Maternal IgG anti-A and anti-B titres predict outcome in ABO-incompatibility in the neonate.
OBJECTIVE
To evaluate predictors for risk of severe hyperbilirubinaemia and kernicterus in ABO-incompatible neonates with emphasize on maternal IgG anti-A/-B titres.


METHODS
Blood group O women in labour at Oslo University Hospital, Ullevål, were included in the years 2004-2006. Offspring with blood group A or B had direct antiglobulin test performed and IgG anti-A/-B levels measured in maternal plasma. Blood group A or B infants developing severe hyperbilirubinaemia, received in addition to phototherapy, immunoglobulin treatment and/or exchange transfusion (EXT).


RESULTS
Of 253 neonates, 61.3% had blood group O, 29.6% blood group A and 9.1% blood group B. Twenty neonates with blood group A or B received at least one immunoglobulin treatment. In multivariate analysis, maternal antibody-titres were the only significant predictors for immunoglobulin treatment (p < 0.0001), EXTs (p < 0.05) and duration of phototherapy (p < 0.0001). The need for invasive treatment increased sharply for antibody titres > or =512. Receiver operating characteristic analyses demonstrated that titres > or =512 had a sensitivity of 90% and a specificity of 72% for predicting immunoglobulin treatment and thus severe hyperbilirubinaemia.


CONCLUSIONS
Maternal IgG anti-A/-B titres contribute to the prediction of risk of severe hyperbilirubinaemia in ABO-incompatible neonates, in addition to blood-grouping and direct antiglobulin-testing, especially following early discharge after delivery.
Bakkeheim
Egil
E
Department of Paediatrics, Oslo University Hospital, Ullevål, Oslo, Norway. egil.bakkeheim@uus.no
Bergerud
Unni
U
Schmidt-Melbye
Anne-Christine
AC
Akkök
Ciğdem Akalin
CA
Liestøl
Knut
K
Fugelseth
Drude
D
Lindemann
Rolf
R
D000017:ABO Blood-Group System / Q000276:immunology*; D000888:Antibodies, Anti-Idiotypic / Q000097:blood*; D001787:Blood Group Incompatibility; D005260:Female; D006801:Humans; D051556:Hyperbilirubinemia, Neonatal / Q000276:immunology* / Q000628:therapy; D007074:Immunoglobulin G / Q000097:blood*; D007231:Infant, Newborn; D015999:Multivariate Analysis; D011237:Predictive Value of Tests; D011247:Pregnancy; D011446:Prospective Studies; D012307:Risk Factors; D012680:Sensitivity and Specificity; D012720:Severity of Illness Index
D000017:ABO Blood-Group System; D000888:Antibodies, Anti-Idiotypic; D007074:Immunoglobulin G