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Revista médica de Chile

Print version ISSN 0034-9887


SANCHEZ, Rodrigo et al. Chemical composition analysis of 649 urinary stones. Rev. méd. Chile [online]. 2021, vol.149, n.8, pp.1129-1133. ISSN 0034-9887.


Chemical composition analysis of urinary stones is a fundamental part of the metabolic workup of urolithiasis.


To report the chemical composition of urinary stones using infrared spectroscopy.

Material and Methods:

The chemical composition of rinary stones recovered from 649 patients aged 1 to 97 years (68% males), were analyzed using a Perkin Elmer FTIR Spectrometer, Spectrum Two.


Calcium oxalate monohydrate was the most common composition found in 45% of cases, followed by mixed composition, which included three ammonium phosphate stones in 29% of cases. Pure uric acid composition was found in 16% of stones. Three cystine stones were detected.


These findings do not differ from those found in developed countries.

Keywords : Calcium Oxalate; Spectrophotometry; Urolithiasis.

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