Biliary AtresiaBiliary Atresia Study in Infants and Children

Inclusion Criteria:

1. Participants need to have a confirmed diagnosis of BA determined by chart review including review of pertinent diagnostic biopsy reports, radiologic reports and surgical reports (if surgery was performed).
2. Participants need to be >6 months of age up to and equal to the age of 20 (participants enrolled at 20 years of age will have one visit).
3. Participants with their native liver.
4. Parent, guardian or participant (if 18 years of age or older) is willing to provide informed consent and, when appropriate, the participant is willing to assent.

Exclusion Criteria:

1. Currently participating in the ChiLDReN study PROBE.
2. Inability to confirm original diagnostic evaluation of biliary atresia.
3. Inability or unwillingness of family or participant to participate in all scheduled visits.
4. History of liver transplantation.