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1996-03-04
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Document 0733
DOCN M9640733
TI A manual bead assay for the determination of absolute CD4+ and CD8+
lymphocyte counts in human immunodeficiency virus-infected individuals.
DT 9604
AU Carella AV; Moss MW; Provost V; Quinn TC; Department of Medicine, Johns
Hopkins University School of; Medicine, Baltimore, Maryland, USA.
SO Clin Diagn Lab Immunol. 1995 Sep;2(5):623-5. Unique Identifier :
AIDSLINE MED/96089402
AB CD4+ T lymphocytes are currently the most common surrogate marker
indicating disease progression in individuals infected with human
immunodeficiency virus (HIV). Since the cost of enumerating lymphocyte
phenotypes is quite high, an inexpensive bead assay analyzed by light
microscopy (cytosphere assay; Coulter Corporation, Hialeah, Fla.) was
developed as an alternative method for counting CD4+ and CD8+ T
lymphocytes. To evaluate the reliability of the cytosphere assay,
heparinized blood was collected from 117 HIV-infected individuals and
tested for both CD4+ and CD8+ lymphocytes by flow cytometry and the
cytosphere assay. The Pearson correlation coefficient of the cytosphere
assay compared with that of flow cytometry for CD4+ T lymphocytes was
0.93, with mean values +/- standard deviations of 534 +/- 509 by flow
cytometry and 499 +/- 477 by the cytosphere assay. The correlation
coefficient for CD8+ T lymphocytes was 0.86, with mean values of 831 +/-
543 by flow cytometry and 746 +/- 472 by the cytosphere assay. The
sensitivity and specificity of the cytosphere assay in determining
absolute CD4+ T-lymphocyte counts of less than 200/microliters were 97.6
and 94.7%, respectively. The positive predictive value was 90.9%, and
the negative predictive value was 98.6%. The cytosphere assay was highly
correlative to flow cytometry in determining CD4+ and CD8+ T-lymphocyte
counts among HIV-infected patients. The ease and limited resources
needed to perform this test make it ideal in developing countries and
other areas where technology and finances are limited.
DE Cell Separation/*METHODS Comparative Study CD4 Lymphocyte
Count/*METHODS CD8-Positive T-Lymphocytes/*IMMUNOLOGY Flow Cytometry
Human HIV Infections/*BLOOD/IMMUNOLOGY Microspheres Reproducibility
of Results JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).