Both Down screening and minimally invasive are performed by taking the blood of the pregnant woman, and are the more important screening tests during pregnancy.
Down screening refers to Down’s syndrome screening and minimally invasive refers to non-invasive DNA testing, both of which are performed by drawing blood from the pregnant woman.
1. Down’s syndrome screening. Generally at 15~20 weeks of pregnancy, pregnant women need to go to the hospital for Down’s syndrome screening, which is done by taking blood from pregnant women, checking serum alpha-fetoprotein, human chorionic gonadotropin and free estriol, etc., and then according to the age of the pregnant woman and the gestation week, etc. to comprehensively calculate the risk coefficient of the fetus having Down’s syndrome.
2. Non-invasive DNA test. This is a prenatal testing technology, also through the extraction of pregnant women’s blood to check, is the extraction of fetal free DNA from the blood of pregnant women, can check out whether the fetus has chromosomal abnormalities, and the accuracy rate is relatively high.