The blood draw to check folate metabolism does not require fasting. The test to check folate metabolism is medically known as the MTHFR genetic test. As the name suggests, it is a genetic test. The results of the gene within the blood are not affected by diet, so fasting is not required. Medically, there are some tests that require fasting because they are affected by diet, such as liver function, blood sugar, and electrolytes. Folic acid genetic testing can guide pregnant women on the appropriate dose of folic acid supplementation in preparation for pregnancy as well as at various stages of pregnancy. Mothers-to-be need to start taking oral folic acid tablets as early as 3 months before preparation for pregnancy. If the folic acid metabolism is normal, a daily supplement of 0.4mg is sufficient. However, if there is a folic acid metabolism disorder, you need to take more folic acid according to the results of the MTHFR gene test. Fasting is not required for blood sampling to check folic acid gene metabolism. Normally, we can eat foods containing folic acid, such as animal liver, soybean products, spinach, red amaranth, and so on.