The investigation determined that a non-reproducible, lower than expected vitros creatinine (crea) result was obtained from a single patient sample processed using vitros chemistry products crea slides lot 1503-3534-0931 on a vitros 5600 integrated system.A definitive assignable cause of the event could not be determined with the information provided.Based on historical quality control results a vitros crea lot 1503-3534-0931 related issue is not a likely contributing factor of the event.Ongoing tracking and trending of complaint data has not identified any signals to suggest there is a systemic quality issue with vitros crea reagent lot 1503-3534-0931.An ortho field engineer performed periodic maintenance on the vitros 5600 system and cleaned a dusty film from the microslide incubator.However, as no precision testing was performed on the vitros 5600 integrated system an instrument related issue could not be completely confirmed or ruled out as a contributor of the event.Historical qc results were precise, indicating that an instrument related issue was not a likely contributing factor of the event.Additionally, 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 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 sample, although this could not be confirmed.In addition, as no information regarding whether the patient had been taking any medications or supplements around the time of the event was provided, a sample interferent cannot be ruled out as a possible contributor of the event.
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