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孕14周的正常值是多少呢
更新时间: 2020-11-04 00:00:00  

NT值是胎儿颈厚透明带宽度,是筛查唐氏儿的一种检测。正常妊娠11-14周颈项透明层厚度随孕周略微上升。正常情况下是11周到14周之内有一个NT的检测,主要就是颈项透明带的厚度,原则上是不超过2.5毫米,大部分是在0.6到0.7个毫米。测量值小于2.5mm为正常,大于等于此值为增厚。

关键词: 正常值 多少

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