产前出血是妊娠期间极其常见的一个高危因素,病因构成复杂,临床诊治困难。尤其是妊娠中晚期阴道出血者,不良妊娠结局显著增加,早产率、胎儿死亡率、围产儿死亡率及产后出血率明显增高。正确、及时地诊断出血原因以及规范管理妊娠期出血的孕妇,是有效控制出血、挽救母儿生命、减少产科并发症的关键。产前超声检查是临床对妊娠中晚期出血病因诊断及预测产前出血者妊娠结局的首选方法。 Prenatal bleeding is extremely common during pregnancy, a high risk factor, the complex cause of the disease, clinical diagnosis and treatment difficulties. Especially in the second trimester of pregnancy with vaginal bleeding, adverse pregnancy outcomes increased significantly, premature birth rate, fetal mortality, perinatal mortality and postpartum hemorrhage was significantly higher. Correct and timely diagnosis of the cause of bleeding and regulate the management of pregnant women bleeding during pregnancy, is to effectively control bleeding, save the mother and child life, reduce the key to obstetric complications. Prenatal ultrasound is the first choice for clinical diagnosis of etiology of middle and late pregnancy and prognosis of prenatal bleeding.