NORMAL RANGES OF THYROID HORMONE

Thyroid Function TestsNormal Laboratory Values
Test
Abbreviation
Typical Ranges
Serum thyroxine
T4
4.6-12 ug/dl
Free thyroxine fraction
FT4F
0.03-0.005%
Free Thyroxine
FT4
0.7-1.9 ng/dl
Thyroid hormone binding ratio
THBR
0.9-1.1
Free Thyroxine index
FT4I
4-11
Serum Triiodothyronine
T3
80-180 ng/dl
Free Triiodothyronine l
FT3
230-619 pg/d
Free T3 Index
FT3I
80-180
Radioactive iodine uptake
RAIU
10-30%
Serum thyrotropin
TSH
0.5-6 uU/ml
Thyroxine-binding globulin
TBG
12-20 ug/dl T4 +1.8 ugm
TRH stimulation test Peak
TSH
9-30 uIU/ml at 20-30 min
Serum thyroglobulin l
Tg
0-30 ng/m
Thyroid microsomal antibody titer
TMAb
Varies with method
Thyroglobulin antibody titer
TgAb
Varies with method