Final answer:
The test to discover blood in the stool is called a fecal occult blood test (FOBT) or stool guaiac test. It is a non-invasive test that can detect hidden blood in the stool, which is a sign of gastrointestinal bleeding.
Step-by-step explanation:
The test to discover blood in the stool is called a fecal occult blood test (FOBT) or stool guaiac test. This test is used to detect hidden or occult blood in the stool, which can be a sign of gastrointestinal bleeding, including colorectal cancer.
During the test, a small sample of stool is collected and then analyzed for the presence of blood using a chemical called guaiac. This chemical reacts with the blood and produces a blue color, indicating the presence of blood.
The FOBT is a non-invasive and simple test that can be done at home using a test kit, or it can be performed in a healthcare provider's office or lab.