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

Eun Lee, MD Thyroid-stimulating hormone (TSH) prompts the thyroid gland to increase hormone production. Your body uses TSH to control thyroid hormone levels. TSH ensures you have the thyroid hormones ...

Many physicians use a serum TSH target value of 0.05-0.1 mIU/L for low-risk patients and a TSH of <0.01 mIU/L for high-risk patients. Some physicians use a low-normal range therapeutic target for ...

Subclinical hyperthyroidism is when thyroid-stimulating hormone (TSH) levels are low or undetectable, but thyroid hormone levels remain healthy. Usually, it is symptomless and may not need treatment.

Higher levels of TSH and T4 levels in a typical range may mean a risk of developing hypothyroidism in the future. If your test results show you to have low TSH levels and higher levels of T3 or T4 ...

Historically, the "quality" of a serum TSH method has been determined from a clinical benchmark - the assay's ability to discriminate euthyroid levels (~ 0.4 to 4.0 mIU/L) from the profoundly low ...

The chances of having a low or high rate of thyroid function — hypothyroidism or hyperthyroidism, respectively — increase as you age, according to a 2019 review. The TSH hormone regulates the ...