Cervical Cerclage (Cervical Stitch): Who Needs It and What to Expect

✓ This content has been medically reviewed by an obstetrician and gynaecologist
Written & medically reviewed by: Op. Dr. Ayşet Jane Özcan, Obstetrics & Gynaecology Specialist
Istanbul Faculty of Medicine · Medical Park Bahçelievler · TJOD and TSRM member
Last updated: 15 October 2026 · Last medical review: 15 October 2026

A cervical cerclage — most people call it a cervical stitch — is a strong suture placed around the neck of the womb during pregnancy to give it mechanical support and help it stay closed. It is not part of routine antenatal care and it is not something most pregnant women will ever need. It is offered to a small group whose obstetric history, usually together with cervical measurements on ultrasound, suggests the cervix is at real risk of opening too early and leading to a late miscarriage or a very preterm birth.

If a cerclage has been mentioned to you, it usually marks the beginning of a conversation rather than a decision that has already been made. This article explains what the stitch is, what cervical insufficiency actually means, the three distinct situations in which a cerclage is offered, how and when it is placed, what the anaesthetic involves, what recovery feels like, the risks, how and when the stitch comes out, and the alternatives — vaginal progesterone, cervical length surveillance and the pessary. You will not find success percentages here. The honest answer to "how well does it work?" depends so heavily on which of those three situations applies to you, and on the details of your own history, that a single number would mislead rather than inform.

What a cervical cerclage actually is

A cervical cerclage is a loop of strong, non-absorbable tape or suture placed around the cervix and pulled tight, rather like the drawstring on a bag. It is tied as high up on the cervix as the surgeon can safely reach, and the knot is left with tails long enough to be found and cut later. Because the material does not dissolve, a vaginal cerclage always has to be removed before you give birth.

You may hear several names in clinic, and they describe how the stitch is placed rather than different treatments altogether. A McDonald cerclage is a purse-string suture placed around the cervix at the point where it meets the vagina; it is the most commonly used technique and the easiest to remove. A Shirodkar cerclage is placed a little higher, after the tissue in front of and behind the cervix is pushed back, and the suture is sometimes tucked under the vaginal lining. A transabdominal cerclage is placed through the abdomen rather than the vagina and sits at the very top of the cervix.

It helps to be clear about what the stitch does and does not do. It provides physical support to a cervix that is shortening or opening, and it helps preserve the mucus plug and the natural barrier between the vagina and the pregnancy sac. It does not stop contractions, it does not treat an infection, and it does not address every cause of early birth. Preterm birth is driven by inflammation, infection and biochemical softening of the cervix as much as by mechanical weakness, and a stitch only answers one part of that picture.

Why it is done: cervical insufficiency explained

Cervical cerclage exists to treat cervical insufficiency — a cervix that shortens and opens in the second trimester without the painful, regular contractions of established labour. The older term was "incompetent cervix", which is accurate in a mechanical sense but unkind in every other, and most units have moved away from it.

Outside pregnancy and through most of pregnancy, the cervix is firm, closed and roughly three to four centimetres long. Towards term it softens, shortens and opens — a normal, hormonally driven remodelling. In cervical insufficiency that process begins far too early. The typical story is not dramatic: a feeling of pelvic pressure or heaviness, a change in discharge to something more watery or mucousy, perhaps mild backache, and then, on examination, a cervix that is already open with the membranes bulging through.

What makes it more likely

Previous surgery on the cervix is the clearest risk factor, particularly deep or repeated excisions carried out after treatment for abnormal cervical cell changes. Mechanical trauma also matters: forced dilatation of the cervix, difficult instrumentation, or a significant cervical tear at a previous birth. Less commonly, there are congenital differences in the cervix or uterus, or an underlying connective tissue disorder affecting collagen. In a large proportion of women, no cause is ever identified.

One caveat is worth holding on to. A short cervix seen on a scan is a finding, not a diagnosis. Infection and inflammation can shorten a cervix just as effectively as structural weakness can, and a stitch placed into an inflamed cervix does not help and may do harm. That is precisely why a cerclage is not offered to everyone with a short measurement.

Who is offered a cerclage: history, ultrasound and rescue

There are three recognised routes to a cerclage, and they are decided in quite different ways. Knowing which one is being discussed with you explains most of what follows — the timing, the urgency and the tone of the conversation.

History-indicated cerclage

This is planned in advance, before anything has gone wrong in the current pregnancy, on the strength of your obstetric history alone. It is generally considered when there have been three or more previous second-trimester losses or very early spontaneous preterm births, particularly where the pattern was painless cervical opening rather than labour, bleeding or infection. Because it is elective, it is booked rather than rushed.

Ultrasound-indicated cerclage

This is offered during the pregnancy, after a transvaginal scan shows the cervix has shortened — but the scan finding alone is not enough. It is typically considered in a single pregnancy where there has already been one or two previous spontaneous preterm births or mid-trimester losses, and the cervical length falls below about 25 mm before 24 weeks. The scan is the trigger; the history is what makes the scan meaningful.

Rescue (emergency) cerclage

This is considered when the cervix is already open and the membranes are visible or bulging, found either on examination or because of symptoms. It is only an option if there are no contractions, no evidence of infection, no significant bleeding and the membranes are intact. It is the most difficult of the three technically and the most carefully individualised.

Equally important is who is not routinely offered a stitch: a woman with an incidentally short cervix and no relevant history, where vaginal progesterone is usually the preferred option, and women expecting twins, where cerclage is not routine and has in some settings been associated with harm. If you have just been told your cervix is short and nothing like this has happened to you before, the expected conversation is about progesterone and closer monitoring rather than about surgery.

How the cervix is assessed before a decision is made

The measurement that drives most cerclage decisions is cervical length on a transvaginal ultrasound scan, not an abdominal one. A scan through the abdomen cannot measure the cervix reliably — an empty bladder, maternal body shape and shadowing from the baby's head often obscure it altogether, and a full bladder presses the cervix together so that it measures falsely long and funnelling is missed. The transvaginal approach gives a clear, reproducible measurement and is safe in pregnancy, including when the cervix is short.

If you are being monitored because of your history, you will usually be offered serial scans roughly every one to two weeks from around 16 weeks until 24 weeks. The sonographer measures the closed length of the cervical canal and looks for funnelling — the membranes dipping down into the upper part of the canal, which makes the functional length shorter than it looks. A single measurement matters less than the trend across several scans: a cervix that is stable at 28 mm is a different proposition from one that has fallen from 35 mm to 28 mm in a fortnight.

Alongside the scan, your doctor will usually examine the cervix with a speculum and take vaginal swabs. Screening for and treating vaginal infection is part of the groundwork, because conditions such as bacterial vaginosis and untreated urinary infection are associated with preterm birth, and because active infection is a reason not to place a stitch. A detailed scan of the baby is also done beforehand, so that the decision is made with the fullest possible picture.

What the scan cannot tell you is why the cervix is shortening. That judgement comes from putting the measurement together with your history, your symptoms and your infection screen.

When in pregnancy the stitch is placed

Most cerclages are placed between 12 and 24 weeks, with the exact timing depending on which of the three indications applies.

A history-indicated cerclage is usually placed at around 12 to 14 weeks. This is deliberate. By then the first-trimester scan has confirmed a viable, correctly dated pregnancy, the nuchal and screening assessments have been done, and the highest-risk window for early miscarriage has passed — so the stitch is not being placed into a pregnancy that was never going to continue. Waiting much beyond 14 weeks has no particular advantage for an elective procedure.

An ultrasound-indicated cerclage is placed whenever the shortening is identified, which in practice means somewhere between 16 and 24 weeks. Twenty-four weeks is the usual upper limit for this indication in most units, partly because the evidence base thins out beyond it and partly because after that point the balance shifts towards other preterm birth care, including planning for steroids and the right place of birth.

A rescue cerclage has a wider and softer window, often quoted as roughly 16 to 27 weeks, and local practice varies. The later it is considered, the more the discussion weighs the potential benefit of a few more weeks in utero against the risk of disturbing exposed membranes.

There is also the transabdominal route, which is different again: it is usually placed before pregnancy, or early in the first trimester, because it is a more involved operation and the uterus is easier to work around when it is small.

How the procedure is done and what anaesthesia is used

A vaginal cerclage is a short operation, usually taking twenty to thirty minutes, most often performed under spinal anaesthetic so that you are awake but numb from the waist down. General anaesthetic is used in some circumstances, including when a spinal is not suitable or when the situation is an emergency.

You will be asked not to eat or drink for several hours beforehand. On the day, the baby's heartbeat is confirmed, you are positioned with your legs supported, and the vagina is cleaned. A speculum is placed, the cervix is held gently with soft forceps, and the suture is passed around it in a circle and tied. Sometimes a catheter is placed in the bladder during the procedure and removed afterwards. Routine antibiotics and routine drugs to relax the uterus are not generally given for a planned cerclage, though they may be used in individual cases — particularly for a rescue stitch — at the surgeon's judgement.

McDonald, Shirodkar and the abdominal route

Neither of the two vaginal techniques is clearly superior, and the choice usually comes down to the anatomy in front of the surgeon and their own experience. A McDonald stitch is quicker and far simpler to remove; a Shirodkar sits higher and is sometimes chosen when there is very little cervix to work with.

A transabdominal cerclage is reserved for situations where the vaginal route is not possible or has already failed — for example after surgical removal of the cervix, or where the cervix is too short to hold a stitch. It is performed by keyhole surgery or an open operation, and it carries two important consequences: the baby must be delivered by caesarean section, and the stitch can be left in place for future pregnancies.

Most women go home the same day or after one night in hospital.

Recovery, activity and the weeks that follow

Expect period-like cramping and light spotting for a day or two, and an increase in vaginal discharge that may continue for the rest of the pregnancy. The suture material behaves as a foreign body, and the cervix responds by producing more mucus. This is normal and not in itself a sign of trouble, though a change in colour or smell is — see the next section.

Simple pain relief such as paracetamol is usually enough. Most women take it easy for the first 24 to 48 hours and then return gradually to ordinary life. It is worth saying plainly that strict bed rest is not recommended. There is no good evidence that lying flat protects a cerclage, and prolonged immobility carries real harms of its own: blood clots, loss of muscle condition, and a considerable toll on mood and sleep. What is sensible is avoiding heavy lifting, long periods standing, and anything that leaves you with persistent pelvic ache.

Advice on sexual intercourse varies between units and is individualised; many doctors suggest avoiding it for at least a week or two after placement, and for longer where the cervix is very short. Ask your own doctor rather than assuming. Work, driving, walking, swimming and ordinary household activity are usually fine unless you have been told otherwise.

You will normally be followed up with further cervical length scans and reviewed in a preterm birth or high-risk clinic as part of your pregnancy follow-up. Keep written confirmation that you have a stitch in your handheld notes or on your phone, and tell any clinician who sees you in an emergency, wherever you are. If labour begins with a vaginal stitch still in place, it has to come out.

What to watch for after a cerclage

The single most important thing to understand is that a stitch does not make symptoms safe to ignore. If anything changes, you should be assessed, and you should not wait until the next working day.

Contact your maternity unit straight away if you notice any of the following:

• Regular tightenings, cramping or period-type pain that comes and goes in a pattern
• Any fresh vaginal bleeding in pregnancy, however light
• A gush or a persistent trickle of clear or pinkish fluid, which may mean the waters have broken
• Discharge that becomes green, grey, brown or offensive-smelling
• A temperature, shivering, a fast heartbeat or simply feeling unwell
• Constant low abdominal or back pain, or a heavy dragging sensation in the pelvis
• Pain or burning when passing urine
• Reduced or changed fetal movements, once you are far enough on to feel them

Discharge deserves a particular word. A general increase in clear or milky discharge is expected with a stitch in place, but a shift in colour, consistency or odour is not — it can be the first sign of infection, and infection is the main reason a cerclage has to be removed early. If you are unsure whether what you are seeing is within the normal range, it is worth reading about the different types of vaginal discharge and then ringing anyway. Nobody in a maternity unit minds being called about a cerclage.

Risks and complications of cervical cerclage

Cerclage is a surgical procedure with real risks, which is exactly why it is reserved for women whose history or scan findings justify them. Your doctor should set these out before you consent, and most of them are uncommon.

At the time of the operation, the recognised risks include bleeding from the cervix, accidental rupture of the membranes, injury to the bladder (slightly more likely with the higher Shirodkar placement), and the usual risks of spinal or general anaesthesia. The membranes are more vulnerable the more the cervix has already opened, which is why a rescue cerclage carries a higher technical risk than a planned one.

Later in the pregnancy, the stitch can become displaced or cut through the tissue, the cervix can become infected, and in some cases a cerclage is followed by the very thing it was placed to prevent — preterm prelabour rupture of the membranes, preterm labour or miscarriage. It is not always possible to know whether the procedure contributed or whether the underlying problem simply ran its course.

At the other end, there is the risk of cervical trauma. If labour establishes while a stitch is still in place, the cervix can tear badly as it tries to open against the suture. Scarring from the stitch occasionally makes the cervix slow to dilate in a subsequent labour. Rarely, a cerclage leads to a fistula or to significant cervical stenosis.

A transabdominal cerclage adds the risks of abdominal surgery, commits you to caesarean birth, and means that if the pregnancy is lost in the second trimester the baby must be delivered through an incision in the uterus rather than vaginally.

When and how the stitch is removed

A planned vaginal cerclage is usually removed at around 36 to 37 weeks, before labour is likely to start. By that point the pregnancy is at term or close to it, and leaving the stitch any longer risks the cervix tearing if labour begins unexpectedly.

Removing a McDonald stitch is generally a quick outpatient procedure, much like having a smear taken. A speculum is passed, the knot is located, the suture is cut and pulled out. Most women describe it as briefly uncomfortable rather than painful, and no anaesthetic is usually needed. A Shirodkar stitch, or one that has been buried under the vaginal lining or has become embedded in tissue, may need to be removed in theatre under spinal anaesthetic.

Removal is brought forward in several situations: if labour becomes established, if the waters break before term, if there is significant bleeding, or if there is evidence of infection inside the uterus. When the membranes rupture early, the decision about immediate removal is individualised, weighing the risk of infection with a foreign body in place against the possible benefit of a little more time for the baby.

Two common misunderstandings are worth correcting. First, removing the stitch does not start labour — many women go on for days or weeks afterwards, and some still need to be induced. Second, if a caesarean is already planned, the stitch does not always have to come out separately; it can often be removed at the time of the operation, though practice varies. An abdominal cerclage is simply left in place.

Alternatives: progesterone, monitoring and the pessary

A stitch is one of several options, and for many women it is not the first one tried. The alternatives are not inferior substitutes — in several situations they are the recommended approach, and a cerclage would be the wrong tool.

Vaginal progesterone

Progesterone given vaginally as a pessary or gel is widely used where there is a short cervix, a previous spontaneous preterm birth, or both. It is usually started somewhere between 16 and 24 weeks and continued until around 34 weeks. It is the preferred option when a short cervix is found incidentally in a woman with no relevant obstetric history, and it is sometimes used alongside a cerclage rather than instead of one. This is a different situation from low progesterone in early pregnancy, which is a separate question entirely.

Cervical length surveillance alone

Watchful waiting with serial transvaginal scans is a legitimate plan, not a decision to do nothing. It keeps the option of a cerclage open if the cervix shortens, while avoiding surgery in the majority whose cervix stays stable.

Cervical pessary

A soft silicone ring placed around the cervix to change its angle and take pressure off it. It requires no anaesthetic and is easily removed, which makes it attractive in principle, but the evidence from trials has been inconsistent and most guidelines do not currently recommend it as routine care.

Alongside all of these sit the modifiable factors: stopping smoking, screening for and treating vaginal and urinary infection, and attending a specialist preterm birth clinic where one is available.

How the decision is individualised

There is no threshold that automatically produces a cerclage, and anyone offering you one should be able to explain why it applies to your pregnancy in particular. The decision is built from several strands at once.

Your doctor will weigh how many previous losses or early births there have been and at what gestation; whether the pattern was genuinely painless cervical opening or whether contractions, bleeding or infection came first; what your cervical length is doing over successive scans rather than at a single moment; whether you have had surgery or trauma to the cervix; whether this is a single or a multiple pregnancy; whether there is any sign of infection now; and how far on you are. Against that sits the real surgical and anaesthetic risk, your own feelings about intervention, and what is realistically available where you will give birth.

It is reasonable to ask direct questions, and reasonable to take a day to think unless the situation is urgent. Useful ones include: which of the three indications am I in; does my history actually place me in the group where a stitch is considered; what exactly would change if we waited and rescanned; what would you do if I were not a candidate for a stitch; what is the plan if it does not hold; and where would I give birth if the baby came early?

What no one can give you is a guarantee. A cerclage is a way of shifting the odds in a pregnancy where the odds need shifting, chosen because the specific pattern in your history or on your scans points towards a mechanical problem the stitch can help with. Understanding that honestly, rather than hoping for a certainty that does not exist, tends to make the rest of the pregnancy easier to carry.