Magno
Sex Hormones
FSH on TRT
What the number means, why it moves on a protocol, and how it sits with related markers.
What it is
Follicle stimulating hormone drives sperm production. Like LH it falls to near zero on testosterone, which is why fertility drops on TRT.
The range
How to read the lab range
Lab range roughly 1.5 to 12 IU/L. Near zero on TRT is expected. High FSH with a normal testosterone points at the sperm-making cells, not the hormone side.
Why it moves on a protocol
- Suppressed by testosterone from outside the body.
- HCG keeps testosterone inside the testes up but does not replace FSH.
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
Will FSH recover after TRT?
Usually, over months. The longer the suppression the slower the return. If children are on the horizon, raise it with your doctor or a fertility clinic early.
Does HCG bring FSH back?
No. It mimics LH. FSH stays low.
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.