借助B超诊断胎儿是对胎否畸形有五大优点：
1、 对人体无创伤、儿畸无射线、诊断作用无痛苦;
2、 能够清晰地显示人体软组织的解剖结构;
3、 可直接观察脏器的活动状态;
4、 施羊膜腔穿刺术时，可以帮助胎盘定位，避免损伤胎儿;
5、 简便、准确、容易被孕妇接受。
对于高度怀疑下列五种胎儿畸形者，可用B超进行诊断：
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