Urinary iodine levels in the US population are declining according to national health surveys, potentially putting people at risk for thyroid problems. Monitoring of iodine through NHANES shows median levels dropping due to less iodine in salt. Continued decrease in iodization could lead to health issues if the downward trend is not addressed.

1. Urinary Iodine levels
• Monitoring of iodine levels
through NHANES can
provide a warning of thyroid
deficiency trends
• Studies show that median
iodine levels in the
population are dropping
due to decreased food
iodization from salt
• Health problems could
occur if trend continues
Comparison of Median Urinary Iodine Concentration by Gender and
Survey, NHANES I and III (Using Same Analytical Method)
0
50
100
150
200
250
300
350
400
NHANES I (1971-1974) NHANES III (1988-1994)
MedianUrinaryIodineConcentration(ug/L)
Total Male Female