ABSTRACT
This study was conducted to explore the value of the transvaginal ultrasonography of the cervical length measurement in comparison with Bishop Score in predicting the mode of delivery in the pregnancies in which labor is induced. A total of 148 pregnancies at 37 to 42 weeks of gestation were included for induction. At first, the cervical length was measured by transvaginal ultrasonograghy and then was compared with Bishop Score to predict the mode of delivery. The cut off points was considered as 27 mm for the former and as score 4 for the latter. Mean preinduction cervical length was 24.5 +/- 7.92 mm. Seventy-three percent of pregnancies were primipara whereas 27% were multipara. Eighty eight women delivered vaginally and 60 underwent cesarean section. In the study, the rate of cesarean in the primipara was more than multipara [P<0.01]. The sensitivity and specificity of the length of the cervix in comparison with Bishop Score were [71.6 vs 53.4%], [45 vs 66.7%] respectively. The cervical length measurement and Bishop Score correctly predicted the model of delivery in 90 cases [60.8%] and 87 cases [58.8%], while the rate of incorrect prediction were 58 cases [39.2%] and 61 cases [42.2%] respectively [P= 0.81]. This study suggested that the cervical length measurement by transvaginal ultrasonograghy with cut-of-point of 27 mm and the Bishop Score of 4 are equally successful in predicting the type of delivery