White blood cells 15 × 10⁹ / L belong to the phenomenon of high, serious or not should be combined with other tests to confirm the diagnosis. The normal range of white blood cells is in (4~10)×10⁹/L, white blood cells 15×10⁹/L belongs to the phenomenon of high, but should be combined with the specific symptoms and related examinations to determine the comprehensive. 1. If there is only a slight fever and no other systemic toxic symptoms, most of them are considered bacterial infection. If the white blood cell count reaches 15×10⁹/L, and there are systemic symptoms of toxicity, such as chills, chills, high fever, and mental lethargy, it often suggests that the condition is more serious, and there is a possibility of multiple organ failure. Therapeutic drugs include levofloxacin and so on. 2. Acute leukemia, myelodysplastic syndromes and other malignant hematological disorders may also show elevated white blood cells, which are more serious and need to be examined by bone marrow aspiration to make a clear diagnosis. If the white blood cells are elevated and accompanied by other symptoms, it is recommended to consult the hospital in time, complete the relevant examinations, and carry out targeted treatment and therapy after clarifying the cause of the disease. The above medications should be used in a standardized and rational manner under the guidance of professional physicians and pharmacists.