The customer performed instrument troubleshooting since their quality control (qc) seemed to drift out of range before calibration expiration.After troubleshooting the qc performance improved, but the qc values again drifted upward when the co2 test count drop down to about 50.Further investigation of the customer issue included a review of associated complaints, a review for complaint trends, a review of labeling.No adverse trend was identified for the customer's issue.Labeling was reviewed and found to be adequate.No product deficiency was identified.
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