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目的：探讨超声检查在早、中、晚期前置胎盘诊断中的应用价值。方法：选取40例研究对象，均在围产期采用经腹超声检查和经阴道超声检查进行定位追踪，回顾性分析两种诊断方式的诊断结果，并与产后临床诊断结果进行对比。结果：经腹超声对前置胎盘的诊断符合率为60.00%，经阴道超声的诊断符合率为90.00%，两种检查方法的诊断符合率比较有差异性（P<0.05）。结论：在前置胎盘的产前诊断中，经阴道超声检查的效果优于经腹超声检查，但在围产期联合应用经腹超声和经阴道超声检查追踪胎盘前置状态能有效提高定位准确性，同时操作简便，具有重要的临床价值。“,”Objective Ultrasonography in early, middle and late application in diagnosis of placenta previa.Methods Selected 40 cases of the research object, were adopted in perinatal abdominal ultrasound and transvaginal ultrasound to locate tracking, two diagnosis way of diagnosis were retrospectively analyzed, and compared with postpartum clinical diagnosis.Results Abdominal ultrasonography in the diagnosis of placenta previa coincidence rate was 60.00%, the transvaginal ultrasound diagnosis coincidence rate was 90.00%, the diagnostic accordance rate of two methods of checking difference (P<0.05) .ConclusionIn the prenatal diagnosis of placenta previa, transvaginal ultrasound examination of the effect is better than that of abdominal ultrasound examination, at the same time, simple operation, has important clinical value.