So, let me seek some clarification here. You have not been officially diagnosed with celiac disease. Even though you had elevated ttg-iga levels on three different occasions your endoscopy/biopsy in 2021 was negative so the conclusion was that you do not have celiac disease so you have continued to consume gluten. Is this correct? However, you have officially been diagnosed with Hashimoto's. Is this correct? And you are wondering if Hashimoto's can cause elevated ttg-iga levels. Is this correct?

Referring to Anti-tissue transglutnase and then iga antibodies . If that makes sense ?  yes eating gluten 

Are you following a strict gluten-free diet? When you refer to ttg I assume you mean ttg-iga and not ttg-igg?

Does autoimmune thyroid disease (Hypothyroidism) elevate Ttg levels ? I have had 3 blood test results where ttg levels are around 39-43 (range 0-19). The first test was in 2021 before I was diagnosed with autoimmune thyroid disease. I had an endoscopy in 2021 which was negative. Diagnosed with Autoimmune thyroid disease this year and tested for celiac disease as two diseases often coexist. First results showed ttg  of 43 , total iga in range and negative for ema . Dr wanted to retest in 12 weeks and I’ve just had results with ttg dropping to 39, total iga in range but did not test EMA. The only thing that has changed between 2 and 3 test is being on levothyroxine for my thyroid. I don’t know whether I should have a second endoscopy? Dr is seeking advice from gastroenterologist. i did read that Autoimmune thyroid disease /Hashimoto disease can elevate ttg levels. Any advice please?     

thank you for the response.