Monocyte percentage is an indicator of routine blood tests. If the result is slightly low and the patient does not show any discomfort, it is not necessarily clinically meaningful, and the doctor needs to judge whether it is clinically meaningful in conjunction with the patient’s specific symptom performance. Usually, low monocyte percentage is clinically significant in the following diseases: 1, various anemias: such as hemolytic anemia, acute hemorrhagic anemia, megaloblastic anemia, maritime anemia, iron granulocytic anemia, nutritional mixed anemia, aplastic anemia, etc. In addition to the decrease in red blood cells and hematocrit, patients can have a decrease in monocytes, resulting in low percentage. 2, leukemia: patients with leukemia can show a decrease in other types of leukocytes, in addition to elevated leukocytes of one type with more infantile cells, in which monocytes can be reduced and the percentage is low; 3, myelodysplastic syndrome: the bone marrow can show abnormal proliferation of leukocytes, erythrocytes or platelets, in which the abnormal proliferation of one type of leukocytes, the percentage of other types of leukocytes will The percentage of other types of white blood cells will be relatively low, such as the abnormal proliferation of lymphocytes, and monocytes may be low. In addition, late in the course of the disease, a low percentage of complete blood cells can be observed.