Background: Induction of labor (IOL) is a common obstetrical procedure. Bishop's score was the single
predictor element used by practitioners to assess the risk of failure, which led to an increase in cesarean sections (CS).
Ultrasound (US) examination was proposed since the variability limitations of Bishop score warranted alternative
Objective: This study verifies how the US and other maternal parameters are used in the transperineal approach as an
indication and as a predictor of successful induction.
Material and methods: A prospective clinical study of 100 participants with term singleton pregnancy referred for IOL
and who fit the criteria of this study. Their maternal parameters and fetal head to perineum distance (HPD), measured by
the transperineal US, were calculated before the induction. After the induction, the patients were stratified into two
groups, which are vaginal delivery (68%) and CS (32%). The estimated time interval to delivery was also recorded.
Results: None of the maternal parameters was significant; the P-values of maternal age, parity, body mass index (BMI),
gestational age, and weight of the fetus is 0.75, 0.75, 0.69, 0.81, and 0.81, respectively. One-way ANOVA test estimated
the most significant factors for inducing labor. Fetal HPD and induction to delivery interval were remarkably significant
in both groups <0.0001.
Conclusion: The shorter the HPD (<47.65±1.66 mm), the higher the possibility of vaginal delivery and a shorter delivery
interval. By contrast, the longer HPD (>52.56±1.93mm), the lower the possibility of vaginal delivery and a longer
delivery interval. These promising results may serve as a valuable tool in predicting a mode of delivery.