FT-IR Analysis of Urinary Stones: A Helpful Tool for Clinician Comparison with the Chemical Spot Test

Table 2

Comparison between urinary stone composition (frequency %) obtained with chemical spot test (extrapolated associating the single chemical constituents) and FT-IR analysis.

Chemical spot test versus FT-IR in components identification
Components detected	Frequency (%) by chemical spot test	Frequency (%) by FT-IR
Oxalate	93.7	75.0
Calcium	81.2	77.1
Magnesium	33.3	4.1
Phosphate	29.1	37.5
Urate	18.7	25.0
Ammonium	14.5	4.1
Cystine	10.4	4.1
Carbonate	6.2	37.5