It is possible that a Down’s syndrome result with a critical risk may be problematic and require further testing.
Down’s syndrome screening is an important method to screen the fetus for congenital and hereditary diseases, if the result of Down’s syndrome screening is low risk is generally normal, if the risk value is located in the critical risk, then the fetus is likely to have chromosome-related diseases, in this case, further examination is needed to rule out the abnormality.
For the Down screening results of critical risk of pregnant women, in the clinic will generally do non-invasive DNA testing, take the serum of pregnant women, if the non-invasive DNA is low risk, generally no problem. However, if the non-invasive DNA is high risk, it is necessary to do amniocentesis to further determine whether the fetus has problems.