Patient's question:
Previously at the hospital, the results of the triple screen test showed trisomy 18 risk, and the doctor recommended an NIPT. The current results show no trisomy, so is this normal? Do I need any further tests?Doctor's answer:
The accuracy of non-invasive DNA is lower than that of Down syndrome screening, but it is more accurate. Non-invasive DNA testing examines three types of chromosomes: Trisomy 21, Trisomy 18, and Trisomy 13. The optimal detection time is between 12 weeks and 22 weeks + 6 days of pregnancy. The accuracy of non-invasive prenatal testing can reach up to 90%, significantly reducing the risk of false positives and missed results from traditional screening, which can cause subsequent psychological trauma. Based on your results, if the non-invasive DNA test shows no abnormalities and low risk, the possibility of the fetus having Down syndrome is relatively small. You can focus on early development and continue with regular prenatal check-ups as needed, so that any issues can be detected and treated promptly.