Leukocyturia is a pathological condition characterized by a high concentration of leukocytes in the urine. The cause may be urinary tract infections, autoimmune inflammatory diseases of the kidneys. In rare cases, leukocyturia is a sign of oncological pathology or graft rejection. By itself, leukocyturia has no clinical symptoms. Rarely, with a large number of cells, urine can become cloudy. The level of leukocytes is determined in the general analysis of urine, the study of the Nechiporenko, Kakovsky-Addis samples. Correction of this laboratory deviation is carried out in the treatment of the underlying disease.