How many months of pregnancy

summary

Down's screening refers to taking blood from pregnant women, testing the content of AFP and hCG in the serum of pregnant women, combined with the age, weight and gestational weeks of pregnant women to determine the risk of fetal Down's syndrome. Moreover, the best time to do down's screening is in the 15-20 weeks of pregnancy, early or late can achieve accurate test results, so every pregnant mother should grasp the time when preparing to do down's screening. Pregnancy a few months, check to tell you.

How many months of pregnancy

First: Down's screening is to screen whether the fetus has Down's syndrome. In general, we recommend to do it at 15-20 weeks of pregnancy, that is, about 4 months. Down's screening is generally necessary for elderly pregnant women.

Second: at present, the Tang screening test is to test the concentration of alpha fetoprotein (AFP) and human chorionic gonadotropin (β - hCG) in the blood of pregnant women, and use the computer to calculate the risk of each pregnant woman with Down's syndrome fetus.

Third: the normal value of alpha fetoprotein should be greater than 2.5 mm. The lower the test value is, the higher the chance of Down's disease is. The higher the level of hCG, the higher the chance of Down's syndrome.

matters needing attention

The doctor will also input the alpha fetoprotein value, chorionic gonadotropin value, as well as the age, weight and gestational weeks of the pregnant woman into the computer, and the computer will calculate the risk of Down's disease in the fetus. If the test results show that the risk is lower than 1 / 270, it means that the risk is relatively low, and the chance of Down's disease in the fetus is less than 1%. However, if the risk is higher than 1 / 270, it means that the risk of fetal disease is higher, and further amniocentesis or chorionic villus examination should be done.