What Are the Causes of White Blood Cells in Urine?
White blood cells are the specialized cells in the blood responsible for fighting infections and providing the body with immunity. The kidneys filter about 200 quarts of blood a day, according to The National Kidney and Urologic Diseases Information Clearinghouse, to separate the waste and excess fluids from the blood. Normal, healthy urine does not contain white blood cells. However, certain conditions may cause white blood cells in urine.