Free T4 (Thyroxine)
Free T4 (Thyroxine) Normal Reference Range 3.25 – 6.21 pmol/L Test Information A balanced blend of free and protein-bound T3 circulates in the blood. T3 is associated with albumin, thyroxine-binding globulin (TBG), and albumin. Only 0.2-0.4% of the total T3 is present in the solution as unbound or free T3 (FT3) due to the binding …