The accuracy rate of Down’s syndrome screening can only reach 65%. If you do not pass this test, you can get a non-invasive DNA test. Non-invasive DNA is a comprehensive analysis and assessment of the risk rate of the fetus for trisomy 21, trisomy 18 and trisomy 13 by taking the serum of the pregnant woman according to the week of pregnancy, her weight and age. The non-invasive DNA test only requires taking maternal venous blood and sequencing the free DNA fragments in maternal peripheral plasma, including fetal free DNA, using the new generation DNA sequencing technology, which can obtain fetal genetic information from an early stage. If the non-invasive DNA test is done with normal values, the baby can be born without any problems. If the non-invasive DNA, and is not passed, further amniotic fluid tests need to be taken, which is the final result. If the amniocentesis test is passed, the baby can be born normally.