Routine blood test results in patients with sepsis can reflect the extent of their infection. Generally, the blood picture of patients with sepsis is not normal, and the normal white blood cells range from (4-10)×10^9/L, i.e., 4,000-10,000/mm^3. However, the blood picture of most of the patients is high, and the results of the tests generally indicate that the white blood cells are >10,000/mm^3, and the white blood cells of some of the patients may be >20,000-30,000/mm^3, and the neutrophil ratio is obviously elevated, and basically the patients are >85%. 30,000/mm^3, and the patients’ neutrophil ratio is obviously elevated, basically >85%. However, in some patients with severe infections, the white blood cells did not increase, but rather decreased, and may be <4000/mm^3, i.e. <4×10^9/L. Because severe infections can lead to bone marrow suppression, causing a decrease in the hematopoietic function of the bone marrow, the white blood cells of these patients were <4000/ul, but the neutrophil ratio of these patients was still higher, and the infection indexes of the patients, such as CRP and PCT, were all higher than those of the patients. However, the percentage of neutrophils is still high, and the patients' CRP, PCT and other indicators of infection are high. Most patients with sepsis do not have a normal blood picture, most of them have elevated leukocytes, but some of them have decreased leukocytes.