Thyroid Function Tests
Normal 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 |