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KMID : 0877920100120020060
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Korean Journal of Ultrasound in Obstetrics and Gynocology
2010 Volume.12 No. 2 p.60 ~ p.64
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Ultrasonographic Measurement of Cervical Length in the Prediction of Spontaneous Labor at Term
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Kim Na-Yeon
Chung Shin-Hye
Kim Ji-Yun
Lee Kyung-Ah
Kim Young-Ju
Chun Sun-Hee
Ahn Jung-Ja
Park Mi-Hye
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Abstract
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Objective: To investigate the relationship between cervical length at 36 to 38 weeks of gestation and prediction of spontaneous onset of labor by 41 weeks of gestation.
Methods: We performed transvaginal ultrasound to measure cervical length in women with singleton gestation at 36 to 38 weeks. We used a receiver operating characteristic curve (ROC) to assess the relationship between cervical length and prediction of spontaneous onset of labor by 41weeks by SPSS 6.0.
Results: For the 86 women included in the analysis, the mean cervical length (+/-S.D) was 25.7±1.0 mm. Significant probability of spontaneous labor within 41 weeks of gestation was increased when cervical length was < 20.0 mm. A single cervical length measurement below 30.6 mm between 36 and 38 weeks of gestation predicted spontaneous onset labor before 41 weeks gestation with a sensitivity of 73%, specificity of 92%.
Conclusion: Cervical length measurement at 36-38 weeks of gestation is an independent predictor of delivery by 41 weeks. This information can be utilized when counseling patients regarding the management of term pregnancies.
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KEYWORD
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Cervical length, Spontaneous labor, Term, pregnancy, Transvaginal ultrasound
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