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The investigation has determined that a non-reproducible higher than expected troponin es result was obtained from a single patient sample using vitros troponin i es (tropi es) reagent lot 6220 on a vitros 5600 integrated system.The result was considered discordant when compared to a vitros hs troponin i (hstni) result obtained from the same patient sample.The assignable cause of the non-reproducible higher than expected patient sample result could not be determined.It is unknown which qc material the customer uses to verify the performance of the vitros tropi es reagent.In addition, no quality control data was provided, therefore, it was not possible to assess the performance of vitros tropi es reagent lot 6220 at the time of the event.Consequently, a reagent-related issue cannot be ruled out as a contributing factor to the event.No precision testing was performed on the vitros 5600 integrated system; therefore, instrument performance at the time of the event could not be verified.However, there was no evidence of an instrument malfunction as an acceptable result for the patient was obtained on the vitros 5600 system using the vitros hstni assay.Pre-analytical sample processing could not be ruled out as a contributing factor as it is unknown if the customer was following the sample collection device manufacturers recommended centrifugation protocol.Improper pre-analytical sample handling could have contributed to the event.It is possible that cellular debris, due to poor sample preparation, was present in the affected sample, although this could not be confirmed.The customer used a blocking tube when repeating the patients sample using vitros tropi es and obtained a result of 0.045 ng/ml.The type of blocking tube used was not provided.The result obtained using the unknown blocking tube was lower than the initial result of 0.067 ng/ml, indicating a possible unknown interferent that affects the tropi es reagent but not the vitros hstni reagent as a potential contributor to the event.Continual tracking and trending of complaints has not identified any signals that would indicate a potential systematic issue with vitros tropi es reagent lot 6220.
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