The primary autoimmune condition responsible for high levels of circulating TPO antibodies is Hashimoto's thyroiditis, also known as chronic lymphocytic thyroiditis. In this condition, the immune system mistakenly manufactures antibodies that target and attack the body's own thyroid peroxidase enzymes, which play a vital role in producing thyroid hormones. Additionally, high TPO titers can occasionally appear in patients with Graves' disease, another autoimmune disorder affecting the thyroid, highlighting how immune system dysfunctions frequently overlap within thyroid-related pathologies.
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