The investigation has determined that a higher than expected vitros ckmb result was obtained from a patient sample processed during a reagent lot to lot correlation test using vitros chemistry products ckmb slides lot: 4912-0253-3587 on a vitros 5600 integrated system.Based on the limited information provided, a definitive assignable cause of the event was unable to be determined.As no quality control results were provided, a vitros ckmb lot: 4912-0253-3587 performance issue cannot be ruled out as a contributor of the event.However, continual tracking and trending of complaint data has not identified any signals to suggest there is a systemic quality issue with vitros ckmb lot: 4912-0253-3587.As precision testing was not performed on the vitros 5600 integrated system, an instrument related issue cannot be completely ruled out as a contributor of the event.However, there was no indication that the vitros 5600 system malfunctioned.Additionally, pre-analytical sample processing could not be ruled out as a contributing factor as the customer was not following the sample collection device manufacturer¿s 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 samples, although this could not be confirmed.
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