What is the role of blank measurements in instrument drift control on automated platforms?

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Blank measurements establish the baseline signal of the system, capturing background from solvents, reagents, cuvettes or tubes, and detector noise. As an automated platform runs, instrument drift—changes in lamp intensity, sensor response, temperature effects, or reagent depletion—shifts this baseline over time. By measuring a blank, you quantify that background and can subtract it from each sample signal or adjust the baseline, so the resulting measurement reflects the true analyte signal rather than drifting background. This also helps flag issues like contamination or carryover if the blank changes unexpectedly. Blank measurements don’t directly set the concentration scale—that’s the job of calibration with standards—but they are essential for removing background and tracking drift to keep results accurate.