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The faecal occult blood (FOB) test detects small amounts of blood in your faeces, which you would not normally see or be aware of.
There are several disorders which may cause bleeding into the gut (intestine) - for example, gastric or duodenal ulcers, ulcerative colitis, bowel polyps and bowel (colorectal) cancer.
You obtain a sample by using a small scraper to scrape some stool off toilet tissue which you have just used after going to the toilet.
Usually two or three FOB tests are done on two or three separate stool samples, obtained on different days. This is because a bleeding disorder of the gut (intestine) may only bleed now and then.
