Includes 18 member, 1.5mL per vial panel of undiluted and naturally-occurring plasma samples collected from asymptomatic blood donors from 1997 through 2008 Originated from HIV p24 Mixed Titer Performance Panel PRA204-1.5 Includes Fiebig stage and test results for 13 commercially available assays for HIV p24 antigen, HIV antigen/antibody, anti-HIV, and HIV RNA HIV p24 antigen concentration ranges from <3 to >400 pg/mL in these samples Represents Fiebig stages II through VI Preservatives free