Résumé
Automated reticulocyte counting has become an essential instrument of the hematology laboratory. This automatic technique has lead to diminishing labour tasks and to significant improvements in accuracy and precision compared with the manual microscopic methods. In any event, it adds a considerable expense to the laboratory budget. Here, we report the modified method of applying the new mixture of 1 microL of whole blood with 1 mL of reticulocyte reagent, which we evaluated for its accuracy and precision, instead of using the mixture of 3 microL of whole blood with 3 mL of reticulocyte reagent recommended by the company. We demonstrated the accepted accurate and precise results of percentage and absolute number of retculocyte count, low-stained reticulocyte count and its corpuscular indices; the mean reticulocyte corpuscular volume (MCVr), mean reticulocyte corpuscular hemoglobin concentration (CHCMr), and mean reticulocyte hemoglobin content (CHr). These suggested that, for every red cell assessed, the number, the cell volume, hemoglobin content and concentration are accurately and precisely measured by the modified method while the sub-populations of reticulocyte count and distribution width of reticulocyte indices are variable. In conclusion, our results provided the information that 1) the modified method can be used as a routine test and it provides accurate and precise results; 2) with the modified method, two-thirds of the expense spent for reticulocyte reagent can be saved; 3) it should not be used for research purposes.