Fig. 4. Comparison of creatinine assay bias of three reagent manufacturers between accuracy-based creatinine proficiency testing (ABCr) proficiency testing (PT) participating laboratories before 2019 and after 2020. The instruments used were from the following companies: Beckman Coulter (Brea, CA, USA), Roche (Basel, Switzerland), and Sekisui Medical (Tokyo, Japan).

Lab Med Qual Assur 2022;44:199~203 https://doi.org/10.15263/jlmqa.2022.44.4.199

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