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: a definitive root cause for the observed elevated wbc count remains undetermined at this time.The rdf analysis indicated that there was a potentially an intermittent and/or partial blockage in the collect/platelet line during the run.When a platelet line block is resolved, there is the possibility that wbcs may have exited the lrs chamber due to the system re-establishing steady state.Potential causes for the blockage include but are not limited to: a partially or fully occluded platelet line coming from the centrifuge, an air block in the platelet line, a loading error of the kit in the centrifuge, a manufacturing defect may have been present on the tubing set.
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