Progressive cervical length changes versus single cervical length measurement by transvaginal ultrasound for prediction of preterm delivery.

Background: To evaluate cervical length changes as predictors of preterm delivery.

Methods: Two hundred and fifty-seven pregnant women underwent transvaginal ultrasound examination at 16 and 24 weeks of gestation. Cervical length was measured and the difference between the 2 measurements was calculated.

Comparison of cervical volume and cervical length to predict preterm delivery by transvaginal ultrasound.

The objective of this study was to evaluate predictive value of cervical volume and length measurement for preterm delivery in low-risk pregnancies by transvaginal ultrasound. Two hundred fifty pregnant women were underwent ultrasound examination at 22 weeks of gestation by transvaginal route. Cervical length, width, and anteroposterior diameters were measured and cervical volume was calculated.