Four-parameter white blood cell differential counting based on light scattering measurements

Area of Science:

• Hematology
• Biomedical Engineering
• Analytical Chemistry

Background:

• Accurate white blood cell differential counts are crucial for diagnosing various medical conditions.
• Traditional methods may require sample staining, adding complexity and time.
• Flow cytometry offers a rapid and precise method for cell analysis.

Purpose of the Study:

• To develop and validate a simple flow cytometry instrument for four-parameter white blood cell differential analysis.
• To utilize depolarized orthogonal light scattering for distinguishing eosinophilic from neutrophilic granulocytes.
• To assess the reliability of light scattering properties for differentiating unstained leukocytes.

Main Methods:

• A custom-built flow cytometer using a helium neon laser was employed.
• Simultaneous measurement of four light scattering parameters.
• Identification of lymphocytes, monocytes, and granulocytes based on forward and side scatter.
• Discrimination of eosinophils from neutrophils using orthogonal and depolarized orthogonal light scattering.

Main Results:

• Lymphocytes, monocytes, neutrophils, and eosinophils were successfully identified and differentiated.
• High correlation coefficients were observed for lymphocytes (0.99), neutrophils (0.99), and eosinophils (0.98).
• A good correlation (0.76) was found for monocyte differentiation.

Conclusions:

• Measurement of light scattering properties of unstained leukocytes provides reliable white blood cell differentiation.
• This method enables accurate analysis of the four most clinically relevant leukocyte types.
• The developed flow cytometry technique offers a promising approach for routine differential white blood cell counts.