Are you pregnant? If yes, and if TSH is higher than 2.5, it is suggested to carry out anti-thyroid peroxidase antibody and anti-thyroglobulin antibody to further clarify whether there is autoimmune thyroiditis. If both antibodies are positive, it means Hashimoto's thyroiditis, because hypothyroidism will affect the development of the fetus, especially in the first three months of pregnancy.