QC testing has failed. The instrument operator has checked control and reagent dates, as well as, storage conditions. All parameters were within acceptable limits. The operator repeats testing incorporating new bottles of control material. The quality control continues to fail. What is the next step that should be followed in troubleshooting this QC problem?

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QC testing has failed. The instrument operator has checked control and reagent dates, as well as, storage conditions. All parameters were within acceptable limits. The operator repeats testing incorporating new bottles of control material. The quality control continues to fail. What is the next step that should be followed in troubleshooting this QC problem?

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