Amniocentesis does not pass is the usual colloquial term for what people mean by the probability of having a problem with the amniocentesis done and is called not passing. The probability of having a problem coming out of amniocentesis, including the amniocentesis that everyone is more concerned about i.e. the positive rate of amniocentesis, that is, if a high risk of Down’s goes for an amniocentesis, the risk value is 1/10, that is, 1 out of 10 is positive. If non-invasive genetic testing is done, the accuracy of non-invasive testing for chromosome 21, 18, and 13 is usually higher, with the accuracy of non-invasive testing for trisomy 21 generally reported to be over 99%, with some variation among reports, but basically above 98%. The accuracy of chromosome 13 is again worse than that of chromosome 18. It is common to see non-invasive high-risk tests for sex chromosomes that are even less accurate than the previous three chromosomes 18, 13, and 21. Therefore when doing a non-invasive genetic test for high risk, it is important to do an amniotic fluid prenatal diagnosis to finally determine if there is a problem with the fetus.