Iodine intake during pregnancy: effects on thyroid function in mother and child

Autores: Suárez Rodríguez, Marta; Azcona San Julián, María Cristina; Alzina de Aguilar, Valentín
ISSN: 1575-0922
Volumen: 60
Número: 7
Páginas: 352 - 357
Fecha de publicación: 2013
Introduction: Recent studies in Spain have shown an inadequate iodine intake in a significant proportion of pregnant women. Pregnancy increases thyroid hormone requirements, and adequate iodine intake is therefore needed. Material and Methods: One hundred and forty-seven women in their third trimester (week 37) of pregnancy provided a blood sample and a 24-hour urine sample to test serum and urine iodine levels and completed a food frequency questionnaire to assess iodine intake during pregnancy. Serum TSH levels were measured in the babies born to the 140 mothers in the postpartum group. Results: Only 10.9% of pregnant women consumed more than 250 ¿g iodine daily, and 24.4% of them consumed less than 100 ¿g daily. Mean free T4 levels were 9.37 pmol/L, and 74 women (54.41%) had levels below the hypothyroxinemia threshold. TSH levels were normal in 135 newborns (96.4%), while 5 (3.6%) had levels higher than 5 ¿U/mL.