Thyroid
T3
Normal Range:80-200 ng/dL
Optimal Range:100-150 ng/dL
What is T3?
T3 (triiodothyronine) is the most active thyroid hormone. Most T3 is created when T4 is converted in your liver and other tissues.
Why T3 Matters
T3 directly affects your metabolism, heart rate, body temperature, and energy levels. It's the hormone that actually activates cellular processes.
Symptoms of Low T3
- Severe fatigue
- Muscle weakness
- Depression
- Weight gain
- Brain fog
- Cold sensitivity
Symptoms of High T3
- Rapid heart rate
- Weight loss
- Nervousness
- Increased sweating
- Heat intolerance
Reference Ranges
| Range Type | Minimum | Maximum | Unit |
|---|---|---|---|
| Normal Range | 80 | 200 | ng/dL |
| Optimal Range | 100 | 150 | ng/dL |