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This study was performed to quantify the effect of a 1-weekfreezer storage of urine on its calcium oxalate crystallization risk. Calcium oxalate is the most common urinary stone material observed in urolithiasis patients in western and affluent countries. The BONN-Risk-Index of calcium oxalate crystallization risk in human urine is determined from a crystallization experiment performed on untreated native urine samples.

The influence of freezer storage of urine samples on the BONN-Risk-Index for calcium oxalate crystallization