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Can A Colonoscopy Show Celiac?


Leslie-FL

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Leslie-FL Rookie

I was never tested for Celiac because I felt so much better after going gluten-free that I couldn't bear the thought of going back to how I had felt before in order to have a test done. I am overdue, though, for my every-five-year colonoscopy (colon cancer runs in my family, so my doctor recommends having them done). I was wondering if there would be any films or anything like that on file from my last one, that maybe my doctor could use as comparison to check the status of the villi. Does anyone know if Celiac can be diagnosed this way, without having to go back on gluten? My last colonoscopy was probaby 8 years ago, long before I realized that my problem was gluten.


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Lisa Mentor
I was never tested for Celiac because I felt so much better after going gluten-free that I couldn't bear the thought of going back to how I had felt before in order to have a test done. I am overdue, though, for my every-five-year colonoscopy (colon cancer runs in my family, so my doctor recommends having them done). I was wondering if there would be any films or anything like that on file from my last one, that maybe my doctor could use as comparison to check the status of the villi. Does anyone know if Celiac can be diagnosed this way, without having to go back on gluten? My last colonoscopy was probaby 8 years ago, long before I realized that my problem was gluten.

Celiac is classically diagnosed by flattening of the villi in the small intestines, scalloping and by biopsy. None of this can be viewed or sampled during a colonoscopy.

Anytime there is a strong history of digestive issues, it's wise to have annual testing of the colon. Testing of the large intestines can look for Crohn's Disease and other issues.

If I were in your shoes (and I know what I know now), if you feel better on the gluten free diet, I see no reason to return to gluten, testing or no testing.

kbtoyssni Contributor

No, a colonoscopy won't show anything celiac-related. If you're itching for a diagnosis at this point, your best bet is probably the gene test. You won't have to go back on gluten for it. Of course, you may or may not have the known celiac genes. If you don't, I'm guessing you still won't start eating gluten so it's probably not worth it.

EDIT: Actually, based on your joining date here, have you been gluten-free for less than a year? If so, enterolab can still do a stool test for gluten intolerance without you having to go back on gluten.

nora-n Rookie

I think I read that Dr. Fine of enterolab had researched microscopic colitis for years and discovered that it really comes from gluten intolerance, and that is why he invented the Enterolab stool test for gluten sensitivity.

One would have to mail him or his nurse to get an answer.

The previous poster wrote that enterolab can detect the antigliadin antibodies is a stool test for a while after going gluten-free. But not celiac.

There migh be something about microscopic colitis and gluten on the enterolab website and in the patent application that is online somewhere.

nora

Leslie-FL Rookie
No, a colonoscopy won't show anything celiac-related. If you're itching for a diagnosis at this point, your best bet is probably the gene test. You won't have to go back on gluten for it. Of course, you may or may not have the known celiac genes. If you don't, I'm guessing you still won't start eating gluten so it's probably not worth it.

EDIT: Actually, based on your joining date here, have you been gluten-free for less than a year? If so, enterolab can still do a stool test for gluten intolerance without you having to go back on gluten.

I actually went gluten free in April of 2007, but it took me awhile to join the forums.

Thank you to everyone for your input. It's true that I'm less interested in a diagnosis than in going back on gluten to get one. lol. Too many years of feeling awful - don't want to go back to that. :-)

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    • Scott Adams
      The first set of results show two positive results for celiac disease, so at the very least it looks like you could have it, or at the least NCGS.   Approximately 10x more people have non-celiac gluten sensitivity than have celiac disease, but there isn’t yet a test for NCGS. If your symptoms go away on a gluten-free diet it would likely signal NCGS.      
    • Scott Adams
      Elevated tissue transglutaminase IgA (tTG-IgA) levels are highly specific for celiac disease, and they are a key biomarker used in its diagnosis. However, there are some rare instances where elevated tTG-IgA levels have been reported in conditions other than celiac disease. While these cases are not common, they have been documented in the literature. Below are some examples and references to studies or reviews that discuss these scenarios:  1. Non-Celiac Gluten Sensitivity (NCGS)    - NCGS typically does not cause elevated tTG-IgA levels, as it is not an autoimmune condition. However, some individuals with NCGS may have mild elevations in tTG-IgA due to intestinal inflammation or other factors, though this is not well-documented in large studies.    - Reference: Catassi, C., et al. (2013). *Non-Celiac Gluten Sensitivity: The New Frontier of Gluten-Related Disorders*. Nutrients, 5(10), 3839–3853. [DOI:10.3390/nu5103839](https://doi.org/10.3390/nu5103839)  2. Autoimmune Diseases    - Elevated tTG-IgA levels have been reported in other autoimmune conditions, such as type 1 diabetes, autoimmune hepatitis, and systemic lupus erythematosus (SLE). This is thought to be due to cross-reactivity or polyautoimmunity.    - Reference: Sblattero, D., et al. (2000). *The Role of Anti-Tissue Transglutaminase in the Diagnosis and Management of Celiac Disease*. Autoimmunity Reviews, 1(3), 129–135. [DOI:10.1016/S1568-9972(01)00022-3](https://doi.org/10.1016/S1568-9972(01)00022-3)  3. Chronic Liver Disease    - Conditions like chronic hepatitis or cirrhosis can sometimes lead to elevated tTG-IgA levels, possibly due to increased intestinal permeability or immune dysregulation.    - Reference: Vecchi, M., et al. (2003). *High Prevalence of Celiac Disease in Patients with Chronic Liver Disease: A Role for Gluten-Free Diet?* Gastroenterology, 125(5), 1522–1523. [DOI:10.1016/j.gastro.2003.08.031](https://doi.org/10.1016/j.gastro.2003.08.031)  4. Inflammatory Bowel Disease (IBD)    - Some patients with Crohn’s disease or ulcerative colitis may have elevated tTG-IgA levels due to intestinal inflammation and damage, though this is not common.    - Reference: Walker-Smith, J. A., et al. (1990). *Celiac Disease and Inflammatory Bowel Disease*. Journal of Pediatric Gastroenterology and Nutrition, 10(3), 389–391. [DOI:10.1097/00005176-199004000-00020](https://doi.org/10.1097/00005176-199004000-00020)  5. Infections and Parasites    - While infections (e.g., giardiasis) are more commonly associated with false-positive tTG-IgA results, chronic infections or parasitic infestations can sometimes lead to elevated levels due to mucosal damage.    - Reference: Rostami, K., et al. (1999). *The Role of Infections in Celiac Disease*. European Journal of Gastroenterology & Hepatology, 11(11), 1255–1258. [DOI:10.1097/00042737-199911000-00010](https://doi.org/10.1097/00042737-199911000-00010)  6. Cardiac Conditions    - Rarely, heart failure or severe cardiovascular disease has been associated with elevated tTG-IgA levels, possibly due to gut ischemia and increased intestinal permeability.    - Reference: Ludvigsson, J. F., et al. (2007). *Celiac Disease and Risk of Cardiovascular Disease: A Population-Based Cohort Study*. American Heart Journal, 153(6), 972–976. [DOI:10.1016/j.ahj.2007.03.019](https://doi.org/10.1016/j.ahj.2007.03.019)  Key Points: - Elevated tTG-IgA levels are highly specific for celiac disease, and in most cases, a positive result strongly suggests celiac disease. - Other conditions causing elevated tTG-IgA are rare and often accompanied by additional clinical findings. - If celiac disease is suspected, further testing (e.g., endoscopy with biopsy) is typically required for confirmation. If you’re looking for more specific studies, I recommend searching PubMed or other medical databases using terms like "elevated tTG-IgA non-celiac" or "tTG-IgA in non-celiac conditions." Let me know if you’d like help with that!
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    • trents
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    • Jack Common
      Hello! I want to share my situation. I had symptoms like some food intolerance, diarrhea, bloating, belching one year ago. I thought I could have celiac disease so I did the blood tests. The results were ambiguous for me so I saw the doctor and he said I needed to do tests to check whether I had any parasites as well. It turned out I had giardiasis. After treating it my symptoms didn't disappear immediately. And I decided to start a gluten free diet despite my doctor said I didn't have it. After some time symptoms disappeared but that time it wasn't unclear whether I'd had them because of eliminating gluten or that parasite. The symptoms for both are very similar. Giardiasis also damages the small intestine. The only way to check this was to start eating bread again as I thought. Now about my results.   These are my first test results (almost a year ago) when I had symptoms: The Tissue Transglutaminase IgA antibody - 0.5 U/ml (for the lab I did the tests 0.0 - 3.0 is normal) The Tissue Transglutaminase IgG antibody - 6.6 U/ml (for the lab I did the tests 0.0 - 3.0 is normal) Immunoglobulin A - 1.91 g/l (for the lab I did the tests 0.7 to 4 g/l is normal) IgA Endomysial antibody (EMA) - < 1:10 titer (for the lab I did the tests < 1:10 titer is normal) IgG Endomysial antibody (EMA) - < 1:10 titer (for the lab I did the tests < 1:10 titer is normal) Deamidated gliadin peptide IgA - 0.3 U/ml (for the lab I did the tests 0.0 - 6.0 is normal) Deamidated gliadin peptide IgG - 46.1 U/ml (for the lab I did the tests 0.0 - 6.0 is normal)   Then I didn't eat gluten for six months. Symptoms disappeared. And I started a gluten challenge. Before the challenge I did some tests. My results: The Tissue Transglutaminase IgG antibody - 0.5 U/ml (for the lab I did the tests < 20 U/ml is normal)) Deamidated gliadin peptide IgG - 28 U/ml (for the lab I did the tests < 20 U/ml is normal)   During the challenge I ate 6 slices of wheat bread. After the challenge my results are: The Tissue Transglutaminase IgA antibody - 2.0 U/ml (for the lab I did the tests < 20 U/ml is normal) The Tissue Transglutaminase IgG antibody - 2.0 U/ml (for the lab I did the tests < 20 U/ml is normal) Immunoglobulin A - 1.31 g/l (for the lab I did the tests 0.7 to 4 g/l is normal) Deamidated gliadin peptide IgA - 2.0 U/ml (for the lab I did the tests < 20 U/ml is normal) Deamidated gliadin peptide IgG - 2.13 U/ml (for the lab I did the tests < 20 U/ml is normal)   To be sure I continued consuming gluten. I ate a lot each day. Two months after I did the tests again. My results I got today are: The Tissue Transglutaminase IgA antibody - 0.7 U/ml (for the lab I did the tests < 20 U/ml is normal) Immunoglobulin A - 1.62 g/l (for the lab I did the tests 0.7 to 4 g/l is normal) Deamidated gliadin peptide IgG - 25.6 U/ml (for the lab I did the tests < 20 U/ml is normal)   Nowadays I didn't have any symptoms except tiredness but I think it's just work. I think it was this parasite because two years ago, for example, and before I didn't have these symptoms and I always ate gluten food. But I'm still not sure especially because the Deamidated gliadin peptide IgG results are sometimes high. What do you think? @Scott Adams
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