Which statement about fecal occult blood testing for colon cancer screening is correct?

Which statement about fecal occult blood testing for colon cancer screening is correct?

• A. Not sensitive
• B. Very sensitive
• C. Most sensitive
• D. Moderately sensitive

Answer: (A)

Fecal occult blood testing looks for hidden blood in the stool, which can indicate a lesion in the colon. But bleeding from colorectal cancers or polyps is often intermittent, and some lesions may not bleed at all, especially when they’re small. Stool blood can also be missed due to how the sample is collected or handled. Because of these factors, the test misses a substantial number of cancers, so it isn’t a highly sensitive screening method. It’s useful as a broad screening tool, especially when followed by colonoscopy if the test is positive, but its ability to detect cancer early is limited compared with more definitive tests like colonoscopy (and even newer FIT tests improve but do not achieve perfect sensitivity).

Fecal occult blood testing looks for hidden blood in the stool, which can indicate a lesion in the colon. But bleeding from colorectal cancers or polyps is often intermittent, and some lesions may not bleed at all, especially when they’re small. Stool blood can also be missed due to how the sample is collected or handled. Because of these factors, the test misses a substantial number of cancers, so it isn’t a highly sensitive screening method. It’s useful as a broad screening tool, especially when followed by colonoscopy if the test is positive, but its ability to detect cancer early is limited compared with more definitive tests like colonoscopy (and even newer FIT tests improve but do not achieve perfect sensitivity).