Down's screening at 17 weeks of pregnancy has a high risk of trisomy 21 combined with 1:270. Do

Usually pregnant women in full 15~20 weeks of pregnancy pregnant women, we must carry out Down's screening 21 trisomy comprehensive examination, is a must carry out the abnormal examination project. The current situation of pregnant women, only shows that the fetus is down's child probability is relatively large, does not mean that it must be down's child. It is recommended to carry out amniocentesis to /confirm/i.