Questions about occult-blood screening for cancer.
D000368:Aged; D003110:Colonic Neoplasms / Q000175:diagnosis*; D005188:False Negative Reactions; D005189:False Positive Reactions; D006801:Humans; D007417:Intestinal Polyps / Q000175:diagnosis; D008875:Middle Aged; D009780:Occult Blood; D012004:Rectal Neoplasms / Q000175:diagnosis*; D012306:Risk