Which action is included in the 'Adding stuff, mixing, incubation' step?

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In this step, the key action is initiating the chemical reaction by adding the required reagents to the sample and mixing them so everything interacts uniformly. Adding reagents brings in the substances that will react with the analyte or with each other, and thorough mixing ensures a homogeneous reaction mixture so every part of the sample experiences the same conditions. After this, incubation provides a controlled time window and temperature for the reaction to proceed, allowing measurable product or signal to develop.

Data interpretation happens after the measurement is obtained, not during the setup. Sample collection occurs before this step, as the workflow starts with obtaining the specimen. Instrument calibration is a separate preparation activity to ensure the analyzer is accurate, and it typically occurs before running samples or during routine maintenance, not as part of adding reagents and mixing.