Background. We have previously shown that nitrogenous metabolites have immunomodulatory effects in healthy rats and humans as well as in patients with encephalopatia. The purpose of this study is their immunotropic activity in patients with chronic pyelonephritis. Materials and Methods. The object of observation were 24 men (aged 23-76 years) with chronic pyelonephritis in remission. The plasma levels and urinary excretion of uric acid, urea and creatinine and parameters of immunity twice (on admission and after 10 days of balneotherapy at the Truskavets’ Spa) was performed. Results. Judging by the multiple correlation coefficient uricemia exhibits maximal immunotropic activity (R=0,772), followed by creatininemia (R=0,643), urea plasma (R=...