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Dietary Reference Intakes for Vitamin A, Vitamin K, Arsenic, Boron, Chromium, Copper, Iodine, Iron, Manganese, Molybdenum, Nickel, Silicon, Vanadium, and Zinc
EAR for Boys
9–13 years
73 μg/day of iodine
14–18 years
95 μg/day of iodine
EAR for Girls
9–13 years
73 μg/day of iodine
14–18 years
95 μg/day of iodine
The RDA for iodine is set by using a CV of 20 percent (see “Adults Ages 19 Years and Older”). The RDA is defined as equal to the EAR plus twice the CV to cover the needs of 97 to 98 percent of the individuals in the group (therefore, for iodine the RDA is 140 percent of the EAR). The calculated values for RDAs have been rounded, and are in the range of 125 μg/day for a 10-year-old child as presented on the previous page.
RDA for Children
1–3 years
90 μg/day of iodine
4–8 years
90 μg/day of iodine
RDA for Boys
9–13 years
120 μg/day of iodine
14–18 years
150 μg/day of iodine
RDA for Girls
9–13 years
120 μg/day of iodine
14–18 years
150 μg/day of iodine
Adults Ages 19 Years and Older
Evidence Considered in Estimating the Average Requirement
Thyroid Iodine Accumulation and Turnover. Thyroidal radioiodine accumulation is used to estimate the average requirement. Turnover studies have been conducted in euthyroid adults (Fisher and Oddie, 1969a, 1969b). In one of these studies, the average accumulation of radioiodine by the thyroid gland for 18 men and women aged 21 to 48 years was 96.5 μg/day (Fisher and Oddie, 1969a). The second study involved 274 euthyroid subjects from Arkansas. The calculated uptake and turnover was 91.2 μg/day (Fisher and Oddie, 1969b). The accumulation of radioidine by the thyroid gland correlated well with urinary radioidine excretion. DeGroot (1966) measured iodine turnover in four normal subjects by three methods:
