The main observations of blood routine are leukocytes, hemoglobin, and platelets, as follows: 1. When leukocytes are elevated, it often indicates an inflammatory response, such as when a bacterial infection is present. Leukocytes are also divided into neutrophils, lymphocytes, monocytes, and eosinophils. Neutrophils tend to be elevated when they indicate an inflammatory response, combined with a bacterial infection. When lymphocytes are elevated, they can be seen in pertussis, and in the early stages of novel coronary pneumonia, lymphocytes may be decreased. Elevated eosinophils are often associated with allergic reactions to drugs.2 Decreased hemoglobin suggests anemia.3 Decreased platelets are often seen in diseases such as thrombocytopenic purpura.