How should reagent lot changes be managed in automated chemistry systems to maintain result comparability?

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Reagent lot changes can alter instrument response and assay performance, so you must confirm that the new lot will produce results comparable to the established baseline. This means calibrating the analyzer with the new lot to align the response, running appropriate controls to verify that results stay within predefined acceptance criteria, and revalidating the overall assay performance (accuracy, precision, and linearity) with the new lot to prove continued comparability. Tracking lot numbers provides traceability for investigation if needed, and quarantining old lots until the new lot passes acceptance testing prevents unverified material from influencing results. Other approaches fall short because they skip one or more essential steps: you can’t assume equivalence without verification, tracking alone doesn’t prove performance, and calibrating without controls and revalidation risks missing drift or bias.