The New Cerclage Guideline

The New Cerclage Guideline — ACOG CPG No. 12 Reviewed | Advanced Perinatology

Maternal-Fetal Medicine Guideline Review

The New Cerclage Guideline: What Changes, What Doesn't

ACOG Clinical Practice Guideline No. 12✦September 18, 2026✦Advanced Perinatology

For patients and families

A cerclage is a supportive stitch placed around the cervix to help it stay closed during pregnancy, used when the cervix has shown it may open too early. This month, the American College of Obstetricians and Gynecologists released its first fully updated cerclage guideline in twelve years. Most of it confirms what high-risk pregnancy specialists like our team already do, now backed by stronger evidence. The most important change: for twin pregnancies where the cervix has already begun to open in the second trimester, a cerclage is now clearly recommended, something earlier guidance discouraged.

If you have a history of preterm birth, pregnancy loss in the second trimester, or a short cervix, this guideline is about you, and it is good news: the playbook is clearer than it has ever been. Bring your questions to your next visit.

Twelve years is a long time between editions. ACOG's new Clinical Practice Guideline No. 12 on obstetric cerclage (Obstet Gynecol 2026;148:e194–e212), which replaces the 2014 Practice Bulletin 142 and carries SMFM's endorsement, arrives with formal GRADE ratings, a management algorithm, and one true reversal: examination-indicated cerclage in twins is now a strong recommendation. The rest of the document largely codifies what evidence-driven MFM practice already looks like, which is its own kind of useful; every indication, alternative, and removal decision now has a citable strength and quality rating behind it.

Indications

The three singleton indications hold, with sharper edges

IndicationsConfirms practice

History-indicated cerclage for cervical insufficiency (strong, moderate quality) is placed at 12 0/7–14 6/7 weeks, and deferring in favor of cervical length surveillance from 16 0/7 to 24 0/7 weeks is an explicitly sanctioned pathway: in surveillance cohorts most patients never needed the stitch, with placement rates of 11–47%. Ultrasound-indicated cerclage for singletons with prior spontaneous preterm birth and cervical length below 25 mm at 16 0/7–24 0/7 weeks (strong, moderate quality) carries a number needed to treat of 8 to prevent one spontaneous preterm birth before 35 weeks, with no demonstrated benefit at or beyond 24 weeks. Examination-indicated cerclage for painless dilation without infection or labor earns the guideline's only high-quality indication rating; placement at 2 cm dilation or more was associated with delivery at a median 27 versus 35.6 weeks, an argument for catching dilation early.

Practice impact: Confirms current AP protocols; the surveillance-instead-of-immediate-cerclage pathway and the 24-week ceiling for ultrasound-indicated placement are now formally citable.

In plain termsThe situations where a cerclage helps in a singleton pregnancy are unchanged, but the evidence behind each one is now graded, and watching the cervix with ultrasound instead of placing a stitch right away is an officially endorsed option for many patients.

The reversal: exam-indicated cerclage in twins is now recommended

IndicationsPractice-changing

Where the 2014 bulletin warned cerclage in twins was potentially harmful, the new guideline strongly recommends examination-indicated cerclage for twin gestations with second-trimester dilation and no infection or labor (strong, moderate quality), driven by randomized data showing delivery before 34 weeks at RR 0.71 (95% CI 0.52–0.96) and mean gestational age at delivery of 29.05 versus 22.5 weeks. The counterweight stands: ultrasound-indicated cerclage in twins remains strongly recommended against, on older data suggesting harm (RR 2.15 for delivery before 35 weeks), and prophylactic cerclage solely for twin gestation is not advised.

Practice impact: The one genuine practice change of the guideline. Twin pregnancies with cervical dilation on exam are now cerclage candidates; twin pregnancies with a short cervix alone are not. Worth a protocol note and a word to referring OBs.

In plain termsFor twins, the advice used to be that a cerclage might do more harm than good. New trial evidence changed that: when the cervix has already started to open, a cerclage now clearly helps twins stay in longer.

Alternatives

Progesterone is a peer; the pessary is out

AlternativesConfirms practice

Vaginal progesterone is endorsed as a reasonable alternative to ultrasound-indicated cerclage (strong, moderate quality), with meta-analytic data showing benefit for both interventions and no significant difference between them. The guideline discusses, but pointedly does not recommend, combination therapy, despite cohort data suggesting cerclage plus progesterone versus cerclage alone at RR 0.51 (95% CI 0.37–0.79) for preterm birth before 37 weeks; study quality kept it out of the recommendations. Cervical pessary receives a strong recommendation against, on high-quality evidence.

Practice impact: Shared decision-making between cerclage and vaginal progesterone for the ultrasound-indicated candidate is now the codified standard. Combination therapy remains an individualized call, not a guideline-backed default. Retire any lingering pessary conversations.

In plain termsFor a short cervix after a prior preterm birth, progesterone and a cerclage are both good options, and choosing between them is a conversation with your doctor. The silicone pessary, once a hoped-for third option, does not work and is no longer offered.

Surgical Approach

Technique is the operator's call; transabdominal rescue is codified

SurgicalConfirms practice

No transvaginal technique, suture material, or stitch count is superior: McDonald versus Shirodkar is left to operator experience and anatomy, C-STICH settled monofilament versus braided as equivalent, one stitch is standard with no consistent benefit from two, and reinforcing cerclage should not be performed. The firmest surgical statement is reserved for failure: after one history- or ultrasound-indicated transvaginal cerclage ending in birth before 28 weeks, transabdominal cerclage is strongly recommended on high-quality evidence, anchored by MAVRIC (preterm birth before 32 weeks, 8% versus 33%; RR 0.23), with a minimally invasive approach suggested over laparotomy. Perioperative indomethacin plus cefazolin for exam-indicated cerclage may prolong latency without improving neonatal outcomes (conditional, low quality), and adding azithromycin confers no additional benefit.

Practice impact: Confirms operative flexibility, and gives the transabdominal referral threshold a strong, high-quality citation, useful for counseling patients with a prior failed cerclage and for referring-OB education. No expanded antibiotic prophylaxis beyond cefazolin.

In plain termsThere is no single best way to place the stitch, and your surgeon's judgment matters most. If a vaginal cerclage has failed before, placing the next one through the abdomen, often laparoscopically, is now firmly backed by the strongest evidence in the guideline.

Management After Placement

Less surveillance, individualized PPROM decisions, and a removal window

ManagementConfirms practice

Routine cervical length surveillance after cerclage is suggested against (conditional, low quality): postcerclage measurements predict risk but changing management based on them has not improved outcomes. With PPROM and a cerclage in situ, absent infection or labor, retain-versus-remove is individualized; removal shortens latency (prolongation beyond 48 hours, OR 0.15) while retention raises chorioamnionitis risk (OR 1.78). Removal is suggested at 36 0/7–37 6/7 weeks, permissibly up to 39 6/7 for planned delivery, including removal at scheduled cesarean; after elective removal, mean latency to delivery ran about 13 days, with only 11% delivering within 48 hours.

Practice impact: Supports dropping routine serial cervical lengths after cerclage, standardizes the removal window, and frames the PPROM retain-or-remove conversation as explicit shared decision-making with the tradeoffs quantified.

In plain termsOnce the stitch is in, repeated ultrasound measurements of the cervix usually do not change anything, so we do fewer of them. The stitch typically comes out around 36 to 37 weeks, and delivery usually follows about two weeks later, not right away.

The bottom line for our practiceOne true change: twins with second-trimester dilation are now cerclage candidates, strongly recommended. Everything else is codification with citations: surveillance-first pathways for history-indicated candidates, progesterone as a peer alternative, no pessary, no reinforcing stitches, no routine postcerclage surveillance, transabdominal cerclage after a failed transvaginal one, and removal at 36 to 38 weeks. Our protocols already align; the guideline gives them a spine of graded evidence.

Source: Obstetric Cerclage. Clinical Practice Guideline No. 12. American College of Obstetricians & Gynecologists. Obstet Gynecol 2026;148:e194–e212 (available via ACOG Clinical Guidance) · Replaces Practice Bulletin No. 142 (2014) · Endorsed by the Society for Maternal-Fetal Medicine

Reviewed September 18, 2026 by Advanced Perinatology ♥ Maternal-Fetal Medicine Guideline Review
This review summarizes a published clinical guideline and is not medical advice · Care decisions are always individualized with your physician.

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