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Leukocytes are a type of white blood cell. When urine is positive for leukocytes, there are leukocytes in the urine. White blood cells in urine are typically a sign of infection.urpose. Leukocytes are white blood cells, the body's defense mechanism against invaders such as infection and disease. When foreign materials enter the body, white blood cells attack it by destroying infectious agents or producing antibodies.
Leukocytes, or white blood cells, play an important role in the immune system. They are produced in the bone marrow and released into the blood when they become mature. There are several types of leukocytes, with functions ranging from protection against infection by microorganisms to protection against tumors and parasites. Leukocytes also play a major role in inflammation and allergic reactions.