Longitudinal Variability of Human Immunodeficiency Virus Type 1 RNA Viral Load Measurements by Nucleic Acid Sequence-Based Amplification and NucliSens Assays in a Large Multicenter Study

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Abstract
Human immunodeficiency virus type 1 (HIV-1) RNA measurements were evaluated within an externally controlled multilaboratory program. Three external standards (1.5 × 10 3 to 1.5 × 10 6 copies/ml) were included in 814 assay runs by four laboratories. Results indicate that HIV-1 RNA levels can be measured with a precision equal to that of the pre-highly active antiretroviral therapy era (standard deviations, ±0.16 to 0.25 log 10 units).