/WHAT_IT_IS
Luteinizing hormone (LH) is released by the pituitary gland and signals the testes to produce testosterone. On TRT it falls to near-zero because exogenous testosterone shuts down the HPTA.
/NORMAL_RANGE
Adult male reference: 1.7–8.6 mIU/mL.
What does high LH mean?
- +Primary hypogonadism (testicular failure) — testes can't respond, pituitary keeps shouting.
- +Pituitary tumor (rare).
What does low LH mean?
- +Exogenous testosterone (TRT, AAS) — the most common cause.
- +Secondary hypogonadism (pituitary or hypothalamic problem).
- +Hyperprolactinemia.
/ON_TRT
LH almost always reads <1.0 mIU/mL on TRT — that's expected and not a problem in itself. Men trying to preserve fertility add hCG (which mimics LH) to maintain intratesticular testosterone production. If you're planning to come off TRT, monitoring LH recovery is part of the restart protocol.
/RELATED
FAQ
/01Will LH come back after stopping TRT?+
For most men, yes — but it can take 3–12 months, and a small percentage don't fully recover. The longer you've been on TRT and the higher the dose, the longer recovery typically takes. Restart protocols often use clomiphene or hCG to accelerate recovery.
Track LH in the app.
Upload your lab PDF — MyTRT extracts every marker with Gemini Vision. Charts, trends, and TRT-aware insights. Free on iOS and Android.