The effect of some possible factors to c-Peptide immunoreactivity urine on the quality of results

About 15 % of CPR-U was not correspond between two kinds of kits in the routine assay, which were produced by different pharmaceutical corps, and also it is realised that the effect of the preservative, storage condition and buffer dilutions can not be overlooked in quality control programmes. Based on these problems, following results are concluded; (1) Urine preservative: NaN3 is better than toluene. (2) Urine CPR was stable for added preservative at 4 deg C for two weeks. (3) Diluents may effect the CPR-U results, if not kept in good condition. The role of the makers in supporting improved quality in clinical laboratory tests will be expectated. (author)