HIV Ag/Ab (human immunodeficiency virus) $58.07 An antigen/antibody test performed by a lab on blood from a vein can usually detect HIV 18 to 45 days after exposure. Tests › HIV Ag/Ab (human immunodeficiency virus) Add To Cart Added! An antigen/antibody test performed by a lab on blood from a vein can usually detect HIV 18 to 45 days after exposure. You Might Also Like PSA, Total (prostate-specific antigen) $44.71 Hepatitis A Ab, IgM $45.00 RF (rheumatoid factor) $30.00 Reverse T3 $60.00 Bilirubin, Total $30.00