Female friends need to frequently go to the hospital for examinations during pregnancy, such as B-ultrasound, Tang screening, etc., which are important examination items. Some pregnant women may experience unsatisfactory results after undergoing Tang screening, and further examination is necessary at this time. So, what is the reason for not passing the Down syndrome screening?
Pregnant women who have not undergone Down syndrome screening are generally caused by chromosomal abnormalities, and when the risk of trisomy 21 and neural tube defects is too high, it can also lead to a failure in Down syndrome screening. At this point, pregnant women should take it seriously and promptly undergo amniocentesis or non-invasive DNA testing.
Not passing the Down syndrome screening does not necessarily mean there is a problem with the fetus, as Down syndrome screening cannot provide accurate results and can only detect the probability of abnormalities in the fetus. So when the Tang screening result does not pass, don't worry too much, you should arrange the next inspection in a timely manner.
When pregnant women undergo Down syndrome screening, blood will be drawn and tested for alpha fetoprotein, chorionic gonadotropin, and free estriol in the blood. Doctors will also comprehensively calculate the risk of congenital defects in the fetus based on factors such as the age, weight, and whether the pregnant woman has any diseases. If the result of Down syndrome screening shows high risk, it means that the likelihood of the fetus suffering from Down syndrome is relatively high.
