The normal blood leukocytes are 4-10╳10^9/L, commonly as follows: 1. When the leukocytes are elevated to 50╳10^9/L, it is mostly caused by leukemia. When the leukocytes rise to 100╳10^9/L, it is called hyperleukocytic leukemia, at this time the patient is more dangerous and should apply blood cell separator to dilute the blood cells in the blood in time. When the leukocyte elevation reaches 200╳10^9/L, it is called leukocyte stasis, at this time the patient has a life-threatening condition and can die suddenly at any time from respiratory distress, intracranial hemorrhage, hypoxemia, etc. 2. For leukocyte elevation caused by other diseases, it should be observed in conjunction with the condition, generally speaking, when the leukocyte elevation caused by bacterial infection is more than 5 times higher than the normal value, it indicates that the patient has a serious infection. Patients may appear infectious shock and other situations, which are also more dangerous.