If the white blood cells are significantly elevated, it means there is inflammation in the body; if the hemoglobin is significantly lower, it means there is anemia in the body; if the fasting blood sugar is ≥7.0mmol/L, it can be diagnosed as diabetes. Cholesterol, triglycerides, LDL and HDL are also checked. If cholesterol and LDL are significantly elevated, the risk of atherosclerosis should be noted. In addition, blood will also be drawn for electrolytes, such as potassium, sodium, and chloride, and if hypokalemia exists, it can have a significant impact on human health.