HIV-1 RNA concentrations in ARV-negative and ARV-positive blood donors. A comparison of HIV RNA concentrations in ARV-negative and ARV-positive donations from HIV-positive persons with and without evidence of ART use at the time of blood donation from 299 HIV-positive voluntary blood donations collected in the US from September 2015 through December 2017. Of the 299, 287 samples had sufficient volume for viral load testing. Each mean is represented by a red dot and 1 standard deviation by the horizontal red lines. LOQ, limit of quantitation.