Revisiting ABO incompatibility as a risk factor for significant neonatal hyperbilirubinemia

Area of Science:

• Neonatal Medicine
• Pediatrics
• Hematology

Background:

• ABO incompatibility is a common cause of neonatal jaundice.
• Current practices often involve frequent biochemical screening and extended hospital stays for affected infants.

Purpose of the Study:

• To compare serum bilirubin levels at 48 and 96 hours of age in neonates with and without ABO incompatibility.
• To evaluate the necessity of prolonged hospitalization for neonates with ABO incompatibility.

Main Methods:

• Prospective study of 184 neonates (≥34 weeks gestation), divided into groups with and without ABO incompatibility (92 each).
• Direct Coombs test performed on cord blood.
• Serum bilirubin, hematocrit, and reticulocyte counts were measured at 48 and 96 hours.

Main Results:

• Mean serum bilirubin and hematocrit levels were comparable between groups at 48 and 96 hours.
• Mean reticulocyte count was significantly higher in neonates with ABO incompatibility.
• No increased risk of significant hyperbilirubinemia observed in neonates with ABO incompatibility.

Conclusions:

• Late preterm and term neonates with and without ABO incompatibility exhibit similar bilirubin levels.
• Prolonged hospitalization for neonates with ABO incompatibility is likely unnecessary.
• Routine biochemical screening frequency may be re-evaluated for these infants.