FERTILITY & HPG-AXIS RESEARCH · DEEP DIVE
How Fertility Clinics Use Gonadotropins
A plain-language map of where gonadotropins sit in clinical fertility care: ovarian stimulation, the trigger shot, and restoring sperm production in men. Context, not instructions.
In 60 seconds
Fertility clinics use gonadotropins in three places: to grow several follicles for IVF, to trigger final egg maturation, and to restart sperm production in men whose pituitary is not signalling. Every step is monitored with scans and blood tests.
- Gonadotropins grow follicles, trigger egg maturation and restart sperm production.
- Every clinical cycle is guided by scans and blood tests.
- Kisspeptin is under study as a gentler IVF trigger.
What it is
An overview of the clinical settings where hCG, hMG/FSH and newer agents such as kisspeptin are used.
What researchers looked at
IVF outcomes, ovarian hyperstimulation risk and male sperm-restoration timelines in published trials and reviews.
What’s still unknown
Individual results; clinics tailor every protocol to test results.
1. Growing follicles for IVF
IVF uses higher-than-natural doses of stimulating hormones so several follicles mature at once and more eggs can be collected. FSH-type preparations (recombinant FSH or hMG) do this, with ultrasound scans and blood tests guiding each cycle. Meta-analyses comparing hMG and recombinant FSH report broadly comparable outcomes.
2. The trigger
Once follicles are ready, a trigger completes egg maturation before collection. hCG has been the classic trigger. A 2022 review describes how the choice of trigger affects luteal-phase hormones and the risk of ovarian hyperstimulation syndrome, and discusses kisspeptin — the hypothalamic peptide that drives the natural LH surge — as a newer option under study.
3. Restarting sperm production in men
When the pituitary does not release enough LH and FSH, clinics use gonadotropins to restore testosterone inside the testes and then sperm production. Published cohorts show it takes months, with a median of about 5.5 months to the first sperm in one centre. Where sperm numbers stay low, assisted techniques such as ICSI can be combined with treatment.
What a clinic checks first
Semen analysis against WHO reference ranges, hormone bloods (LH, FSH, testosterone, oestradiol, prolactin) and, for women, ovarian reserve and scans. Treatment is chosen from those results.
If you are trying to conceive or think you may have a hormone problem, the right route is a fertility clinic or an endocrinologist. They test properly (semen analysis, LH, FSH, testosterone, oestradiol) and prescribe registered medicines under monitoring. Nothing here replaces that.
KEY TAKEAWAYS
- Gonadotropins grow follicles, trigger egg maturation and restart sperm production.
- Every clinical cycle is guided by scans and blood tests.
- Kisspeptin is under study as a gentler IVF trigger.
- For treatment, see a fertility clinic.
Sources · PubMed
- Efficacy and safety of human menopausal gonadotrophins versus recombinant FSH: a meta-analysis · Reprod Biomed Online 2008 · PMID 18252052
- Clinical efficacy of highly purified hMG versus recombinant FSH in IVF/ICSI cycles: a meta-analysis · Gynecol Obstet Invest 2010 · PMID 20389096
- Use of kisspeptin to trigger oocyte maturation during in vitro fertilisation (IVF) treatment · Front Endocrinol (Lausanne) 2022 · PMID 36147569
- Predicting pregnancy and spermatogenesis by survival analysis during gonadotrophin treatment of gonadotrophin-deficient infertile men · Hum Reprod 2002 · PMID 11870114
- Clinical implications of the new 2010 WHO reference ranges for human semen characteristics · J Androl 2012 · PMID 21799140
