Understanding Male Factor Infertility

Male factor infertility contributes to roughly 40–50% of all infertility cases and is the sole cause in about 20% of couples. Yet many men delay evaluation, often spending years focused on female factor interventions before addressing male fertility.

A complete male fertility evaluation includes:

  • Semen analysis (count, motility, morphology per WHO 2021 criteria)
  • Sperm DNA fragmentation index (DFI) — measures genetic damage in sperm
  • Hormonal evaluation (FSH, LH, testosterone, estradiol)
  • Physical examination for varicocele
  • Genetic testing (karyotype, Y-chromosome microdeletions) when indicated

When ICSI Is the Answer

Intracytoplasmic Sperm Injection (ICSI) revolutionized male factor treatment. Rather than mixing sperm with eggs in a dish (conventional IVF), embryologists inject a single sperm directly into each mature egg.

ICSI Success Rates

ICSI does not bypass poor egg quality — fertilization rates with ICSI average 70–80% when egg quality is normal. Live birth rates depend heavily on female age and embryo quality, not solely on sperm parameters.

  • Severe oligospermia (<5 million sperm/mL)
  • Asthenozoospermia with <1% progressive motility
  • Teratozoospermia with <1% normal forms
  • Failed conventional IVF (low or zero fertilization)
  • High sperm DNA fragmentation (DFI >30%)
  • Azoospermia requiring surgical sperm retrieval (TESE, micro-TESE)

Surgical Sperm Retrieval

For men with obstructive azoospermia (blockage) or non-obstructive azoospermia (no sperm in ejaculate), surgical retrieval may yield usable sperm:

Procedure 适用情况 成功率
TESE (Testicular Sperm Extraction) Obstructiveazoospermia 90%+获取率
Micro-TESE (Microscopic TESE) Non-obstructive azoospermia 40–60%获取率
PESA (Percutaneous Epididymal Sperm Aspiration) Obstructiveazoospermia 80%+获取率
MESA (Microsurgical Epididymal Sperm Aspiration) Obstructiveazoospermia 90%+获取率

Varicocele Treatment

A varicocele — abnormal dilation of the pampiniform venous plexus in the scrotum — is found in 15–20% of all men but in 40% of men with primary infertility. Surgical repair (varicocelectomy) can:

  • Improve sperm count by 30–100%
  • Improve sperm motility
  • Reduce DNA fragmentation
  • Improve natural conception rates

Best candidates: Men with palpable varicocele, abnormal semen parameters, and a female partner with adequate ovarian reserve.

Lifestyle Interventions That Help

Supplements with Evidence

  • CoQ10 (Ubiquinol): 200–400 mg/day — improves mitochondrial function and sperm motility
  • Vitamin C (500 mg) + Vitamin E (400 IU): Reduces oxidative stress and improves sperm count
  • Zinc (15–30 mg): Essential for testosterone synthesis and spermatogenesis
  • L-Carnitine (1–3 g): Improves sperm motility and energy production
  • Folic Acid (5 mg, with zinc): Some evidence for improved sperm parameters
  • Omega-3 Fatty Acids: 1–2 g/day — associated with improved sperm membrane integrity

What to Avoid

  • Smoking — reduces sperm count, motility, and increases DNA damage
  • Excessive alcohol — even moderate consumption impairs spermatogenesis
  • Heat exposure — tight underwear, hot tubs, saunas, and prolonged sitting raise scrotal temperature
  • Anabolic steroids — suppress gonadotropins and cause azoospermia
  • Exposure to endocrine disruptors — pesticides, phthalates, BPA

Genetic Considerations

Men with Y-chromosome microdeletions (AZF region) will pass infertility to male offspring. ICSI using sperm from these men requires preimplantation genetic testing (PGT) and genetic counseling.

Men with balanced translocations or other chromosomal abnormalities have higher risks of miscarriage and birth defects — genetic counseling is essential before attempting IVF.

Need male fertility evaluation? Shenzhen Luohu Hospital offers comprehensive male fertility testing and ICSI treatment at a fraction of Western costs. Schedule a free consultation →