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Methods for counting residual leukocytes in leukocyte‐depleted plasma—a comparison between a routine hematology instrument, the Nageotte chamber, flow cytometry, and a fluorescent microscopy analyzer

Counting very low levels of leukocytes is technically challenging but mandatory for quality control of leukocyte‐depleted plasma. Established assays, such as flow cytometry and counting in the Nageotte chamber, are laborious and expensive. The aim of this study was to test two alternative assays, the cerebrospinal fluid program in the routine hematology analyzer ADVIA 2120 and a fluorescence microscopy analyzer, the ADAM‐rWBC.