Comparative evaluation of three flow cytometers for reticulocyte enumeration

Area of Science:

• Hematology
• Clinical Pathology
• Flow Cytometry

Background:

• Manual microscopic methods for reticulocyte enumeration are being superseded by flow cytometry.
• Flow cytometry offers automated and more precise analysis of red blood cell populations.

Purpose of the Study:

• To evaluate and compare the performance of three different flow cytometers for reticulocyte enumeration.
• To assess the comparability of reticulocyte counts obtained from Becton Dickinson FACScan, Coulter EPICS Profile II, and Ortho Cytoron Absolute instruments.

Main Methods:

• Evaluation of three flow cytometers (FACScan, EPICS Profile II, Cytoron Absolute) using thiazole orange dye.
• Analysis of 30,000 cells per sample, with manual gating of the erythroid population for fluorescence evaluation.
• Orthogonal regression analysis and paired t-tests were used to compare instrument performance on 100 healthy donor and 108 patient samples.

Main Results:

• All three instruments demonstrated good linearity and precision in reticulocyte counting.
• No significant carry-over was observed between samples.
• While statistically significant differences were noted between the Cytoron Absolute and the other two instruments, overall mutual comparability was good.

Conclusions:

• The Becton Dickinson FACScan, Coulter EPICS Profile II, and Ortho Cytoron Absolute are comparable for routine reticulocyte enumeration.
• Despite minor statistical variations, these flow cytometers provide reliable results for clinical practice.
• Flow cytometry offers an efficient and accurate alternative to manual reticulocyte counting.