Hypothyroidism - StatPearls - NCBI Bookshelf
https://www.ncbi.nlm.nih.gov/books/NBK519536/
WebAug 8, 2023 · Serum TSH level is used to screen for primary hypothyroidism in most patients. In overt hypothyroidism, TSH levels are elevated, and free T4 levels are low. In subclinical hypothyroidism, TSH levels are elevated, and free T4 levels are normal.
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