title: Black heme-positive stools without gastrointestinal hemorrhage.
mesh_terms: D001729:Bismuth; D003116:Color; D005189:False Positive Reactions; D005243:Feces / Q000032:analysis*; D005260:Female; D006471:Gastrointestinal Hemorrhage / Q000175:diagnosis*; D006418:Heme / Q000032:analysis*; D006801:Humans; D007223:Infant; D009942:Organometallic Compounds; D012459:Salicylates
chemical_list: D009942:Organometallic Compounds; D012459:Salicylates; D006418:Heme; C015715:bismuth subsalicylate; D001729:Bismuth