Accuracy of Transvaginal Ultrasound Measured Cervical length and Bishop Score in Predicting Successful Induction of Labor at Term

  • Ayesha Kamran AP Radiology, Sargodha Medical College, DHQ hospital Sargodha
  • Ghulam Mujtaba Nasir Assistant Professor, Community Medicine, Nishtar Medical University, Multan
  • Mohsana Saeed Zia Assistant professor, Gynaecology and obstetrics department Azad Jammu and Kashmir Medical College, Muzaffarabad
  • Zubina Adnan Assistant Professor, Obstetrics and Gynecology Department, AJKMC /CMH Muzaffarabad.
  • Aalia Jadaan Associate professor of Obstetrics & Gynecology, Aziz Fatimah Medical and Dental College and Hospital, Faisalabad.
Keywords: Transvaginal Ultrasound, Cervical Length, Bishop Score, Induction of Labor


Objectives: To assess the accuracy of transvaginal ultrasound measured cervical length and bishop score in predicting successful induction of labor at term.

Methodology:  The study was conducted at Departments of Radiology and Obstetrics & Gynecology, Sargodha Medical College, DHQ hospital Sargodha, in a period of six months from November 2021 to April 2022. After initial cervical assessments and vaginal examination, females were classified as favorable or unfavorable cases based on the bishop score. The researcher herself then performed transvaginal ultrasonography on female subjects. The women's bladders were empty when they were inspected in the dorsal lithotomy position. When the exterior cervical os, cervical canal, and internal cervical os were visible, a sagittal plane through the cervix was detected and cervical length was measured. When a vaginal delivery occurs within 24 hours it was considered as successful induction.

Results: In this study, a total of 131 women were included, of whom 80 (61.07%) had normal vaginal delivery and 51 (38.93%) delivered through caesarean section. The mean age was comparatively (P-value < 0.05) higher in caesarian section group. The mean cervical length was found to be significantly (P-value < 0.05) higher in women who delivered by caesarean section (27.95 ± 7.24 vs. 24.85 ± 7.68 mm) in comparison to normal delivery group. The sensitivity (87.50% vs. 80.0%) and specificity (56.29% vs. 35.29%), Positive Predictive Value (76.09% vs. 65.98%), and Negative Predictive Values (76.09% vs. 65.98%), and Negative Predictive Values (76.09% vs. 65.98%) were comparatively higher on the basis of cervical length (27 mm) in comparison to the bishop score (> 5).

Conclusion: Transvaginal sonography of cervical length is more accurate and objective than the Bishop Score, and it can be used to predict the likelihood that a labour induction would be successful.

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