Non-invasive DNA testing can be done at 17 weeks, which is a more appropriate time to test for non-invasive DNA. Non-invasive DNA testing can be done between 12 and 22+6 weeks of pregnancy, and 17 weeks of pregnancy is not too early or too late in this time frame for the test to be accurate. Non-invasive DNA is a test that examines free DNA fragments in the mother’s peripheral blood to screen for fetal chromosomal abnormalities, such as whether or not you have Down’s syndrome, Edward’s syndrome, or Patau’s syndrome, and the test is more accurate and has a lower risk factor. Non-invasive DNA testing is recommended for pregnant women who have a critical risk or high risk for Down’s screening during pregnancy, are over 35 years of age, and have a history of previous pregnancies with chromosomal abnormalities. It is recommended to go to a regular hospital for testing to improve the accuracy of the test.