Differential leucocyte counts: a comparison of results using light and electron microscopy

Area of Science:

• Cell Biology
• Microscopy Techniques
• Immunology

Background:

• Accurate differential counting of leucocytes is crucial in diagnosing inflammatory conditions.
• Traditional light microscopy methods have limitations when detailed ultrastructural analysis is required.
• Electron microscopy offers higher resolution but requires specialized sample preparation for accurate cell counting.

Purpose of the Study:

• To develop and validate a method for differential leucocyte counting from inflammatory peritoneal exudates using ultrathin sections for electron microscopy.
• To compare the accuracy of differential counts obtained from ultrathin sections with standard light microscopy techniques.
• To assess the potential sources of error and advantages of ultrastructural differential counting.

Main Methods:

• Leucocytes were isolated from inflammatory peritoneal exudate.
• Samples were prepared as ultrathin sections for electron microscopy.
• Differential counts from ultrathin sections were compared to those obtained from cytocentrifuge-prepared samples analyzed by light microscopy.
• Careful attention was paid to sample preparation and orientation for electron microscopy.

Main Results:

• Differential counts from ultrathin sections analyzed by electron microscopy showed comparable accuracy to standard light microscopy procedures.
• The method proved effective across cell populations with widely different compositions.
• Suitable preparation and orientation are key to achieving reliable ultrastructural differential counts.

Conclusions:

• Ultrathin sectioning for electron microscopy is a viable method for accurate leucocyte differential counting.
• This technique offers a valuable alternative or complement to light microscopy for cell suspension analysis.
• The method has broad applicability in research and diagnostics requiring precise differential cell counts in electron microscopy samples.