title: Change of blood group from A2 to Ax in a child with congenital abnormalities.
abstract: A blood group change from A2 to Ax is described in a boy who had Fallot's tetralogy, oesophageal atresia, and a tracheo-oesophageal fistula. The change of blood group created a transfusion problem. The unusual serology is discussed.
mesh_terms: D000017:ABO Blood-Group System; D000015:Abnormalities, Multiple / Q000097:blood*; D001803:Blood Transfusion; D004933:Esophageal Atresia / Q000097:blood; D006801:Humans; D007223:Infant; D008297:Male; D013771:Tetralogy of Fallot / Q000097:blood; D014138:Tracheoesophageal Fistula / Q000097:blood
chemical_list: D000017:ABO Blood-Group System