Screening tests for occult blood.
D003110:Colonic Neoplasms / Q000175:diagnosis; D005188:False Negative Reactions; D006138:Guaiac; D006801:Humans; D008551:Melena / Q000175:diagnosis; D009780:Occult Blood; D012004:Rectal Neoplasms / Q000175:diagnosis
D006138:Guaiac