• Débora Ayres Saraiva, Nathalie Anne de Oliveira E Silva de Morais, Carolina Martins Corcino, Tatiana Martins Benvenuto Louro Berbara, Annie Schtscherbyna, Mischelle Santos, Heron Botelho, Mario Vaisman, and Patrícia de Fátima Dos Santos Teixeira.
• Endocrinology Service, Clementino Fraga Filho University Hospital, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil.
• Nutrition. 2018 Sep 1; 53: 109-114.

ObjectiveTo evaluate iodine status among pregnant women from a coastal state after Brazilian governmental resolution reducing iodine concentrations in table salt. Secondarily, we correlated urinary iodine concentration (UIC) with thyroid volume and hormones.MethodsInductively coupled plasma mass spectrometry was used to assess UIC from 629 samples of 244 first trimester pregnant women. Thyroid ultrasound, serum thyroglobulin, thyrotropin, free thyroxine, and antithyroid antibodies were measured as iodine concentrations on samples of table salt from patient's home.ResultsMedian UIC was adequate (221.0 µg/L); however, 48.7% of women had insufficient (<150 µg/L), and 4.5% excessive UIC (≥500 µg/L) in at least one sample. UIC was independently and negatively correlated with age (β: -0.58; 95% confidence interval [CI], -0.89 to -0.27) and positively with multiparity (β: 0.20; 95% CI, 0.04-0.34). In those without thyroiditis, UIC tended to be positively correlated with body mass index (P = 0.098) and thyrotropin (P = 0.072). Independent variables associated with iodine insufficiency were age >30 y (odds ratio [OR] = 2.0; 95% CI, 1.2-3.2) and obesity (OR = 0.2; 95% CI, 0.2-0.7). Excessive UIC was associated negatively with age (OR = 0.2; 95% CI, 0.04-0.8) and positively with multiparity (OR = 2.5; 95% CI, 1.0-6.0) and subclinical hypothyroidism (OR = 5.6; 95% CI, 1.0-30.2).ConclusionThis population has iodine sufficiency, and supplementation should not be generally considered, based on the risk association between excessive UIC and subclinical hypothyroidism.Copyright © 2018 Elsevier Inc. All rights reserved.

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