Which autoimmune antibody is commonly associated with Hashimoto's thyroiditis?

Which autoimmune antibody is commonly associated with Hashimoto's thyroiditis?

• A. TSH receptor antibodies
• B. Antithyroglobulin antibodies
• C. Thyroid peroxidase (TPO) antibodies
• D. Thyroglobulin antibodies

Answer: (C)

Hashimoto's thyroiditis is an autoimmune destruction of the thyroid where the immune system makes antibodies against thyroid components. The most common and reliable antibody target in this condition is thyroid peroxidase, an enzyme essential for the production of thyroid hormones. Anti-thyroid peroxidase (anti-TPO) antibodies are found in the majority of patients with Hashimoto's and can be detected even before thyroid function changes, making them a sensitive marker for this autoimmune thyroiditis. Antibodies against the TSH receptor, on the other hand, are classically linked to Graves' disease, which involves overstimulation of the receptor and resulting hyperthyroidism. Antibodies to thyroglobulin can appear in Hashimoto's and other thyroid disorders, but they are less specific and less consistently present than anti-TPO antibodies. So the antibody most commonly associated with Hashimoto's is the one directed against thyroid peroxidase.

Hashimoto's thyroiditis is an autoimmune destruction of the thyroid where the immune system makes antibodies against thyroid components. The most common and reliable antibody target in this condition is thyroid peroxidase, an enzyme essential for the production of thyroid hormones. Anti-thyroid peroxidase (anti-TPO) antibodies are found in the majority of patients with Hashimoto's and can be detected even before thyroid function changes, making them a sensitive marker for this autoimmune thyroiditis.

Antibodies against the TSH receptor, on the other hand, are classically linked to Graves' disease, which involves overstimulation of the receptor and resulting hyperthyroidism. Antibodies to thyroglobulin can appear in Hashimoto's and other thyroid disorders, but they are less specific and less consistently present than anti-TPO antibodies. So the antibody most commonly associated with Hashimoto's is the one directed against thyroid peroxidase.