Below the range
Common causes of a low Total Triiodothyronine (Total T3)
- Hypothyroidism
- Non-thyroidal illness
Looking for the other direction? See what causes a high Total Triiodothyronine (Total T3).
All tests · Thyroid Function · Total Triiodothyronine (Total T3)
Below the range
What causes a low Total Triiodothyronine (Total T3)?
Normal range 80-200 ng/dL (1.2-3.1 nmol/L SI). Specimen: Serum. See the full Total Triiodothyronine (Total T3) reference page for critical values and nursing considerations.
What is the normal range for Total Triiodothyronine (Total T3)?
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.
| Specimen | Serum |
|---|---|
| Conventional range | 80-200 ng/dL |
| SI range | 1.2-3.1 nmol/L |
| Panel | Thyroid Function |
Full details, including nursing considerations, on the Total Triiodothyronine (Total T3) normal range page. Reference ranges vary by laboratory, method, age, sex, and population - always use the range printed on the actual result.
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