Neutrophils 1.58, belong to the value of low, the general reference range is (1.80 ~ 6.30) × 10 ⁹ / L, the results of different laboratory tests will be different, not all of the reduction need to play the white injection, neutrophils is a class of white blood cells with phagocytosis, the reduction needs to clarify the etiology of the viral infections, drug treatment, or other disease It is caused by viral infection, drug treatment or other diseases. 1. Viral infection: neutrophil 1.58, value is lower than the reference range, there is no clinically significant risk of infection, can not be used to promote white injection treatment. Combined with the symptoms, it should be clear whether there is a possibility of viral infection. 2. After drug treatment: taking amiodarone, chloramphenicol, methotrexate, phenothiazines, propranolol, cyclophosphamide and other drugs can cause neutropenia, do not need to play the leukocyte injection, usually after stopping the drug for 1 to 3 weeks can return to normal. 3. Other diseases: infectious diseases, blood diseases, autoimmune diseases, hypersplenism and other diseases can cause neutropenia, but at the same time with related clinical symptoms, such as fever, splenomegaly, joint inflammation, etc., the main treatment of the primary disease. Neutropenia should seek medical treatment in time to clarify the cause of the disease, and choose medication under the guidance of the doctor, not self-medication.