The maternal fetal blood incompatibility is important in assessing the risk of hyperbilirubinemia in newborns. We analysed the relationship between latencies P I - V and bilirubin levels in 38 full term neonates without maternal fetal blood incompatibility and 42 full term neonates with maternal fetal blood incompatibility.

Latencies P I - V were measured by BERA using monoaural 120 dB click stimuli in Amplied MK 15. Abnormal BERA was defined as latencies P I - V > 5.5 ms. Statistical analysis was performed by Mann-Withney test.

The bilirubin levels of maternal fetal blood incompatibility were 19.77±4.65 mg/dl and without incompatibility were 17.37±4.09 mg/dl. The latencies P I - V in the maternal fetal blood incompatibility were 5.78±1.13 ms.(p=0.014), and without incompatibility 5.15±0.65 ms.(p=0.0030).

The maternal fetal incompatibility prooved to be a collaborating factor for hyperbilirubinemia and prolongation of P I - V.