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The analysis of composition in urinary stone plays an important role for its treatment. The infrared spectroscopy was used for analysis of urinary stones on 121 cases durirng the period from March 1975 to February 1980 in this hospital. The purpose of this study is to analyze the composition of urinary stones and the character of the stone in nucleus and outcoat. The results obtained in this study are as follows: 1. In the 121 cases, the mixed stones are 66.9% and single stones are 33.1%, The composition of the urinary stone shows calcium oxalate-dibasic calcium phosphate in 55.6% and calcium oxalate-magnesium ammonium phosphate in 24.7% for the mixed stone. And the single stone shows 85.2% in calcium oxalate, 15.0% in magnesium ammonium phosphate for the composition. 2. The compounds of calcium oxalate-dibasic calcium phosphate show 44.4% in kidney, 37.3% in ureter and 33.3% in bladder. The compounds of magnesium ammonium phosphate are found in the bladder as 22.2%. 5.6% in the kidney, 1.2% in the ureter. 3. In the composition of 6 staghorn calculi, the calcium oxalate was found in 2 cases, the calcium oxalate-dibasic calciun phosphate in the another 2 cases, the magnesium ammonium phosphate, the magnesium ammonium phosphate-calcium carbonate in the each one case. 4. In the most of large stones in 121 cases, the compositions of nucleus were the compound of calcium oxalate and outcoats were the compound of dibasic calcium phosphate.
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