the normal ranges are
Total T4 (TT4) bound and free T4 4.5 -11.5 mg/dL
Free T4 (FT4) free T4 0.8 -2.8 ng/dL
Free T4 Index (FT4I) estimate of free T4
FT4I = TT4 x RT3U 1.0 -4.3 U
Total T3 (TT3) bound and free T3 75 -200 ng/dL
Resin T3 Uptake (RT3U) binding capacity of TBG 25 -35%
TRH TRH 5 -25 mIu/mL
TSH 0.3 - 5.0 U/mL
Thyroglobulin 5-25 ng/mL
Uptake (RAIU) Distribution of radiolabeled iodine in the thyroid
5 hr – 5 to 15%
24 hr – 15 to 35%.
iodine scan will help to know the functional status of your gland. it does not mean radio ablation.
it is also done only in a certain condition. this scan will help to look for hot and cold
i hope i have answered your query