The normal value of blood picture refers to the normal value of blood routine, the average level of lower limit of normal value of hemoglobin is 120g/L, if it is lower than 120g/L is called anemia, which is divided into three stages. 90-120g/L is called mild anemia, 60-90g/L is called moderate anemia, and lower than 60g/L is called severe anemia. While the white blood cell count may vary slightly from hospital to hospital or testing facility, the lower limit of normal value is approximately (3.5-4.0) × 10^9/L order of magnitude, and less than this order of magnitude is called leukopenia. The upper limit of normal value of leukocyte count is 10×10^9/L, and higher than the upper limit of normal value is called leukocytosis. The lower limit of the normal value for platelets is about 100 x 10^9/L, below which it is called thrombocytopenia. Patients with leukemia are usually the first to present with an abnormal white blood cell count. If a white blood cell count of >10×10^9/L order of magnitude is present, it is necessary to first observe for cells with an abnormal phenotype or abnormal morphology by means of a peripheral blood smear and after microscopic staining. Once abnormal cells are found, the patient needs to be informed to complete a bone marrow aspiration as soon as possible to determine whether the patient has a predisposition to malignant leukemia.