Monocyte
3948.jpg")
![3D Rendering of a Monocyte](/Images/godic/202501/28/Blausen_0649_Monocyte3948.png")
![A scanning electron microscope (SEM) image of normal circulating human blood. One can see red blood cells, several knobby white blood cells including lymphocytes, a monocyte, a neutrophil, and many small disc-shaped platelets.](/Images/godic/202501/28/SEM_blood_cells3948.jpg")
![Reference ranges for blood tests of white blood cells, comparing monocyte amount (shown in green) with other cells.](/Images/godic/202501/28/Reference_ranges_for_blood_tests_-_white_blood_cells3948.png")
Monocytes are a type of white blood cell, or leukocyte. They are the largest type of leukocyte, and differentiate into: macrophages; dendritic cells; and foam cells. As a part of the vertebrate innate immune system monocytes also influence the process of adaptive immunity.