DNA is short for deoxyribonucleic acid which is a very important genetic material in the human body. DNA testing is a form of prenatal screening and diagnosis using genetic sequencing counts, also known as genetic testing technology. The process of doing a non-invasive DNA test is also relatively simple, requiring only about 5 ml of venous blood from a pregnant woman to extract the fetal free DNA fragments contained in the mother’s peripheral blood plasma. Through next-generation high-throughput DNA sequencing and bioinformatics analysis, the genetic information of the fetus can be known, thus detecting the risk rate of the fetus suffering from chromosomal aneuploidy disorders. The results of the test take about a week to three weeks to come back. Prenatal DNA testing is performed to definitively diagnose chromosomal abnormalities such as trisomy 21, trisomy 18 or trisomy 13 in the fetus. If these abnormalities are detected, the pregnancy should be terminated in time, because there are no good drugs or methods to cure congenital diseases caused by chromosomal abnormalities, and the damage to the fetus is lifelong, such as dementia, low intelligence, inability to have children, deformities and a series of other symptoms. Non-invasive DNA testing is recommended for women who are pregnant, if they are financially able to do so, because it is harmless to the pregnant woman and can diagnose in advance whether the fetus has any genetic disorders. If an abnormal DNA test is found, the pregnancy is usually terminated.