Known as monocytosis
Chronic infections (e.g., tuberculosis, fungal infection)
Infection within the heart (bacterial endocarditis)
Collagen vascular diseases (e.g., lupus, scleroderma, rheumatoid arthritis, vasculitis)
Inflammatory bowel disease
Monocytic leukemia
Chronic myelomonocytic leukemia
Juvenile myelomonocytic leukemia