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Investigation: the device history records (dhr) were reviewed for this lot.There were no events noted in the dhr that would have contributed to the elevated wbc count experienced by the customer.The run data file (rdf) was analyzed for this event.Root cause: run data file analysis did not show a conclusive root cause for the higher than expected wbc content in the platelet product reported for this procedure.Alerts that could contribute to wbc contamination of the platelet product, such as ¿centrifuge pressure high¿ or¿rbc spillover¿, were not generated in this run data file.There were no events (alerts,adjustments, changes in pump speed, substate changes, etc.) during the collection that could have cause wbcs to escape from the lrs chamber.As the rbc detector cannot count the cells passing by, in order to generate a ¿potential wbc contamination detected¿ message, the rbc detector signals must see a significant change in the reflectance values.In this procedure, rbc detector reflectance signals did not indicate that wbcs were escaping the lrs chamber.Therefore, the run data file reported that the platelet product could be labeled as leuko reduced.It is also possible, though not conclusive, that this leukoreduction failure may be donor related.
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