UGT1A1 and Crigler-Najjar syndrome: Secondly, the collection of umbilical cord blood will provide valuable information otherwise rarely available on possible NH predisposing factors, such as the presence of a UGT1A1 polymorphisms (Gly71Arg and TATA promotor) associated with or without Gilbert’s and/or Crigler-Najjar syndrome [16], or Southeast Asian Ovalocytosis [17, 18].