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Related Experiment Videos

The preterm cervix and preterm labor: relative risks, predictive values, and change over time.

T M Stubbs, J P Van Dorsten, M C Miller

    American Journal of Obstetrics and Gynecology
    |October 1, 1986
    PubMed
    Summary

    Predicting preterm labor is challenging. Early cervical exams in the third trimester can help identify risk, with specific dilation or effacement increasing the likelihood of preterm birth.

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    Area of Science:

    • Obstetrics and Gynecology
    • Maternal-Fetal Medicine
    • Reproductive Health

    Background:

    • Accurate prediction and diagnosis of preterm labor remain significant clinical challenges.
    • A key limitation is the scarcity of cervical data during the early third trimester of pregnancy.

    Purpose of the Study:

    • To investigate the predictive value of cervical examinations in early gestation for preterm labor risk.
    • To assess the utility of serial cervical assessments in identifying patients at risk for preterm birth.

    Main Methods:

    • Conducted 760 prospective, serial, paired, blinded pelvic examinations in 191 low-risk patients between 28 to 34 weeks gestation.
    • Analyzed cervical dilation (internal os ≥ 1 cm) and effacement (≥ 30%) for association with preterm labor.
    • Evaluated changes in cervical status over time.

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    Main Results:

    • Cervical dilation ≥ 1 cm or effacement > 30% increased the relative risk of preterm labor (1.8 to 4.2).
    • Negative predictive values for cervical status exceeded 92%, while positive predictive values were ≤ 18%.
    • Significant changes in cervical status (dilation ≥ 1 cm or effacement ≥ 40%) were uncommon.

    Conclusions:

    • Early cervical examinations, even in low-risk patients, can provide valuable data for preterm labor risk assessment.
    • A baseline late second-trimester examination may aid in the early diagnosis of suspected preterm labor later in gestation.