Fasting is not required for non-invasive DNA during pregnancy. Non-invasive DNA test is mainly extracted from the mother’s peripheral blood free of fetal DNA, so generally do not require fasting, after eating blood will not affect the diagnostic results of non-invasive DNA, and will not be subjected to any interference, so pregnant women checking the non-invasive DNA do not need to fasting. However, some pregnant women after non-invasive DNA may indicate abnormalities and find that there is a high risk of chromosomal presence, this situation requires the next step of the examination, including weight, progesterone test and some routine physical examination, these checkups may require fasting. It is recommended to consult your doctor before having a non-invasive DNA test during pregnancy to understand the precautions to be taken before and after the test, and to operate under the guidance of a medical professional.