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Blood Testing


billy

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billy Rookie

how accurate are blood tests? i just had my second negative test in two years even though i've tested myself through trial and error over the past four with textbook symptoms (i do go see my first gi doc in two weeks). has anyone else had negative bloodwork with a positive biopsy? thanks, billy


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tarnalberry Community Regular

I had mostly negative bloodwork (only a positive anti-reticulin IgG), and no biopsy - just a positive dietary challenge. Blood testing is appearing (according to some recent articles) to be less reliable than the statistics show - and this appears to be particularly true for people who don't have much damage to the villi. It's appearing (from anecdotal and other evidence) that there is a sort of "subclinical" celiac disease that is more correctly defined as gluten intolerance, without the severe intestinal damage.

Jinxy'sMom Newbie

Hi Billy. The only blood tests I had that came back as positive were the IgG and IgA. All the others were neg. I decided not to pursue a biopsy at that point because I didn't have any symptoms. Lately I have developed what I believe is DH and I'm seeing my GP Friday for a referral to the GI and I'd like to have the endoscopy done.

Guest barbara3675

Hi there----I had a negative blood test and after reading a lot about Enterolab on these message boards decided to do their most comprehensive test which included gene testing. They got back to me in less than two weeks after I sent the kit back that they had sent me and I am gluten and casein intolerant. I would not have known this if I had relied on my doctor for information. I highly recommend this kind of testing. The results come via email and are pretty comprehensive. I had already been eating gluten-free, but now am eating cf too. I have a six year old granddaughter that has celiac disease and we know it is hereditary.....and now we know where she got it from, darn. I am going to be 60 soon, I probably have had this for a long time, but just got diagnosed as I didn't have the bad gut symptoms until recently. However, I did have some of the other ones which are: migraine headaches, depression and just last winter diagnosed with fibromyalgia/which is pain all over your body in the mucles, tendons, ligaments. I feel this is all leading up to the diagnosis of gluten intolerance now/it is all linked. '

Barbara

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    • trents
      NCGS does not cause damage to the small bowel villi so, if indeed you were not skimping on gluten when you had the antibody blood testing done, it is likely you have celiac disease.
    • Scott Adams
      I will assume you did the gluten challenge properly and were eating a lot of gluten daily for 6-8 weeks before your test, but if not, that could be the issue. You can still have celiac disease with negative blood test results, although it's not as common:  Clinical and genetic profile of patients with seronegative coeliac disease: the natural history and response to gluten-free diet: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5606118/  Seronegative Celiac Disease - A Challenging Case: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9441776/  Enteropathies with villous atrophy but negative coeliac serology in adults: current issues: https://pubmed.ncbi.nlm.nih.gov/34764141/  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.
    • Xravith
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    • Scott Adams
      They may want to also eliminate other possible causes for your symptoms/issues and are doing additional tests.  Here is info about blood tests for celiac disease--if positive an endoscopy where biopsies of your intestinal villi are taken to confirm is the typical follow up.    
    • Scott Adams
      In the Europe the new protocol for making a celiac disease diagnosis in children is if their tTg-IgA (tissue transglutaminase IgA) levels are 10 times or above the positive level for celiac disease--and you are above that level. According to the latest research, if the blood test results are at certain high levels that range between 5-10 times the reference range for a positive celiac disease diagnosis, it may not be necessary to confirm the results using an endoscopy/biopsy: Blood Test Alone Can Diagnose Celiac Disease in Most Children and Adults TGA-IgA at or Above Five Times Normal Limit in Kids Indicates Celiac Disease in Nearly All Cases No More Biopsies to Diagnose Celiac Disease in Children! May I ask why you've had so many past tTg-IgA tests done, and many of them seem to have been done 3 times during short time intervals?    
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