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OverviewAetiologyPathophysiologyClinical features and red flagsInvestigationsDifferential diagnosisManagementComplicationsMonitoring and follow-upSpecial situationsCommon pitfallsQuestionsSources
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Educational draft · awaiting clinical reviewThe full textbook explains uncertainty but does not replace live national or local guidance, specialist advice, or current prescribing information.

Biliary atresia and prolonged neonatal jaundice

Paediatrics and child health · UK scope · Sources checked 27 Aug 2026 · Clinical review pending

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Cholestasis with acute deterioration

Bleeding, sepsis, hypoglycaemia, encephalopathy, tense ascites or cardiovascular instability in a jaundiced infant indicates urgent hepatic or systemic decompensation.

Action: Use ABCDE, check glucose and coagulation, give parenteral vitamin K when deficiency bleeding is possible under paediatric guidance and involve a specialist paediatric liver centre urgently.

Overview

Distinguish unconjugated transitional jaundice from cholestasis, identify pale stool and dark urine early and accelerate specialist investigation of biliary atresia while protecting nutrition and fat-soluble vitamins.

At the two-week check and every contact, ask whether jaundice persists and inspect the sclera and skin in good light, but do not estimate concentration visually. Establish gestation, feeding, weight, urine and stool colour, bruising, fever and newborn screening. Examine hydration, growth, liver, spleen, abdomen and dysmorphism. A photo of stool can help, but colour-card comparison and direct clinical action are preferable to verbal terms such as light brown.

NICE thresholds trigger investigation rather than diagnosis. In a term infant jaundiced beyond fourteen days, or preterm infant beyond twenty-one, look for pale stool and dark urine and measure fractionated bilirubin. Obtain FBC, maternal and infant groups and DAT, consider urine culture when infection is suspected and confirm metabolic screening including congenital hypothyroidism. Conjugated bilirubin over 25 micromol/L needs expert advice.

Aetiology

01

Biliary atresia

Progressive fibro-inflammatory obliteration of extrahepatic and intrahepatic bile ducts develops around birth and blocks bile drainage.

02

Infectious or metabolic cholestasis

Sepsis, UTI, galactosaemia, tyrosinaemia, alpha-1 antitrypsin deficiency and endocrine disease can all produce conjugated neonatal jaundice.

03

Structural obstruction

Choledochal cyst, inspissated bile and other anatomical lesions obstruct extrahepatic flow and may be visible on specialist ultrasound.

04

Unconjugated prolonged jaundice

Breast-milk jaundice, haemolysis, hypothyroidism and increased enterohepatic circulation usually raise unconjugated rather than direct serum bilirubin.

Pathophysiology

  1. 1
    Obstructed bile flow

    Duct injury prevents conjugated bilirubin and bile acids entering intestine, producing dark urine and absent stool pigment.

  2. 2
    Fibrosis progression

    Retained bile and inflammation rapidly scar portal tracts, leading to cirrhosis and portal hypertension if drainage is not restored.

  3. 3
    Fat malabsorption

    Lack of intestinal bile impairs micelle formation and absorption of fat, energy and vitamins A, D, E and K.

  4. 4
    Coagulation vulnerability

    Vitamin K malabsorption reduces clotting-factor activation, causing bruising or intracranial and gastrointestinal bleeding despite a well early appearance.

Clinical features and red flags

Acholic stool

White, chalky, putty or very pale stool reflects absent intestinal bile pigment and requires urgent cholestasis assessment.

Dark staining urine

Water-soluble conjugated bilirubin passes into urine and stains the nappy, unlike isolated unconjugated breast-milk jaundice.

Early well appearance

An infant with biliary atresia may feed and look comfortable initially despite ongoing duct destruction and fibrosis.

Cholestatic liver findings

Hepatomegaly, raised direct bilirubin and GGT with poor growth support obstructed or hepatocellular bile flow.

Vitamin K bleeding

Bruising, mucosal bleeding, melaena or neurological deterioration can reflect severe coagulopathy from fat-soluble vitamin malabsorption.

Red flags requiring action

  • Jaundice lasting beyond 14 days in a term baby or 21 days in a preterm baby requires prolonged-jaundice assessment.
  • Pale chalky or white stool and dark urine that stains the nappy indicates conjugated cholestasis until proved otherwise.
  • Any conjugated bilirubin above 25 micromol/L warrants expert advice under NICE, regardless of total bilirubin appearance.
  • Poor feeding, faltering growth, hepatosplenomegaly, bleeding or bruising strengthens concern for significant liver or metabolic disease.

Investigations

  1. 01
    First-line fractionated serum bilirubinFirst stepFirst line
    Why
    Distinguish conjugated cholestasis from predominantly unconjugated prolonged jaundice.
    Interpretation and limitations
    Direct bilirubin above 25 micromol/L requires expert advice; any convincing pale stool accelerates referral.
  2. 02
    NICE prolonged-jaundice screen
    Why
    Assess FBC, blood groups, DAT, suspected UTI and completion of newborn metabolic screening.
    Interpretation and limitations
    These identify haemolysis, anaemia, infection and endocrine disease but do not replace direct bilirubin.
  3. 03
    Specialist liver and coagulation profile
    Why
    Assess hepatocellular injury, cholestasis, synthetic function, glucose and urgent vitamin-K-related bleeding risk.
    Interpretation and limitations
    INR that fails to correct appropriately raises synthetic failure concern and needs liver-centre management.
  4. 04
    Expert hepatobiliary ultrasound
    Why
    Assess gallbladder, ducts, liver, spleen, vessels and structural lesions such as choledochal cyst.
    Interpretation and limitations
    Supportive findings guide the pathway, but a reportedly normal scan cannot independently exclude biliary atresia.

Differential diagnosis

01

Breast milk jaundice

A thriving breastfed infant can have prolonged unconjugated bilirubin but should still pass pigmented stool and have non-staining urine.

02

Haemolysis

Anaemia, reticulocytosis, blood-group incompatibility or enzyme deficiency raises unconjugated bilirubin and produces a distinct laboratory pattern.

03

Neonatal hepatitis

Infectious, genetic and idiopathic hepatocellular disease can cause conjugated jaundice with hepatomegaly, pale stool and impaired growth.

04

Congenital hypothyroidism

Prolonged jaundice with feeding difficulty, hypotonia or constipation requires confirmation that newborn metabolic screening was completed.

05

Urinary infection

UTI may cause prolonged jaundice with nonspecific symptoms and requires a correctly collected culture when clinically suspected.

Management

01ScreenFractionate prolonged jaundiceFirst stepJaundice persists beyond the gestation-specific NICE threshold.+
  1. 1Inspect stool and urine and examine growth, liver, spleen and systemic state.
  2. 2Measure conjugated bilirubin, FBC, groups and DAT, assess UTI and confirm metabolic screening.
  3. 3Seek expert advice for direct bilirubin above twenty-five or immediately for pale stool or clinical deterioration.
02CholestasisAccelerate liver-centre diagnosisConjugated bilirubin is raised or stool and urine indicate obstructed bile flow.+
  1. 1Contact paediatric gastroenterology or the regional liver centre without sequential primary-care delay.
  2. 2Assess liver, coagulation, glucose, infectious, metabolic and nutritional status.
  3. 3Use expert ultrasound and specialist biopsy or cholangiography to distinguish biliary atresia from other causes.

Complications

01

Cirrhosis and portal hypertension

Continuing obstruction causes fibrosis, splenomegaly, ascites and variceal bleeding even after partially successful initial surgical drainage.

02

Fat-soluble vitamin deficiency

Vitamin K bleeding, vitamin D bone disease, vitamin A visual harm and vitamin E neurological injury can develop rapidly.

03

Growth failure

Fat malabsorption, increased metabolic need and feeding difficulty impair weight and length during a period of rapid growth.

04

Liver transplantation

Failed bile drainage or progressive cirrhosis may require liver transplantation despite timely Kasai portoenterostomy and specialist medical care.

Monitoring and follow-up

  • Review stool colour, urine staining, bilirubin and liver profile through the specialist plan.
  • Plot weight and length frequently and adjust energy and fat formulation with paediatric dietetics.
  • Monitor INR and measured vitamins A, D and E and replace through liver-centre regimens.
  • After Kasai, assess fever and pale stool urgently for ascending cholangitis or loss of drainage.
  • Track spleen size, platelets, ascites and gastrointestinal bleeding for portal hypertension.
  • Coordinate vaccination, transplant assessment and family psychosocial support as disease evolves.

Special situations

Stool colour beats apparent wellness

Visible acholic stool can reveal biliary atresia before growth, behaviour or liver synthetic function deteriorates.

Direct bilirubin changes the pathway

Breast-milk jaundice is unconjugated, so a raised conjugated fraction cannot be dismissed because breastfeeding is going well.

Ultrasound is not an exclusion test

Biliary atresia may lack a single definitive sonographic sign and needs specialist integrated diagnosis.

Kasai is time sensitive

Progressive fibrosis means referral speed matters even though surgery timing is decided by the liver centre.

Common pitfalls

  1. 01

    Calling persistent jaundice breast-milk jaundice without measuring the conjugated fraction.

  2. 02

    Asking only whether stool is yellow rather than checking for pale chalky colour.

  3. 03

    Waiting for a sick appearance before referring cholestasis.

  4. 04

    Using normal ultrasound to exclude biliary atresia.

  5. 05

    Forgetting coagulation and vitamin K risk.

  6. 06

    Delaying referral while repeating bilirubin in routine primary care.

Practice

Two practice questions

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Question 1 of 2
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Paediatrics and child healthOriginal SBA

Prolonged term jaundice

A thriving term infant remains jaundiced at 16 days. What initial assessment is required under NICE even though feeding is going well?

Choose one answer, then submit
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Sources and review status4 sources · checked 27 Aug 2026 · clinical review pending+
Sources

Sources and review status

National guidance is shown before implementation-dependent detail. Apply principles in context and verify current guidance when a decision affects care. Source check completed 27 Aug 2026; clinical approval remains outstanding.

  • NICE CG98 Neonatal Jaundice RecommendationsProlonged-jaundice thresholds, direct bilirubin and initial investigations.
  • NHS Newborn Jaundice OverviewRecognition, urgent symptoms and parent advice.
  • CLDF Biliary Atresia InformationPale stool, specialist diagnosis, Kasai surgery and transplantation.
  • Children Liver Disease Foundation Yellow AlertUK early recognition resources for prolonged jaundice and stool colour.

Editorial contact: Doctor’s Passport editorial team. Source-check date is separate from clinical approval. Report a content problem · Content changes

Authoring stateComplete draftClinical stateAwaiting reviewJurisdictionUnited Kingdom
Biliary atresia cannot wait for routine outpatient progression. Contact paediatric gastroenterology or the regional liver service promptly when direct bilirubin is raised or stool is pale. Specialist tests include ALT, AST, GGT, alkaline phosphatase, albumin, glucose, INR, infection and metabolic testing and expert ultrasound. Ultrasound may show gallbladder or hilar abnormalities but cannot alone exclude disease. Liver biopsy and operative cholangiography may establish anatomy when needed.

The Kasai portoenterostomy connects a Roux jejunal limb to microscopic bile channels at the liver hilum after removing fibrotic duct remnants. Outcome declines as fibrosis advances, making early referral crucial rather than waiting for the infant to become unwell. After surgery, monitor stool pigmentation, bilirubin, cholangitis, nutrition and portal hypertension. Many children eventually need transplantation, but timely Kasai can preserve native-liver function for years.

Nutrition is active therapy. Use specialist dietetic input for increased energy needs, medium-chain-triglyceride-containing feeds when indicated and measured vitamins A, D, E and K. Vitamin K deficiency bleeding can be catastrophic, so unexplained bruising or bleeding needs emergency coagulation assessment and parenteral replacement. Continue ordinary parent-infant feeding support and explain that neither breastfeeding nor parental action caused the obstruction.

Key points

  • Prolonged jaundice means more than 14 days at 37 weeks gestation or above, and more than 21 days below 37 weeks.
  • Ask parents to describe or show stool and urine directly; pale chalky stool and dark staining urine are the highest-yield cholestasis clues.
  • First-line tests under NICE are conjugated bilirubin, FBC, maternal and infant blood groups and DAT, with urine culture when UTI is suspected and confirmation of newborn metabolic screening.
  • Conjugated bilirubin above 25 micromol/L needs expert advice because it may indicate serious liver disease.
  • Do not stop breastfeeding merely to test breast-milk jaundice and do not use visual bilirubin assessment alone.
  • Suspected biliary atresia needs same-day discussion with paediatric gastroenterology or a specialist liver centre; early investigation preserves the chance of effective Kasai surgery.
  • Specialist evaluation uses liver tests, coagulation, glucose, infection and metabolic studies, expert ultrasound and sometimes biopsy or operative cholangiography.
  • Kasai portoenterostomy removes fibrotic extrahepatic remnants and drains bile through a jejunal loop; earlier surgery generally offers better native-liver drainage.
  • Cholestatic infants need high-energy feeding, specialist fat formulation and measured supplementation of vitamins A, D, E and K, with ongoing monitoring.
Fever, lethargy, irritability or reduced urine can indicate UTI or sepsis causing or accompanying jaundice.
  • Do not reassure from breastfeeding or a well appearance when stool is pale; biliary atresia can initially coexist with apparently good health.
    • 05
    Liver biopsy and operative cholangiography
    Why
    Define histology and duct patency when non-invasive assessment cannot establish diagnosis.
    Interpretation and limitations
    Cholangiography directly demonstrates absent extrahepatic drainage and can proceed to Kasai in the surgical pathway.
    03Biliary atresiaRestore drainage and protect nutritionSpecialist assessment confirms or strongly supports biliary atresia.+
    1. 1Proceed to timely Kasai portoenterostomy through the paediatric hepatobiliary team.
    2. 2Provide high-energy dietetic care and monitored fat-soluble vitamin replacement.
    3. 3Track bile drainage, cholangitis, growth, portal hypertension and transplant need long term.