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怀孕nt值多少正常值是多少
更新时间: 2020-11-04 00:00:00  

在妊娠11~13+6周时,胎儿颈背部会出现一无回声带。NT值即颈项透明层厚度,一般在孕11~13+6周之间用超声检查的方法测定。目前国内外对于NT值正常范围存在一定争议,但多数研究将NT值小于2.5毫米时判断为正常,大于等于2.5毫米时判断为增厚。正常情况下NT厚度随着孕周的增加而增加,所以必须结合孕周判定NT值是否正常,不能简单界定NT的正常值。

关键词: 怀孕 nt 多少 正常值

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