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孕20周 nf正常值是多少
更新时间： 2020-11-05 00:00:00  

NT是指胎儿颈项背部皮肤层与筋膜层之间的软组织的最大厚度。妊娠10～20周时，NT≥3mm视为异常。也就是说，nt值正常范围在3mm以下。如果检查出来nt值大于3mm，一般是要做个羊水穿刺或者无创DNA检查进行进一步检查的。羊水穿刺有一定的风险性，无创DNA的风险比较小，建议做无创DNA。

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