Measurement of peripheral B cell subpopulations in common variable immunodeficiency (CVID) using a whole blood method

Area of Science:

• Immunology
• Clinical Diagnostics

Background:

• Common variable immunodeficiency (CVID) is characterized by reduced CD27+ memory B cells and increased undifferentiated B cells.
• Existing CVID classification systems rely on B cell quantification, but their clinical utility needs validation.
• Current methods often require prior separation of peripheral blood mononuclear cells (PBMC), limiting routine diagnostic application.

Purpose of the Study:

• To evaluate the feasibility and accuracy of classifying CVID patients using flow cytometry on whole blood samples.
• To determine if whole blood flow cytometry correlates with existing CVID classification methods.
• To assess the reproducibility of the whole blood flow cytometry method for CVID diagnosis.

Main Methods:

• Examined 23 CVID patients and 24 controls.
• Utilized flow cytometry on both peripheral blood mononuclear cells (PBMC) and whole blood samples.
• Compared results with established CVID classification systems, including B cell immunoglobulin secretion and flow cytometric methods.

Main Results:

• Excellent correlation was observed between flow cytometry results from PBMC and whole blood.
• The whole blood flow cytometry method demonstrated excellent reproducibility.
• Classification of CVID patients using whole blood showed high concordance with existing methods, with only one patient reclassified.

Conclusions:

• Flow cytometry on whole blood is a reliable and reproducible method for classifying CVID.
• This simplified approach eliminates the need for PBMC separation, facilitating routine clinical diagnosis.
• The findings support the use of whole blood flow cytometry for CVID subtyping and potentially improved patient management.