Fig. 3. Mean percentages of acceptable performances considering the participants’ EQA results according to different performance goals. Data categorized into three groups are shown for each test item. (A) Standardization of laboratory tests, including HbA1c, creatinine, total cholesterol, and triglyceride. (B) Harmonization category, including AFP and PSA classified according to the calibrator (Hybritech standard or WHO 96/670 IS). (C) Lack-of-harmonization category, including cardiac troponin I, according to six manufacturers (A–F).
Abbreviations: EQA, external quality assessment; AFP, alpha-fetoprotein; PSA, prostate-specific antigen; IS, international standard.

Ann Lab Med 2023;43:425~433 https://doi.org/10.3343/alm.2023.43.5.425