Urinary Iodine Concentration: United States National Health and Nutrition Examination Survey 2001–2002

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Abstract
Urine iodine has been measured in the U.S. population by the National Health and Nutrition Examination Survey (NHANES) since 1971. A downward trend was noted between NHANES I (320 ± 6 µg/L in 1971–1974) and NHANES III (145 ± 3 µg/L in 1988–1994). This report presents data from NHANES 2001–2002 that indicates that the U.S. median urine iodine (UI) level has stabilized since the initial drop between NHANES I and NHANES III. The median UI concentration in the U.S. population in NHANES 2001–2002 was found to be 167.8 µg/L (95% confidence interval [CI] 159.3–177.6). The NHANES 2001–2002 data confirm the current stability of the U.S. iodine intake and continued adequate iodine nutrition for the country.