Adult white blood cells 28,000/μl can not be clear whether it is serious or not, it is necessary to combine with other indicators, the specific cause of the disease in order to determine the degree of severity. Such as infections, blood system diseases, etc. 1. The normal reference range of white blood cells in adults is 4000~10000/μl or (4~10)×10^9/L. When the white blood cells are 28000/μl, that is, the white blood cells are elevated, which is commonly seen in infectious diseases, such as tonsillitis, etc. Usually, the white blood cells will drop after active anti-infective treatment (levofloxacin), and the condition is relatively mild. 2. Elevated white blood cells can also be seen in acute leukemia, chronic leukemia, myelofibrosis and other early malignant diseases. When these diseases occur, the condition is relatively serious. Need to be timely targeted treatment, such as acute myeloid leukemia to be cytarabine chemotherapy. Elevated white blood cells are also related to other causes, the severity of which varies, it is recommended that further examination under the guidance of a doctor to determine the cause of the disease standardized treatment, so as not to delay the condition.