From Clinical Thyroidology® for the Public: TSH and FT4 tests are commonly ordered to evaluate patients for possible thyroid problems. Currently, laboratories use the same normal range for TSH and FT4 for all adults, regardless of age. However, some research suggests that TSH and FT4 levels may change with age. The goal of this study was to establish age- specific normal reference ranges for TSH and FT4. Read More…
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