The normal range of monocyte percentage is 0.03 to 0.08 (3% to 8%).
Monocytes are the largest white blood cells and participate in the body’s immune defense system. They are derived from hematopoietic stem cells in the bone marrow and have the function of phagocytosis and removal of damaged and aging cells. Monocytes are capable of recognizing and killing tumor cells, and the percentage of the total number of monocytes can be caused to change when inflammation or other diseases occur in the body, so checking the monocyte count can assist in the diagnosis of some diseases.
Monocytosis in adults may be associated with various types of acute infectious or contagious diseases, as well as blood disorders such as leukemia and lymphoma. Infants and children may have a slightly higher monocyte count than adults. A decrease in monocytes is of little significance, as the number of monocytes in the body is inherently low.