Blood tests all include red blood cell count, hemoglobin, white blood cells, white blood cell count classification and platelets. Checking these items is mainly to know whether the patient has an infection or there is some hematologic disorder. An increased red blood cell count is considered to be caused by frequent vomiting, sweating, burns or blood concentration, while a decrease is generally considered to be caused by some acute hemorrhage and other diseases; a significant decrease in hemoglobin is considered to be the appearance of anemia, and the lower the hemoglobin, the more serious the anemia is, and hematocrit below 60g/L should be treated with blood transfusion; a high white blood cell count is considered to be caused by various bacterial infections; Increased platelet count is generally considered to be hemorrhagic thrombocytosis, and decreased is considered to be acute leukemia or hypersplenism.