Congenital Hypothyroidism Caused by Excess Prenatal Maternal Iodine Ingestion

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The Journal of Pediatrics, 2012; DOI: 10.1016/j.jpeds.2012.05.057.

We report the cases of 3 infants with congenital hypothyroidism detected with the use of our newborn screening program, with evidence supporting excess maternal iodine ingestion (12.5 mg/d) as the etiology. Levels of whole blood iodine extracted from their newborn screening specimens were 10 times above mean control levels. Excess iodine ingestion from nutritional supplements is often unrecognized.

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