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Comprehensive and Detailed Explanation:

Quality control samples contain known analyte concentrations used to verify the accuracy and precision of test systems. Running QC ensures that instruments, reagents, and operator technique are functioning correctly before releasing patient results. QC is a core part of laboratory quality assurance and must be documented daily or per manufacturer guidelines. Out-of-range QC results require immediate investigation, corrective action, and re-running controls before patient samples are tested. QC does not replace calibration or maintenance but complements them as part of a comprehensive quality management system. ASCP objectives stress the phlebotomist’s awareness of QC significance, especially in POCT environments, where phlebotomists may directly operate waived or moderate complexity tests. Reliable QC protects patient safety, maintains regulatory compliance, and strengthens confidence in laboratory results.