Nowadays, many pregnant women choose to undergo Down syndrome screening at 20 weeks of pregnancy to ensure that their child is developing healthily. For those who miss the Down syndrome screening, it is recommended to undergo non-invasive testing. Many people are not familiar with these professional terms, but in fact, there are differences between these two tests. So let's take a look at which one is more accurate, Tang Screen or Non Invasive!
Both Tang screening and non-invasive examination methods detect the venous blood of pregnant women, but the diseases detected are different, so their accuracy varies. The items examined by Tang screening include trisomy 18, trisomy 21, and open spina bifida. The non-invasive examination items include trisomy 18, trisomy 21, and trisomy 13, and the accuracy of this non-invasive examination method is relatively high compared to Tang screening.
If we compare the accuracy of the two, the accuracy of Tang sieve can reach 60% to 70%, and the non-invasive accuracy can reach over 95% to 98% on the 21 trisomy. The accuracy of the 13 trisomy can also reach over 80%, and the accuracy of the 18 trisomy inspection can reach over 90%. Usually, there are many people who undergo Down syndrome testing. Only those who miss the Down syndrome screening and encounter special circumstances will be recommended to undergo non-invasive testing.
Besides the difference in accuracy, there is also a significant price difference between Tangxi and Nonchuang. Under normal circumstances, if the patient is not an elderly mother or has hereditary Down syndrome, a Down syndrome screening is sufficient. If the family situation is good, non-invasive treatment can also be done directly because its accuracy is relatively high, and parents can feel more at ease.
