International journal of clinical practice
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Int. J. Clin. Pract. · May 2015
Changes in thyroid function with age: results from the Pizarra population-based longitudinal study.
Results of studies examining the influence of age on thyroid function and TSH levels, in the absence of thyroid disease, remain controversial. The aim of this study was to determine the course of thyroid function over 11 years in a population with normal thyroid function. ⋯ In a population free of clinical thyroid disease, TSH and FT4 values rise over the years. This increase occurs in all age groups, but depends mainly on the basal concentrations of TSH and FT4.