Residual red cell and platelet content in WBC-reduced plasma measured by a novel flow cytometric method.

Background: The levels of residual red blood cells (RBC) and platelets (PLT) in WBC-reduced plasma are often below the lower detection limit of automated blood cell counters. This study established a novel flow cytometric method for the enumeration of residual RBC and PLT in plasma. Furthermore, their levels in WBC-reduced plasma prepared by using various filters were investigated.