Patient's question:
Before being pregnant for more than four months, I had already undergone one screening test for Down syndrome. However, the doctor said that another screening test for Down syndrome would be necessary later. So, I would like to understand why the screening test for Down syndrome needs to be done twice.Doctor's answer:
The period of 15-20 weeks of pregnancy is a better time for Down syndrome screening. Doctors recommend that the Down syndrome test should be continued for 15-20 weeks, but each examination hospital has its own situation. The hospital should inform the specific resident doctor of the examination time. At this stage, the possibility of congenital stupidity can be predicted through the examination. How the Down syndrome screening is implemented twice determines the specific situation of the pregnant woman and the specific numbers. The main purpose of the Down syndrome screening is to prevent, to a certain extent, the risk of fetal congenital rape. Generally, pregnant women can obtain the screening results within one week after blood draw. If the first Down syndrome screening result is not too risky, there is no need to do another Down syndrome screening.