The Fecal Immunochemical Test (FIT) is a screening tool used to detect blood in the stool, which can be an early sign of colorectal cancer. This test is non-invasive and typically recommended for adults over the age of 45. It works by identifying specific proteins from human blood, making it more accurate than older tests that may detect blood from other sources. Patients collect a small stool sample at home and send it to a laboratory for analysis. If the test result is positive, further evaluation, such as a colonoscopy, may be necessary to determine the cause of the bleeding. Regular screening with FIT can help in early detection and improve treatment outcomes.