Since some leukemia patients have no obvious abnormalities in blood routine, it is possible that leukemia may not be detected by blood routine, which is not a criterion for leukemia diagnosis. 1. Routine blood test is the most basic test for leukemia patients, and also belongs to the early screening of leukemia as a major means. Any significant increase or decrease in white blood cells, abnormal white blood cell classification, increase or decrease in red blood cells, increase or decrease in platelets, etc. in the routine blood test suggests that the blood system may have problems. 2. The white blood cells, red blood cells and platelets in the blood routine of leukemia patients will also change, but the blood routine of some leukemia patients can also be normal, such as in acute lymphoblastic leukemia, the blood routine of some patients is normal. Therefore, leukemia patients can not necessarily be detected by routine blood tests. Leukemia can be clearly diagnosed by bone marrow examination. If the results of routine blood tests are abnormal, it is recommended to consult a doctor in time to identify the cause of the disease and carry out targeted treatment or therapy.