Is it necessary to do Down syndrome screening twice?

Down syndrome screening is an indispensable item in pre-pregnancy physical examination. This type of test can determine in advance whether the fetal position is likely to have Down syndrome, thereby reducing the occurrence of fetal malformations. It can be called an important test in pre-pregnancy physical examinations. So, is it necessary to do Down syndrome screening twice?

Is it necessary to do Down syndrome screening twice?

Whether Down syndrome screening needs to be done twice depends on the detailed situation of the pregnant woman. There is no requirement for the actual frequency. Down screening is the general name for prenatal selection tests for Down syndrome. The purpose is to test the blood of pregnant women, test the concentrations of alpha-fetoprotein, human gonadotropin and free estriol in the blood cells of pregnant women, and combine the age, weight, and weeks of pregnancy of the pregnant women to determine the risk of congenital idiocy and neural tube defects in the fetus.

Down syndrome screening is a test method that extracts blood cells from pregnant women, tests the concentration of fetal alpha protein and human gonadotropin in the mother's blood cells, and calculates the risk of having a child with Down syndrome based on the pregnant woman's due date, age, weight and weeks of gestation when the blood is drawn.

The best time to do Down syndrome screening is between 15 and 20 weeks of pregnancy. Doctors recommend that Down syndrome screening should be done at 15-20 weeks, but each testing hospital has different conditions, so the actual time for Down syndrome screening should be announced by the hospital. This step can predict the possibility of a child being born stupid based on the test. The main purpose of Down syndrome screening is to avoid the risk of congenital malformation in the fetus to a certain extent. Generally, pregnant women can get the screening results within one week after the blood test. If the result is high risk, there is no need to panic, because further amniocentesis and fetal chromosome examination are required to confirm the diagnosis.

The above is the knowledge about Down syndrome screening that I have introduced to everyone. There is no specific frequency requirement for Down syndrome screening, and it depends on the physical condition of the pregnant woman. Generally speaking, 15-20 weeks of pregnancy is the best time to do Down syndrome screening, so pregnant women should try to choose this time range for examination.