The lack of effect of ingested ferrous sulfate on the guaiac test for occult blood in the stool.
D001769:Blood; D005243:Feces; D005296:Ferrous Compounds; D006138:Guaiac; D006801:Humans; D009780:Occult Blood
D005296:Ferrous Compounds; C020748:ferrous sulfate; D006138:Guaiac
BLOOD; FECES