Did those who underwent the Tang screen test definitely not have a Tang baby?

Patient's question:

No

Doctor's answer:

The results of the Down syndrome screening are only a probability result, with an accuracy rate of only 65%. At that time, being high-risk does not necessarily mean the fetus will have Down syndrome. Moreover, the newborn screening has also passed, so there is no need to worry too much. For Down syndrome, routine screening is not sufficient; a chromosomal test is required, which can be quite troublesome.