During routine blood tests, the classification and count of white blood cells can be checked. Leukocytes include neutrophils, eosinophils, basophils, lymphocytes and monocytes, and neutrophils are subdivided into rod-shaped nuclei and lobulated nuclei. The absolute value of neutrophil rod-shaped nuclei is (0.04-0.5)x10^9/L, accounting for 0%-5% of total leukocytes. The absolute value of neutrophil lobulated nuclei is (2-7)x10^9/L, accounting for 50%-70% of total leukocytes. Absolute eosinophils (0.05-0.5)x10^9/L, 0.5%-5% of total leukocytes. Absolute values of basophils (0-0.1)x10^9/L, accounting for 0%-1% of total leukocytes. Absolute value of lymphocytes (0.8-4)x10^9/L, accounting for 20%-40% of total leukocytes. Absolute value of monocytes (0.12-0.8)x10^9/L, 3%-8% of total leukocytes.