urine test
  • An ultrasound
  • Liver excretion test
  • Some children will need a liver biopsy and/or a small operation to confirm or rule out a diagnosis.

These investigations are completed over the course of a few days. Find out more about routine liver investigations.

How can biliary atresia be treated?

If the tests show that there is a strong indication that your baby has biliary atresia, he/she will require surgery. This will involve carrying out an investigation called an operative cholangiogram under a general anaesthetic to confirm the diagnosis. If biliary atresia is confirmed then this will be followed by a “Kasai procedure”, usually done under the same general anaesthetic at the same time. The aim of the procedure is to help bile drain from the liver into the gut.

Find out more about the Kasai operation.

Are there any other complications of biliary atresia?

Between 10 – 20 babies out of 100 with biliary atresia may have additional problems found during surgery. These may include the following:

  • Some children with biliary atresia can have multiple small spleens (polysplenia) or the spleen can be absent (asplenia).
  • The position of the small intestine within the abdomen may be abnormal (malrotation). This will need to be corrected at the same time as the Kasai operation.
  • Heart defects

If some or all of these complications occur it is a condition known as “biliary atresia – splenic malformation syndrome (BASM)”. This group of children with biliary atresia may be less likely to clear their jaundice after the operation. They also need additional tests such as a heart scan to check for problems. It may also be necessary for them to take daily antibiotics to reduce their risk of infection.

What happens if the biliary atresia is not treated or treatment is unsuccessful?

If a baby has not had a Kasai procedure in the first two to three months of life the success rate of the operation is very low. If biliary atresia is not treated or the treatment isn’t successful the bile produced in the liver builds up causing damage to the cells of the liver eventually resulting in severe scarring (cirrhosis). If this continues liver function deteriorates, complications occur and general health suffers. Liver transplantation is often the accepted form of treatment. Transplant is a huge step and is only considered when other treatments are ineffective. If liver transplantation is an option for your child this will be discussed with you by your child’s medical team. The aim of liver transplantation is to restore your child to good health.

Find out more about liver transplantation.

What other problems might occur?

In any baby who undergoes a Kasai procedure, even if they clear their jaundice completely, a number of problems may occur:

  • Cholangitis (an infection of the bile ducts in the liver resulting in inflammation)
  • Ascites  (an abnormal collection of fluid in the abdomen)
  • Portal hypertension  (increased blood vessel pressure caused by scarring of the liver)
  • Pruritus (itching)

What will happen in the future?

Your baby/child’s growth and development will be followed up by periodic visits to the hospital. How often you will need to go to the hospital will vary for each child. Blood tests will be done to measure your child’s bilirubin level and liver function. Periodically an ultrasound will be performed to assess the size of the liver and other structures in the abdomen (e.g. the spleen).


If Biliary Atresia is confirmed then this will be followed by a Kasai procedure (Kasai portoenterostomy). The aim of the procedure is to help bile drain from the liver into the gut.

Download Our Biliary Atresia Leaflet for full information and Diagrams

Before the operation

Blood tests will be performed and will include checking your baby’s blood group in case there is a need to give blood to your baby before, during or after surgery. Your baby may be given special medicines to prepare the gut for surgery. Your baby will not be fed milk for a number of hours before the operation. This will differ depending on which liver unit your baby is having the operation at. The team caring for your baby will explain what this involves. If you are breast feeding, speak to your nurse regarding expression and storage of milk. You will be allowed to go down to the operating theatre with your baby and stay until just before your baby is asleep.

During the operation

The aim of the operation is to make a drainage tube to allow bile to drain from the liver. During the operation the surgeon will look at the liver and see if there are abnormalities. The surgeon will also remove a tiny piece of the liver to send to the laboratory for further tests (a liver biopsy). The surgeon will carry out the operation called the Kasai operation. During the operation the gallbladder and all the abnormal bile ducts outside the liver are removed. At the highest point, along the surface of the liver, there are usually enough very small bile ducts which will allow some bile flow to be re-established. The surgeon will join a loop of intestine to the under surface of the liver.

How long will the operation last?

The operation will last a whole morning or afternoon. Putting your baby to sleep, inserting lines (tubes) so that your child can have fluids through their vein, giving your child pain management and then waiting for your baby to wake up will take longer. The doctor responsible for putting your child to sleep (the anaesthetist) can explain the kind of lines they will insert to monitor your child and to give them medications or blood products after the operation.

Immediately after the Kasai operation

You will be able to collect your child from the operation recovery area.

There will be a tube running through your baby’s nose down into the stomach. This is called a naso-gastric tube. This usually drains into a clear bag and keeps the stomach empty which helps to prevent sickness. It is important to keep your baby’s stomach empty for 48-72 hours until the feeds are commenced. You will not be able to feed your baby for a couple of days. This is because the surgeon operates on the bowel which stops it from working for a short time. There is a danger of leakage from the point where the bile ducts have been joined to the bowel if the feeds are started too early. The bowel recovers within a couple of days and feeding can resume. Until then your baby will be fed through an intravenous drip.

Intravenous Drips: A central line will be placed into one of the bigger blood vessels in the neck at the time of the surgery. It will be used to provide fluids, medication including pain relief, antibiotics and blood products. It will be taken out when these are no longer needed. Fluids are given in order to keep the sugar, salt and water levels at the right level in the body. Blood tests will be carried out to check these levels so that they can be changed if needed. All fluids required by your baby will be given through the drip until feeding is re-started.

Pain relieving drugs: These are often given nonstop via the central line or a cannula (a tube inserted into a vein). A special pump controls the rate and amount of the drug given. Sometimes pain relief is given through a small tube inserted into a baby’s back at the time of the operation. This is similar to those used for women in labour. This is called an “epidural catheter”. Pain relief will be discussed with you.

Antibiotics: Your baby will receive antibiotics through a vein (intravenously) for three to five days after surgery.

Urinary catheter: Your child will have a urinary catheter which will drain urine from the bladder. This is to ensure their urine output is measured accurately to check how well the kidneys are working.

Abdominal drain: An abdominal drain will be placed during surgery to drain excess blood and fluid from around the liver. This will be removed as the drainage decreases. A dressing may cover the wound on your baby’s tummy for the first few days. The dressing will be changed as needed. The stitches do not need to be removed as they will dissolve after the wound has healed. It will be possible for you to hold your baby the day following the surgery, the nurse will help you.

When will my baby be able to leave hospital and what happens next?

If there are no problems after the surgery then your baby will be allowed to go home, usually around seven to ten days after the operation, once you and the medical team are happy with your baby’s condition. Before going home the clinical staff will make sure that the wound is healing and there is no suggestion of infection anywhere in the body. You will be given or sent an outpatient appointment. Before your baby leaves the hospital you will be given an initial supply of medicines and feeds. More will be arranged through your GP.

It is quite common for the hospital staff to advise your health visitor, GP and local hospital about your child’s condition and any special care which is needed so that they can offer you useful support when you are at home. Your Clinical Nurse Specialist (CNS) will stay in touch with you and you will be able to ring them whenever necessary so you are not alone. Once your child can leave the hospital they will require long term follow-up by the doctors, specialist nurses and dietitians.

What options are there for feeding my baby after the operation?

If your baby was being breast fed before you found out they had biliary atresia it may be possible to start breast feeding again, normally alongside other formula feeds. It is important that your milk has been maintained by “expressing” milk while your baby is unable to feed. The nursing staff will help and advise you with this.

Most babies with biliary atresia are unable to gain enough weight on breast milk alone. Your baby might need special milk formula. There are a number of special milks for babies suffering from liver disease. These milks have fats which are more easily digested by babies with liver disease. Powders can be added to the formula to increase the number of calories given to your child. This will make sure your child can gain weight. If this is needed a dietitian will tell you how to combine breast and bottle-feeding. The doctor will prescribe extra vitamins for your baby. This is because babies with prolonged jaundice also have problems absorbing certain vitamins.

What should I do when I am back at home with my baby?

When you get home you should try and treat your baby as normally as possible. Obviously you will be worried at times and this is quite normal. Babies with biliary atresia get common illnesses just like any other baby. Symptoms for which you should seek advice from your GP or hospital are:

  • A raised temperature of 37.8ºC or more, or non-specific illness with a raised temperature
  • More jaundice with paler stools and darker urine
  • The child is generally unwell

If you have any queries regarding your child, please do not hesitate to contact your Clinical Nurse Specialist at the liver unit treating your child.

What medicines may my baby need and why are they given?

The medicines required will depend upon your child’s condition and progress as well as the liver unit you are at. The medical team will help you to understand which medicines your baby will need to take and when. It is important to note that some medicines are not available straight away at pharmacies. You may need to order them from the pharmacy two to three days in advance.

Some commonly used medicines are:

Antibiotics: After the operation antibiotics are given by a drip at first and then by mouth. They are used to reduce the risk of infection in the bile ducts (cholangitis). Further antibiotics may be given as needed.

Vitamins: Additional vitamins are necessary because poor bile flow can reduce the absorption of vitamins.

Phenobarbital: This may be given to increase the flow of bile. As it may make your baby sleepy at first, it is usually given as a single dose, in the evening.

Urso (Ursodeoxycholic acid): This drug is given after restarting feeding after the Kasai operation. It aims to promote the flow of bile.

Ranitidine: It is common to find stomach irritation after any type of abdominal operation and this drug may be given to help lessen this problem.

Steroids: These are given as oral medicines for 4-6 weeks after surgery to reduce inflammation and promote bile flow.

Occasionally the medical team will need to use the following medicines:

Spironolactone: This may need to be given to help your baby get rid of extra fluid which otherwise collects in the abdomen and is called “ascites”. It is not needed in all cases.

If your child needs medicine to reduce a high temperature please use paracetamol (panadol/calpol etc.). Remember aspirin, ibuprofen and other drugs containing aspirin and ibuprofen (calprofen/nurofen) must not be given. Please make sure all medicines are stored correctly and in a safe place. Your child’s medication and dosage will be reviewed at clinic appointments.

How is it possible to tell if the operation has been successful?

At the time of the operation the surgeon will not be able to tell if the Kasai operation has been successful. The first stools after the operation are usually very dark and will then become paler. If the operation is a success and bile drainage does occur the stools gradually change to a yellow/green/brown colour and later the urine becomes paler. The colour of the stools will be checked whilst your baby is in hospital. It is not unusual for there to be difference in the colour of the stools and every baby is different.

If bile drainage is established the jaundice gradually fades. Blood tests will show that bilirubin levels, which cause jaundice, drop towards a normal level. Most babies who clear jaundice after a Kasai procedure do so in two to three months after surgery. It is not unusual for liver function tests to remain abnormal even if the jaundice completely clears. Even if the jaundice clears after a Kasai operation some children will develop complications due to liver damage. Therefore, all children should continue to be seen for regular check-ups.

Of those babies who clear their jaundice some will achieve completely normal liver function and may never experience any further problems. Children who clear their jaundice but have persistently abnormal liver function tests may develop treatable problems such as portal hypertension or deteriorating liver function eventually. These can lead to liver transplantation. Many children who undergo a successful Kasai will be well with their own liver ten years later.