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唐筛中21三体多少是正常
更新时间: 2020-11-05 00:00:00  

21三体正常值应该是1:308,做唐筛的最佳时间是15-20周。

唐氏筛查是唐氏综合征产前筛选检查的简称,是一种特殊意义的检查方法。目的是通过化验孕妇的血液,检测母体血清中甲型胎儿蛋白、绒毛促性腺激素和游离雌三醇的浓度,并结合孕妇的年龄、体重、孕周等方面来判断胎儿患先天愚型、神经管缺陷的危险系数。

关键词: 多少 正常

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