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The investigation determined that higher than expected vitros ipth results have occurred with multiple patient samples when comparing results between the vitros ipth assay and the vitros ipth2 assay tested on a vitros 5600 integrated system.The assignable cause could not be determined.Vitros quality control fluids processed within the timeframe of the comparison testing were performing as expected except for biorad control lot 65000 l3 controls.However, acceptable biorad l3 quality control performance was obtained using an alternate vitros ipth lot 2060.Therefore, a performance issue with vitros ipth reagent lot 2030 cannot be completely ruled out as a contributing factor to the event.Continual tracking and trending of complaints has not identified any signals that would indicate a potential systematic issue with vitros ipth reagent lot 2030.No diagnostic within-run precision testing was performed to assess the performance of the vitros 5600 integrated system.However, acceptable vitros ipth performance was obtained using an alternate reagent lot with no actions taken to optimize the instrument performance.Therefore, an instrument related issue did not likely contribute to the event.
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