Laboratory Medicine and Quality Assurance

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Fig. 2. Commutability of the frozen human serum pools (FSPs) for carcinoembryonic antigen (CEA) measurement. The FSPs, patient samples, and quality control (QC) materials were measured for CEA using 4 assay platforms: Roche vs. Abbott (A), Siemens (B), Beckman (C), Abbott vs. Siemens (D), Beckman (E), Siemens vs. Beckman (F). The solid lines indicate the Deming regression lines and dashed lines indicate the upper and lower 95% prediction intervals (PIs). The gray, yellow squares, and blue triangles represent the results of the patient samples, FSPs, and QC materials, respectively. (See the journal website for colors.) The instruments used were from Abbott Laboratories (Abbott Park, IL, USA), Beckman Coulter Inc. (Brea, CA, USA), Roche Diagnostics (Mannheim, Germany), and Siemens Healthineers (Erlangen, Germany).
Lab Med Qual Assur 2022;44:111~120
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