# Brazil thyroid health guidelines during pregnancy

> Live situation record from CLSTR: https://clstr.news/situations/brazil-thyroid-health-guidelines-during-pregnancy
> Updated: 2026-09-12T22:30:36.000Z. Sources: 18. Developments: 2.

Medical guidelines and nutritional considerations regarding thyroid health during pregnancy in Brazil have been clarified. 

The Brazilian Society of Endocrinology and Metabology (SBEM) and the Brazilian Federation of Gynecology and Obstetrics (Febrasgo) updated their recommendations to state that pregnant women with positive anti-TPO antibodies but normal T4 levels should no longer receive preventive synthetic hormone treatment, such as levothyroxine. This change follows studies indicating that preventive treatment in these cases does not reduce miscarriage or premature birth risks. While Brazil will maintain early screening for all pregnant women to monitor for hypothyroidism, the approach differs from the American Thyroid Association by not using selective screening based on risk factors.

Regarding nutrition, specialists have noted that while the American Thyroid Association recommends iodine supplementation for pregnancy, this may not be necessary for most Brazilians due to national laws requiring iodized salt. Supplementation in Brazil may be limited to specific groups with restricted iodine diets, such as vegans or individuals with certain medical conditions like hypertension or heart failure. Experts have also cautioned against the use of Lugol’s solution, noting that excessive iodine intake can interfere with fetal thyroid function.

## Timeline

### 2026-09-12: Thyroid health and iodine use during pregnancy

Medical specialists discuss thyroid changes during pregnancy, noting that while iodine supplementation is recommended in some regions, Brazil's iodized salt typically meets most nutritional needs.

2 sources. https://clstr.news/cluster/thyroid-health-and-iodine-use-during-pregnancy

### 2026-08-28: Brazil updates thyroid treatment guidelines for pregnant women

Brazilian medical societies have updated guidelines to stop preventive hormone treatment for pregnant women with positive anti-TPO antibodies if their thyroid function remains normal.

16 sources. https://clstr.news/cluster/brazil-updates-thyroid-treatment-guidelines-for-pregnancy

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Cite as: Brazil thyroid health guidelines during pregnancy. CLSTR, https://clstr.news/situations/brazil-thyroid-health-guidelines-during-pregnancy