Comparison of lymphocyte immunophenotypes obtained simultaneously from two different data acquisition and analysis...

Area of Science:

• Immunology
• Flow Cytometry
• Clinical Diagnostics

Background:

• Accurate immunophenotyping of lymphocyte populations is crucial for diagnosing and monitoring various immune conditions, including HIV.
• Different data acquisition and analysis systems may yield varying results, necessitating validation for clinical use.

Purpose of the Study:

• To compare the performance of two distinct data acquisition and analysis systems for lymphocyte subset enumeration.
• To assess the concordance of immunophenotyping results obtained from different methods on the same flow cytometer.

Main Methods:

• Parallel immunophenotyping of lymphocyte populations (CD3+, CD4+, CD8+, CD56+, CD16+, TCR-gamma delta+) from 113 human peripheral blood specimens.
• Utilized two systems: EPICS C and 4Cyte-Acmecyte, on a single EPICS C flow cytometer.
• Included both HIV-negative and HIV-positive samples, with some having low CD4+ T-cell counts.

Main Results:

• Both systems demonstrated high agreement (within 2% positive cells in 97% of cases) despite variations in gating and bitmap shapes.
• Statistically significant biases were observed but were deemed small and not biologically significant.
• Results were essentially equivalent for experienced operators on the EPICS C flow cytometer.

Conclusions:

• The EPICS C and 4Cyte-Acmecyte systems provide essentially equivalent results for lymphocyte sub-population analysis in peripheral blood.
• This equivalence supports the reliable use of either system for clinical immunophenotyping by experienced operators.
• The findings validate the consistency of flow cytometry methods for immune status assessment.