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The customer would like the run data file investigated to determine a possible cause for the elevated white blood cell (wbc) content in the platelet product.There was not a transfusion recipient or patient involved at the time of the residual white blood cell (rwbc) testing, therefore no patient information is reasonably known at the time of the event.Donor unit id is not available, at this time.The platelet collection set is not available for return because it was discarded by the customer.
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This report is being filed to provide additional information.Investigation: per the customer, the product was tested using the adam cell counter.Based on the specified range of the cell counter (1x10^4 ¿ 1x10^7 cells/ml), the wbc count was estimated to be at least 5.3x10^9.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 leukoreduced.It is also possible, though not conclusive, that this leukoreduction failure may be donor related.A potential reason for this donor related leukoreduction failure may be, but is not limited to, a high wbc count.
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