A cerclage is a procedure that stitches the cervix closed during pregnancy to prevent it from opening too early. It’s most commonly used for women whose cervix begins to shorten or dilate well before their due date, a condition called cervical insufficiency. The goal is straightforward: keep the cervix sealed long enough for the baby to reach a safe gestational age.
Why Some Women Need a Cerclage
During a normal pregnancy, the cervix stays firm and closed until the final weeks, when it gradually softens and opens in preparation for labor. In some women, this process starts months too early, sometimes without any contractions or warning signs. When the cervix shortens or dilates in the second trimester, the risk of preterm birth or pregnancy loss rises sharply.
Cervical insufficiency can result from previous cervical surgeries (such as a LEEP or cone biopsy), trauma during a prior delivery, or a naturally short cervix. Some women only discover the problem after losing a pregnancy in the second trimester. A cerclage acts like a drawstring, physically holding the cervix shut until the pregnancy reaches a safer point.
Three Types Based on Timing
Cerclages fall into three categories depending on when and why they’re placed:
- History-indicated (preventive): Placed around 12 to 14 weeks of pregnancy in women with a known history of cervical insufficiency or prior second-trimester loss. This is the most common type, and the one with the best outcomes. In one large study, elective cerclages had a success rate of 89.2%, defined as delivering a live infant.
- Ultrasound-indicated: Placed when routine ultrasound monitoring reveals that the cervix has shortened significantly, typically before 24 weeks. This is common in women being watched closely because of a previous preterm birth.
- Rescue (emergency): Placed when the cervix has already begun dilating or membranes are bulging through the opening. This carries higher risks. Delaying the procedure into the later second trimester increases the chance of infection by roughly 2.6 times and triples the risk of the membranes rupturing before 32 weeks.
How the Procedure Works
Most cerclages are placed vaginally under regional or general anesthesia. The two main techniques differ in how and where the stitch sits on the cervix.
The more common approach uses a purse-string stitch placed around the outside of the cervix, as high up as possible, then cinched tight to close the opening. The knot is left accessible so the stitch can be easily cut later. The whole procedure typically takes 15 to 30 minutes.
The second vaginal technique involves tucking the stitch beneath the surface tissue of the cervix, burying most of the suture material. This positions the stitch closer to the internal opening and may provide a stronger hold, but it’s harder to remove when the time comes.
Transabdominal Cerclage
For women whose cervix is too short or too scarred for a vaginal stitch to hold, an abdominal cerclage places the suture higher up, around the very top of the cervix, through an abdominal incision or laparoscopy. This is a more involved surgery, but the outcomes are notably better for the right candidates. The rate of delivery before 32 weeks was 8% with a transabdominal cerclage compared to 33% with a standard vaginal cerclage in women who had previously failed a vaginal approach.
Transabdominal cerclage is typically offered to women who’ve had a vaginal cerclage fail (delivering before 28 weeks despite the stitch), or whose cervix has been extensively shortened by repeated surgeries. Because this stitch stays in permanently, delivery is by cesarean section.
What Recovery Looks Like
After a vaginal cerclage, most women go home the same day or the next morning. Mild cramping and light spotting for a few days is normal. Many providers recommend pelvic rest afterward, meaning nothing in the vagina and no sexual intercourse, at least for a period following placement.
Activity restrictions vary by provider. Some recommend reduced physical activity, avoidance of heavy lifting, or modified work duties. However, the medical evidence on this point is surprisingly thin. The Society for Maternal-Fetal Medicine has noted that available data do not demonstrate a clear benefit to routine activity restriction in women at risk of preterm birth, and some studies even suggest that strict bed rest may increase that risk. In practice, your provider will tailor recommendations to your specific situation, but a cerclage alone doesn’t automatically mean weeks on the couch.
Risks and Possible Complications
Cerclage is generally safe, but it does carry real risks. The most significant include infection of the membranes surrounding the baby, premature rupture of the membranes (your water breaking too early), and cervical tearing if labor starts while the stitch is still in place. Bleeding and irritation of the cervix are common but usually minor.
Timing matters for risk. Preventive cerclages placed early in pregnancy have the lowest complication rates. Emergency cerclages placed when the cervix is already dilating carry substantially higher infection and membrane rupture risks, which is why early identification of cervical insufficiency makes a significant difference.
When the Stitch Comes Out
A vaginal cerclage is typically removed around 36 to 37 weeks of pregnancy. Removal is a quick office procedure that usually doesn’t require anesthesia. The stitch is cut and pulled out, and most women feel only brief discomfort. Removing the stitch doesn’t mean labor starts immediately. Some women go into labor within days, while others carry to their due date or beyond.
If preterm labor begins while the cerclage is still in place, the stitch needs to come out promptly to prevent it from tearing through the cervix during contractions.
Success Rates and What Affects Them
Overall, cerclage is effective for the right patients. In a study of primarily elective cerclages, 89.2% resulted in a live birth. But outcomes aren’t uniform across all women.
Age plays a role. Women between 20 and 29 had a 96.6% success rate, while those 40 and older saw that drop to 78.3%. Women who had given birth before also did better: those with one to three prior deliveries had a 94.6% success rate, compared to 78.3% for women in their first pregnancy. About 10.8% of women in the study delivered at or before 28 weeks, highlighting that cerclage reduces but doesn’t eliminate the risk of very early preterm birth.
The strongest predictor of success is whether the cerclage is placed preventively based on a known history, rather than as a rescue after the cervix has already changed. If you’ve been told you need a cerclage, the specific type, timing, and your individual risk factors all shape what you can expect.