Down’s Screening Critical Risk Nothing you can eat can prevent it. Down’s screening critical risk is a manifestation of the results of a Down’s screening test performed between 15 and 20 weeks of pregnancy. There are high risk, low risk and critical risk of Down’s screening results, where critical risk is between high risk and low risk, but does not necessarily mean that the fetus will develop Down’s syndrome. Down’s syndrome screening involves taking peripheral blood of pregnant women for HCG, alpha-fetoprotein and other tests, and combining them with the month of pregnancy, age of the pregnant woman, weight, and the size of the fetus’s biparietal diameter to determine whether there is any abnormality in the fetus. The Down’s syndrome test shows a critical risk, which does not determine that the fetus has chromosomal abnormalities, and requires further non-invasive DNA or amniocentesis to determine whether the fetus has any developmental abnormalities. If there is fetal abnormality, it is necessary to terminate the pregnancy in a timely manner. Without abnormalities, it is also necessary to carry out four-dimensional ultrasound macro-anomalies between the 22nd and 26th weeks of pregnancy to further rule out the possibility of fetal malformations. If there are any symptoms of physical discomfort, you should go to the hospital in time and consult your physician for guidance.