Does cervical length at 13-15 weeks' gestation predict preterm delivery in an unselected population?

Area of Science:

• Obstetrics and Gynecology
• Maternal-Fetal Medicine
• Diagnostic Imaging

Background:

• Spontaneous preterm birth (PTB) remains a leading cause of neonatal morbidity and mortality.
• Early identification of at-risk pregnancies is crucial for timely intervention.
• Cervical length measurement via transvaginal ultrasonography (TVS) is a potential screening tool for PTB.

Purpose of the Study:

• To evaluate the efficacy of mid-trimester cervical length measurement using TVS as a predictor of spontaneous preterm delivery (PTD) in an unselected population.
• To determine if cervical length at 13-15 weeks' gestation correlates with PTD before 37 or 34 weeks.
• To assess the influence of previous obstetric history on cervical length and PTD risk.

Main Methods:

• Prospective screening study involving 2469 asymptomatic Caucasian women with singleton pregnancies.
• Standardized TVS cervical length measurement performed at 13-15 weeks' gestation.
• Exclusion criteria included multiple gestations, iatrogenic PTD, and prior cervical conization. Primary outcomes were spontaneous PTD < 37 and < 34 weeks.

Main Results:

• The overall rate of spontaneous PTD was 1.7% before 37 weeks and 0.2% before 34 weeks.
• Mean cervical length was 44.2 ± 5.4 mm at a mean gestational age of 14 + 2 weeks.
• No significant difference in cervical length was observed between women who delivered at term versus those who delivered preterm. Previous obstetric history did not impact cervical length.

Conclusions:

• Transvaginal ultrasonography cervical length measurement at 14 weeks' gestation is not a reliable screening procedure for predicting spontaneous preterm birth in an unselected population.
• The study did not find cervical length at this gestation to be a useful predictor of PTD.
• Further research may be needed to identify reliable screening methods for spontaneous preterm birth.