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Evaluating Commercial Test Kits for Celiac Disease

Celiac.com 03/12/2009 - The latest antihuman tissue transglutaminase (tTG) IgA tests are reported to spot celiac disease with nearly 100% sensitivity and specificity. Also, a new generation of deamidated gliadin peptide (α-DGP) antibody tests is alleged to have sensitivity levels on par with the tTG IgA tests. However, in actual practice, sensitivity and specificity for these tests are often lower than claimed for trial conditions.

A team of Columbia University researchers recently evaluated sensitivities and specificities of four commercial IgA tTG kits, along with three commercial deamidated gliadin peptide (α-DGP) kits. The team evaluated the results for four tTG IgA assays: A—Inova (Hu red blood cell); B—Binding site (rHu Ag); C—Eurospital (rHu Ag), D—Immco (rHu Ag) and three Inova α-DGP assays, E—α-DGP-IgA, F—α-DGP-IgG, and G—α-DGP-IgA+G.

The research team was made up of Afzal J. Naiyer, MD; Lincoln Hernandez, MD; Edward J. Ciaccio, PhD; Konstantinos Papadakis, MD; John S. Manavalan, MD; Govind Bhagat, MD; Peter H. R. Green, MD, all associated with the Department of Medicine and Pathology, Columbia University, New York, NY.

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The team used blood samples from four different groups of celiac disease patients and controls: Group 1 consisting of 28 patients with active celiac disease; Group 2 consisting of 54 celiac patients following a gluten-free diet; Group 3 consisting of 40 healthy controls; Group 4 consisting of 57 disease controls—17 with Crohn's disease, and 40 with chronic hepatitis. In each case, the researchers used the manufacturer's own cut-off values. They found that sensitivities and specificities of different kits ranged from 71.4% to 96.4% and 87.5% to 100%, respectively.

Compared with disease controls, sensitivity for Group 1 stayed the same, while specificity fell. All tests showed higher sensitivities for higher patient villous atrophy. The study showed that overall sensitivity was 90% or less, which is below figures reported in the literature.

Recombinant and red blood cell antigen-based tTG assays performed similarly, while the α-DGP tests showed lower values. The bottom line was that a number of factors can influence the sensitivity and specificity for these test, and that doctors should keep these facts in mind when evaluating patients.

Journal of Clinical Gastroenterology: Volume 43 (3) March 2009, pp 225-232

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I workout, but with lighter weight than normal. I never go to failure. But being tired is not one my symptoms.

Well I took test for deficiencies today won't get the results till Tuesday then I can go from there.. road to recovery

Ask them for a copy of your results and find a good gastroenterologist in your area. Go there and give them the results. That's what I did. I didn't even bother with my GP. I got the results from the health fair and called a GI in Denver. My insurance didn't require a referral. My GI was the one who put me on the track to being accurately diagnosed. And regardless, you need to be hooked up with a good GI if you've got Celiac so that they can follow you.

Also, I had my bones checked a few months back (In January), and they were awesome. I'm still shocked at how well my body did with Celiac. I hear about all of my friends on here who had crazy horrible symptoms and I never did. I'm grateful. Because those ugly things would come eventually.

I work out regularly and I would say NO to working out if you have been glutened or are really tired. You know what happens to people who work out when they are really fatigued? They suffer injuries. I was not well enough to work out until I had been gluten free for 4 years but I am much older than you so I doubt it will take 4 years for you. Drop the work-outs for now and just go for walks outside when you feel better. The fatigue has to be better before you try to do gym work. I know you didn't want to hear that but I don't want you to end up injured, on top of everything else. Take care of yourself for now and let yourself heal!