Medically reviewed by Kelly Wood, MD If you have hypothyroidism with normal TSH levels, you may still experience symptoms ...

Medically reviewed by Isabel Casimiro, MD, PhD A TSH test measures the level of thyroid-stimulating hormone in your blood.

Early symptoms can include weight gain and fatigue ... If you have hyperthyroidism, your TSH levels will be low, as your body is trying to stop excessive thyroid hormone production.

Serum concentration rises in pregnancy, producing an enlarged thyroid without clinical symptoms of goiter ... is evaluated if TSH is abnormally high or low. Low TSH with a high FT4 or FT4I ...

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 ...