Leukocytes of 20×10^9/L or more are more serious. Leukocytes, as the body’s cells that resist pathogens, can phagocytose and digest invading microorganisms and necrotic cells of the body. Normal value is in (4~10)×10^9/L, different regions and laboratories may have differences, can refer to the local normal value. 1. When the normal value is exceeded, it generally indicates that there is inflammation in the body. 20×10^9/L of leukocytes has significantly exceeded the normal value, suggesting that the inflammation and infection are more serious. 2. Blood system diseases such as acute leukemia and chronic leukemia will also show a significant increase in leukocyte indicators, the situation is more serious, and need to be clearly diagnosed under the guidance of a physician. If the white blood cells 20×10^9/L test results, suggesting that the situation is more serious, it is recommended to consult a doctor in a timely manner, with the help of a doctor to identify the cause of the disease, and targeted treatment or therapy.