Method for the automation of equine differential leucocyte counts

Area of Science:

• Veterinary Hematology
• Clinical Pathology
• Automated Cell Analysis

Background:

• Accurate differential leucocyte counts are crucial for diagnosing equine health conditions.
• Manual microscopic analysis of blood smears is time-consuming and can be subjective.
• There is a need for automated, efficient, and reliable methods for equine leucocyte differential counting.

Purpose of the Study:

• To develop and evaluate an automated technique for equine differential leucocyte counts.
• To compare the accuracy of automated volume distribution curve analysis with standard microscopic methods.
• To assess the efficiency and limitations of the automated method for routine veterinary diagnostics.

Main Methods:

• Development of an automated technique using the Coulter Channelyzer for analyzing volume distribution curves of equine leucocytes.
• Evaluation of the technique by comparing its results with standard manual microscopic differential leucocyte counts.
• Analysis of blood samples for both differential and total leucocyte counts at a high throughput rate.

Main Results:

• Good agreement was observed between the automated method and standard microscopic techniques for most leucocyte types.
• The automated system classified an average of 16,000 leucocytes per sample.
• The method demonstrated suitability for precise counting of polymorphonuclear neutrophils, lymphocytes, and eosinophils.
• Blood films still require screening for monocytes and immature cells.

Conclusions:

• Automated analysis of volume distribution curves using the Coulter Channelyzer provides a reliable method for equine differential leucocyte counts.
• The technique significantly enhances efficiency, analyzing 25 samples per hour.
• While effective for neutrophils, lymphocytes, and eosinophils, manual review remains essential for detecting monocytes and immature cells in equine blood samples.