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无创T21值多少正常
更新时间: 2020-11-05 00:00:00  

小于1:1000。无创T21值介于1:270到1:1000是临界风险,高于1:270则是高风险,这时建议去做无创DNA或者羊水穿刺,以明确胎儿是否有染色体方面发育畸形。唐氏筛查21三体综合症的截断值是1:270。

关键词: t21 多少 正常

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