Introduction: In the last few years ultrasonography has become an integral part of antenatal care, playing a central role in accurate pregnancy dating and screening for fetal abnormalities, placenta previa and multiple pregnancy. In the third trimester, ultrasound is used selectively in the diagnosis and management of problems suspected from clinical examination, such as fetal growth restriction, macrosomia, malpresentation and antepartum haemorrhage. In the present study we report the ndings of cervical length at 37 to 41 weeks and the interval of delivery. Aims of the Study: The aims of this study undertaken were as follows: To assess cervical length in the subjects attending antenatal OPD with a singleton gestation with vertex presentation between 37 to 41 weeks, To study the association of time interval of cervical length measurement and onset of labour. Materials and Methodology: The following inclusion criteria were used while selecting the subjects for the study: 1. Singleton pregnancy from 37 to 41 weeks of gestation, 2. Cephalic presentation, 3. Intact membranes, 4. Live fetus 5, Non labouring. Conclusion: CL by transvaginal ultrasound at term in singletons gestations, which is easily performed, could be used for prediction of spontaneous labour. It can be used to estimate the chance that a woman has a spontaneous delivery within 1 week.

Keywords: CL-cervical length; TVS-transvaginal ultrasonography.