TY - CHAP M1 - Book, Section TI - ABO Incompatibility A1 - Gomella, Tricia Lacy A1 - Cunningham, M. Douglas A1 - Eyal, Fabien G. A1 - Tuttle, Deborah J. PY - 2013 T2 - Neonatology: Management, Procedures, On-Call Problems, Diseases, and Drugs, 7e AB - Isoimmune hemolytic anemia may result when ABO incompatibility occurs between the mother and the newborn infant. This disorder is most common with blood type A or B infants born to type O mothers. The hemolytic process begins in utero and is the result of active placental transport of maternal isoantibody. In type O mothers, isoantibody is predominantly 7S-IgG (immunoglobulin G) and is capable of crossing the placental membranes. Because of its larger size, the mostly 19S-IgM (immunoglobulin M) isoantibody found in type A or type B mothers cannot cross. Symptomatic clinical disease, which usually does not present until after birth, is a compensated mild hemolytic anemia with reticulocytosis, microspherocytosis, and early-onset unconjugated hyperbilirubinemia. SN - PB - McGraw-Hill Education CY - New York, NY Y2 - 2024/03/19 UR - accesspediatrics.mhmedical.com/content.aspx?aid=1107528079 ER -