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Tracking Hormone Disorders

Tracking Hormone Disorders

Tracking hormone levels in populations provides information on trends and changes of these levels over time. This information may help identify potential causes for hormone level changes in populations, including exposure to environmental chemicals that can affect the endocrine system.

Tracking Thyroid Hormone Function

The Tracking Network uses data from CDC’s National Health and Nutrition Examination Survey (NHANES) to track levels of thyroid hormones in the U.S. population. NHANES data comes from a nationally-representative sample of the U.S. population. This data provides information about the nation as a whole rather than individual counties or states.

Data available on the Tracking Network on thyroid hormone function can be used to:

  • Provide reference levels of thyroid hormone levels in the US population
  • Provide trends over time of thyroid hormone levels in the US population
  • Provide information on adequacy of iodine levels in US population and inform interventions for iodine inadequacy (e.g., requirements for supplements)
  • Provide trends of urinary iodine levels over time in the US populations

Some limitations of the data and measures on the Tracking Network are:

  • The measures cannot be used to provide population reference levels or trends over time for thyroid in children younger than 12 years, as NHANES did not measure thyroid hormones in children younger than 12 years.
  • The measures cannot be used to provide population reference levels or trends over time for thyroid hormones or urinary iodine in pregnant women as not enough pregnant women were sampled to produce population-based estimates of thyroid hormones or urinary iodine for pregnant women.
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