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 |
Last updated on 05/21/09
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