TRT is not a treatment to improve fertility and can substantially reduce sperm production. External testosterone suppresses the hormonal signals the testes need to make sperm and can lead to azoospermia. Sperm production often recovers after stopping, but this can take months and is not guaranteed. If you want children, say so before starting.
Why does testosterone reduce sperm production?
The brain sends two important signals to the testes: LH and FSH. These support intratesticular testosterone production and spermatogenesis.
When external testosterone is given, the brain detects adequate circulating androgen and reduces those signals. LH and FSH fall, and sperm production can fall sharply. In some men no sperm are found in the semen, known as azoospermia.
I want children: what should I do before starting?
Say so at the first consultation, whether you are trying now or expect fertility to matter in the future. If pregnancy is a near-term goal, external testosterone is often a poor choice because it suppresses the function you are trying to preserve.
This does not mean a man with symptoms and low testosterone has no options. It means the plan should focus on the cause and on fertility and may require andrology, reproductive urology or endocrinology.
Does fertility recover after stopping TRT?
Often it does, but not immediately and not identically in every man. Recovery can take months and depends on age, treatment duration, baseline testicular function and other factors.
Do not start TRT assuming fertility will definitely return by a particular date.
What can be assessed before treatment?
- Reproductive history and future fertility plans.
- Testicular history and examination.
- LH and FSH to help identify the origin of the problem.
- Semen analysis when the result would change decisions.
- Specialist assessment when infertility or an important risk factor already exists.
Should semen be frozen before TRT?
In selected cases it is reasonable to discuss semen cryopreservation before a treatment that may suppress spermatogenesis, especially if future fertility is important and recovery is uncertain. It is not an automatic recommendation for everyone.
Do not hide testosterone or anabolic-steroid use
This information completely changes how LH, FSH, testosterone and semen analysis are interpreted. Telling the clinician is about reaching the right diagnosis, not judging you.