Abstract
Iodine is an essential trace element for maintenance of normal thyroid function. Normal thyroid function is a prerequisite for neurocognitive development and growth in children. In the United States, iodine is not routinely added as a trace element in parenteral nutrition (PN). Our objective was to determine the prevalence of iodine deficiency and hypothyroidism in children on chronic PN. This was a cross-sectional study of children <17 years of age and using PN for >6 months at a tertiary children's hospital. Primary outcomes were spot urine iodine concentration (UIC), serum thyrotropin, and free thyroxine levels. Twenty-seven patients were identified (74% male). The median age at screening was 48 months (range: 7-213 months). The median duration on PN was 27 months (range: 11-77 months). Seventeen out of 20 patients (85%) were iodine deficient (spot UIC <100 μg/L), whereas 11 out of 20 patients (55%) were severely iodine deficient (spot UIC <20 μg/L). The prevalence of acquired hypothyroidism (elevated thyrotropin, low free thyroxine, and UIC <100 μg/L) was 33% (n = 8). None of the children with hypothyroidism screened for autoimmune thyroiditis had positive test results. There was no statistically significant association bet...Continue Reading
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