Occult-blood tests.
D005189:False Positive Reactions; D005243:Feces / Q000032:analysis; D006138:Guaiac; D006801:Humans; D008722:Methods; D009780:Occult Blood / Q000009:adverse effects; D010635:Phenolphthaleins
D010635:Phenolphthaleins; D006138:Guaiac