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Invited Commentary Serum Gamma Glutamyltransferase Levels in Cholestasis of Infancy Abstract Serum gamma glutamyltransferase (GGT) level in cholestasis of infancy is a complex issue. Experience and caution are required in its interpretation. The common differential lists mentioned in the literatures, including different types of Progressive Familial Intrahepatic Cholestasis and bile acid synthetic disorders, are discussed. Other causes of cholestasis of infancy with normal serum GGT, such as, Smith-Lemli-Opitz Syndrome, Arthrogryposis multiplex congenita, Renal dysfunction and Cholestasis (ARC) Syndrome are also mentioned. Keyword : Bile acid synthetic disorders; Cholestasis; Gamma glutamyltransferase; Infant; Progressive Familial Intrahepatic Cholestasis |