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Journal of Clinical Microbiology, September 1999, p. 2793-2797, Vol. 37, No. 9
0095-1137/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.

Automated Quantitative Analysis of Hepatitis B Virus DNA by Using the Cobas Amplicor HBV Monitor Test

Ulrika Noborg,1 Annkatrin Gusdal,1 Eva K. Pisa,2 Anders Hedrum,2 and Magnus Lindh1,*

Department of Clinical Virology, Göteborg University, Göteborg,1 and Sangtec Medical, Stockholm,2 Sweden

Received 21 January 1999/Returned for modification 16 April 1999/Accepted 15 June 1999

A highly sensitive method of quantitative analysis of hepatitis B virus (HBV) DNA in serum, the Cobas Amplicor HBV Monitor (Cobas-AM) test, was evaluated. Following a manual extraction of viral DNA, amplification, colorimetric detection, and quantitative determination are all automatically performed in the Cobas analyzer. Serially diluted samples with known HBV DNA concentrations were analyzed blindly. All samples with a virus concentration of 400 copies/ml and 83% of samples with a virus concentration of 100 copies/ml could be detected. A linear correlation between input HBV DNA and measured HBV DNA was seen in the range from 100 to 105 copies/ml. The mean coefficient of variation was 29.6% for all input levels and 18.9% for HBV DNA concentrations above 400 copies/ml. Samples with an HBV DNA level above 109 copies/ml could be reproducibly measured after predilution to 10-4 or 10-6 in negative serum; however, the level was underestimated if target DNA after dilution was still above the linear range of the assay. Quantitative results of the Cobas-AM test were interchangeable with measurements by the manual microwell plate version of Amplicor HBV Monitor (MWP-AM); the mean ratio for log Cobas-AM results/log MWP-AM results was 0.97 (standard error of the mean, 0.007) when serum samples from 153 chronic carriers were analyzed. The test should be of value for clinical assessment of chronic carriers and for monitoring the response to antiviral treatment. A limitation is the relatively narrow linear range of the assay, requiring predilution of high-titer (mainly hepatitis B e-antigen-positive) samples.

* Corresponding author. Mailing address: Department of Clinical Virology, Göteborg University, Guldhedsgatan 10B, 413 46 Göteborg, Sweden. Phone: 46 31 3424976. Fax: 46 31 827032. E-mail: magnus.lindh{at}microbio.gu.se.

Journal of Clinical Microbiology, September 1999, p. 2793-2797, Vol. 37, No. 9
0095-1137/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.


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