2. What Do White Blood Cells Do?

A diagnosis of pancytopenia also depends on the blood having too few white blood cells, the units that protect the body from infection. There are two types: neutrophils provide an immediate response, while lymphocytes directly attack infections and produce antibodies that target specific bacteria and viruses. The body needs an adequate amount of both to maintain a healthy immune system.

White Blood Cells Henrik5000 / Getty Images


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