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Optimal gating strategies for determining bronchoalveolar lavage CD4/CD8 lymphocyte ratios by flow cytometry
Simon M Barry1, George Janossy
1HIV Immunology, Department of Clinical Immunology, Royal Free Hospital, Pond Street, London NW3 2QG, UK. sbarry@doctors.org.uk
Insights
Flow cytometry (FCM) precisely measures T cell subset ratios in bronchoalveolar lavage (BAL) fluid. Simplified gating strategies using CD45, CD4, and CD8 offer clinically insignificant differences compared to complex methods.
Area of Science:
- Immunology
- Respiratory Medicine
- Analytical Cytology
Background:
- Bronchoalveolar lavage (BAL) CD4/CD8 T cell subset ratios are altered in various respiratory disorders.
- Accurate measurement of these ratios is diagnostically valuable.
- Flow cytometry (FCM) offers advantages over traditional methods for BAL analysis.
Purpose of the Study:
- To evaluate optimal gating strategies for T cell subset ratio analysis in BAL using FCM.
- To compare simplified FCM gating methods with a complex "gold standard" approach.
Main Methods:
- Comparison of three FCM gating strategies for CD4/CD8 T cell subset ratios in 33 BAL samples.
- Utilized two different flow cytometers.
- Employed Bland Altman analysis to assess agreement between methods.
Main Results:
- Clinically insignificant differences were observed between two simplified gating strategies and the "gold standard" method.
- FCM demonstrated high precision for BAL T cell subset ratio analysis.
- A simple gating panel (CD45, CD4, CD8) is effective.
Conclusions:
- Simplified FCM gating strategies are reliable for analyzing BAL CD4/CD8 T cell ratios.
- The findings support the use of FCM with a basic gating panel for diagnostic applications in respiratory disorders.
Abstract:
Alterations in bronchoalveolar lavage (BAL) CD4/CD8 T cell subset ratios have been demonstrated in a variety of different respiratory disorders and the measurement of these changes may be diagnostically helpful. Flow cytometry (FCM) is a precise technology that offers many advantages over conventional cytospin techniques to determine T cell subset ratios in tissue fluids such as BAL. However, the optimum gating strategies for evaluating these parameters by FCM have not been evaluated. Here, the CD4/CD8 ratios in 33 BAL samples were compared using three different methods by FCM with two different flow cytometers. Bland Altman analysis demonstrated clinically insignificant differences between two simplified staining and gating strategies and a more complex "gold standard" method. These findings confirm the precision of FCM for BAL T cell subset ratio analysis and suggest that the optimal gating strategy may be a simple panel using only CD45, CD4 and CD8.
