Non-invasive, also known as non-invasive DNA, does not require fasting for non-invasive DNA and eating or drinking will not affect the results of the test. Non-invasive DNA is a test to detect whether the fetus has genetic defects and chromosomal disorders. Pregnant mothers can go to the hospital to have peripheral venous blood drawn in the time period of 12~22+6 weeks of pregnancy to extract free DNA and use sequencing technology of high-throughput DNA to diagnose chromosomal abnormalities and gene mutations. This test is not affected by diet unlike other biochemical tests such as liver and kidney function and blood sugar. Because the DNA content of maternal peripheral blood is relatively fixed and is not affected by eating or drinking, there is no need for fasting before the test. Therefore, pregnant mothers do not need to worry too much about the impact of eating on the non-invasive DNA test results. Women are advised to consult with the hospital before doing NDNA, not all pregnant mothers need to do NDNA.