The chances of passing the NT and the non-invasive DNA cannot be accurately predicted, and the two tests are not very well connected. The NT test is usually performed at 11 weeks-13+6 weeks of pregnancy, which is to screen for chromosomal disorders in early pregnancy by ultrasound testing of the thickness of the fetal nuchal translucency. Non-invasive DNA is performed at 12 weeks – 22+6 weeks of pregnancy, where peripheral blood is drawn from the pregnant woman to check the risk of fetal trisomy 21, trisomy 18, and trisomy 13. Passing the NT only means that the fetus does not have severe neural tube malformations at this point in the earlier stages of the pregnancy. Non-invasive DNA determines whether the fetus has any abnormalities at the DNA level, so just because the NT passes does not mean that the non-invasive DNA will definitely pass. These are two different tests, and if the NT passes, it actually has little effect on whether or not the non-invasive DNA passes.