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M9640760.TXT
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1996-03-04
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Document 0760
DOCN M9640760
TI Evaluation of four alternative methodologies for determination of
absolute CD4+ lymphocyte counts. The National Heart, Lung, and Blood
Institute Retrovirus Epidemiology Donor Study.
DT 9604
AU Johnson D; Hirschkorn D; Busch MP; Irwin Memorial Blood Centers, San
Francisco, CA 94118, USA.
SO J Acquir Immune Defic Syndr Hum Retrovirol. 1995 Dec 15;10(5):522-30.
Unique Identifier : AIDSLINE MED/96142214
AB Standard methods for determining absolute CD3+CD4+ T-lymphocyte
concentrations using combined results from flow cytometry and hematology
analyzers are expensive and require fresh (< 18 h old) blood. We
evaluated four new alternative methods for determining absolute CD4+
T-lymphocyte counts; (a) the FACSCount System (Becton Dickinson
Immunocytometry Systems), (b) VCS Technology/Coulter Cyto-Spheres
(Coulter Corporation), (c) Zymmune CD4/CD8 Cell Monitoring Kit (Zynaxis,
Inc.), and (d) TRAx CD4 Test Kit (T Cell Diagnostics).
EDTA-anticoagulated whole-blood specimens from HIV-seropositive patients
and anti-HIV-negative adult blood donors and staff were tested by the
standard flow cytometry method on fresh blood (0-6 postphlebotomy) and
by the four alternative methods at 0 to 6 h and 24 to 30 h
postphlebotomy. Representative specimens (< 6 h old) were tested five
times with each system to evaluate reproducibility. Correlation
coefficients for absolute CD4+ counts between standard flow cytometry
and the alternative methods ranged from 0.84 to 0.92 for both fresh and
24- to 30-h-old specimens. Average coefficient of variation for
reproducibility ranged from 4.5 to 7.1%. The four alternative CD4+
T-lymphocyte counting methods performed well relative to standard
methods. Each alternative method offers advantages over standard flow
cytometry with respect to sample throughout, required technical
expertise, and cost per result. These methods should facilitate wider
availability of low-cost CD4 counts.
DE Blood Donors Comparative Study CD4 Lymphocyte Count/*METHODS CD4-CD8
Ratio CD4-Positive T-Lymphocytes/*IMMUNOLOGY Evaluation Studies Flow
Cytometry Human HIV Seropositivity/*IMMUNOLOGY Reproducibility of
Results Support, U.S. Gov't, P.H.S. JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).