Types of thyroid tests
It measures the function of T3 hormone or free T3, which is a hormone that circulates in the blood. And the T4 type hormone that works together to measure whether these 2 hormones are working abnormally or not because T3 and T4 are mainly responsible for converting nutrients into energy for the body
The level of triiodothyronine hormone, which is also produced by the thyroid gland, is normal at around 1.4-4.4 pg/dL. Therefore, if the measured value is 3.18 ng/dL, it is considered normal.
It is a T4 independent thyroid hormone that is not bound to proteins.