a process for the determination of h . pylori in a fecal specimen comprising dispersing a fecal specimen suspected of carrying h . pylori in a sample diluent ; contacting the fecal specimen in the diluent with a first polyclonal antibody for h . pylori antigen to form a complex of the antibody and the antigen ; separating said specimen and said complex ; exposing the complex to a second polyclonal antibody for said antigen and a portion of the antibody reacting with said complex , one of said first and second antibody being bound to a solid carrier and the other being labeled with a detection agent ; and determining the amount of the labeled antibody and in turn determining the presence of h . pylori antigen in said fecal specimen .