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) Quantity: 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. Reviews Reviewer Name Review Date Star Rating Description Posted on Etsy Product Show More