What does it mean to have a high risk of trisomy 18 in Down syndrome screening?

In order to prevent the fetus from being deformed or having some problems, pregnant women in my country are now advised to undergo regular checkups. In addition, Down syndrome screening tests are now free of charge in most parts of my country. So what are the reasons for high risk of trisomy 18 in Down syndrome screening?

If a pregnant woman gets this kind of result, it may be because the result is inaccurate. It is best to perform amniocentesis to check the growth and development of the fetus. It is also possible that this situation may occur due to the woman's old age during pregnancy, or there may be problems with the growth and development of the fetus, which may cause this situation in the examination results.

If this kind of result occurs, it is also relatively dangerous and further examinations must be carried out to understand whether there are any problems with the growth and development of the fetus. If amniocentesis is used and it is found that the fetus does have problems, the pregnancy must be terminated as soon as possible to avoid giving birth to a child with problems.

Especially women who are too old to be pregnant or women who have given birth to a child with Down syndrome before should pay attention to this problem and must do this test at the right time. If the test result is low risk, it means that the fetus is fine, but if the test result is high risk, further examination must be done.

Any pregnant woman is at risk of having a baby with Down syndrome. In the past, it was believed that those aged >35 were the key targets, and the probability would increase as the pregnant woman’s age increased. It is now believed that 80% of Down syndrome cases occur in pregnant women aged >35 years. Down syndrome screening can not only expand the scope of amniotic fluid examination, but also avoid overlooking pregnant women who may have children with Down syndrome. It is recommended that every pregnant woman must undergo Down syndrome screening to prevent the disease before it occurs. Checking blood cell AFP and HGG can also screen out pregnant women at high risk of neural tube defects, trisomy 18 and trisomy 13.

Generally speaking, the time for Down syndrome screening in early pregnancy is between 11 and 14 weeks of pregnancy, with the best time being between 11 and 12 weeks. The main purpose of Down syndrome screening is to avoid the risk of congenital idiocy in the fetus to a certain extent. The time for Down syndrome screening in mid-pregnancy is between 15 and 20 weeks of pregnancy, and the best time to check is between 16 and 18 weeks.