The normal reference value for white blood cells in adults is (4.0-10.0)*10*9/L. White blood cells in the blood are an indicator of infections in the body. If it is lower than 4.0*10*9/L, it is considered leukopenia, which is mainly seen in bone marrow diseases, bone marrow suppression after chemotherapy, and some viral infections. Higher-than-normal white blood cells are most common in bacterial infections, fungal infections, parasitic infections, etc. Chronic granulocytic leukemia may also have increased white blood cells, in addition to other blood abnormalities. If you find that the white blood cells are lower or higher than normal, it is recommended that you go to the hospital immediately for a professional examination to rule out physiological causes, and if the cause is pathological, you should make timely diagnosis and treatment to avoid delaying your condition.