The initial reporter stated they received discrepant results for one patient sample tested with the elecsys total psa assay on a cobas e 801 analytical unit, serial number (b)(6).The sample initially resulted in a total psa value of 0.018 ng/ml.The result was reported outside of the laboratory and questioned.The sample was repeated on a second analyzer, resulting in a total psa value of 3.360 ng/ml.The sample was then repeated on the initial analyzer and second analyzer, resulting in total psa values of 3.34 ng/ml and 3.39 ng/ml.
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