The article presents the results of comparative urine studies of patients with pyelonephritis and patients without signs of UTI. The results of bacterioscopic and bacteriological examination of urine of 69 patients with pyelonephritis and 27 without UTI were analyzed. A high prevalence of negative urine culture in pyelonephritis (59.4 %) was revealed, as well as the prevalence of negative culture in the presence of bacteriuria detected microscopically in urine sediment (37.5 %). In patients without pyelonephritis, a bacteriological study showed bacterial growth in 66.7 % of cases, which indicates the revalence of asymptomatic bacteriuria in urological patients. Literature data on diagnostic problems and possible causes of false negative results of bacteriological examination in UTI are analyzed. One of the reasons for these results are the disadvantages and limitations of standard bacteriological culture. The need to introduce new advanced methods of bacteriological research into clinical practice is urgent.
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