Laboratory Medicine and Quality Assurance

Table. 3.

Mean bias of participants of the accuracy-based creatinine proficiency testing program for creatinine

Year-round Specimen name No. of participants* Creatinine

Target value (mg/dL) Mean bias (mg/dL) Mean bias (%)
2020-1st CAC-20-01 1,592 1.57 0.052 3.32
CAC-20-02 1,545 2.92 –0.085 –2.90
CAC-20-03 1,583 4.12 –0.082 –2.00
2020-2nd CAC-20-04 1,533 1.88 –0.029 –1.53
CAC-20-05 1,592 3.39 –0.046 –1.37
CAC-20-06 1,591 3.69 –0.055 –1.49
2021-1st CAC-21-01 1,597 0.85 0.056 6.55
CAC-21-02 1,587 1.37 0.015 1.06
CAC-21-03 1,504 1.83 0.021 1.17
2021-2nd CAC-21-04 1,599 0.89 0.045 5.08
CAC-21-05 1,579 1.22 0.022 1.77
CAC-21-06 1,549 1.72 0.013 0.75

Abbreviations: IQR, interquartile range; Q1, 25th percentile; Q3, 75th percentile.

*Number of participants without outlier; The outliers were defined as less than Q1–1.5×IQR or greater than Q3+1.5×IQR and were excluded from analysis.

Lab Med Qual Assur 2022;44:136~142 https://doi.org/10.15263/jlmqa.2022.44.3.136
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