每位孕妇都要查吗? 唐氏血清筛查是检查唐氏儿很有效的方法，任何孕妇都有可能怀上唐氏综合征的胎儿。过去认为：35岁的是高危人群，几率会随着孕妇年龄的递增而升高。现在认为80%的唐氏综合征发生在35岁的孕妇当中。唐氏筛查既能缩小羊水检查的范围，又不会遗漏可能怀有
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- Title: 怀孕期
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