The non-invasive DNA test does not require fasting. Noninvasive DNA is a test for fetal neural tube malformations, including trisomy 21, trisomy 18 and open neural tube malformations. It requires the extraction of blood from a peripheral vein of the pregnant woman and is performed using medical technology to determine if the fetus has a congenital disorder. Non-invasive DNA is a direct extraction of fetal DNA and is not a biochemical test, so fasting is not required for non-invasive DNA testing. In addition, non-invasive DNA test is recommended to be carried out around 20 weeks of pregnancy, and 3-5 days before the test, you need to eat a light diet, and reduce the intake of high-fat, high-purine, high-protein food, so as not to affect the results of the blood samples, and the specific need to comply with the doctor’s instructions.