Excessive bleeding from the uterus refers to loss of more than about 1 pint of blood during or immediately after vaginal delivery of a baby or loss of more than about 2 pints after cesarean delivery.
After the baby is delivered, excessive bleeding from the uterus is a major concern.
Ordinarily, the woman loses about 1 pint of blood during and after vaginal delivery. Blood is lost because some blood vessels are opened when the placenta detaches from the uterus. The contractions of the uterus help close these vessels until the vessels can heal. Typically, cesarean delivery results in about twice the blood loss as vaginal delivery, partly because delivery requires an incision in the uterus, and a lot of blood is pumped to the uterus during pregnancy.
In vaginal deliveries, loss of more than about 1 pint of blood during or after the third stage of labor (when the placenta is delivered) is considered excessive. In cesarean deliveries, loss of more than about 2 pints is considered excessive. Excessive blood loss usually occurs soon after delivery but may occur as late as 1 month afterward.