Table 2. Comparison of kidney stone analysis of large stones by chemical method & FT-IR spectroscopy with differences in core and surface chemical compositions (n=22).
| Results by chemical method | Results by FT-IR | No. | |
|---|---|---|---|
| Core composition | Surface composition | ||
| Calcium oxalate | COM | COM | 8 |
| Uric acid | Uric acid | Uric acid | 3 |
| Calcium oxalate | Uric acid | Uric acid | 2 |
| Calcium oxalate | Carbonate apatite | Carbonate apatite | 2 |
| Calcium oxalate | COD | COD | 1 |
| Calcium oxalate | Magnesium ammonium phosphate hexahydrate | Magnesium ammonium phosphate hexahydrate | 1 |
| Calcium oxalate | Ammonium urate | COM | 1 |
| Calcium oxalate | Ammonium urate | Carbonate apatite | 1 |
| Calcium oxalate | Carbonate apatite | COD | 1 |
| Calcium oxalate | COM | Uric acid | 1 |
| Calcium oxalate | COM | COD | 1 |
FT-IR, Fourier transform infrared; COM, calcium oxalate monohydrate; COD, calcium oxalate dihydrate.