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The customer's calibration and qc results, sample pre-analytic details, and system alarm trace were requested but not provided.Per product labeling, "the measured anti-tg value of a patient's sample can vary depending on the testing procedure used.The laboratory finding must therefore always contain a statement on the anti-tg assay method used.Anti-tg values determined on patient samples by different testing procedures cannot be directly compared with one another and could be the cause of erroneous medical interpretations.If there is a change in the anti-tg assay procedure used while monitoring therapy, then the anti-tg values obtained upon changing over to the new procedure must be confirmed by parallel measurements with both methods." based on the available information, a general reagent issue could be excluded.The investigation did not identify a product problem.The cause of the event could not be determined.
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