The literal translation of the term "pyuria (leukocyturia)" is "pus in the urine" (Greek pyos - pus, urоs - urine). The true meaning of the term "pyuria" is acquired in patients with pyonephrosis, when antegrade voluntary drainage into the bladder occurs. Pyuria is evidence that an acute inflammatory process is developing in the genitourinary system - cystitis, pyelonephritis, prostatitis, pyonephrosis and other diseases.