Down screening critical risk and low risk, with low risk being relatively mild. A low risk for Down’s syndrome means that you generally do not have a genetic disorder. If it is a critical risk it means that there may be a genetic disorder, but the chances are lower. The risk result of a Down’s syndrome test is determined by comparing the calculated risk value with the cut-off value. Low risk generally means that there is no genetic predisposition to the disease, so additional testing may not be necessary. Critical risk generally means that there may be a genetic disorder, but the chances are low. So critical risk and low risk, low risk is relatively mild. And if the risk result of Down’s screening is critical risk, the patient is advised to undergo non-invasive DNA testing. The fetus is checked for chromosomal abnormalities to make a definitive diagnosis. Pregnant women during pregnancy should pay attention to do a good job of prenatal checkups, actively listen to the professional doctor’s advice to do a good job of comprehensive care and health care, pay attention to more rest, at the same time, should relax, to avoid nervousness, anxiety, there is any discomfort should be timely to the hospital to consult the doctor, by the doctor to clarify the diagnosis and cooperate with the doctor to deal with the symptoms.