TRT and Fertility: What Australian Men Need to Know Before Starting Testosterone

TRT and Fertility: What Australian Men Need to Know Before Starting Testosterone

Will testosterone therapy affect my ability to have children? The short answer is yes — exogenous testosterone reliably suppresses sperm production. But the full picture is more nuanced. With appropriate planning, most men can preserve their fertility options while still addressing testosterone deficiency.

Why TRT Suppresses Sperm Production

When exogenous testosterone is introduced, the hypothalamus detects rising levels and responds by reducing GnRH secretion. This suppresses pituitary output of both LH and FSH. Without FSH, spermatogenesis ceases or is dramatically reduced. Without LH, the testes stop producing their own testosterone and testicular volume can decrease. This occurs across all standard TRT regimens — injections, gels, or patches.

How Quickly Does Sperm Production Decline?

Suppression typically begins within weeks of commencing TRT and is often significant by 3 months. Full azoospermia develops in approximately 70% of men within 6 months, with the remainder showing severe oligozoospermia.

Does Fertility Return After Stopping TRT?

In most cases, yes — but recovery is not guaranteed. Sperm counts recover in the majority of men, with median time to recovery of approximately 3–6 months after cessation. However, recovery can take up to 2 years in some men, and 5–10% do not fully recover to pre-treatment concentrations.

The Most Important Step: Sperm Banking

If there is any possibility you may want biological children, sperm banking before commencing TRT is strongly recommended. The cost in Australia ranges from approximately $500–$800 for the initial procedure, with storage fees of $200–$400 per year. This is modest insurance relative to the cost and emotional burden of infertility treatment.

Alternatives to TRT That Preserve Fertility

Human Chorionic Gonadotrophin (HCG)

HCG is structurally similar to LH and directly stimulates the testes to produce testosterone without suppressing the HPG axis. Unlike exogenous testosterone, HCG maintains testicular function including spermatogenesis. It can be used as monotherapy for secondary hypogonadism or as co-therapy alongside standard TRT to help preserve spermatogenesis.

Selective Oestrogen Receptor Modulators (SERMs)

Clomiphene citrate and tamoxifen block oestrogen's negative feedback on the hypothalamus, stimulating endogenous testosterone production while preserving the HPG axis and spermatogenesis. Clomiphene is used off-label for this purpose in Australia, particularly for men with secondary hypogonadism and fertility concerns.

Questions to Discuss With Your GP

1. Do you have children? If not, do you plan to?
2. Have you or your partner been assessed for fertility issues?
3. Have you considered sperm banking?
4. Are you aware that TRT suppresses sperm production?
5. Do you want to discuss alternatives that preserve fertility?

TRT GP Australia and Fertility Counselling

TRT GP Australia GPs discuss fertility implications with all patients before commencing testosterone therapy. If fertility is a concern, we discuss alternatives and refer to a fertility specialist where appropriate. Join our waitlist to access a consultation when we launch in your state.

References

1. WHO Task Force. Contraceptive efficacy of testosterone-induced azoospermia. Fertil Steril. 1996;65(4):821–829.
2. Ramasamy R, et al. Recovery of spermatogenesis following testosterone replacement therapy. Asian J Androl. 2014;16(2):187–191.
3. Hsieh TC, et al. Concomitant HCG preserves spermatogenesis during TRT. J Urol. 2013;189(2):647–650.
4. Bhasin S, et al. Testosterone Therapy in Men with Hypogonadism. J Clin Endocrinol Metab. 2018;103(5):1715–1744.