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HIV-1 viral load measured in EDTA tubes and the corresponding plasma preparation tubes (PPTs) in two different VL categories. The PPTs (n = 14) had an average viral load (VL) of 138 copies/ml compared to the EDTA tubes (n = 14) with VL values of <50 copies/ml. In specimens (n = 28) with higher VLs (50 to 1,000 copies/ml), the EDTA tubes and corresponding PPT tubes showed averages of 419 and 815 HIV-1 copies/ml, respectively.
