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Forty eight cases of urinary stone, which were collected from the patients, were admitted to the Department of Urology, Korea University Hospital during the period from Feb. 1971 to Aug. 1971. The experimental urinary stones were tested with serological absorption test and the following results were obtained. 1) In 43 of the 48 cases observed, blood group specific substances were detected, and were agreed with: blood group of observed patients. 2) In 5 of the 48 cases observed, blood group specific substances were not detected. cases were weighed below 0.03 gm. 3) The reaction titer of blood group specific substance in urolithiasis was become higher in proportion to the increase in size and weight of them. 4) There was no significant difference of reaction titer of blood group specific substance between the nucleus and cortex of the experimental urolithiasis. 5) Calcium oxalate stones were noted with highest reaction titer of blood group specific substance among the other chemical composition of the experimental urolithiasis. 6) Renal stones were noted with highest reaction titer of blood group specific substance, bladder stones the next and ureteral stones had the least titer in the experimental urolithiasis.
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