The blood test refers to the analysis of blood cells in the peripheral blood and their morphology by taking blood from a vein. The five categories are lymphocytes, neutrophils, monocytes, eosinophils, and basophils, and are analyzed separately using flow cytometry. The five categories of blood count report include red blood cell, white blood cell and platelet counts, hemoglobin concentration, the morphology, size and characteristics of red blood cells, and the percentage and count of each of the five categories of white blood cells. The report of the five categories of blood count can determine whether the patient has anemia or thrombocytopenia, whether there is a decrease or abnormal increase in white blood cells, and whether there is an abnormal increase or decrease in any of the five cell categories of white blood cells.