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Evaluation of six cytometric methods for reticulocyte enumeration and differentiation in the cat
Paula C. Perkins1, Carol B. Grindem
1Department of Microbiology, Pathology, and Parasitology, College of Veterinary Medicine, North Carolina State University, Raleigh, NC 27606.
Insights
Thiazole orange is the preferred fluorescent dye for feline reticulocyte analysis by flow cytometry. Standardized methods using this dye accurately quantify reticulocyte subpopulations for routine laboratory use.
Area of Science:
- Veterinary Hematology
- Clinical Pathology
- Flow Cytometry
Background:
- Reticulocyte enumeration is crucial for diagnosing and monitoring anemia in felines.
- Flow cytometry offers a rapid and objective method for reticulocyte counting.
- Standardization of flow cytometric protocols for feline reticulocytes is needed.
Purpose of the Study:
- To evaluate the clinical utility of six flow cytometry protocols for feline reticulocyte analysis.
- To compare the performance of three fluorescent nucleic acid dyes: thiazole orange, auramine O, and acridine orange.
- To identify the optimal dye and protocol for accurate and reproducible reticulocyte subpopulation analysis.
Main Methods:
- Six flow cytometry protocols were tested using thiazole orange, auramine O, and acridine orange.
- Dye performance was assessed by comparing results with each other and with manual reticulocyte counts.
- Standardized instrument and gate settings were applied for thiazole orange analysis.
Main Results:
- Thiazole orange demonstrated the best performance, showing good correlation with manual counts.
- Thiazole orange clearly distinguished aggregate and punctate reticulocytes in high reticulocytosis cases.
- Standardized thiazole orange protocols accurately enumerated reticulocyte subpopulations even in low cellularity specimens.
Conclusions:
- Thiazole orange is the preferred fluorescent dye for feline reticulocyte analysis via flow cytometry.
- Standardized thiazole orange protocols provide a simplified and reliable technique for routine veterinary laboratories.
- Accurate enumeration of reticulocyte subpopulations aids in diagnosing and managing feline hematological disorders.
Abstract:
Six protocols utilizing three fluorescent nucleic acid dyes (thiazole orange, auramine 0, and acridine orange) were evaluated by flow cytometty for clinical utility in the analysis of feline reticulocytes. The dyes showed good to poor correlations with each other and with manual counts. Thiazole orange was the preferred stain. Thiazole orange dye showed distinct peaks corresponding to aggregate and punctate reticulocytes from specimens with marked reticulocytosis. The other dyes detected increases in reticulocyte numbers but subpopulations could not be distinguished. Standardized instrument and gate settings, applied to specimens stained with thiazole orange dye, enumerated aggregate and punctate reticulowes in low celfularity specimens that lacked distinct peaks. Percentages of these cells correlated well with manual counts, offering a simplified technique for routine laboratory use.
