Webfit is one method of screening for colorectal cancer. Webrecent evidence suggests that the faecal immunochemical test (fit) can rule out colorectal cancer (crc) in symptomatic patients. To date, there is no research. Webthe fecal immunochemical test, aka fit test, detects human hemoglobin, a protein in red blood cells, in the stool. This can be an early sign of colorectal cancer.