看你能不能接受那30%的 概率了. "the test does not identify 30 percent of women who are carrying a baby with Down syndrome"Test accuracy — Approximately 70 percent of women who are carrying a baby with Down syndrome will have a positive triple screen (blood test that measures AFP, uE3, hCG) (show table 2). This means that the test does not identify 30 percent of women who are carrying a baby with Down syndrome. About 5 percent of women who have the triple screen will have a false positive screening test. A false positive result means that the test is positive although the infant is not affected by Down syndrome.Source: http://www.uptodate.com/patients/content/topic.do?topicKey=~yaa42_F_KitsC这只是我在网上google的一个网站里的一篇文章. 本人不是医务人员, 也没有时间读遍所有专业文章. 偏颇之处, 望您自己斟酌.
