<prompt> In neonatal cholestasis, if the serum gamma glutamyl transpeptidase GGT is more than 600 IUL, the most likely diagnosis is:Neonatal hepatitisCholedochal cystSclerosing cholangitisBiliary atresia  <response>: 3 Enzymes reflect cholestasis: Alkaline phosphatase, 5nucleotidase Gamma glutamyl transpeptidase. About GGT in Cholestasis: Normal value of GGT is 5-40 IUL GGT levels are commonly elevated to values more than 10 times normal in biliary atresia while in hepatic causes it is raised to about three times normal Value of 600 IUL in the patient- elevation of more than ten times the normal value: biliary atresia. 