Thyroid Function
Normal range 2.3–4.2 pg/mL (3.5–6.5 pmol/L SI). Specimen: Serum.
Also known as: FT3.
| Specimen | Serum |
|---|---|
| Conventional range | 2.3–4.2 pg/mL |
| SI range | 3.5–6.5 pmol/L |
| Conversion factor | ×1.536 (conventional → SI) |
| Panel | Thyroid Function |
Convert any Free Triiodothyronine (Free T3) result between units on the unit converter.
The standard teaching reference range for Free Triiodothyronine (Free T3) is 2.3–4.2 pg/mL in conventional units, or 3.5–6.5 pmol/L in SI units. This value is measured in serum.
Source: Adult reference values compiled from Pagana & Pagana, Mosby's Diagnostic and Laboratory Test Reference, and Fischbach & Dunning, A Manual of Laboratory and Diagnostic Tests. Reference ranges vary by laboratory, method, age, sex, and population — always use the range printed on the actual result.
Above the range
Below the range
At the bedside
Study aid
Same panel