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2. Fecal occult blood - Wikipedia

   en.wikipedia.org/wiki/Fecal_occult_blood

   Fecal occult blood testing (FOBT), as its name implies, aims to detect subtle blood loss in the gastrointestinal tract, anywhere from the mouth to the colon.Positive tests ("positive stool") may result from either upper gastrointestinal bleeding or lower gastrointestinal bleeding and warrant further investigation for peptic ulcers or a malignancy (such as colorectal cancer or gastric cancer).

3. Gastrointestinal bleeding - Wikipedia

   en.wikipedia.org/wiki/Gastrointestinal_bleeding

   Diagnosis is often based on direct observation of blood in the stool or vomit. Although fecal occult blood testing has been used in an emergency setting, this use is not recommended as the test has only been validated for colon cancer screening. [19] Differentiating between upper and lower bleeding in some cases can be difficult.

4. Blood in stool - Wikipedia

   en.wikipedia.org/wiki/Blood_in_stool

   Blood in stool looks different depending on how early it enters the digestive tract—and thus how much digestive action it has been exposed to—and how much there is. The term can refer either to melena, with a black appearance, typically originating from upper gastrointestinal bleeding; or to hematochezia, with a red color, typically originating from lower gastrointestinal bleeding. [6]

5. Stool test - Wikipedia

   en.wikipedia.org/wiki/Stool_test

   The American College of Gastroenterology has recommended the abandoning of gFOBT testing as a colorectal cancer screening tool, in favor of the fecal immunochemical test (FIT). [3] The newer and recommended tests look for globin, DNA, or other blood factors including transferrin, while conventional stool guaiac tests look for heme.

6. Have Blood In Your Stool? Here’s What It Could Mean

   www.aol.com/lifestyle/blood-stool-could-mean...

   Blood in stool: Red flags There are some symptoms that raise suspicion when they accompany blood in the stool, Dr. Bulsiewicz points out. These can include multiple bowel movements in a row with ...

7. Upper gastrointestinal bleeding - Wikipedia

   en.wikipedia.org/wiki/Upper_gastrointestinal...

   Blood may be observed in vomit or in altered form as black stool. Depending on the amount of the blood loss, symptoms may include shock. Upper gastrointestinal bleeding can be caused by peptic ulcers, gastric erosions, esophageal varices, and rarer causes such as gastric cancer. The initial assessment includes measurement of the blood pressure ...