Pediatrics In neonatal cholestasis, if the serum gamaglutamyl-transpeptidase (gamma GTP) is more than 600IU/L the most likely diagnosis is: A Neonatal hepatitis B Choledochal cyst C Sclerosing cholangitis D Biliary atresia 💡 Explanation In neonatal cholestasis, if the serum gamaglutamyl-transpeptidase (gamma GTP) is more than 600IU/L the most likely diagnosis is: ✓ Correct Answer: D. Biliary atresia