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Increased Detection of Celiac Disease with Measurement of Deamidated Gliadin Peptide Antibody Before Endoscopy

Celiac.com 08/20/2015 - Celiac disease is frequently mis-diagnosed. Even when patients received endoscopy, celiac disease is often missed or not detected.

Photo: CC-- JeanneA team of researchers recently assessed the accuracy of finger prick-based point-of-care tests in the detection of celiac disease, and developed an algorithm for diagnosis.

The research team included PD Mooney, SH Wong, AJ Johnston, M Kurien, A Avgerinos, and DS Sanders. They are variously affiliated with the Royal Hallamshire Hospital, Sheffield, United Kingdom and the University of Sheffield, Sheffield, United Kingdom.

Their team conducted a prospective study of two groups of celiac disease patients evaluated at the Royal Hallamshire Hospital in Sheffield UK from March 2013 through February 2014.

In group one, the team evaluated 55 patients at high risk for celiac disease, and who tested positive for endomysial antibody, using the Biocard test (BHR Pharmaceuticals, Nuneaton, UK) and the Celiac Quick Test (Biohit Healthcare UK, Ellesmere Port, UK), which measure antibodies to tissue transglutaminase (anti-tTG), and the Simtomax test (Tillotts Pharma, Rheinfelden, Switzerland), which measures deamidated gliadin peptide antibodies (DGP).

Group 2 included 508 consecutive patients who received an endoscopy for any reason, received the DGP test, and also were evaluated using a diagnostic algorithm that incorporated results from the DGP test and data on symptoms.

For both groups, point-of-care tests were administered at the time of endoscopy, and the results compared against results from histologic analyses of duodenal biopsy specimens from all patients.

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In group 1, the DGP test identified patients with celiac disease with 94.4% sensitivity, the Celiac Quick Test identified patients with 77.8% sensitivity (P = .03 vs the DGP test), while the Biocard test identified patients with 72.2% sensitivity (P = .008 vs the DGP test).

In group 2, the DGP test identified patients with celiac disease with 92.7% sensitivity (95% confidence interval, 83.0-97.3), 85.2% specificity (95% confidence interval, 81.5-88.3), a positive predictive value of 49.2% (95% confidence interval, 40.3-58.2), and a negative predictive value of 98.7% (95% confidence interval, 96.8-99.5).

Measurement of serum anti-tTG identified patients with celiac disease with 91.2% sensitivity (95% confidence interval, 81.1-96.4), 87.5% specificity (95% confidence interval, 84.0-90.4), a positive predictive value of 53.0% (95% confidence interval, 43.6-62.2), and a negative predictive value of 98.5% (95% confidence interval, 96.5-99.4).

The algorithm identified patients with celiac disease with 98.5% sensitivity, and has the potential to reduce duodenal biopsies by 35%. In this prospective study, the test for DGP identified celiac patients with comparable sensitivity and specificity as standard serologic analysis of anti-tTG.

Conducting the DGP test before endoscopy might increase the accuracy of the diagnosis of celiac disease.

These results look promising, but further study is needed, in lower-prevalence populations, to more accurately determine the potential benefits of the DGP test in celiac screening.


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@cyclinglady thanks for checking in Restricted diet didn't do much. Still had some VA last time they checked. Heath still otherwise fine, so RCD remains unlikely. My sxs kick in lockstep with life stress, so that kind of points to some general IBS stuff on top of celiac disease. Very doubtful I'm getting any gluten in, but fingers crossed my system is just a little hyper-vigilant, as I ponder on this thread.

I have always noticed that the table wine in Europe is pretty damn good! I am a wine lover and so is my husband but he does like his Green's beer.

The reason they set the limit at 20ppms is that through scientific study, they have proven that the vast majority of people with Celiac Disease do not have an autoimmune reaction to amounts below that......it is a safe limit for most. Also, just because that limit is set at 20ppms, does not mean that gluten-free products contain that amount of gluten. Testing for lower levels becomes more expensive with each increment down closer to 0-5ppms, which translates into higher priced products. Unless you eat a lot of processed gluten-free food, which can have a cumulative affect for some, most people do well with the 20ppm limit.

I'm in the Houston area so I'm assuming there are plenty of specialists around, though finding one that accepts my insurance might be hard. This might sound dumb, but do I search for a celiac specialist?? I'm so new to this and want to feel confident in what is/isn't wrong with my daughter. I'm with you on trusting the specialist to know the current research.

Hi VB Thats sounds like a good plan. Would it help to know that a frustrating experience in seeking diagnosis isn't unusual With your IGG result I'm sure a part of you is still wondering if they are right to exclude celiac. I know just how you feel as I too had a negative biopsy, but by then a gluten challenge had already established how severely it affected me. So I was convinced I would be found to be celiac and in a funny way disappointed not to get the 'official' stamp of approval. Testing isnt perfect, you've already learned of the incomplete celiac tests offered by some organisations and the biopsy itself can only see so much. If you react positively to the gluten free diet it may mean you're celiac but not yet showing damage in a place they've checked, or it may be that you're non celiac gluten sensitive, which is a label that for a different but perhaps related condition which has only recently been recognised and for which research is still very much underway. We may not be able to say which but the good news is all of your symptoms: were also mine and they all resolved with the gluten free diet. So don't despair, you may still have found your answer, it just may be a bit wordier than celiac! Keep a journal when you're on the diet, it may help you track down your own answers. Best of luck!