Cross sectional area of umbilical cord as a predictor for neonatal birth weight


Background: In an effort to ameliorate the adverse outcomes associated with traumatic delivery, maternity care professionals continue to search for methods of predicting fetal weight accurately. Aim: This study was designed to clarify the relation between cross sectional area of umbilical cord measured by ultrasound and actual birth weight and compare it with that of hadlock's formula. Patients and method This ; prospective cohort study included 113 pregnant women with uncomplicated, singleton pregnancy and gestational age of 37-42 weeks, admitted with early labor or prepared for elective cesarean section. All were examined by ultra sound, during which fetal anthropometric parameters (BPD, FL, and AC) and cross sectional area of umbilical cord were measured. The estimated fetal weight calculated by Hadlock's formula and by cross sectional area of umbilical cord was correlated with actual birth weight. Results: There was a significant moderate correlation between umbilical cross sectional area with, maternal BMI and neonatal gender, gestational age, but there was no correlation with maternal age, height and parity p.( <0,001) . The umbilical cord cross sectional area and Wharton’s jelly area were found to be moderately correlated with neonatal actual birth-weight, and no significant correlation with umbilical vessels area P (<0.001) The correlation strength of the umbilical cord cross sectional with the estimated birth weight was higher than that by Hadlock’s formula with the value of Coefficient of determinant (R2= 0.3828) for umbilical cord area versus (R20.194 ) for Hadlock's. Conclusion: The cross sectional area of umbilical cord was more accurate in predicting birth weight than fetal anthropometric parameters Bi parietal diameter, femur length and abdominal circumference, (BPD, FL,AC)by Hadlock's formula.