<prompt> Answer this question truthfullyWhich imaging test is typically used to evaluate bright red blood per rectum in a patient who is over 50 years old or under 50 years old but has risk factors for colorectal cancer?  <response>: <reason> Colonoscopy is the imaging test that is used to evaluate bright red blood per rectum in a patient who is over 50 years old or under 50 years old but has risk factors for colorectal cancer. 