Under ultrasonogyaphic examinations,190 cases of the total were found to be with placenta previa,61 cases with abruptio placentae and 3 cases with uteral rupture.

• 结果超声对晚期妊娠阴道出血检出率85.；2%25(254/298)；上述三种产科合并症的诊断符合率分别为98