Thyroid-stimulating hormone (TSH) triggers your thyroid to release its hormones. High TSH levels usually indicate hypothyroidism and low levels, hyperthyroidism. A normal value for TSH is between 0.5 – 5.0 mIU/L. [2] X Research source If your TSH is in this range, that is a good sign; however, a normal TSH value does not completely rule out thyroid problems. TSH values on the high end of normal can indicate potential thyroid problems that are evolving. The thyroid-stimulating hormone (TSH) test measures the amount of TSH in the blood to convey how well a person’s thyroid functions. Normal levels are typically 0.4 to 4.0 milliunits per liter... Know the normal range of TSH, T3 & T4 for males, females & children. Learn how to read thyroid test reports and what abnormal results mean.