A venous whole blood report is the most basic clinical hematology test, which can observe the changes in the number of red blood cells, white blood cells and platelets as well as their morphology and distribution, and is used to determine the disease, and is a common auxiliary test used by doctors to diagnose the disease. For white blood cells, a high neutrophil count suggests an acute purulent bacterial infection, while a high lymphocyte count suggests a possible viral infection. For hemoglobin, a decrease in hemoglobin can be seen in various types of anemia, such as acute and chronic aplastic anemia or iron deficiency anemia. Increased hemoglobin can be seen in hypoxia, hemoconcentration or true erythrocytosis and emphysema. Sometimes platelet counts can be abnormal. A low platelet count may indicate bleeding or an abnormality in blood production. If the platelet count is high, it suggests that blood clots may occur more often. In addition, for eosinophilia, it can sometimes be seen in allergic diseases, such as eczema, asthma, allergies, psoriasis, and some blood tumor diseases.