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The exact analysis of urinary calculi is very important to study of the etiology of calculus formation, prevention of recurrence and medical treatment. Compared with all the other method, the infrared spectroscopic analysis furnished a permanent record in a very short time. And it is ideal method for qualitative identification and semiquantitative estimation of small fractions of calculi by simple procedure rapidly. A retrospective review of stone analysis by infrared spectroscopy, with KBr tablet method was performed in 105 cases of 219 urinary stone patients, who had been admitted to the Fatima Hospital from May, 1980 to December, 1983. And the following results were obtained 1. Mixed calculus is more than single calculus(1 : 1.56) . The most common type of calculi is calcium oxalatetribasic calcium phosphate (47.6%) . And the most common type of single calculi is calcium oxalate (29.5%) . 2. The most common type of component is calcium oxalate (55.6%) 3. Calcium oxalate-tribasic calcium phosphate is the most common type in the renal (46.2%) and the ureteral stones (53%) . But in the bladder stones, magnesium ammonium phosphate is the most ( 33.3%). 4. Among the 10 laminated stones, 4 cases contain the different components in nucleus and outermost layer 5. Pyuria is observed in 48.6% of all urinary stone patients, in 32.3% of calcium oxalate stone and in more than 80% of magnesium ammonium phosphate stone. 6. Calcium oxalate stone is most common in the age of 20, calcium oxalate-tribasic calcium phosphate stone are in the age of 20 & 30, and magnesium ammonium phosphate stone is above the age of 40.
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