Magno
Thyroid
Free T3 on TRT
What the number means, why it moves on a protocol, and how it sits with related markers.
What it is
Free T3 is the active thyroid hormone, the one that sets metabolic rate. It is often the first thyroid number to fall in a hard diet.
The range
How to read the lab range
Lab range roughly 2.3 to 4.2 pg/mL (3.5 to 6.5 pmol/L).
Why it moves on a protocol
- Calorie deficit lowers it fast; eating more brings it back.
- Selenium and zinc shortfalls slow the conversion from T4.
- Growth hormone raises conversion a little.
How Magno reads it
Magno keeps every test on one line, against your lab's range, with the change since last time. Pro explains it in plain words. Get Magno for iPhone.
Read yours
Drop your lab PDF or a photo and get every marker explained in plain words. Free, no account, your file never leaves your browser. Track it in the iPhone app to see the change since your last test.
Questions people ask
Low free T3 with normal TSH?
Often diet or stress lowering conversion rather than thyroid disease. Your doctor reads it next to TSH and free T4.
Related markers
Not medical advice
This explains what the number is and why it moves. It is not medical advice; decisions belong to you and your clinician.