
Evaluation of the blood stabilizers TransFix and Cyto-Chex BCT for low-cost CD4 T-cell methodologies.
TransFix(TM) and Cyto-Chex((R)) BCT (blood collection tube) reagents have been shown to maintain whole blood integrity for delayed immunophenotyping by flow cytometry. We evaluated the ability of these blood-stabilizing reagents to preserve HIV-seropositive blood for delayed CD4(+) T-cell quantification utilizing the Dynal((R)) Biotech T4 Quant Kit. TransFix was added to EDTA-anticoagulated whole blood and tested at a 1:10 dilution over 7 d using the Dynal (n = 21) manual method. Compared to baseline analysis, a significant decrease in mean CD4(+) counts was observed over time. Cyto-Chex BCT-preserved samples (n = 20) were tested for CD4(+) counts by Dynal over 7 d, with storage at varying temperatures: room temperature (21 degrees C), 37 degrees C, and 37 degrees C with intermittent storage at 42 degrees C. A significant decline in mean CD4(+) counts was observed in samples at all temperatures compared to baseline (p < 0.05). Increases in temperature to and above 37 degrees C resulted in a greater decline in mean CD4(+) counts over time. Our findings indicated that neither TransFix or Cyto-Chex BCT was a suitable blood stabilizer when used for delayed CD4(+) quantification with a low-cost manual CD4(+) bead-based method.
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Related Subject Headings
- Virology
- Temperature
- Reagent Kits, Diagnostic
- Humans
- HIV Infections
- Flow Cytometry
- CD4-Positive T-Lymphocytes
- CD4 Lymphocyte Count
- Blood Preservation
- 1107 Immunology
Citation

Published In
DOI
EISSN
Publication Date
Volume
Issue
Start / End Page
Location
Related Subject Headings
- Virology
- Temperature
- Reagent Kits, Diagnostic
- Humans
- HIV Infections
- Flow Cytometry
- CD4-Positive T-Lymphocytes
- CD4 Lymphocyte Count
- Blood Preservation
- 1107 Immunology