If you have to take a blood test only, you can eat lighter and less oily food. If the blood is drawn to check other items, such as liver and kidney function, then fasting is required.1. Only for the Down screening test: In the Down screening test, the levels of alpha-fetoprotein, free HCG and free estriol need to be evaluated, and whether or not fasting has little effect on these three indicators, but it is necessary to avoid eating excessive high-fat food and overeating to avoid errors in the results due to high blood lipids when separating the serum. Therefore, you can eat a small amount of light food when you only have the Down screening test. Of course, some doctors will advise pregnant women to try to check on an empty stomach; 2, check other items at the same time: the Down screening test is a routine item in the maternity checkup, usually the maternity checkup can do a number of tests after a blood sampling, such as blood sampling also test liver function, kidney function, blood lipids, etc., need to strictly fasting. With the improvement of medical level and service, you can call the hospital you made an appointment with before the maternity checkup to confirm whether you need to fast strictly before the checkup.