Monocyte count refers to the value of monocytes, which is a very important part of human blood cells, it is the largest type of cells in the blood, which can participate in the body’s defense function, remove the body’s injured and aging cells, and can participate in the immune response. Therefore, if there is an increase in monocytes, it can be due to an infection or a blood disease, and also when there is an upper respiratory tract infection, typhoid fever, tuberculosis, malaria and other diseases, it is easy to lead to monocytosis. Mononucleosis, lymphoma and Hodgkin’s disease can also lead to an increase in monocyte count, but in infants and young children it is easy to have a physiological increase in monocyte count, so it is important to be careful to identify it.