Normal levels fall between 0.4 to 4.5 milliunits per liter (mU/L). T3 and T4 hormones are elevated in people with thyroid storm. Thyroid storm develops abruptly and affects all the systems of your ...

Usually, it is symptomless and may not need treatment. T4 (thyroxine) is a major hormone secreted by your thyroid gland. T3 (triiodothyronine) is the active version of T4. The amount of T4 ...