Which condition is NOT typically detected by screening for occult blood?

Screening for occult blood is primarily focused on detecting blood that is not visible to the naked eye, which can indicate various gastrointestinal conditions. The correct identification of hemorrhoids as a condition not typically detected by occult blood screening lies in understanding how this screening process works.

Hemorrhoids often cause visible blood in the stool or on toilet paper rather than occult blood that is hidden. While they can lead to bleeding, the presence of such blood is generally readily apparent to a patient or during a physical examination. Consequently, screening for occult blood is not necessary for diagnosing hemorrhoids because their bleeding is not hidden.

In contrast, colorectal cancer, peptic ulcers, and diverticulosis are conditions that can lead to subtle, invisible bleeding in the gastrointestinal tract, which occult blood screening aims to detect. Therefore, while being aware of the presence of blood from hemorrhoids is important for diagnosis, it is not something that the occult blood screening specifically targets.