Pregnancy is a very happy thing in every woman's life, and after pregnancy, women should also go to the hospital for prenatal check ups on time. Through various tests, it can be determined whether the pregnant woman and the fetus are in a healthy state. One of the tests is non-invasive DNA, which requires blood to be drawn. So how many tubes of blood do non-invasive DNA need to be drawn?
When pregnant women undergo non-invasive DNA testing, it is usually necessary to take about 4ml of blood and 2-3 tubes. Non invasive DNA testing is a non-invasive procedure that does not cause miscarriage in pregnant women, so there is no need to worry.
Pregnant women should pay attention to non-invasive DNA testing without fasting. By collecting venous blood from pregnant women, fetal DNA can be extracted from the blood and compared with the mother's DNA. By conducting relevant examinations and analyzing with some software, the risk of fetal diseases can be calculated. Due to the relative stability of free DNA in the mother's body, fasting testing is not necessary.
The main purpose of non-invasive DNA testing is to detect whether the fetus has chromosomal abnormalities, in order to determine whether the fetus has chromosomal diseases. Down syndrome screening is usually performed in women between 16 and 20 weeks of pregnancy, and if the screening results indicate a high risk, non-invasive DNA is needed to confirm the diagnosis. Choose a reputable and authoritative hospital to ensure the accuracy of the examination results.
Before undergoing non-invasive DNA testing, pregnant women should pay attention to controlling their emotions, not being too nervous, maintaining a calm mood, and ensuring the smooth progress of the examination.
