Biliary Atresia

What is Biliary Atresia?

Biliary atresia is a rare liver disease that affects infants shortly after birth. It happens when the bile ducts, small tubes that carry bile from the liver to the small intestine, become narrow, blocked, or completely absent. Bile is a fluid that helps digest fats and remove waste from the body.

When bile cannot flow properly, it builds up in the liver and causes damage. This buildup leads to elevated levels of bilirubin, a yellow pigment normally removed through bile. Without treatment, the liver becomes scarred and stops working properly. Biliary atresia affects about 1 in 10,000 to 15,000 infants in the United States.

Early detection and treatment are critical for babies with this condition. The disease requires urgent medical attention, usually within the first few months of life. Surgery can help restore bile flow and protect the liver from further damage. Blood tests measuring bilirubin levels are essential tools for identifying this condition quickly.

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Symptoms

  • Jaundice, a yellowing of the skin and whites of the eyes that persists beyond 2 to 3 weeks of age
  • Dark yellow or brown urine that may stain diapers
  • Pale, gray, or white stools instead of the normal yellow or brown color
  • Enlarged liver or spleen that can be felt during a physical exam
  • Poor weight gain or failure to thrive despite feeding
  • Irritability or fussiness beyond normal infant behavior

Jaundice is common in newborns during the first week of life and usually goes away on its own. However, jaundice that lasts beyond 2 weeks or appears alongside pale stools and dark urine may signal biliary atresia. Parents should contact a doctor immediately if these symptoms appear together.

Causes and risk factors

The exact cause of biliary atresia remains unknown in most cases. Researchers believe it may result from a combination of factors including viral infections during or shortly after birth, problems with immune system development, genetic mutations, or issues during liver and bile duct formation in the womb. It is not inherited from parents and does not run in families in most cases.

Some infants with biliary atresia also have other birth defects affecting the heart, spleen, or intestines. This suggests that the condition may develop during early fetal development. The disease is not caused by anything the mother did during pregnancy. It appears to affect girls slightly more often than boys, and certain populations including Asian and African American infants may have higher rates.

How it's diagnosed

Doctors diagnose biliary atresia through a combination of blood tests, imaging studies, and sometimes a liver biopsy. Blood tests measure bilirubin levels, which are significantly elevated in infants with this condition. Direct bilirubin, also called conjugated bilirubin, is particularly high when bile ducts are blocked. Urine tests may show bilirubin in the urine, which should not normally be present.

Additional tests include ultrasound imaging to look at the liver and bile ducts, and a scan called a hepatobiliary iminodiacetic acid scan to check bile flow. A liver biopsy may be needed to examine liver tissue under a microscope. Early diagnosis is critical because surgery is most effective when performed before 2 to 3 months of age. Rite Aid offers blood testing that measures bilirubin levels to help identify liver problems in infants requiring urgent medical attention.

Treatment options

  • Kasai procedure, a surgery that connects the liver directly to the small intestine to restore bile flow
  • Liver transplant if the Kasai procedure does not work or the liver becomes too damaged
  • Medications including ursodeoxycholic acid to improve bile flow and antibiotics to prevent infections
  • Special formulas with medium-chain triglycerides that are easier to digest without normal bile flow
  • Vitamin supplements, especially fat-soluble vitamins A, D, E, and K that require bile for absorption
  • Regular monitoring of liver function, growth, and nutrition by a pediatric liver specialist
  • Treatment of complications such as portal hypertension and bleeding from enlarged veins

Frequently asked questions

Normal newborn jaundice appears in the first few days of life and usually resolves within 1 to 2 weeks. Biliary atresia causes jaundice that persists beyond 2 weeks and is accompanied by pale stools and dark urine. If your baby still looks yellow after 2 weeks or has unusual stool color, contact your doctor immediately.

Biliary atresia requires urgent treatment, ideally before the baby reaches 2 to 3 months of age. The Kasai surgery is most successful when performed early, before significant liver damage occurs. Delays in diagnosis and treatment can lead to permanent liver scarring and the need for a transplant.

Biliary atresia cannot be detected through routine prenatal ultrasounds or testing. The condition develops around the time of birth or shortly after. Diagnosis typically occurs in the first few weeks to months of life when symptoms like prolonged jaundice and pale stools appear.

Doctors measure total and direct bilirubin levels in the blood. Direct bilirubin is significantly elevated in biliary atresia because bile cannot drain properly. Urine tests may show bilirubin in the urine, which is abnormal and indicates bile duct problems. Liver enzyme tests also help assess liver damage.

The Kasai procedure can restore bile flow and delay or prevent the need for liver transplant in many children. However, it is not always a permanent cure. About 60 to 80 percent of infants who have the surgery early will maintain adequate bile drainage for several years, but some will eventually need a liver transplant.

Without treatment, biliary atresia leads to progressive liver damage, scarring, and cirrhosis. The liver eventually stops functioning properly, leading to life-threatening complications. Infants with untreated biliary atresia typically do not survive beyond 2 years of age.

Many children who receive timely treatment can live relatively normal lives with proper medical care. Those who respond well to the Kasai procedure may not need a transplant for many years. Children who receive liver transplants generally have good long-term outcomes and can attend school and participate in most activities.

Bile gives stool its normal brown or yellow color. When bile ducts are blocked, bile cannot reach the intestines. Without bile, stools become pale, gray, or white, resembling clay or putty. This is one of the key warning signs that parents and doctors look for.

Yes, these children often need special formulas containing medium-chain triglycerides that can be absorbed without normal bile flow. They also require supplements of fat-soluble vitamins A, D, E, and K. A pediatric dietitian can help create a nutrition plan to support growth and development.

The condition itself does not recur, but complications can develop after the Kasai procedure. Some children experience ongoing inflammation in the bile ducts or continued liver damage despite successful surgery. Regular monitoring with blood tests and doctor visits is essential to catch and treat any problems early.

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For informational purposes only. Not medical advice.