What should I do if I do Down's screening and the result is a high-risk group?

Tang sieve is a reference value according to the gestational age, age, weight and hormone level of pregnant women. The accuracy rate is only about 60% to 80%. High risk does not necessarily mean that there must be a problem. If you are not at ease, you can make a further diagnosis. Noninvasive or sheep puncture is a little risky. It is suggested to consider non-invasive prenatal genetic testing.