Leukocyte 2.7 in the test refers to a white blood cell value of 2.7 x 10^9/L, which is often found in the results of blood tests. For healthy people, the value of leukocytes is in the range of (4-10)×10^9/L, and therefore, it can be clinically judged to be below the normal range. Leukocytes of 2.7×10^9/L do not exclude the possibility of leukemia, but this value alone does not confirm the diagnosis and needs to be combined with the patient’s specific symptoms and relevant tests to clarify the presence or absence of leukemia. If the patient also has nosebleeds, bleeding gums, fever, joint pain and other symptoms associated with leukemia, the patient should also have a bone marrow picture and cytochemical examination to clarify the condition. Clinically, leukocytes are divided into five categories: neutrophils, eosinophils, basophils, monocytes and lymphocytes. Therefore, in addition to leukemia, a test result of 2.7×10^9/L leukocytes may also be due to bacterial and viral infections in the organism. After anti-infection treatment for such patients, the leukocyte values will also return to normal levels, and there is no need to worry too much; 2. Before the blood test, some patients with systemic diseases taking drugs, such as hyperthyroidism patients after taking atenolol, metoprolol, methimazole and other drugs, as well as after radiotherapy chemotherapy and the use of sulfonamides, may cause a decrease in leukocyte values; 3. It may be pseudo This is due to a large number of leukocytes clinging to the walls of blood vessels, so the results in the blood test may be biased. This type of condition occurs in immunocompromised groups, and patients often have dizziness, fatigue, insomnia, etc., but it is not a pathological decrease in white blood cells.