What is the primary purpose of commutable controls in automated QC?

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Commutable controls are materials that behave like real patient samples when processed by the assay, so they reflect the same matrix effects and interactions the patient specimens would have with reagents and the instrument. That likeness means their results provide a true picture of how the assay performs on actual patient samples, not just on a synthetic or idealized material. Because of this patient-mimicking behavior, commutable controls are ideal for validating an assay during method development and for ongoing quality control, since they can reveal issues with accuracy or precision that only appear with real sample matrices. They help ensure that calibration is meaningful across the testing range and that QC results track what would happen with patient results, even when reagents or instruments change. They do not replace calibration standards; calibrators set the measurement scale, while commutable controls verify ongoing performance using samples that resemble those encountered in daily testing. They are not non-commutable by design; their purpose is the opposite. And while cost or storage considerations might matter in practice, they are not the primary reason for using commutable controls.