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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 are an important component of blood and a key player in the body's immune system. A diagram showing different types of leukocytes, or white blood cells.Leukocytes are also known as white blood cells.Macrophages promote tissue growth and repair following an injury.eukocytes are an important component of blood and a key player in the body's immune system. A diagram showing different types of leukocytes, or white blood cells. Leukocytes are also known as white blood cells. Macrophages promote tissue growth and repair following an injury.