Thyroid Function
Normal range 80-200 ng/dL (1.2-3.1 nmol/L SI). Specimen: Serum.
Also known as: T3.
Combined adult band. LabVals does not publish separate men's, women's, or pediatric ranges for Total Triiodothyronine (Total T3); those can be narrower than the band shown.
| Specimen | Serum |
|---|---|
| Conventional range | 80-200 ng/dL |
| SI range | 1.2-3.1 nmol/L |
| Conversion factor | ×0.0154 (conventional → SI) |
| Panel | Thyroid Function |
Convert any Total Triiodothyronine (Total T3) result between units on the unit converter.
The standard teaching reference range for Total Triiodothyronine (Total T3) is 80-200 ng/dL in conventional units, or 1.2-3.1 nmol/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
What causes a high Total Triiodothyronine (Total T3)? Read as its own page
Below the range
What causes a low Total Triiodothyronine (Total T3)? Read as its own page
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