Investigation: the dlogs were unavailable for this event.The customer provided information about a similar incident (1722028-2020-00363).The dlog for the similar incident indicated "possible air block" because at 21 minutes into the procedure, after receiving an alarm for low platelet concentration, the operator performed an air block recovery.It is possible, however not conclusive, the customer received a similar verification flag for this procedure.The customer did not respond to requests to provide the lot number for the disposable; therefore, a dhr search could not be conducted for this specific incident.All lots must meet acceptance criteria for release.Root cause: a definitive root cause could not be determined.Possible causes for air bubbles include but are not limited to: an occlusion in the disposable set due to manufacturing error, including solvent or molding occlusions; incomplete loading of the disposable set causing an occlusion in the tubing and/or an air block, which restricted the flow.Introduction of air into the anti-coagulant (ac), saline or inlet line during or after disposable prime (if prime solution bag runs dry and air from the bag is pulled into the tubing); a kink or an occlusion in the collect line.
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