The problem with a a multiple screening test like this is that it is likely to generate at least one result that is outside the normal range in a healthy person leading to futile investigations. The pathogenesis of dermatitis herpetiformis makes it unlikely that someone would have raised IgA-tTG3 but not raised IgA-tTG2. Suspected dermatitis herpetiformis should be referred to a specialist for diagnosis. dermatitis herpetiformis causes a specific rash and symptoms - not merely hives. https://bestpractice.bmj.com/topics/en-gb/3000326

@Yaya, Vitamin supplements should be stopped eight to twelve weeks before testing blood levels.  If vitamin supplements are not stopped, the tests will reflect the vitamins in circulation in the blood stream from the supplements, and blood levels may appear within "normal" limits.  Blood tests do not reflect the amount of vitamins stored inside cells where the vitamins are actually utilized.  There can be "normal" levels in the blood, but organs and tissues may be depleted.  The brain sends messages to  tissues and organs to give up their stored vitamins so that the brain and heart don't run out.  That "excellent metabolism" is fueled by Thiamine and the other B vitamins.  Do read the articles above.   Dr. Lonsdale and Dr. Marrs' research changed my life.  Taking high dose thiamine (thiamine hydrochloride, Benfotiamine and TTFD (tetrahydrofurfuryl disulfide)) really improved my health in an impressive way.  Thiamine is water soluble and nontoxic.  Thiamine is safe in high doses.  If not needed, it's easily excreted.  If needed, the improvement will become apparent in a very short time.  No harm, no foul.  

Yes, I had COVID for 10 days thought I recovered like EV1 else, but suddenly had A-fib, hospitalized for 3 days, and now taking Flecainide 2X daily.  Long C also ruined my once excellent metabolism.  I do take B 50, and my bloodwork is always very good.   

Thanks! I don't think it was a total IGA test, it was called "Array 3X - Wheat/Gluten Proteome Reactivity & Autoimmunity" and it tested a bunch of wheat proteins and transglutaminase for both IgG and IGAs.  

Welcome to the forum, @SB04! Let's cut to the chase. Did they run a tTG-IGA and a total IGA? Total IGA goes by many names but it checks for IGA deficiency. If you are IGA deficient, IGA test scores will be artificially low and it can result in false negatives. The tTG-IGA is the centerpiece of celiac disease antibody testing.  Dermatitis herpetiformis is the epidermal expression of celiac disease. Most who have dermatitis herpetiformis also have damage happening to the small bowel lining as well but a small percentage do not. But dermatitis herpetiformis has a characteristic appearance to it, with the rash bumps having pustules in the center. It is also accompanied by a very uncomfortable itch. From what you describe, your rash doesn't sound like dermatitis herpetiformis. The IGG antibody tests are not quite as specific for celiac disease as are the IGA tests but they aren't terrible either. This may be helpful: