title: [Ensuring quality in the analyses of urinary calculi by a comparison of methods. 3d International Ring Trial].
abstract: Of 5 analysis tests of the 3rd International Ring Experiment for the control of the quality of methods of the analysis of urinary calculi 38 findings compiled according to 9 different techniques came in from 12 countries. The average deviation per component concerning all 5 analysis tests is considerably low with 0.10 mol proportions. The average quality measure SQ concerning all participants is approximately 2.00; it deteriorates from the X-ray diffraction method over the IR-technique to the other quantitative methods used. Advantages and disadvantages of the X-ray diffraction and IR-spectroscopic analysis are discussed. A methodically homogeneous and centralized performed analysis of urinary calculi shows advantages in the quality of the analyses.
mesh_terms: D001031:Apatites / Q000378:metabolism; D002129:Calcium Oxalate / Q000378:metabolism; D005859:Germany, East; D006801:Humans; D007391:International Cooperation; D008274:Magnesium / Q000378:metabolism; D017616:Magnesium Compounds; D008832:Microchemistry / Q000379:methods; D008859:Microscopy, Polarization / Q000592:standards; D010710:Phosphates / Q000378:metabolism; D011786:Quality Control; D013054:Spectrophotometry, Atomic / Q000592:standards; D013055:Spectrophotometry, Infrared / Q000592:standards; D000069877:Struvite; D014527:Uric Acid / Q000378:metabolism; D014545:Urinary Calculi / Q000378:metabolism*; D014961:X-Ray Diffraction
chemical_list: D001031:Apatites; D017616:Magnesium Compounds; D010710:Phosphates; D002129:Calcium Oxalate; D014527:Uric Acid; C016188:weddellite; D000069877:Struvite; D008274:Magnesium
vernacular_title: Sicherung der Qualität von Harnsteinanalysen durch Methodenvergleiche. 3. Internationaler Ringversuch.