Abstract
Introduction. According to modern concepts one of the key links in the pathogenesis of urolithiasis is metabolic lithogenic disturbances. The study of the complex effect of many factors on the metabolism of urolithiasis patient is the basis of modern scientific research. We studied the frequency of various chemical urinary stones occurrence depending on various levels of uricuria.
 Materials and methods. Data from of 708 urolithiasis patients (303 men and 405 women) were analized. The results of blood and urine biochemical analysis and chemical composition of urinary stone were studied. The degree of uricuria was ranked by 10 intervals: from 0.4 to 14.8 mmol/day to assess the occurrence of different stones at various levels of uricuria.
 Results. The incidence of calculi consisting of uric acid also increases with increasing levels of uric acid in the urine. An increase in the level of uricuria above 3.11 mmol/day is observed to increase calcium-oxalate stones occurrence. Decrease in the prevalence of carbonatapatite and struvite stones observed at an increase of urine uric acid excretion. At high levels of uric acid excretion, we found uric acid and calcium oxalate stones most often.
 Conclusion. Control over the level of urinary acid excretion in urine is important in case of calcium-oxalate and uric acid urolithiasis.
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