Which of the following statements would NOT support eligibility for VBAC?

• A. Prior low-transverse cesarean scar
• B. Adequate pelvis
• C. Prior classical uterine incision
• D. Ongoing labor with monitoring

Answer: (C)

The key factor in VBAC eligibility is the safety of labor given the uterine scar and the ability to monitor and respond to problems. A prior low-transverse cesarean scar is favorable for attempting VBAC because the incision is in the lower uterus and carries a relatively low risk of rupture, making vaginal delivery feasible in a monitored setting. An adequate pelvis supports VBAC by reducing the chance that labor fails due to cephalopelvic mismatch, which helps ensure a successful vaginal birth if labor progresses.

A prior classical uterine incision, however, would not support VBAC. A vertical (classical) incision in the upper uterus significantly increases the risk of uterine rupture during labor, so this history is a strong contraindication to attempting VBAC. Ongoing labor with monitoring aligns with VBAC practice because labor can be proceeded with vigilant fetal and uterine monitoring, allowing a prompt cesarean if rupture or distress occurs.

So the statement that would NOT support eligibility for VBAC is the history of a prior classical uterine incision.