Pyuria is the finding of excessive Leukocytes, also called white blood cells (WBC) in urine during urinalysis (urine test). Pyuria is common in urinary tract diseases like urinary tract infections. Commonly, Pyuria is an indication of a bacterial infection (bacteriuria) that causes inflammatory response of the lining of the urinary tract (urothelium).
Pyuria can often be asymptomatic and is not completely correlated to bacterial infections. Pyuria without bacteria is called "silent" and is cause for suspecting tuberculosis, kidney stones, or cancer.
Pyuria is commonly found during urine tests when too many white blood cells are found in the blood. A test for nitrates that may be present can often help indicate a white blood cell problem. The white blood cells can be found with a urine dipstick test or from microscope examination.
There are many potential problems along the urinary tract and other systems of the body that could potentially cause problems. Pyuria is not a disease or disorder in itself. Instead, it is a finding during examination. Typically, doctors will use the finding of too many or too few white blood cells in order to help them gather clues so they can ultimately make the correct diagnosis.