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9596770 
Journal Article 
[Iodine intake during pregnancy: effects on thyroid function in mother and child] 
Suárez Rodríguez, M; Azcona San Julián, C; Alzina de Aguilar, V 
2013 
0 
Endocrinologia y Nutricion
ISSN: 1575-0922
EISSN: 1579-2021 
60 
7 
352-357 
Spanish 
23664192 
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 μg iodine daily, and 24.4% of them consumed less than 100 μg 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 μU/mL.