title: Fecal occult blood: efficacy of testing measures.
mesh_terms: D001560:Benzidines; D019411:Clinical Laboratory Techniques / Q000592:standards*; D005188:False Negative Reactions; D005189:False Positive Reactions; D005243:Feces / Q000032:analysis*; D006138:Guaiac; D006801:Humans; D009780:Occult Blood
chemical_list: D001560:Benzidines; D006138:Guaiac