A control result falls more than three standard deviations from the mean. What is the appropriate action?
1Report patient results and repeat the control on the next run
2Reject the run, investigate the cause, correct it, and repeat✓ 정답
3Report patient results with a disclaimer
4Recalculate the control mean to include the new value
해설
A control value beyond 3 standard deviations is a rejection, not a warning. Patient results from that run must be withheld while the cause is investigated and corrected, and the run repeated. Check control material deterioration, then reagent, instrument, and technique.