Evaluation of the analytical performance and usability of the VChemy S analyzer for decentralized multipanel testing

To evaluate the analytical performance, comparability, reference interval transference, and usability of the VChemy S point-of-care testing (POCT) analyzer for 16 biochemistry analytes using whole blood, serum and plasma. The study aimed to determine its suitability for decentralized testing and concordance with accredited central laboratory methods.

Adult outpatients were recruited to assess precision following CLSI EP15 and method comparison following CLSI EP09. Measurements were performed using VChemy S cartridges in whole blood, serum, and plasma and compared with results obtained in Roche Cobas^® Pro. Analytical performance was evaluated through Passing-Bablok regression, Bland-Altman analysis and comparison with EFLM minimum analytical quality specifications. Reference interval transference was examined according to CLSI EP28 using healthy volunteers. Usability was assessed through a 15-item Likert-scale questionnaire completed by users.

All analytes showed acceptable repeatability and within-laboratory imprecision, meeting manufacturer specifications and EFLM analytical performance targets, except glucose, which exceeded its APS. Fourteen of the sixteen analytes demonstrated analytical comparability across all matrices, with mean relative differences within total allowable error. Chloride and alkaline phosphatase exhibited method-dependent biases, preventing interchangeability and reference interval transference for chloride. Reference intervals were verified for all remaining analytes. Usability evaluation demonstrated a high satisfaction score (above 90 %).

VChemy S provides analytically reliable results in whole blood, serum, and plasma for most routine biochemistry analytes, demonstrating strong alignment with central laboratory methods. Its portability, concordance with central laboratory methods, and user acceptance support its implementation in decentralized clinical settings, enabling faster decision-making and reduced preanalytical complexity.