In general, do not eat or drink before the blood test, because eating and drinking before the blood test may interfere with the clinical results, for example, if you eat or drink before the blood test, there are two adverse effects. For example, if you eat or drink before the blood test, there are two adverse effects. After eating, there may be a mild increase in the number of white blood cells, which may interfere with the clinical results. At the same time, if a large amount of water is consumed before the blood is drawn, the blood is diluted and the hemoglobin concentration may decrease, which may lead to a judgment that the patient is anemic and may also have a misjudging effect on the clinical results. If you eat or drink water before the liver test, the concentration of transaminases in the liver test may be mildly increased, which also has a significant interfering effect on the clinical results, so do not eat or drink water before the blood test.