Serum thyroid hormones were measured in Montreal, Canada (urinary iodine 446 +/- 164 micrograms/day) and Zagreb, Yugoslavia (urinary iodine 108 +/- 32 microgram/day). The serum concentrations of thyroxine and triiodothyronine in the two populations were almost identical. We conclude that dietary iodine, within accepted normal limits, is not a factor in determining serum thyroid hormone levels. The wide differences in reported serum triiodothyronine concentrations are related to methodological problems.
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