If the results of upper endoscopy and colonoscopy are negative and occult blood persists in the stool, an upper GI series with small-bowel follow-through, CT enterography, small-bowel endoscopy (enteroscopy), capsule endoscopy (which uses a small pill-like camera that is swallowed), technetium-labeled colloid or red blood cell (RBC) scan, and angiography should be considered.