Abstract:
: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.
journal_name
Viral Immunoljournal_title
Viral immunologyauthors
Plate MM,Louzao R,Steele PM,Greengrass V,Morris LM,Lewis J,Barnett D,Warrino D,Hearps AC,Denny T,Crowe SMdoi
10.1089/vim.2009.0027subject
Has Abstractpub_date
2009-10-01 00:00:00pages
329-32issue
5eissn
0882-8245issn
1557-8976journal_volume
22pub_type
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