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| susieQ1
- Sat Sep 29, 2007 7:41 pm |
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A stool sample taken by finger in dr's office during physical exam & checked immediately for blood. If the test is positive for blood would the blood be bright red or a dull brown? Thanks.
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| Dr. Chan Lowe
- Sat Sep 29, 2007 11:54 pm |
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 Hi SusieQ1,
The test done for blood that you are describing is commonly known as a hemacult test. It relies on a chemical reaction with the hemoglobin in the red blood cells to cause the card to turn a purple color when the chemicals are added.
It really doesn't make a distinction between fresher red blood and older dull brown blood.
Best wishes.
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