2. Blood collection does not need an empty stomach, and there is no need to check in advance, as long as you have a normal diet and a regular schedule.
3. The better time for non-invasive DNA detection of pregnant women is 12- 24 weeks after pregnancy.
Applicable people:
1. Older pregnant women (over 35 years old) who are unwilling to choose invasive prenatal diagnosis;
2.？ Tang screening results are high-risk or single index values change, and pregnant women who are unwilling to choose invasive prenatal diagnosis;
3. Pregnant women who are unwilling to choose invasive prenatal diagnosis because of the increase of fetal nt value or other anatomical abnormalities during pregnancy;
4. Pregnant women who are not suitable for invasive prenatal diagnosis, such as virus carriers, placenta previa, low placenta, oligohydramnios, RH blood group negative, abortion history, threatened abortion or baby;
5.？ Pregnant women who have not received amniocentesis cell culture and are unwilling or unable to undergo invasive prenatal diagnosis again;
We hope to exclude fetal 2 1 trisomy, 18 trisomy and1trisomy syndrome, and voluntarily choose pregnant women for non-invasive prenatal testing.
6. Pregnant women with positive serum screening and pregnant women with psychological disorders in prenatal diagnosis;
Every couple is at risk of having children with chromosomal diseases. Its occurrence is accidental and random, without warning beforehand, family history and clear toxic contact history, and the incidence rate increases with the age of pregnant women. At present, there is no effective means to treat chromosome diseases.