Before doing non-invasive DNA test, you should pay attention to: 1. Non-invasive DNA test does not require fasting: Non-invasive DNA test requires maternal blood to be drawn. When ordinary people hear that blood test is required, the first thing they think of is fasting.

On the contrary, there is no need to fast when doing non-invasive DNA testing. Pregnant mothers only need to ensure a normal diet.

2. Applicable groups for non-invasive DNA prenatal testing: one of the couple has a history of exposure to teratogenic substances; has abnormal fetal ultrasound examination results; one of the couple is a patient with a chromosomal disease, or a pregnant woman who is pregnant or has given birth to a child with a chromosomal disease; has had a natural pregnancy

Pregnancies with a history of miscarriage, malformed fetus, stillbirth or stillbirth 3. Pay attention to the examination time: non-invasive DNA prenatal testing can be performed at 12 weeks of pregnancy, and 12 weeks to 26 weeks of pregnancy is the entire time period for non-invasive DNA prenatal testing

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If expectant mothers want to have this examination, they must do it during this time period, so as not to affect the examination results and improve the accuracy of the examination.

4. Non-invasive DNA testing is not the same as Down’s syndrome screening: Down’s syndrome screening is only one of the non-invasive DNA tests, which means that non-invasive DNA testing has a wider range, including Down syndrome, Edwards syndrome,

Testing for chromosomal diseases such as Patau syndrome.

Therefore, when pregnant mothers undergo non-invasive DNA testing, they must complete all examination items to ensure the health of the fetus in all aspects.

5. Try to go to a large hospital for examination: Non-invasive DNA genetic testing technology began to enter clinical practice in 2010. It mainly relies on the fetal cells to penetrate into the maternal blood through the placenta and be destroyed by the maternal immune system, and the fetal DNA will remain.

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The accuracy of its test results is as high as 99.70%. High-end technology like this is only available in large hospitals.

6. Generally, there are no specific restrictive requirements such as fasting before performing non-invasive DNA. The general targeted requirements are that the gestational age is within the range of 10 to 20 weeks, there is no history of blood transfusion within 1 to 3 years, and whether the person has diseases related to chromosomal abnormalities, etc.