Pediatrics In neonatal cholestasis, if the serum gammaglutamyl transpeptidase is more than 600IU/L the most likely diagnosis is. A Neonatal Hepatitis B Choledochal cyst C Hypothyroidism D Biliary atrisia 💡 Explanation In neonatal cholestasis, if the serum gammaglutamyl transpeptidase is more than 600IU/L the most likely diagnosis is. ✓ Correct Answer: D. Biliary atrisia