If non-invasive DNA testing is done, amniocentesis is not needed if the results do not suggest high risk. If it suggests high risk, amniocentesis is needed to make a definitive diagnosis. Some women who are at high risk for Down’s syndrome screening will have a noninvasive DNA test that is a little more accurate than Down’s syndrome screening. Non-invasive DNA testing is used to assess the risk of common chromosomal abnormalities in the fetus by drawing peripheral blood from the pregnant woman and examining the fetus’ free DNA. Whether or not a pregnant woman has to undergo amniocentesis after having non-invasive DNA depends mainly on the results of the non-invasive DNA test. If the results suggest a low risk, there is usually no need to undergo amniocentesis, and if it suggests a high risk, amniocentesis should be performed. In addition, amniocentesis is required if there are indications for amniocentesis, such as family genetic history. Pregnant women need to go to regular hospitals for amniocentesis to improve the accuracy of the test results and reduce amniotic fluid infection and embryo damage. –