Obstet Gynecol 136 (5): 1 - 10, 2020. doi: 10.1097/AOG.0000000000004138 Prevention Predisposing conditions (eg, uterine fibroids, polyhydramnios, multifetal pregnancy, a maternal bleeding disorder, history of puerperal hemorrhage or postpartum hemorrhage) are identified antepartum and, when possible, corrected.