Human immunodeficiency virus type 1 (HIV-1) plasma load discrepancies between the Roche COBAS AMPLICOR HIV-1 MONITOR version 1.5 and the Roche COBAS AmpliPrep/COBAS TaqMan HIV-1 assays

We compared plasma viral load values obtained with COBAS AMPLICOR human immunodeficiency virus type 1 (HIV-1) MONITOR version 1.5 and with COBAS TaqMan HIV-1 assays. Mean values were 4.2 and 2.9 log(10) copies/ml, respectively, showing the lack of agreement between the two assays.