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

孕20周nf正常值应该小于6mm,nf是指胎儿皮肤组织厚度,厚度大就表示患21三体综合症机会大。

怀孕第20周已经进入孕中期,从现在开始准妈妈的宫底每周大约升高1厘米。本周子宫底正平肚脐,宫高约16~20厘米,羊水约400毫升。整个子宫如成年人头部般大小。由于子宫日渐增大而挤压胃肠,影响胃肠排空,准妈妈可能常常感到到饱胀、便秘。

关键词: nf 正常值 多少

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