Major risk factors |
Previous uterine rupture |
Previous hysterotomy that involved the upper uterus (eg, classical incision, high vertical incision, inverted T or J incision) |
Modest and uncertain risk factors |
Labor, induction, cervical ripening with prostaglandins* |
Increasing maternal age |
Birth weight >4000 grams |
Interdelivery interval less than approximately 18 months (and particularly <6 months) |
More than one previous cesarean birth |
Gestational age ≥41 weeks |
Factors that decrease the risk of rupture |
A prior vaginal birth, either before or after the prior cesarean birth, significantly reduces, but does not eliminate, the risk of uterine rupture.[1] |