title: International ring test to check the quality of urolith analyses.
abstract: In an international ring test, five mixtures of stone substances were analyzed with different methods in 29 selected stone analysis laboratories in 13 countries. Evaluation revealed very good analysis qualities especially for X-ray diffractometric and infrared techniques. The analytical skills of the investigators are confirmed by a mean standard of quality of 1.69 for all qualitative results determined. It would be possible to improve the diagnosis of urolithiasis by standardizing and centralizing stone analysis.
mesh_terms: D002130:Calcium Phosphates / Q000652:urine; D006801:Humans; D007391:International Cooperation; D008855:Microscopy, Electron, Scanning; D011786:Quality Control; D013055:Spectrophotometry, Infrared; D014545:Urinary Calculi / Q000652:urine*; D014961:X-Ray Diffraction
chemical_list: D002130:Calcium Phosphates