Pathology dictionary -


A leukocyte is a type of cell and part of the immune system. Another name for a leukocyte is white blood cell (WBC). Immune cells are responsible for protecting our body from infections and for helping us heal after an injury.


It is normal for a pathologist to see leukocytes under the microscope in both normal tissue and after an injury or during an infection.


Routine blood tests count the number of white blood cells in your blood. Infection, injury, and physical stress can also cause the number of white blood cells in your blood to increase.  

The immune system is made up of different kinds of leukocytes and each has a different role to play.

Types of leukocytes include: 

  • Lymphocytes

  • Plasma cells

  • Neutrophils

  • Eosinophils

  • Histiocytes

  • Macrophages

  • Natural killer cells 

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