Which antibody is most characteristic of Hashimoto thyroiditis?

Which antibody is most characteristic of Hashimoto thyroiditis?

• A. Antibodies to thyroid peroxidase
• B. TSH receptor antibodies
• C. Anti-dsDNA
• D. Anti-centromere antibodies

Answer: (A)

Hashimoto thyroiditis is an autoimmune destruction of the thyroid, where the immune system mainly targets thyroid enzymes and proteins. The most characteristic and useful antibody in this condition is against thyroid peroxidase, an enzyme essential for thyroid hormone production. Anti-thyroid peroxidase antibodies are present in the majority of Hashimoto cases and help confirm autoimmune thyroiditis, reflecting the chronic lymphocytic infiltration and destruction that leads to hypothyroidism over time. In contrast, antibodies to the TSH receptor are typically seen in Graves disease, where they stimulate the receptor and cause hyperthyroidism. Anti-dsDNA is linked to systemic lupus erythematosus, and anti-centromere antibodies are associated with scleroderma variants like CREST. So, the presence of anti-thyroid peroxidase antibodies best characterizes Hashimoto thyroiditis.

Hashimoto thyroiditis is an autoimmune destruction of the thyroid, where the immune system mainly targets thyroid enzymes and proteins. The most characteristic and useful antibody in this condition is against thyroid peroxidase, an enzyme essential for thyroid hormone production. Anti-thyroid peroxidase antibodies are present in the majority of Hashimoto cases and help confirm autoimmune thyroiditis, reflecting the chronic lymphocytic infiltration and destruction that leads to hypothyroidism over time.

In contrast, antibodies to the TSH receptor are typically seen in Graves disease, where they stimulate the receptor and cause hyperthyroidism. Anti-dsDNA is linked to systemic lupus erythematosus, and anti-centromere antibodies are associated with scleroderma variants like CREST. So, the presence of anti-thyroid peroxidase antibodies best characterizes Hashimoto thyroiditis.