Fig. 1. Trend in mean percentage bias in the ABCr PT survey by the KEQAS (2011–2019). N represents the number of participating laboratories in the first (A) and second (B) ABCr PT survey of the year. Abbreviations: ABCr PT, accuracy-based creatinine proficiency testing; KEQAS, Korean Association of External Quality Assessment Service.

Ann Lab Med 2021;41:372~379 https://doi.org/10.3343/alm.2021.41.4.372