Fecal immunochemical test

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Fecal immunochemical test
Faecal Immunochemical Testing.jpg
Faecal Immunochemical Testing

Fecal Immunochemical Test (FIT) is a diagnostic technique that examines stool samples for traces of non-visible blood, which could potentially indicate conditions including colorectal cancer (also known as bowel cancer). Symptoms which could be caused by bowel cancer and suggest an FIT include a change in bowel habit, anaemia, unexplained weight loss, and abdominal) pain.[1][2][3]

A 2022 UK guideline recommends the use of a FIT threshold of fHb ≥10 µg Hb/g to select patients with symptoms for an urgent referral for colorectal cancer investigation.[4]


  1. "Bowel Cancer: Testing for blood in your poo using the FIT test". Cancer Research UK. 6 December 2021. Archived from the original on 1 November 2022. Retrieved 3 December 2022.
  2. Quintero, Enrique; Castells, Antoni; Bujanda, Luis; et al. (23 February 2012). "Colonoscopy versus Fecal Immunochemical Testing in Colorectal-Cancer Screening". New England Journal of Medicine. Massachusetts Medical Society. 366 (8): 697–706. doi:10.1056/nejmoa1108895. ISSN 0028-4793.
  3. "Fecal immunochemical test (FIT): MedlinePlus Medical Encyclopedia". medlineplus.gov. Archived from the original on 2022-11-07. Retrieved 2022-12-03.
  4. Monahan KJ, Davies MM, Abulafi M, et al, Faecal immunochemical testing (FIT) in patients with signs or symptoms of suspected colorectal cancer (CRC): a joint guideline from the Association of Coloproctology of Great Britain and Ireland (ACPGBI) and the British Society of Gastroenterology (BSG) Archived 2022-11-27 at the Wayback Machine, Gut 2022;71:1939-1962