How long is the best time to do Down syndrome screening during pregnancy

Nowadays, people pay more attention to the various prenatal examinations that pregnant women need to do during pregnancy. Pregnant women will take each prenatal examination very seriously. Down syndrome screening is a relatively important examination. Generally, pregnant women can do Down syndrome screening when they are 15 weeks pregnant. It is generally ideal to do Down syndrome screening between 15-20 weeks of pregnancy. Pregnant women should process this examination according to their physical condition.

How long is the best time to do Down syndrome screening during pregnancy

1. The best time for screening is between the 15th and 20th weeks of pregnancy. Generally, pregnant women can get the screening results within one week after blood test. If the result is high-risk, there is no need to panic, because further amniocentesis and fetal chromosome examination are needed to make a clear diagnosis. The Down syndrome screening does not obtain an absolute value but a possibility, that is, the degree of risk of having a child with Down syndrome. Therefore, even if the risk is determined to be low after screening, it cannot absolutely guarantee that the fetus is 100% healthy. But for now, Down syndrome screening is the most advanced and reliable screening method.

2. You must do a Down syndrome screening test during pregnancy. The purpose is to determine the risk level of Down syndrome in the fetus through blood tests. The test can be done between 15 and 20 weeks of pregnancy, but is best done between 16 and 18 weeks.

3. Experts point out that Down syndrome screening can be performed between 15 and 20 weeks of pregnancy, and the best time is between 16 and 18 weeks of pregnancy. Young pregnant mothers under the age of 34 should undergo Down syndrome screening. The birth of Down syndrome children is relatively accidental, so pregnant mothers should be cautious during pregnancy.

4. For pregnant mothers who are over 34 years old, pregnant mothers with Down syndrome in the family, or women who have given birth to children with Down syndrome, these pregnant mothers do not need to undergo Down syndrome screening. At this time, they should directly undergo amniocentesis or chorionic villus sampling.

Reasons for high risk of Down syndrome screening

The main reason for high risk in Down syndrome screening is chromosomal. A woman's primordial germ cells are formed during the fetal period. If pregnancy occurs too late, the eggs are more likely to be polluted by the environment, and the ovarian function begins to decline, making it easy for the egg chromosomes to age, ultimately leading to an increased incidence of teratogenesis.

The proportion of high-risk patients in Down syndrome screening

Generally speaking, older mothers are more likely to have intrauterine growth retardation and premature birth in their fetuses. The incidence of Down syndrome children increases exponentially with the age of the mother. The chance of a woman under 25 having a baby with Down syndrome is about 1/2000, which rises to 1/300 at the age of 35. If she becomes pregnant after the age of 44, the chance of having a baby with Down syndrome is as high as 1/40.