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Journal of Clinical Microbiology, March 2000, p. 1113-1120, Vol. 38, No. 3
0095-1137/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

Quantitative and Cost Comparison of Ultrasensitive Human Immunodeficiency Virus Type 1 RNA Viral Load Assays: Bayer bDNA Quantiplex Versions 3.0 and 2.0 and Roche PCR Amplicor Monitor Version 1.5

Tarek Elbeik,1,2,* Edwin Charlebois,3 Patricia Nassos,1,2 James Kahn,3,4 Frederick M. Hecht,3,4 David Yajko,1,2 Valerie Ng,1,2 and Keith Hadley1,2

Departments of Laboratory Medicine1 and Medicine,3 University of California, San Francisco, and Clinical Laboratories2 and Positive Health Program,4 San Francisco General Hospital, San Francisco, California

Received 15 July 1999/Returned for modification 22 October 1999/Accepted 24 December 1999

Quantification of human immunodeficiency virus type 1 (HIV-1) RNA as a measure of viral load has greatly improved the monitoring of therapies for infected individuals. With the significant reductions in viral load now observed in individuals treated with highly active anti-retroviral therapy (HAART), viral load assays have been adapted to achieve greater sensitivity. Two commercially available ultrasensitive assays, the Bayer Quantiplex HIV-1 bDNA version 3.0 (bDNA 3.0) assay and the Roche Amplicor HIV-1 Monitor Ultrasensitive version 1.5 (Amplicor 1.5) assay, are now being used to monitor HIV-1-infected individuals. Both of these ultrasensitive assays have a reported lower limit of 50 HIV-1 RNA copies/ml and were developed from corresponding older generation assays with lower limits of 400 to 500 copies/ml. However, the comparability of viral load data generated by these ultrasensitive assays and the relative costs of labor, disposables, and biohazardous wastes were not determined in most cases. In this study, we used matched clinical plasma samples to compare the quantification of the newer bDNA 3.0 assay with that of the older bDNA 2.0 assay and to compare the quantification and costs of the bDNA 3.0 assay and the Amplicor 1.5 assay. We found that quantification by the bDNA 3.0 assay was approximately twofold higher than that by the bDNA 2.0 assay and was highly correlated to that by the Amplicor 1.5 assay. Moreover, cost analysis based on labor, disposables, and biohazardous wastes showed significant savings with the bDNA 3.0 assay as compared to the costs of the Amplicor 1.5 assay.

* Corresponding author. Mailing address: San Francisco General Hospital, Department of Laboratory Medicine, 1001 Potrero Ave., NH, Room 2M35, San Francisco, CA 94110. Phone: (415) 476-4604. Fax: (415) 206-3045. E-mail: elbeik{at}itsa.ucsf.edu.

Journal of Clinical Microbiology, March 2000, p. 1113-1120, Vol. 38, No. 3
0095-1137/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.


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