The vbac success rate is only one part of deciding whether to try for a vaginal birth after caesarean (VBAC). Your clinician will also review the type of uterine incision, your previous births and caesarean, your current pregnancy, and whether the hospital can provide an urgent caesarean if needed. The aim is to compare a planned trial of labour after caesarean (TOLAC) with a planned repeat caesarean in light of your circumstances and preferences.
What Shapes The vbac success rate?
A Canadian Medical Association Journal clinical summary by Elizabeth Miazga and Eliane Shore, obstetricians affiliated with Unity Health–St. Michael’s Hospital and the University of Toronto in Toronto, says about three-quarters of people who attempt TOLAC give birth vaginally. It cites higher rates for people with a previous vaginal birth (83%) or previous VBAC (94%). These are broad estimates, not a personal prediction: your current pregnancy and care setting also matter.
The reason for your earlier caesarean is part of the discussion. If it was for a situation unlikely to recur, such as a baby being breech, that may point to a different likelihood of vaginal birth than a reason that could arise again, such as labour not progressing. Your clinician can interpret that history alongside the details of this pregnancy; the earlier reason alone does not decide the outcome.
Your Uterine Scar And Birth History Matter
Ask for the operative report from your previous caesarean, if you do not already have it. The uterine incision—not the scar visible on your abdomen—is central to assessment. A low transverse incision, a horizontal cut in the lower part of the uterus, is the incision for which guidance most clearly supports offering labour when there are no other contraindications. If the record describes a different incision or is unclear, ask how that changes your options and whether specialist review is needed.
Having had two or more caesareans does not automatically answer the question, but it makes the discussion more individualized. The clinical summary estimates uterine rupture at about 0.47% during TOLAC overall and cites a higher estimate of 1.6% with two or more previous caesareans. These figures come from different risk groupings; they are not a precise forecast for any one person. Ask how your scar history, previous vaginal births and local practice affect your own risk assessment.
Benefits, Risks And The Need For Rapid Care
A successful VBAC can avoid another abdominal operation. A TOLAC may, however, end in an unplanned caesarean if labour does not progress or a concern arises. The key uncommon but serious risk is uterine rupture, when the uterine scar separates during labour. If rupture is suspected, urgent surgery and delivery may be needed.
That is why TOLAC is planned in a hospital with continuous fetal heart monitoring during active labour and the ability to provide timely surgery, anaesthesia and urgent delivery. The commonest warning sign of rupture is an abnormal fetal heart tracing. Before choosing a birth setting, ask who is available around the clock and how quickly an emergency caesarean can be performed. This is a safety requirement, not a prediction that an emergency will happen.
Induction or assistance to strengthen labour can affect the balance. A 2025 US cohort study by Pejman Adily and colleagues examined 491,998 TOLACs among people with one previous caesarean and no previous vaginal births, using US National Vital Statistics System data from 2011 to 2021. The researchers found higher odds of rupture with induced or augmented labour than with spontaneous labour. The study applies to that specific group and cannot give your individual odds, but it is a reason to discuss what options your team would consider if labour needs to be started or supported.
Guidance And Access Can Differ By Region
Canadian guidance summarized in the clinical literature supports offering TOLAC after one previous low transverse caesarean when there is no contraindication, with informed discussion and a hospital able to perform a timely caesarean. Guidance and hospital policies can differ, particularly for people with more than one previous caesarean; some settings may have different eligibility criteria or staffing arrangements. Ask your maternity team about the policy where you plan to give birth, rather than assuming another hospital’s rules apply.
The 2025 cohort’s discussion notes that guidance in Australia, Canada and the United States recommends at least nine months between a caesarean and a subsequent TOLAC. In the study’s specific group—one previous caesarean and no previous vaginal births—estimated rupture risk continued to decline as the interval between pregnancies increased, leveling off around 21 months. This observational finding is not the same as a universal guideline or a reason to delay pregnancy without discussing your circumstances. The study does not compare UK or EU national guidance, so ask your local team what recommendations apply.
For your appointment, bring your previous birth records if possible and ask: what was my uterine incision, how does the earlier caesarean reason affect my chances, what would happen if labour does not progress, and is emergency surgery available at this hospital? A clinician who knows your medical and pregnancy history can help you weigh these factors. If you have concerns about your specific risks or records, discuss them with your obstetric team.