What is the role of thyroid-stimulating hormone (TSH) measurement in the diagnosis of subacute thyroiditis?

Updated: Mar 23, 2021
  • Author: Stephanie L Lee, MD, PhD; Chief Editor: Romesh Khardori, MD, PhD, FACP  more...
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Answer

The most reliable measure of thyroid function is thyroid-stimulating hormone (TSH). In hyperthyroidism, the TSH is typically suppressed to levels that are not measurable (< 0.05 μIU/mL). The degree of thyrotoxicosis, however, cannot be estimated with a TSH level and must instead be measured by the thyroid hormone (T3 and T4) levels in the plasma.


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