1, pregnant women with habitual abortion, generally this kind of pregnant women have a history of abortion, it is not recommended to do sheep piercing, which increases the probability of abortion.
2, older women, pregnant women over 35 years old, have a greater chance of giving birth to Down's children!
3, Tang screening high-risk pregnant women, Tang screening high-risk pregnant women should pay special attention, non-invasive DNA is very necessary (according to the doctor's advice).
4, precious children, especially precious fetuses, are hard to come by, and it is recommended to do non-invasive DNA.
5, pregnant women's psychological pressure is too great, generally pregnant women will be afraid of sheep wear, too much pressure, mental tension, which is not conducive to fetal growth and development, it is recommended to do non-invasive, the accuracy rate is also very high 99%.