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POCT quality management is non-negotiable, even for CLIA-waived tests. When a control result is out of range, the system is considered unreliable. ASCP-aligned competencies emphasize halting patient testing, troubleshooting per the manufacturer’s instructions, and re-establishing control validity before resuming. Causes of QC failure include expired or improperly stored strips/reagents, device malfunction, environmental extremes, or user error (e.g., incorrect coding). The correct response is to investigate: check expiration dates, storage temperatures, lot numbers, and instrument settings; open a new vial of strips or control solution if needed; and repeat QC. Only after QC falls within the acceptable range may patient testing resume. Document the failure, the corrective actions taken, and the final acceptable QC results, following your facility policy. Reporting patient values while QC is failing undermines result reliability and can harm patients. Averaging or ignoring QC contradicts good laboratory practice. Consistent QC, operator competency assessments, and adherence to lot-to-lot verification are essential pillars of POCT stewardship and align with ASCP expectations for safe, accurate patient care.