Publication: CD4+ T-lymphocyte enumeration with a flow-rate based method in three flow cytometers with different years in service
Issued Date
2008-09-01
Resource Type
ISSN
15524957
15524949
15524949
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2-s2.0-51749110853
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Mahidol University
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SCOPUS
Bibliographic Citation
Cytometry Part B - Clinical Cytometry. Vol.74, No.5 (2008), 310-318
Suggested Citation
Kovit Pattanapanyasat, Pattamawan Chimma, Panudda Sratongno, Surada Lerdwana CD4+ T-lymphocyte enumeration with a flow-rate based method in three flow cytometers with different years in service. Cytometry Part B - Clinical Cytometry. Vol.74, No.5 (2008), 310-318. doi:10.1002/cyto.b.20425 Retrieved from: https://repository.li.mahidol.ac.th/handle/20.500.14594/18862
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Title
CD4+ T-lymphocyte enumeration with a flow-rate based method in three flow cytometers with different years in service
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Abstract
Background: CD4+ T-lymphocyte count remains the most important surrogate marker for management of HIV patients in resource-poor countries. The standard single-platform (SP) bead-based flow cytometric method for CD4+ testing is expensive; more affordable methods are needed. We evaluated the SP flow-rate-based calibration method for determining CD4+ counts, using three flow cytometers of varying ages. Methods: CD4+ counts from 103 HIV-1 infected Thai patients were determined using a SP flow-rate method in flow cytometers with 2, 12, and 16 years of service. Results were compared to the bead-based method. Correlation and agreement were analyzed using linear regression and Bland-Altman analysis. Results: Counts obtained from the flow-rate approach in each flow cytometer showed strong correlation with the bead-based method (R2 = 0.97, 0.97, and 0.96 for the 2-, 12-, and 16-year-old flow cytometers). The mean biases for the flow-rate approach compared with the bead-based method were +32.4 cells/μL (limit of agreement (LOA): -83.0 to +147.8 cells/μL), -28.8 cells/μL (LOA: -131.6 to +74.1 cells/μL), and -27.0 cells/μL (LOA: - 149.4 to +95.4 cells/μL). Conclusion: The flow-rate approach is reliable for determining CD4+ counts. Results do not vary by age of flow cytometer. This approach provides a cost-effective alternative for HIV patient monitoring in resource-poor settings. © 2008 Clinical Cytometry Society.