Magno
Sex Hormones
LH on TRT
What the number means, why it moves on a protocol, and how it sits with related markers.
What it is
Luteinizing hormone is the brain telling the testes to make testosterone. On TRT it drops to near zero because the brain sees plenty of androgen and stops asking.
The range
How to read the lab range
Lab range roughly 1.7 to 8.6 IU/L. On TRT it reads under 1, which is expected. Very high LH with low testosterone means the testes are not answering the signal.
Why it moves on a protocol
- Testosterone from outside the body suppresses it within weeks.
- HCG does not raise LH; it stands in for it.
- After testosterone stops, it comes back over weeks to months.
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
Is LH near zero on TRT bad?
No. It is expected and usually reverses when testosterone stops. If fertility or testicle size matters to you, that is a conversation to have with your doctor.
Can LH show recovery after stopping testosterone?
Yes. LH and FSH back in range with a normal testosterone means the axis is running again.
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.