Publications & Reports

A reliable and inexpensive EasyCD4 assay for monitoring HIV-infected individuals in resource-limited settings.

Balakrishnan P, Solomon S, Mohanakrishnan J, Cecelia AJ, Kumarasamy N, Murugavel KG, Venkatakrishnan B, Solomon SS, Crowe SM, Ganesh AK, Thyagarajan SP, Flanigan T, Mayer KH
YRG Centre for AIDS Research and Education, Chennai, India. [email protected]


Serial measurements of absolute CD4+ T-lymphocyte counts are required to initiate and gauge response to therapy and monitor disease progression. Hence, there is an urgent need to evaluate the accuracy and validity of low-cost CD4+ T-cell count assays. Tripotassium EDTA blood specimens from HIV-infected individuals were studied using a novel flow cytometric assay (EasyCD4 assay; Guava Technologies, Hayward, CA) in comparison with standard flow cytometry (FACSCount; Becton Dickinson Immunocytometry Systems, San Jose, CA). The sensitivity, specificity value by EasyCD4 assay in enumerating absolute CD4+ T-cell counts of less than 200 cells/microL were 95% and 100%, respectively. Bland-Altman analysis showed close agreement, with the EasyCD4 assay yielding CD4+ T-cell counts a mean difference of -26 cells/microL (95% confidence interval, -96 to 44 cells/microL) higher than by flow cytometry. Our data suggest that EasyCD4 assay could be a useful alternative assay to conventional flow cytometry, may be appropriate for use in resource-limited settings.


  • Journal: Journal of Acquired Immune Deficiency Syndromes
  • Published: 01/09/2006
  • Volume: 43
  • Issue: 1
  • Pagination: 23-26

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