Doctor insights on:
Stool Guaiac Test
If you have a false positive on a stool guaiac, do you repeat the stool guaiac or proceed to colonoscopy?
Yes: If it is an upper GI bleed and you take guaiac of stool, it will take time before the blood gets there, so the initial guaiac could be negative. If the bleeding is intermittent and it stops for several days before rebleeding, the blood can be cleared and guaiac turn negative (although that takes days) then positive later. ...Read more
Is the stool test "positive" when there is only a small speck of blue-green color on the test area?
Guaiac test +: Guaiac (leuco-dye) testing has been available for >100 years--the colorless dye turns blue or green in presence of adequate amounts of peroxidase-like substances (e.g. Hemoglobin) & hydrogen peroxide. Ingested iron, certain fruits & vegetables, some drugs, toilet bowel sanitizers give false-positive reactions. Method of collection & underlying pathology may account for your + finding--see doctor. ...Read moreSee 1 more doctor answer
How accurate are the results from a colonoscopy as compared to the results from an at-home stool test?
Colonoscopy better: Two stool tests available. Guaiac for blood not accurate picking up blood from hemorrhoids. Stool test for p53 gene mutation does not tell that tumor is present but that stool shows colonocytes with potential for being associated with cancer. Obviously colonoscopy which provides direct visualization of bowel most accurate with bx available ...Read more
2 yo has black flecks in stool sometimes. He's acting & eating normal. Hemoccult test 2 months ago negative. I still worry about dry blood. Should i?
No....: The black flecks can be food related or blood related. You can have three separate stools guaiac tested as well. Take a look at diet and see what might me being digested and possibly then appearing as black flecks...Also could this 2 year old have eaten something like crayons that might be doing this? ...Read moreSee 1 more doctor answer
Vague: First provide as complete a story and data to your doctor. It may be trivial, or possibly significant. Please re-ask your question with more information. ...Read more
Stool test: It depends what the stool test is for, but it can be kept in the fridge for some time before it is trasported to the lab for testing. ...Read more
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