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White blood cells (WBC, leukocytes)

White blood cells, also called leucocytes, are vital parts of the immune system. They help protect the body against infections and foreign invaders. WBC are round and, if they are granulocytes, granulated. They measure approximately 1.5 to 2 times the diameter of a red blood cell. In urine, the most common type of WBC are neutrophils (i.e. neutrophilic granulocytes), whereas lymphocytes or eosinophils (eosinophilic granulocytes) are rare findings in urine. A small number of WBC can be present in healthy urine but increased counts can point towards inflammation or infection within the urinary system.

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