Analysis of Urinary Stone Components during the Last Two Decades

Purpose: The accurate analysis of urinary stone components is funda-mental for studying of the etiology of stone formation and it is essential for the treatment of urinary stone and its prevention. We compared the analysis of urinary stone components during the last two decades. Materials and Methods: Stone analysis was performed by Louis C. Herring and Company. The urinary stones were aobtained from January, 1986 to December, 2005. We compared the stone components of the first decade (Group A, 301 cases) with that of the second decade (Group B, 158 cases). Results: The mean age was 47.2±14.5 in Group A and 46.0±10.2 in Group B (p=0.658). The ratio of males to females was 2.04:1 in Group A and 1.98:1 in Group B (p=0.888). Ureteral stones were the most common stones in both groups. Among all the components analyzed in Group A, calcium oxalate made up 73.1 % of the total. Other components found in the stones were uric acid 12.3%, calcium phosphate 8.3%, magnesium ammonium 5.3%, ammonium acid urate 0.7 % and cystine 0.3%. In Group B, calcium