Skip to Content
Home > Your Health > Health and Wellness Library > Cervical Effacement and Dilatation
View Additional Section Content
Effacement and dilatation allow a baby to be born through the birth canal. Effacement means that the cervix stretches and gets thinner. Dilatation means that the cervix opens.
As labor nears,
cervix may start to thin or stretch (efface) and open
(dilate). This prepares the cervix for the baby to pass through the birth canal
(vagina). How fast the cervix thins and opens varies for each woman. In
some women, the cervix may start to efface and dilate slowly over a period of weeks. But a
first-time mother often will not dilate until active labor starts.
Late in your pregnancy, your health professional may check the cervix with his or her fingers to see how much it has effaced and dilated. He or she will wear sterile gloves to do this.
During labor, contractions in your uterus open (dilate) your cervix. They also help move the baby into position to be born.
As the baby's head drops
down into the pelvis, it pushes against the cervix. This causes the cervix to
relax and thin out, or efface.
During pregnancy, your cervix has
been closed and protected by a plug of mucus. When the cervix effaces, the
mucus plug comes loose and passes out of the vagina. The mucus may be tinged
with blood. Passing the mucus plug is called "show" or "bloody show." You may notice when the mucus
plug passes. But you might not.
Effacement is described as a percentage. For
example, if your cervix is not effaced at all, it is 0% effaced. If the cervix
has completely thinned, it is 100% effaced.
After the cervix begins to efface, it
will also start to open. This is called cervical dilatation.
dilatation is described in centimeters from 0 to 10. At 0, the cervix
is closed. At 10, it's completely dilated. Your cervix must be completely dilated before you can start the pushing stage.
Health Tools help you make wise health decisions or take action to improve your health.
ByHealthwise StaffPrimary Medical ReviewerKathleen Romito, MD - Family MedicineAdam Husney, MD - Family MedicineSpecialist Medical ReviewerKirtly Jones, MD - Obstetrics and Gynecology
Current as ofMay 30, 2016
Current as of:
May 30, 2016
Kathleen Romito, MD - Family Medicine & Adam Husney, MD - Family Medicine & Kirtly Jones, MD - Obstetrics and Gynecology
To learn more about Healthwise, visit Healthwise.org.
© 1995-2016 Healthwise, Incorporated. Healthwise, Healthwise for every health decision, and the Healthwise logo are trademarks of Healthwise, Incorporated.
Communicate with your medical team, request medication refills and manage appointments through MUHealthe. Learn More
Schedule an appointment today with an MU Health Care provider.
Our support team is available 24 hours a day, seven days a week at 877-621-8014.
Our interactive Decision Points guide you through making key health decisions by combining medical information with your personal information.
You'll find Decision Points to help you answer questions about:
Get started learning more about your health!
Our Interactive Tools can help you make smart decisions for a healthier life. You'll find personal calculators and tools for health and fitness, lifestyle checkups, and pregnancy.
Feeling under the weather?
Use our interactive symptom checker to evaluate your symptoms and determine appropriate action or treatment.
Copyright ©2017 — Curators of the University of Missouri. All rights reserved. DMCA and other copyright information.
Equal Opportunity/Access/Affirmative Action/Pro Disabled & Veteran Employer. For website information contact the Office of Communications. Disclaimer