This event occurred in (b)(6).All tsh results from the roche analyzers and the analyzer from abbott were below the normal reference ranges for the respective assays.Calibration and qc at the investigation site were ok.A general reagent issue can be excluded.Assays from different manufacturers, in this case abbott, can generate different results.This relates to the overall setups of the assays, the antibodies used, differences in reference materials and the standardization methodology used.The investigation did not identify a product problem.
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