Total T3
Total T3 measures the total amount of triiodothyronine in the blood, including both bound and unbound forms. T3 is the most active thyroid hormone and plays a key role in metabolism.
Category: Thyroid Panel
Also known as: total t3, t3, triiodothyronine, triiodothyronine total, ukupni t3
Reference range: 80–200 ng/dL (Source: ABIM)
Standard unit: ng/dL
High values may indicate
High total T3 may indicate hyperthyroidism, Graves' disease, early thyrotoxicosis, or elevated thyroid-binding proteins (e.g., from pregnancy or estrogen therapy).
Low values may indicate
Low total T3 may indicate hypothyroidism, severe non-thyroidal illness (sick euthyroid syndrome), malnutrition, or decreased thyroid-binding proteins.
Frequently asked questions
- What is a normal Total T3 level?
- A typical reference range for Total T3 is 80–200 ng/dL (source: ABIM). Reference ranges vary by laboratory, age, and sex, so always compare against the range on your own lab report.
- What units is Total T3 measured in?
- Total T3 is most commonly reported in ng/dL. Labs in different countries may use other units — you can convert between them with BloodId's blood test unit converter.
- Where do Total T3 reference ranges come from?
- BloodId uses ABIM standard reference ranges and educational information from MedlinePlus (see our methodology). Reference ranges still vary by lab, age, and sex, so always compare against your own report.
- Can I track Total T3 over time?
- Yes. Upload results from any lab and BloodId charts your Total T3 over time against its reference range, so you can see whether the trend is rising, falling, or stable.