s will do Total T3, however, this is outdated and bound with protein
in the blood. You want to see the amount of the
thyroid hormone that is FREE(availabe
in the blood for uptake into the cells.) It's the t3 that the body must have to function properly. It is important to know that Synthroid is a t4 only synthetic medication that must convert in the body to T3 and the T3 is then uptaken into the cells. Most people convert t4 efficiently into the t3, however, some ( like my daughter ) do not.