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nt值正常多少正常值
更新时间: 2020-11-05 00:00:00  

NT值是通过B超检测胎儿颈项透明层的厚度,正常范围值应该是3mm以下,3mm以上,胎儿有先天性心脏病、神经管畸形的可能性增加。如果在正常范围内也不能完全排除胎儿有畸形的可能,还得结合孕妇血清学筛查,进行唐氏筛查,用来排除胎儿是否有18三体综合征,21三体综合征等染色体异常的可能性。

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