How many white blood cells are above normal may be leukemia, leukemia patients are not diagnosed by how many white blood cells are above normal, but by whether or not the original naive cells in the bone marrow are >20%, if the white blood cells are abnormally high >50×10^9/L, it suggests that the possibility of leukemia is greater. If the leukocyte increase is obvious, but still <50×10^9/L, it is necessary to further identify whether it is leukemia or leukemia-like reaction, then it is necessary to ask the patient's history, such as whether there is a high fever and other clinical manifestations, and at the same time, also need to carry out a bone marrow puncture examination, inflammation index examination to further clarify the diagnosis.