Recently the American College of Gastroenterology has recommended using the fecal immunohistochemical test, called FIT, to detect blood in the stool. In terms of fecal testing, FIT is now generally considered the preferred cancer detection test. The FIT test is similar to the fecal occult blood test, FOBT, in that samples are collected and sent to a lab for testing. The test looks for the presence of blood in the stool. The main difference between FOBT and FIT is in the way that the sample is collected, and in the laboratory method used to detect the presence of blood.
If blood is detected in the lab, follow-up testing such as a colonoscopy will be required to determine the reason for blood in the stool.