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Gastroenterology (Expert Forum)
Blood Found on all three fecal stool test cards
Answered by
Kevin Pho, MD - Internal Medicine
Kevin, M.D.
Boston - MA
This forum is for questions regarding Gastroenterology issues such as Acid Reflux (GERD), Barretts Esophagus, Colitis, Colon/Bowel Disorders, Crohn's Disease, Diverticulitis/ Diverticulosis, Digestive Disorders, IBS, Stomach Pain.
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Blood Found on all three fecal stool test cards
by Gerbowman, Oct 03, 2004 12:00AM
I'm 52, male, I have IBS, had a colonoscopy four years ago which was normal.
I have had cramps, gas, my stool is not round, more rectrangular looking, sore rear when sitting, constipation and loose stools. Five or more bowel movements a day
I eat alot of salad and at least one raw onion a day. I only eat once a day, at night. I also eat tomato sauce everyday of the test.
I had a fecal stool test done, which showed blood on all three slides.
Could the raw onions,tomatoes and salad cause a false positive test?
My stools sometimes look a brownish red color, I did notice alittle what appeared to be blood in the middle of my stool.
I have NOT lost any weight and have no problems excersing everyday.
Other then stomach cramps, mostly when sitting, I feel fine.
Please advise what should be done next and what could be my problem.
I have had cramps, gas, my stool is not round, more rectrangular looking, sore rear when sitting, constipation and loose stools. Five or more bowel movements a day
I eat alot of salad and at least one raw onion a day. I only eat once a day, at night. I also eat tomato sauce everyday of the test.
I had a fecal stool test done, which showed blood on all three slides.
Could the raw onions,tomatoes and salad cause a false positive test?
My stools sometimes look a brownish red color, I did notice alittle what appeared to be blood in the middle of my stool.
I have NOT lost any weight and have no problems excersing everyday.
Other then stomach cramps, mostly when sitting, I feel fine.
Please advise what should be done next and what could be my problem.
Doctor's Answer
by Kevin Pho, MD, Oct 06, 2004 12:00AM
, Oct 06, 2004 12:00AM
Red meat, turnips, and horseradish are typicaly foods that can cause a false positive. Certainly if these were included in the salad, it may have caused the positive test.
In any case, any postive blood test over the age of 50 warrants further evaluation. Although the likelihood of cancer would be less with a negative colonoscopy 4 years ago, it would be prudent to discuss repeating it, to ensure that nothing has grown in the interim. Another option would be a flexible sigmoidoscopy, which would be a better tolerated procedure.
I would discuss this with a GI referral.
Followup with your personal physician is essential.
This answer is not intended as and does not substitute for medical advice - the information presented is for patient education only. Please see your personal physician for further evaluation of your individual case.
Kevin, M.D.
Medical Weblog:
kevinmd_b
In any case, any postive blood test over the age of 50 warrants further evaluation. Although the likelihood of cancer would be less with a negative colonoscopy 4 years ago, it would be prudent to discuss repeating it, to ensure that nothing has grown in the interim. Another option would be a flexible sigmoidoscopy, which would be a better tolerated procedure.
I would discuss this with a GI referral.
Followup with your personal physician is essential.
This answer is not intended as and does not substitute for medical advice - the information presented is for patient education only. Please see your personal physician for further evaluation of your individual case.
Kevin, M.D.
Medical Weblog:
kevinmd_b
Member Comments
by John1999, Oct 20, 2008 05:34AM
A related discussion, Positive Occult Stool Test was started.
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