A monocyte count of 0.101*10^9/L is low and can be seen in diseases such as anemia and leukemia, or it can be physiologically low. Monocytes are the largest cells in human blood and belong to one of the white blood cell classifications. In normal people, monocyte count is very low, and its absolute value is 0.2~1.0*10^9/L. Therefore, a monocyte count of 0.101*10^9/L belongs to low, not high. Low monocyte count can be seen in megaloblastic anemia, iron deficiency anemia, acute hemorrhagic anemia and many other anemias, but also in leukemia, myelodysplastic syndrome, multiple myeloma and other hematologic malignant diseases. Low monocyte count is one of the manifestations of decreased immunity of the body. The monocyte count in normal body is in dynamic equilibrium, and there may be a temporary decrease, which is physiological and does not need to be treated, and often returns to normal within a short period of time. It is recommended that the patient should go to the hematology department in time, complete the relevant examinations to clarify the cause of the disease and treat the cause.