Vaginal Birth After Cesarean (VBAC)

TOLAC and VBAC: the pathway and the outcome

A previous cesarean does not automatically mean the next birth must also be cesarean, but vaginal birth is not automatically suitable for every subsequent pregnancy.

TOLAC means trial of labor after cesarean.

VBAC describes the vaginal birth that results when that labor ends without another cesarean.

A trial of labor can therefore be planned, but successful VBAC cannot be guaranteed before labor begins.

Planned repeat cesarean is the alternative pathway that may also be discussed.

Reviewing the previous cesarean and uterine incision

Planning begins with review of the previous cesarean and the current pregnancy.

The previous operative report can clarify the indication for surgery, uterine incision and any relevant surgical complications.

The skin scar does not identify the uterine incision

The external abdominal scar does not reliably show which uterine incision was used.

The operative report is therefore more informative when available.

Other factors in assessment

Planning also considers the reason for the previous cesarean, previous vaginal birth, number of previous cesareans, maternal health, fetal presentation, the current pregnancy and relevant complications.

Likelihood of successful VBAC and factors that influence it

RCOG patient information states that about 3 in 4 women with one previous cesarean, a straightforward pregnancy and spontaneous onset of labor give birth vaginally.

This is population guidance, not a calculator or personal prediction.

Previous vaginal birth

Previous vaginal birth, particularly a previous successful VBAC, is associated with a greater likelihood of another vaginal birth.

RCOG cites a likelihood of about 8 to 9 in 10 when there has been a previous vaginal birth.

Spontaneous onset of labor

Spontaneous labor is generally associated with a higher likelihood of successful VBAC than some induced labors, but it does not guarantee vaginal birth.

When VBAC may not be advised

Some circumstances make planned cesarean more appropriate than a trial of labor.

RCOG examples include previous uterine rupture, a previous classical upper-segment uterine incision, or a current pregnancy complication that requires cesarean birth.

After two previous cesareans

Selected women may discuss a trial of labor after two previous cesareans, but this requires more detailed specialist assessment.

Previous surgical history, the current pregnancy and facility protocol all matter.

This should not be presented as a routine or guaranteed pathway.

After three or more previous cesareans

RCOG patient information states that VBAC is normally not advisable after three or more previous cesareans.

Complex circumstances require specialist individualized assessment rather than an automated rule.

Uterine scar rupture: uncommon but important

Separation or rupture of the previous uterine scar is an important risk discussed when planning TOLAC.

It is uncommon, but it can be serious and may require rapid emergency cesarean birth.

RCOG patient information cites an approximate risk of 1 in 200 during planned VBAC after a previous cesarean.

This is not an individual risk estimate. Risk can differ according to surgical history, onset of labor and other clinical factors.

Spontaneous labor, induction and reaching 41 weeks

Induction after previous cesarean

Induction can be considered in selected circumstances, but it requires additional assessment because of the previous uterine scar.

NICE and RCOG note that induction is associated with an increased uterine rupture risk compared with spontaneous labor.

Method selection therefore depends on cervical findings, maternal and fetal condition, the uterine scar and local clinical protocol.

An induction medicine or method should not be selected using online content alone.

If labor has not started by 41 weeks

RCOG advises another discussion of birth options if labor has not started by 41 completed weeks.

Depending on assessment, options may include further waiting, induction or planned repeat cesarean.

Monitoring, pain relief and assisted birth during labor

Continuous fetal monitoring

NICE recommends continuous electronic fetal monitoring during labor after a previous cesarean.

Monitoring helps identify changes that may require rapid clinical reassessment.

Labor pain relief

Planning VBAC does not automatically prevent epidural analgesia or other appropriate pain-relief options.

Pain relief is discussed according to maternal preference, clinical circumstances and local anesthetic practice.

Assisted vaginal birth

VBAC may end in spontaneous vaginal birth or an assisted vaginal birth with forceps or ventouse if assistance becomes clinically appropriate.

Assisted vaginal birth still represents birth without another cesarean.

Facility requirements and immediate emergency capability

VBAC availability should not be assumed at every hospital.

It depends on clinical policy, team expertise, fetal-monitoring capability and emergency response.

Immediate cesarean capability

NICE recommends labor care in a unit with immediate access to cesarean birth when required.

On-site blood transfusion services

NICE also recommends appropriate on-site blood transfusion services where labor after previous cesarean is managed.

Facility capability does not equal individual eligibility

A hospital supporting VBAC does not automatically mean every woman with a previous cesarean is suitable for TOLAC.

Facility capability and individual clinical suitability are separate decisions.

Possible outcomes and comparing repeat cesarean

A trial of labor can lead to spontaneous vaginal birth, assisted vaginal birth, or unplanned cesarean if labor does not progress or maternal or fetal concerns develop.

Unplanned cesarean during planned VBAC

RCOG states that about 25 in 100 women planning VBAC may require emergency cesarean, commonly because labor slows or fetal wellbeing becomes a concern.

These are population estimates, not individual predictions.

Potential benefits of successful VBAC

Successful VBAC avoids another abdominal operation and its associated surgical recovery.

Avoiding another uterine scar may also be relevant when future pregnancies are planned, because some surgical and placental risks become increasingly important with repeat cesareans.

Planned repeat cesarean is not universally safer

There is no single best pathway for every pregnancy after a previous cesarean.

Planned repeat cesarean largely avoids the scar-rupture risk associated with labor, but it remains major surgery with recovery, surgical risks and possible implications for future pregnancies.

Benefits and risks of both pathways therefore need to be compared for the individual pregnancy.

Planning VBAC in Saudi Arabia without guaranteeing the outcome

Birth planning should ideally occur during antenatal care rather than waiting until labor begins.

Previous surgical records, medical history and current pregnancy information can be reviewed before documenting the birth plan.

Questions to ask the maternity facility

• Does the facility support VBAC after individual assessment?
• Is continuous fetal monitoring available during labor?
• Are anesthesia and operating-theatre services immediately accessible when required?
• Can emergency cesarean birth be performed without unnecessary delay?
• Are appropriate on-site blood transfusion services available?
• What is the local approach to induction after previous cesarean?

A provider-dependent clinical pathway

A trial of labor can be planned with a suitable maternity service, but successful VBAC cannot be guaranteed before labor.

LahaLak therefore represents VBAC as a provider-dependent clinical pathway requiring assessment, not as a guaranteed birth product.