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Date of last update: 10/15/2017.

Forum Name: Gastroenterology Topics

Question: stool sample done at dr's office

 susieQ1 - Sat Sep 29, 2007 7:41 pm

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.
 Dr. Chan Lowe - Sat Sep 29, 2007 11:54 pm

User avatar 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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