need your symptom list, your actual blood lab results including reference ranges and also the medication and the dosage that you have begun.
Diet has very little to marginal effect on antibody levels.
TPO antibodies being present means nothing unless they are elevated.
I have my thyroid labs including antibodies tested a few times over the years. TPOAb went down in the range with selenium (from Brazil nuts). TPOAb increased drastically due to hyperthyroidism and a serious hit of toxic mould. TgAb has dropped to normal but currently above the range again.
I have more time to answer. :) At the beginning you may need to test numerous times until your hormone levels are stable. It is up to you if you want to retest every year. If I'm at the doctors for whatever reason I'll add my thyroid labs/antibodies to the list of tests. I've noted state of oxidative stress raise my TPOAb.
Dr Cabot is a famous doctor here in Australia. She wrote a book called Your Thyroid Problems Solved and this book is how I first discovered selenium can lower TPOAb. This info is from her book (I edited the info) treating one of her patients. The result is a drastic reduction of TPOAb.
My TPOAb levels dropped 15% with selenium but that wasn't too bad since my diet was very poor and I had severe insulin resistance at the time.
Patient with Hashimoto's Thyroiditis:
The level of her T3 hormone is very low, whilst her T4 level is quite high; the high T4 is coming from her thyroxine medication. The body is not converting thyroxine (T4) into T3.
Free T3 = 1.1 pmol/L (2.5 - 6.0)
Free T4 = 23 pmol/L (8.0 - 22.0)
TSH = 2.0 mIU/L
Anti thyroglobulin antibodies = 80
Anti microsomal antibodies = 1200 (thyroid peroxidase antibodies)
New treatment: Patient prescribed T3 (brand name tertroxin) 20mcg three times a day, T4 100mcg a day, selenium (Dr Cabot recommends 200mcg daily), gluten and dairy free diet, bowel and liver detox.
Three months later:
Free T3 = 5.0 pmol/L (2.5 - 6.0)
Free T4 = 16 pmol/L (8.0 - 22.0)
TSH = 1.9mIU/L
Anti thyroglobulin antibodies = 40
Anti microsomal antibodies = 350