How much thyroid stimulating hormone is normal

Thyroid stimulating hormone (TSH) is a hormone secreted by the pituitary gland that regulates thyroid hormones produced by our thyroid gland. TSH reference ranges vary from laboratory to laboratory, so you can refer to the reference ranges on your test sheet. If TSH levels are elevated, this should be combined with t3, t4, ft3, ft4 levels. If thyroid hormone levels are low, then hypothyroidism is considered, but if thyroid stimulating hormone levels are low and t3, t4, ft3, ft4 levels are high, then hyperthyroidism is considered, or there is some transient thyrotoxicosis caused by thyroiditis.