Down syndrome screening, abbreviated as Down syndrome screening, and non-invasive DNA testing are both medical methods for detecting Down syndrome fetuses. Generally, pregnant women only need to choose one method to check the condition of the fetus. But many people are not clear about the difference between Tang screening and non-invasive DNA. So, today we are going to talk about the difference between Tang screening and non-invasive DNA.
The full name of Down syndrome prenatal screening is Down syndrome prenatal screening, which is currently one of the important items of common prenatal examinations. This uses the serum of pregnant women to detect fetal growth and development. Generally, the best time for Down syndrome screening is 15-20 weeks of pregnancy, and it is recommended that pregnant women take blood on an empty stomach
Non invasive DNA is currently the most common method for detecting Down syndrome in fetuses, and this non-invasive DNA is used to detect the fetal chromosome status by detecting the free DNA outside the fetus. Generally, the longer the gestational age of a pregnant woman, the higher the amount of free DNA in the fetus. So this method has an accuracy rate of up to 99%, and doctors also recommend that pregnant women undergo a check-up after 12 weeks of pregnancy.
Although both are methods for checking the chromosomal condition of the fetus, there are also some differences. The characteristics of Tang screening are simplicity and low cost, which is more suitable for most people. However, its disadvantage is that its accuracy is not high enough, which is not suitable for pregnant women with multiple pregnancies. After all, the risk is high, and it is best to further check to ensure safety.
Non invasive DNA has high accuracy, but it is expensive and has limited promotional power, making it unsuitable for families with lower to average living standards. So, if a pregnant woman has only one child, she can choose a Down syndrome screening test, while for a pregnant woman with multiple children, it is best to choose non-invasive DNA testing to check the fetal development.
