Chart 1. Risk criteria for thyroid dysfunction during pregnancy according to the American Thyroid Association.

*History of head/neck irradiation

*Previous thyroid surgery or radioiodine therapy

*Type 1 diabetes mellitus or other autoimmune disease

*Previously known thyroid autoimmunity or presence of goiter

*History of hypo/hyperthyroidism

- Signs/symptoms of thyroid dysfunction

- Morbid obesity (BMI ≥ 40 kg m²)

- History of fetal loss, premature birth or infertility

- Use of amiodarone or lithium, or recent administration of iodinated contrast

- Family history of autoimmune thyroid disease or thyroid dysfunction

- Resident in an area with moderate to severe iodine insufficiency

- Age > 30 years

- ≥2 pregnancies

BMI: body mass index

Source: Adapted from Alexander et al. 8