产后出血是产科最常见最危急的并发症 ,如何正确估计、精确测量阴道分娩的产后出血量 ,对采取正确的治疗措施有重要意义。1　产后出血的定义　　 1987年全国产后出血防治协作组统计 ,产后 2 4小时出血量为 398.6± 2 38.0ml,提出以 5 0 0ml作为产后出血的诊断标准 ,并建议产后 Postpartum hemorrhage is the commonest and most common complication of obstetrics. How to correctly estimate the amount of postpartum hemorrhage in vaginal delivery is of great significance to the correct treatment. A definition of postpartum hemorrhage 1987 National postpartum hemorrhage prevention and control group statistics, 24 hours postpartum hemorrhage amount of 398.6 ± 2 38.0ml, proposed as a diagnostic criteria for postpartum hemorrhage of 500ml, and postpartum