Medically reviewed by Kelly Wood, MD Normal thyroid-stimulating hormone (TSH) levels generally fall between 0.5 and 5.0 milliunits per liter (mU/L). If your TSH level is higher than 5.0 mU/L it ...

Low TSH. Your test result could also show lower-than-normal levels of TSH and an overactive thyroid. This could be caused by: Graves’ disease (your body’s immune system attacks the thyroid) ...

Thyroid-stimulating hormone (TSH) tells your thyroid how much thyroid hormone to make. Your TSH levels can impact a variety of bodily functions.

Thyroid level tests, including the TSH test, can determine if your thyroid is producing too much or too little thyroid hormone. Here’s what the results mean.

Low TSH levels. A low TSH is anything less than 0.5 mIU/L and typically occurs when thyroid hormone levels in the blood are too high, Kanji says.. That's because, as the brain detects high levels ...

Despite the traditional practice of using TSH levels to assess thyroid function, a better method might be to assess free thyroxine levels, ... (T4 and T3) hormone levels," she explained. ...

Types of hypothyroidism explained. ... thyroid-stimulating hormone ... as the pituitary gland normally reduces TSH levels when it detects that the thyroid has produced enough T3 and T4. ...