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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.
A type of blood cell that is made in the bone marrow and found in the blood and lymph tissue. Leukocytes are part of the bodyâs immune system. They help the body fight infection and other diseases. Types of leukocytes are granulocytes (neutrophils, eosinophils, and basophils), monocytes, and lymphocytes (T cells and B cells). Checking the number of leukocytes in the blood is usually part of a complete blood cell (CBC) test. It may be used to look for conditions such as infection, inflammation, allergies, and leukemia. Also called WBC and white blood cell.