Monocyte absolute value of 0.9 is beyond the normal range, this situation has physiological high and pathologically high, only according to the number of monocytes can not judge the severity, should be based on the specific condition to determine the severity or not. Monocyte is a kind of white blood cell, the absolute value is 0.12～0.8, 0.9 is beyond the normal value. Normal children’s monocytes are higher than adults, and this is a physiologic increase, which is normal. While monocytes pathologically increased in certain infections, such as malaria, tuberculosis, infective endocarditis, etc.; blood diseases, such as monocytic leukemia; acute infectious diseases or acute infections in the recovery period. Malaria, tuberculosis, and infective endocarditis can be treated with medications and have a better prognosis and are not considered serious. However, mononuclear cell leukemia is more serious and requires active treatment. Whether the disease is serious or not is not judged by the number of monocytes, this situation can be further examination to clarify the cause of the disease.