Having prenatal check ups during pregnancy is a very important task. Generally speaking, common examination items include B-ultrasound, C-ultrasound, or blood tests. In addition, non-invasive DNA and Down screening tests are also required. Some pregnant women may not be familiar with these tests. So, what is non-invasive DNA Down screening?
Non invasive DNA testing and Tang screening are both necessary tests during pregnancy, which involve extracting blood from pregnant women for examination without causing harm to the fetus. Non invasive DNA testing includes Down syndrome screening. The scope of non-invasive DNA testing is generally very wide. Therefore, when pregnant women undergo non-invasive DNA testing, each item must be checked to ensure the overall health of the fetus.
Non invasive DNA prenatal testing is currently the screening method with the highest detection rate, which can screen for trisomy and sex chromosomes. The main principle of this examination is to detect fetal free DNA in the peripheral blood of pregnant women, which accounts for between 5% and 30% of the total free DNA content in maternal blood.
Under normal circumstances, the higher the gestational age, the higher the content of fetal free DNA in peripheral blood. For the examination of Down syndrome infants, the accuracy of non-invasive DNA prenatal testing can reach 99%, and it can be detected after 12 weeks.
Female friends should not only pay attention to various prenatal examinations during pregnancy, but also pay attention to strengthening nutrition, so as to ensure the smooth growth and healthy birth of the fetus.
