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The question
A laboratory's glucose EQA results (laboratory / peer mean, mmol/L) are: sample 1, 4.2 / 4.3; sample 2, 7.9 / 8.0; sample 3, 15.1 / 5.6; sample 4, 5.5 / 15.3; sample 5, 11.2 / 11.1. Internal QC was in control. The most likely cause of the two failures is:
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