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This paper describes a comparison between the microscopic brilliant cresyl blue and the flow cytometric thiazol orange (FACScan) and auramine O (Sysmex) methods for enumeration of reticulocytes. The mean intra-assay coefficients of variation for the microscopic, FACScan and Sysmex methods were established to be 33.9 and 5% respectively. A rather poor correlation was observed between the microscopic count and both flow cytometric methods (FACScan r = 0.61; Sysmex r = 0.57). However, the correlation between the flow cytometric methods was satisfactory (r = 0.79). Reference ranges for the reticulocyte count, corresponding with the 2.5th and 97.5th percentile, were determined for the microscopic (8-30/1000), FACScan (11-27/1000) and Sysmex (8-18/1000) methods. Sysmex R-3000 methodology definitely revealed the lowest and narrowest reference range. In conclusion, because of higher reproducibility, flow cytometric analysis of reticulocytes is an attractive alternative procedure for the microscopic enumeration method.

Methodology-Dependent Variations in Reticulocyte Counts Using a Manual and Two Different Flow Cytometric Procedures