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The investigation determined that higher than expected vitros %a1c results were obtained from a single sample processed using vitros chemistry products hba1c reagent lot: 1539-45-3118 on a vitros 5600 integrated system.The results were higher than expected when compared to the result obtained on from a finger capillary puncture sample using a siemens dca vantage point of care (poc) test system.The assignable cause cannot be determined with the information provided.Historical vitros hba1c lot: 1539-45-3118 results were within expectation; therefore, a reagent issue is not a likely contributor to the event.Continual tracking and trending of complaints has not identified any signals that would point to a potential systemic performance issue with vitros hba1c reagent lot: 1539-45-3118.It is unknown if the customer was following the tube manufacturers guidelines for sample preparation and it is possible that cellular debris, due to poor sample preparation, was present in the affected samples, although this could not be confirmed.Diagnostic within-run precision testing to assess instrument performance was not processed, therefore, an analyzer performance issue cannot be ruled out as contributing to the event.
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