The free T4 (FT4) test measures the concentration of free thyroxine, the only biologically active fraction, in the serum (about 0.05% of the total T4). The free thyroxine is not affected by changes
| # | Retailer | Lab | Seen | Price | |
|---|---|---|---|---|---|
| 1 | DiscountedLabs seen today | — | today | $63 | order → |
| Reverse T3 Test | 11 retailers | $18 |
| T3 Total | 9 retailers | $8 |
| THYROID Stimulating Hormone-TSH | 8 retailers | $31 |
| Thyroid Test | 7 retailers | $50.95 |
| T3 Uptake | 7 retailers | $5 |
| TSH Antibody | 6 retailers | $79 |
| Thyroglobulin Panel | 5 retailers | $25 |
| Thyroid Panel | 5 retailers | $35 |