Cervical Length Measurement by Transvaginal Sonography in Preterm Pregnant Women for Prediction of Preterm Birth
Sujira Kwasan MD*, Rita Paisarntuntiwong MD*, Paiboon Charoenchainont MD*
Affiliation : * Department of Obstetrics and Gynecology, Bangkok Metropolitan Administration (BMA) Medical College and Vajira Hospital
Objective : To determine the optimal value of cervical length and the presence of funneling in women with
preterm labor to predict preterm delivery.
Materials and Methods : Transvaginal sonography to determine cervical length and presence of funneling in 69
pregnant women with gestational age between 24 – 36 weeks who had preterm labor and were admitted to the
labor room of BMA Medical College and Vajira Hospital.
Results : The cervical length of women with preterm labor ranged between 10.7–61.2 mm (mean + SD = 30.1
+ 9.9 mm). The prevalence of preterm delivery was 43.4 %. The cervical length of 30 mm had the highest
diagnostic performances in predicting preterm delivery, with the sensitivity 93.3 %, specificity 82.0 %. About
90% of women with funneling presence had preterm delivery.
Conclusion : The cervical length and presence of funneling in preterm labor women are significantly associated
with preterm delivery.
Keywords : Preterm labor, Preterm delivery, Cervical length, Funneling, Transvaginal sonography
