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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:



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