The initial reporter stated they received discrepant ise results for 8 patient samples tested on a cobas 6000 c (501) module.Results for the following parameters are affected: na electrode, k electrode, and cl electrode.This medwatch will apply to the cl electrode.Please refer to the medwatch with a1.Patient identifier (b)(6) for information related to the na electrode and refer to the medwatch with a1.Patient identifier (b)(6) for information related to the k electrode.Refer to the attachment for all patient data.All results in the "repeat 1" column, except for sample 2, were automatically repeats performed on the complained analyzer.Results in the "repeat 2" column were measured on a second analyzer.Discrepancies were first found for samples 1 and 2.No questionable results from these samples were reported outside of the laboratory.The samples were repeated and the repeat values were deemed correct.The customer performed maintenance on the analyzer, but this did not resolve the issue.The customer then reported they had result discrepancies for samples 3-8.
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