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Most of methods which have been used for analyses of urinary calculi are qualitative and few quantitative studies have been reported with chemical analysis or optic crystallography. We report the results of the quantitative and qualitative analysis of urinary calculi which managed at Severance hospital during last 2 years. Methods which were used in this studies were based on the chemical analyses of inorganic materials or organic substances and little attempt was made to relate the stone composition to other parameters such as clinical history of the patient or the composition of the urine. The results are followings: 1..According to Jensen`s classification of urinary calculi, oxalate or phosphoxalate stones were 46.4%, calcium phosphate or ammonium phosphate stones were 42.1% and uric acid stones were 6.4%. 2.Only one compositional stones were 52.6%, which were calcium phosphate in 24.2%, ammonium phosphate in 13.7% and calcium oxalate in 8.4% in order, and mixed stones were 47.4%, which were calcium phosphate oxalate in 30.5%. 3.Pure stones in oxalate group were 8.4% and its quantity was 58.5 gm%. Mixed stones in oxalate group were 38%, and so oxalate stone has more tendency to form mixed type than phosphate group. Eighty nine percent of mixed type was that of phosphate oxalate and at this time phosphate was greater than oxalate in quantity. 4. Pure stones in phosphate group were 37.9%, which were calcium phosphate in 24.2%, ammonium phosphate in 13.7% and its quantity was 75 gm%. Stones in phosphate group have less tendency to form mixed type and its quantity was variable. 5. All most uric acid stones were pure stones and its quantity was high. 6. There were 3 carbonate stones and its quantity was high, but only one cystine stone had low quantity.
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