What happens during a fecal occult blood test?A fecal occult blood test is a noninvasive test that you can perform at home at your convenience. Your health care provider will give you a kit that includes instructions on how to do the test. There are two main types of fecal occult blood tests: the guaiac smear method (gFOBT) and the immunochemical method (iFOBT or FIT). Below are typical instructions for each test. Your instructions may vary slightly depending on the manufacturer of the test kit.For a guaiac smear test (gFOBT), you will most likely need to:Collect samples from three separate bowel movements.For each sample, collect the stool and store in a clean container. Make sure the sample does not mix in with urine or water from the toilet.Use the applicator from your test kit to smear some of the stool on the test card or slide, also included in your kit.Label and seal all your samples as directed.Mail the samples to your health care provider or lab.For a fecal immunochemical test (FIT), you will most likely need to:Collect samples from two or three bowel movements.Collect the sample from the toilet using the special brush or other device that was included in your kit.For each sample, use the brush or device to take the sample from the surface of the stool.Brush the sample onto a test card.Label and seal all your samples as directed.Mail the samples to your health care provider or lab.Be sure to follow all the instructions provided in your kit, and talk to your health care provider if you have any questions.
