Colonoscopy or flexible proctosigmoidoscopy.
Stephenson
B M
BM
Finan
P J
PJ
D003113:Colonoscopy; D015179:Colorectal Neoplasms / Q000517:prevention & control*; D006801:Humans; D009780:Occult Blood; D010375:Pedigree; D011351:Proctoscopy; D012307:Risk Factors; D012812:Sigmoidoscopy