Original ArticlePrevalence of elevated liver enzymes in children with cystic fibrosis diagnosed by newborn screen

BackgroundPrevalence and risks for elevated liver enzymes have not been studied systematically in children with CF identified by newborn screen.Methods298 CF children identified by newborn screen since 1982. AST, ALT and GGT tested at annual visits. Percent of children with 1 or ≥ 2 values of elevated AST, ALT and GGT determined. Relationship of liver enzymes to clinical factors or subsequent liver disease was analyzedResultsAt least one abnormal value for AST (63%), ALT (93%) and ALT ≥ 1.5 × ULN (52%) occurred by 21 years of age. Liver enzyme elevations were not correlated with CFTR mutation, meconium ileus or ethnicity. AST and GGT ≥ 1.5 × ULN were associated with later advanced liver disease HR (CI) 6.53 (2.02-21.1) and 4.03 (1.15-13.45), respectively.ConclusionsElevated liver enzymes are common during childhood in CF patients identified by newborn screen. Elevated AST and GGT may be markers for risk of advanced liver disease.