Noninvasive DNA should be done at gestational age 12-26, sooner rather than later. Less than 12 gestational weeks, more pregnant women may have insufficient free fetal DNA in peripheral blood, and need to take blood tests again.

If you are pregnant for more than 26 weeks, there will be no time to deal with it in case of positive non-invasive DNA results; It is forbidden to terminate pregnancy after more than 26 weeks of pregnancy.

Do non-invasive DNA, you don't need an empty stomach, you can eat normally. Non-invasive DNA is to sequence the free fetal DNA genetic material by extracting the peripheral blood of pregnant women (venous blood is about 10ml), which is not affected by diet like the usual blood test. (Please explain with the testing agency when taking drugs. )