Thyrotropin; Thyroid stimulating hormone
Normal values are 0.4 - 4.0 mIU/L (milli-international units per liter).
However, those without signs or symptoms of an underactive thyroid who have a TSH value over 2.0 mIU/L but normal T4 levels may develop hypothyroidism in the future. This is called subclinical hypothyroidism (mildly underactive thyroid) or early-stage hypothyroidism. Anyone with a TSH value above this level should be followed very...
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Source: ADAM Encyclopedia
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