Fig. 1. Mean percent bias change for creatinine of major reagent manufacturers in the accuracy-based creatinine testing program. Outliers were excluded from the analysis. The instruments used were as follows: Beckman Coulter (Brea, CA, USA), Biosystems (Barcelona, Spain), JW Medical (Seoul, Korea), Roche Diagnostics (Indianapolis, IN, USA), Sekisui Medical (Tokyo, Japan), Shenzhen Mindray Bio-Medical Electronics (Shenzhen, China), Shinwha Medi (Hanam, Korea), and Standio Laboratory (Boerne, TX, USA).
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