Down syndrome screening 21-trisomy syndrome critical risk

Patient's question:

Just received the Down syndrome screening report for gestational week 15. Age: 30; Trisomy 21: 1/332 (borderline risk); Trisomy 18: 1/12138; Neural tube defects

Doctor's answer:

Analysis of the condition: Hello, if the Down syndrome screening shows a critical risk, it is best to undergo amniocentesis and umbilical cord blood sampling for further confirmation of whether it is a Down syndrome child.
Suggestions:
1. Down syndrome screening is only a risk assessment method, not a diagnostic one.
2. You can also have a detailed 4D ultrasound at 24-28 weeks of pregnancy to further assess the possibility of a Down syndrome child.