Generally, pregnant women can get the results of their Down’s syndrome screening test 1 week after the blood test is drawn. The exact time depends on the requirements of each testing center. Down’s syndrome screening mainly checks the concentration of alpha-fetoprotein, estrogen, and chorionic gonadotropin. It is mainly used to prevent the birth of fetuses with congenital disorders by excluding Down’s syndrome-based hereditary diseases, including trisomy 21, trisomy 18, and trisomy 13. It is generally recommended that Down’s syndrome screening be done within 15-20 weeks of pregnancy, with the best time being within 16-18 weeks. The results of the test are usually available one week after the pregnant woman arrives at the hospital for a blood test, and the doctor also needs to take into account the week of gestation as well as the results of the ultrasound to exclude various congenital anomalies. Once abnormalities are detected, abortion is required. Pregnant women are advised to go to the obstetrics department of the hospital to complete the Down’s syndrome test and other pre-pregnancy tests within the prescribed period of time in order to avoid the birth of a congenitally stupid fetus.