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Vaginal Exam for Preterm Labor

Exam Overview

If you have symptoms of preterm labor, your doctor or nurse-midwife may examine you by feeling your cervix. If your contractions continue over a period of hours, you may be examined periodically to see whether your cervix is opening (dilating) or thinning (effacing).

These exams allow your health professional to:

  • Find out how much your cervix has opened and thinned.
  • Find out how far the baby has moved down the birth canal (station).
  • Check for fluid leaking from your vagina using a sterile speculum. If fluid is present, it will be tested to determine whether it is amniotic fluid, which is a sign that your amniotic sac has ruptured.

Why It Is Done

Vaginal exams are done when a pregnant woman has:

  • Uterine contractions that may have changed her cervix and may be preterm labor. The cervix may open and thin without strong or painful contractions.
  • Unusual pelvic pressure or back pain.
  • Vaginal bleeding.

Results

Preterm labor is diagnosed when a woman who is 20 to 37 weeks pregnant has uterine contractions and her cervix has changed, as seen with a vaginal exam.

Preterm labor is not diagnosed if contractions are occurring but the cervix is not becoming thinner or more dilated (open).

What To Think About

When a vaginal exam is not done to assess for preterm labor

When the amniotic membranes rupture early (preterm premature rupture of membranes, or pPROM), sterile speculum exams are kept to a minimum, and digital exams are avoided. This is meant to reduce the risk of infecting the uterus and fetus.

When the placenta is known to be overlapping or covering the cervix (placenta previa), vaginal exams are completely avoided. Disturbing the placenta can trigger bleeding.

Credits

ByHealthwise Staff
Primary Medical ReviewerSarah A. Marshall, MD - Family Medicine
Adam Husney, MD - Family Medicine
Kathleen Romito, MD - Family Medicine
Kirtly Jones, MD - Obstetrics and Gynecology, Reproductive Endocrinology

Current as ofNovember 21, 2017


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