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The investigation determined that higher and lower than expected valproic acid results were obtained from two levels of vitros tdm performance verifier (pv) fluids using vitros chemistry products valp reagent lot 2511-32-1764 on a vitros xt7600 integrated system.The assignable cause of the event cannot be determined with the information provided.Although limited vitros valp quality control results were provided, the results provided by the customer both before and after the event were within expectation, indicating that an issue with vitros valp lot 2511-32-1764 is not a likely contributor to the event.Additionally, continual tracking and trending of complaints has not identified any signals that would point to a potential systemic issue with vitros valp lot 2511-32-1764.No precision testing was processed on the vitros xt7600 system at the time of the event or this report.Therefore, an instrument issue cannot be confirmed or ruled out as a contributor to the event.The customer was questioned regarding their typical vitros pv fluid handling protocol, however, did not provide any of this information.A protocol related issue cannot be ruled out as a contributor to the event.Recalibration for vitros valp lot 2511-32-1764 was performed and acceptable qc results were obtained post calibration.However, it is unknown if the new calibration and subsequent qc runs were performed using the same pack that initially produced the unexpected results, therefore a pack-related issue cannot be confirmed or ruled out as a contributor to the event.
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