Nursing care
Vaginal Birth After Cesarean, explained for the bedside and the exam
Written and reviewed by Dana Whitfield, RN, MSN · 4 min read · Updated September 2026
Short answer
Vaginal birth after cesarean is attempting labour and vaginal delivery in a patient with a prior cesarean, and it requires a low transverse uterine scar as the baseline eligibility criterion. The nursing priority throughout labour is continuous fetal monitoring, because the earliest sign of uterine rupture is sudden cessation of contractions accompanied by abdominal pain and fetal distress.
What the concept actually says
VBAC is a trial of labour offered to a patient with one or more prior cesarean deliveries, aiming for vaginal birth rather than a scheduled repeat cesarean. Eligibility rests on the type of uterine incision from the previous surgery, not simply on the fact that a cesarean happened before.
A low transverse incision is the requirement for a patient to be considered a reasonable VBAC candidate, because that scar carries the lowest risk of rupture under labour forces. A classical, low vertical, or unknown-type incision is generally considered a contraindication, since these scars are weaker and more likely to separate under the stress of contractions. This distinction is the single fact every other part of VBAC care builds on.
The clinical reasoning behind it
A low transverse incision sits in the thinner, less vascular lower uterine segment, which contracts less forcefully during labour and heals with a stronger scar. That scar tolerates the repeated stretch and pressure of contractions reasonably well, which is why VBAC is offered to these patients at all.
Uterine rupture is the catastrophic failure of that scar, and it does not usually announce itself with heavy external bleeding first. The uterus tears, the contraction pattern that was building suddenly stops rather than intensifies, the patient reports a sharp or tearing abdominal pain unlike her prior contractions, and the fetal heart rate drops into a pattern of bradycardia or severe variable decelerations. Recognising that combination, and recognising it fast, is the entire clinical reasoning behind continuous monitoring during a VBAC labour.
Applying it under time pressure
During a VBAC trial of labour, continuous electronic fetal monitoring runs from admission through delivery, with no intermittent monitoring windows, because rupture can develop and progress within minutes. IV access is maintained throughout labour so that fluids, blood products or emergency medications can be given without delay if rupture occurs.
When contractions that had an established pattern suddenly stop, and the patient describes new, different abdominal pain, treat it as a rupture until proven otherwise: notify the provider immediately, prepare for emergency cesarean, and do not wait for a repeat contraction to confirm the pattern change. Vaginal bleeding may or may not be present at this stage, so its absence should never delay the call. Time to delivery after rupture is the determinant of outcome for both patient and fetus, which is why hesitation here carries real cost.
Common misconceptions
A frequent misconception is that any prior cesarean disqualifies a patient from VBAC. It is the incision type, not the fact of a prior cesarean itself, that determines eligibility, and a patient with a documented low transverse scar and no other contraindications remains a candidate.
Another misconception is that uterine rupture always presents with dramatic vaginal bleeding, mirroring how nurses are taught to picture placental abruption or previa. Rupture is defined by the sudden loss of the contraction pattern plus pain plus fetal distress; visible bleeding is often minimal or delayed because the blood can collect intra-abdominally rather than draining externally. Waiting for bleeding before acting is the error this misconception produces.
Practice scenarios
Scenario one: a VBAC patient at 6 cm dilation has been contracting every three minutes for the past two hours. The nurse notes the monitor now shows no contractions for the last fifteen minutes, the patient reports new sharp suprapubic pain, and the fetal heart rate has dropped to 90 with minimal variability. The correct nursing action is immediate provider notification and preparation for emergency cesarean, not repositioning and re-monitoring.
Scenario two: a patient with a documented classical uterine incision from a prior cesarean requests a trial of labour for her current pregnancy. The nurse's role is to recognise that this incision type is generally a contraindication to VBAC and to ensure this is discussed with the provider before a labour plan is finalised, since offering VBAC here would not match standard practice.
Key takeaways
VBAC candidacy depends on the uterine incision being low transverse; this single fact should be confirmed before any VBAC labour plan proceeds. Continuous fetal monitoring is non-negotiable for the duration of a VBAC labour.
Uterine rupture presents as a triad: contractions that suddenly stop, new and different abdominal pain, and fetal heart rate deterioration. Vaginal bleeding is not required for this picture and its absence should never be reassuring on its own. Any stem combining these three findings in a VBAC patient is describing an emergency that needs immediate escalation.
The next step on this is the same as on everything else here: answer questions and read the rationales. Our maternity and newborn practice questions are the closest set to what this page covers.
Common questions
Is intermittent fetal monitoring ever acceptable during a VBAC labour?
No. Continuous electronic fetal monitoring is standard for the entire VBAC labour because uterine rupture can develop and progress rapidly, and intermittent monitoring could miss the early fetal heart rate changes that signal it.
What uterine incision types make a patient a poor VBAC candidate?
A classical incision, a low vertical incision, or an incision of unknown type are generally considered contraindications. A documented low transverse incision remains the standard requirement for VBAC eligibility.
Does uterine rupture always cause heavy vaginal bleeding?
Not necessarily. Blood loss can be largely intra-abdominal rather than vaginal, so visible bleeding may be minimal even with a significant rupture. The reliable early signs are the sudden loss of the contraction pattern, new abdominal pain, and fetal distress.
What should the nurse do first if contractions suddenly stop in a VBAC patient with new abdominal pain?
Notify the provider immediately and prepare for possible emergency cesarean. This combination is treated as suspected uterine rupture until ruled out, and the priority is speed, not waiting for additional confirming signs.