IMR Press / CEOG / Volume 36 / Issue 1 / pii/1630635164111-207363605

Clinical and Experimental Obstetrics & Gynecology (CEOG) is published by IMR Press from Volume 46 Issue 1 (2019). Previous articles were published by another publisher on a subscription basis, and they are hosted by IMR Press on as a courtesy and upon agreement with S.O.G.

Open Access Original Research
Transvaginal sonography of cervical length and Bishop score as predictors of successful induction of term labor: the effect of parity
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1 Department of Obstetrics & Gynecology, University of Malaya, Kuala Lumpur
2 Department Social and Preventative Medicine, University of Malaya, Kuala Lumpur (Malaysia)
Clin. Exp. Obstet. Gynecol. 2009, 36(1), 35–39;
Published: 10 March 2009

Objective: To evaluate the predictive value for successful labor induction of transvaginal ultrasound (TVS) of cervical length according to parity. Method: TVS of the cervix was performed before term labor induction. Induction was considered successful if vaginal delivery was achieved within 24 hours; 231 women were available for final analysis. Results: Analysis of the receiver operator characteristics curve showed an optimal cut-off for cervical length of ≤20 mm for successful induction. Following multivariate logistic regression analysis, a sonographic short cervix (AOR 5.6; p < 0.001) was an independent predictor of successful induction but not a favorable Bishop score (p = 0.47). Among multiparas with a short cervix, positive and negative predictive values for successful induction were 98% (95% CI 90-100%) and 21% (95% CI 13%-32%) and among nulliparas, predictive values were 69% (95% CI 53%-82%) and 77% (95% CI 64%-87%) respectively. Conclusion: In nulliparas, cervical length can usefully predict labor induction outcome.
Transvaginal ultrasound
Cervical length
Bishop score
Labor induction
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