Triiodothyronine (T3) is considered as one of the main hormones produced by the thyroid gland.
Another main thyroid hormone is thyroxine 4.
These two hormones work together to regulate heart rate, metabolism, and temperature of the body.
While most of the T3 hormone is dinded together with protein. While the remaining T3 that does not bind with protein is called Free T3.
When you are already detected with abnormal levels of thyroid and are on medicatins but your doctor suspects you of suffering from another thyroid-related problem this test helps to find out the cause.