| Suspected stone composition | Diagnostic criteria | ||
| CT scan density | RS morphology | Cristalluria | |
| Calcium dependent | >850 - 1000 | spiculated surface, bipyramial surface, sharp angles, pame, yellow to brown | weddelite or calcium phosphate crystals |
| Oxalate dependent | 650 - 850 | mamillary or budding surface, cream to pale, dark to brown | whewellite crystals |
| Uric acid | <650 | homogeneous smooth or rough, porous, orange to grayish | uric acid crystals |
| Drug-induced | radiolucent, can be diagnosed by ultrasonography or enhanced CT scan (low density) | variable | drug crystals |