The fecal immunochemical test (FIT), also called an immunochemical fecal occult blood test (iFOBT), is a newer kind of stool test that also detects occult (hidden) blood in the stool. This detection is important because it can be a sign of precancerous polyps or colon cancer. Blood vessels at the surface of larger polyps or cancers are often fragile and easily damaged by passing stool. The damaged blood vessels usually release a small amount of blood into the stool, but only rarely is there enough bleeding to be visible in the stool, which is why these tests are helpful.
http://www.ccalliance.org/screening/fecal-immunochemical-tes...
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Test na krew utajoną w kale (ang. fecal occult blood test, FOBT) – metoda diagnostyczna pozwalająca na wykrycie obecności krwi, która nie wywołuje zmian makroskopowych w wyglądzie kału. W warunkach prawidłowych wydalanie krwi ze stolcem u osób dorosłych nie przekracza 0,5 – 1,5 ml/d.
https://pl.wikipedia.org/wiki/Test_na_krew_utajoną_w_kale
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tzw. nieinwazyjnych testów przesiewowych w kierunku raka jelita grubego, takich jak: immunochemiczny test na krew utajoną w kale (fecal immunochemical test – FIT) i badanie DNA w kale.
immunochemiczny test na krew utajoną w kale (FIT)
http://www.gastroenterologia-praktyczna.pl/magazine/shownumb...

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hema-screen SPECIFIC is a rapid fecal immunochemical test (FIT). This test delivers a convenient, qualitative immunoassay for the determination of human hemoglobin in feces. It is a vital tool in the diagnosis and therapy of gastrointestinal disorders. hema-screen SPECIFIC features an innovative sampling method that utilizes one card for the collection of two specimens of feces and only one immunochemical specimen preparation tube or test cassette system for analysis.
https://us.vwr.com/store/catalog/product.jsp?catalog_number=...