Down syndrome screening is typically conducted around five months of pregnancy, but the accuracy of the test may be affected after 20 weeks. For pregnant women with Down syndrome, in addition to timely treatment, it is important to consult experts frequently, maintain communication with doctors, and pay attention to daily care and choose authoritative hospitals for treatment. As for allergic rhinitis and anemia issues, these are common symptoms during pregnancy and usually have no direct impact on the fetus. However, to ensure the health of both mother and child, it is recommended that you discuss the management of these symptoms with your doctor and adjust your lifestyle or receive appropriate treatment based on their advice.

Explains the possible causes of fetal abnormalities and how to conduct prenatal exams to determine if a fetus has abnormalities.

What tests do pregnant women need to undergo in their third month?

Down syndrome screening is generally done once, with the optimal time being between 15 to 20 weeks of pregnancy. If the screening results indicate a higher risk, further diagnostic tests such as amniocentesis or non-invasive prenatal testing (NIPT) may be recommended for confirmation.

When is it most appropriate to perform a Down syndrome screening during pregnancy?