TSH levels higher than 4.5 mU/L usually indicate an underactive thyroid (hypothyroidism), and low TSH levels—below 0.4 ...

A low TSH in the setting of a multinodular goiter ... As shown in Table 1, it is critical to first exclude likely causes of a discordant TSH/FT4 ratio, i.e technical interference and/or binding ...

Thyroid cancer recurrence risk was not elevated among patients with high-normal vs low-normal exposure to TSH following thyroidectomy.

Eun Lee, MD In hypothyroidism, the thyroid gland fails to produce enough of the thyroid hormone thyroxine (also called T4).

Modern-day TSH methods however, with their enhanced sensitivity are also capable of detecting the low TSH values typical of hyperthyroidism. These new methods are often based on non-isotopic ...