White blood cells 2.7 × 10⁹ / L, is a low white blood cells, can be caused by leukemia, but more common in other diseases, and can not be concluded from this test. The normal value of white blood cells ranges from (4 to 10) × 10⁹ / L, below 4 × 10⁹ / L can be called leukopenia, which can be caused by leukemia, but most of them are caused by other diseases. 1. Clinical leukopenia can be seen in gram-negative bacillus or viral infections, aplastic anemia, megaloblastic anemia, hypersplenism, severe liver disease, systemic lupus erythematosus, non-leukocyte leukemia and so on. 2. To confirm the diagnosis of leukemia, it is necessary to further improve the bone marrow aspiration and other specialized tests. So we see that there are many diseases that can cause leukopenia. To determine whether it is leukemia, it is necessary to combine the patient’s clinical manifestations and conduct further examination, which requires the help of professional doctors. In summary, the total number of white blood cells 2.7×10⁹/L suggests a decrease in the total number of white blood cells, but it is not possible to conclude from this examination that it is leukemia, if such a situation occurs, it is recommended to consult a doctor in time and make a clear diagnosis under the guidance of a physician.