Increased levels of fecal protoporphyrin and guaiac testing.
D005189:False Positive Reactions; D005243:Feces / Q000032:analysis*; D006138:Guaiac; D006801:Humans; D009780:Occult Blood; D011166:Porphyrins / Q000032:analysis*; D011524:Protoporphyrins / Q000032:analysis*
D011166:Porphyrins; D011524:Protoporphyrins; D006138:Guaiac