Fig. 1. Passing–Bablok regression curves of the immunoassays vs. LC-MS/MS (as the comparison method). (A) Abbott-D vs. LC-MS/MS. (B) Beckman-D vs. LC-MS/MS. (C) Siemens-D vs. LC-MS/MS. (D) Beckman-E vs. LC-MS/MS. (E) Siemens-E vs. LC-MS/MS.
Abbreviations: LC-MS/MS, liquid chromatography-tandem mass spectrometry; D, direct assay; E, extraction assay.

Ann Lab Med 2024;44:29~37 https://doi.org/10.3343/alm.2024.44.1.29