This event occurred in (b)(6).The ft4 results from all analyzers are around the upper level of the respective normal reference ranges for the assays.Calibration and qc at the investigation site was acceptable.Based on the information provided, 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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