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 AST (aspartate transferase) $24.14 FSH (follicle stimulating hormone) $25.86 AFP (alpha-fetoprotein) $44.42 T3, Total (triiodothyronine) $35.55 CKMB (creatine kinase-MB) $30.00