In a small clinic you perform morning fingerstick glucose point-of-care testing with a meter that requires daily quality control, and today's control result falls outside the expected range while a fasting patient waits and the strip lot is newly opened. Which CLIA-waived quality-control action best ensures accurate results?

Correct action follows CLIA-waived QC principle that failed daily controls prohibit patient reporting until the system is proven in control, so pausing testing while reviewing the highest-yield variables then demonstrating recovery with repeat controls, with escalation if failure persists, best ensures accuracy. Review of strips and technique is critical because the newly opened lot makes expiration, improper storage, miscoding, inadequate sample, and operator technique the leading causes of an out-of-range morning glucose control, and only a repeat in-range control confirms correction before the fasting patient is tested, while supervisor notification preserves documentation and troubleshooting. The cleaning-and-battery approach reflects sound maintenance but fails by missing cause specificity, addressing the meter rather than the lot change most likely to explain the shift. The document-and-notify approach shows good hold and escalation discipline but fails by omitting verification, leaving no repeat control evidence that accuracy was restored. The repeat-until-in-range approach shows good persistence but fails by omitting escalation, continuing independent repeats instead of involving the supervisor when controls remain out. Exam caveat is that fasting urgency or throughput pressure never justifies reporting from an out-of-control meter. Practical check is to verify strip and control lot numbers, expirations, storage, coding, technique, and logged repeat results before resuming.