We present in this paper quantitative chemical analyses of twenty-five renal calculi and of two cystic calculi, showing that the true renal calculi were composed almost entirely of calcium salts, while the cystic calculi were composed almost entirely of uric acid. Our series of calculi were all obtained from patients who lived in this country and our results can be compared with those obtained by several workers in England who obtained results similar to our own.
Rowlands1 in his investigations of twenty-two stones came to the following conclusions: that renal calculi were composed almost entirely of calcium oxalate; that uric acid is usually absent, and if present it is so only in very small traces; that phosphates are commonly present. Mackarell, Moore and Thomas,2 in a series of twenty-four analyses, corroborated the results of Rowlands.
We have analyzed quantitatively sixteen calculi from patients of various hospitals of New
KAHN M, ROSENBLOOM J. A REPORT OF SOME NEW CHEMICAL ANALYSES OF URINARY CALCULIWITH INDICATIONS FOR TREATMENT. JAMA. 1912;LIX(25):2252–2253. doi:10.1001/jama.1912.04270140056021