Since the earliest of times the Great Pyramid of Giza (Arab. Al Jizah) along with its 2 other main pyramids have been considered one of the wonders of the world. We're talking about a society where they didn't have cameras, You didn't see great images.
Patient care  diagnostic tools, tests, procedures. Stool guaiac test. Definition: A test that detects the presence of hidden (occult) blood in the stool. The stool guaiac is the most common form of Fecal Occult Blood test (FOBT) in use today. Brand names include: Hemoccult, Hemoccult SENSA, ColoScreen, ColoScreen-ES, Seracult, and Seracult PlusÂ®.
The guaiac-based fecal occult blood test usually picks up a daily blood loss of approximately 10 ml (about two teaspoonfuls). And the sensitivity of a single FOBT has been quoted at approximately 30%, but if 3 tests are performed (as is standard), the sensitivity rises to 92%.