It is concluded that ferrous containing compounds can yield false positive occult blood test using the hemoccult and hematest methods in healthy sub jects. Therefore it is necessary to restrict certain fruits and vegetables before and during the collection of stool samples.
Fecal Occult Blood Testing In Hospitalized Patients With Upper
The latter test is very sensitive it picks up as little as 03 ml but it needs to be processed in a laboratory so it is much less likely to be used as a screening test.
False positive stool test. Substances in fruits and vegetables can mimic heme and cause chemical fecal occult blood tests to be falsely positive that is falsely abnormal. It is positive when there is blood in the stool. Subjects stool during the testing period the in vitro study confirms that a minimal amount on iron prep aration can produce a positive hemoccult test.
An example of a non specific result is a positive guaiac fecal occult blood fob test. A positive fecal occult blood test means that blood has been found in the stool. Your doctor will have to determine the source of the bleeding either by doing a colonoscopy or by doing an examination to determine if the bleeding is coming from the stomach or small intestine.
There are more sensitive tests than the guiac such as a heme porphyrin test or a immunochemical test but the former test is not used much due to the high false positive rate. You may need. A fecal occult blood test is considered negative if no blood is detected in your stool samples.
That can be a sign of colon cancer. If you had the test to screen for colon cancer. A fecal occult blood test is considered positive if blood is detected in your stool samples.
But it may also mean that you have hemorrhoids inflammatory bowel disease or bleeding ulcers.
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