Medically reviewed by Kelly Wood, MD Normal thyroid-stimulating hormone (TSH) levels generally fall between 0.4 and 4.5 ...

High TSH levels could be a sign of hypothyroidism while low TSH levels may signal hyperthyroidism. Thyroid disorders, which affect about 20 million Americans, can be diagnosed with a TSH test ...

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.

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 ...

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 ...