Age ≥30 years old Family history of autoimmune thyroid disease or hypothyroidism Presence of a goitre Thyroid antibodies, primarily thyroid peroxidase antibodies Symptoms or clinical signs suggestive of thyroid hypofunction History of type 1 diabetes or other autoimmune disorders History of infertility Prior history of miscarriage or preterm delivery Previous therapeutic head or neck irradiation or prior thyroid surgery Currently receiving levothyroxine replacement Living in a region with presumed iodine deficiency
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