Relations between second-trimester aneuploidy screening results and prediction of labour induction success in term pregnancies.

We aimed to assess whether the second-trimester maternal serum markers could be used for the prediction of labour induction success. This prospective study enrolled women planned labour induction at term. Women were assigned to one of two groups: vaginal prostaglandin or balloon dilatation. All patients were evaluated for Bishop score, maternal serum oestriol, human chorionic gonadotropin and progesterone at the time of second-aneuploidy screening. The total successful rate for induction of labour was 63.9% in both groups. Maternal serum oestriol multiple of median (MoM) values were significantly lower among the caesarean section group compared to the vaginal delivery group ( < .001). A MoM value of 0.74 for oestriol was associated with a sensitivity of 75.9%, specificity of 41.0%, a positive predictive value of 76.6% and a negative predictive value of 58.0% for a successful induction of labour. Oestriol had a good performance in the prediction of successful induction of labour at term.IMPACT STATEMENT Induction of labour is a common procedure undertaken whenever the benefits of prompt delivery outweigh the risks of expectant management. Previous studies have reported that a decreased progesterone/oestradiol ratio and increased maternal plasma oestriol levels are associated with successful labour. The results of this study showed that second-trimester oestriol multiple of median (MoM) value provide a significant contribution to the efforts of the prediction of successful induction of labour in term pregnancy, having a sensitivity of 69.8%, specificity of 92.4%, positive predictive value of 83.3% and negative predictive value of 82.5%. This finding can be used as an additional method for prediction of labour induction as well as multiparity and Bishop score. This adds new valuable data to the literature which could be used for systematic reviews and for implementing guidelines and protocols on labour induction.