Down’s syndrome screening results take different amounts of time depending on the hospital, but usually not more than a week. The Down’s syndrome test is a blood test that is performed on the mother’s body to determine if the fetus has any chromosomal abnormalities, and has a relatively low accuracy rate with some false-negative and false-positive probabilities. Therefore, high-risk or high-risk pregnant women, such as those who are older than 35 years old or younger than 18 years old, have a history of giving birth to babies with Down syndrome. A history of multiple miscarriages with no apparent cause requires non-invasive DNA or amniocentesis to further clarify the presence of abnormalities, which is more accurate. The Down’s syndrome test is performed between the thirteenth and eighteenth weeks of pregnancy and requires a fasting blood test. During pregnancy, you need to pay attention to regular prenatal checkups, and actively improve the examination, so as to achieve the purpose of eugenics.