what is the normal range for thyroid?
The normal TSH range is 0.4 to 5 milli-international units per liter (mIU/L). If your level is higher than this, chances are you have an underactive thyroid. Pregnancy can also make your TSH levels higher. If you're on medications like steroids, dopamine, or opioid painkillers (like morphine), you could also get a lower-than-normal reading. Low Levels of TSH. It's also possible that the test reading comes back showing lower than normal levels of TSH and an overactive thyroid. This could be caused by: Gravesâ disease (your bodyâs immune system attacks the thyroid) Too much iodine in your body; Too much thyroid hormone medication; Too much of a natural supplement that contains the thyroid hormone