Male Fertility: The Complete Guide
Male factor contributes to approximately 40–50% of all infertility — yet it remains dramatically under-investigated. Many couples spend months focused on the female partner while the male factor goes unexamined. A semen analysis takes 30 minutes and costs ₹500–₹1,500. It identifies the cause in 40–50% of infertile couples.
Understanding Semen Analysis: WHO 2021 Reference Values
The WHO 2021 manual updated reference values based on data from fertile men who fathered children within 12 months. These represent the 5th percentile of fertile men — values below these thresholds are associated with reduced fertility but do not define infertility.
| Parameter | Lower Reference Limit | |
|---|---|---|
| Volume | ≥1.4 mL | Hypospermia |
| Concentration | ≥16 million/mL | Oligospermia |
| Total count | ≥39 million | — |
| Progressive motility | ≥30% | Asthenospermia |
| Total motility | ≥42% | — |
| Normal morphology (Kruger) | ≥4% | Teratospermia |
| Vitality | ≥54% live | Necrospermia |
| No sperm | — | Azoospermia |
The most clinically useful number — Total Motile Sperm Count (TMSC):
| TMSC | Implication | Recommended Path |
|---|---|---|
| >20 million | Normal | Natural conception likely |
| 10–20 million | Mildly reduced | Try naturally; IUI may help |
| 5–10 million | Moderately reduced | IUI or IVF+ICSI |
| <5 million | Severely reduced | IVF with ICSI |
| 0 | Azoospermia | Surgical retrieval or donor |
Causes of Male Infertility
Varicocele — most common correctable cause Dilated scrotal veins present in 35% of infertile men. Elevated scrotal temperature from pooled blood impairs spermatogenesis through oxidative stress. Clinical (palpable) varicoceles with abnormal semen → microsurgical varicocelectomy improves parameters in 60–70% of cases (ASRM Grade A recommendation).
Idiopathic oligospermia (~30% of male factor) Low sperm count with no identified cause. Associated with elevated oxidative stress, lifestyle factors, possible subclinical varicocele.
Genetic causes:
- Klinefelter syndrome (47,XXY): 1 in 650 men; causes azoospermia in most cases; extra X chromosome disrupts testicular development
- Y-chromosome microdeletions (AZFa, AZFb, AZFc): 10–15% of severe oligospermia/azoospermia — genetic counselling essential before sperm retrieval
- CFTR mutations: congenital bilateral absence of vas deferens (CBAVD) — partner must be tested for carrier status (cystic fibrosis risk)
Hypogonadotropic hypogonadism (HH) — highly treatable The pituitary fails to produce adequate FSH and LH → testosterone and sperm production absent. Causes: Kallmann syndrome, pituitary adenoma, prior anabolic steroid use. Treatment: FSH + hCG injections → sperm production restores in 70–80% of patients within 6–18 months (EAU 2023 Grade A).
Lifestyle factors (ASRM 2022):
- Anabolic steroids / testosterone: completely suppresses spermatogenesis within 2–3 months; recovery 6–24 months after stopping
- Smoking: reduces count 15–20%, motility 13–17%, increases DNA fragmentation 30–40%
- Cannabis: reduces concentration 15–30%, increases morphological defects
- Heat (laptops, hot baths, tight underwear): raises scrotal temperature above the 33–34°C required for spermatogenesis
- Obesity: reduces testosterone (aromatase in fat tissue converts testosterone to estradiol), reduces count
Obstructive azoospermia Sperm produced but physically blocked: prior vasectomy (most common cause), epididymal obstruction from prior infection, CBAVD. Sperm retrieval success rate: >90% with PESA/MESA. Retrieved sperm used for ICSI.
Non-obstructive azoospermia (NOA) Impaired production itself. Causes: Klinefelter syndrome, Y-chromosome microdeletions, maturation arrest, Sertoli-cell-only syndrome, chemotherapy/radiotherapy damage. Micro-TESE (microsurgical testicular sperm extraction) retrieval rate: 40–60% depending on cause.
Sperm DNA Fragmentation: The Hidden Factor
Standard semen analysis does not measure DNA integrity. Sperm DNA Fragmentation Index (DFI) measures the proportion of sperm with damaged DNA.
Per ASRM 2022 and EAU 2023:
| DFI | Clinical Meaning |
|---|---|
| <15% | Normal |
| 15–25% | Borderline — may impact embryo quality |
| >25% | Elevated — impaired embryo development, higher miscarriage, failed IVF |
Test when: Two or more miscarriages; IVF failed despite good embryo quality; male partner over 45.
Treatment for high DFI:
- 3-month antioxidant protocol: CoQ10 400mg + Vitamin C 1g + Vitamin E 400IU + selenium 200mcg
- Quit smoking — highest single-impact change for DFI reduction
- Varicocele repair if present
- TESE + ICSI: testicular sperm has 3–4× lower DFI than ejaculated sperm — using testicular sperm bypasses epididymal oxidative damage
Evidence-Based Treatment by Diagnosis
Lifestyle-related oligospermia: 3-month optimisation protocol (ASRM 2022): quit smoking; switch to loose cotton underwear; remove laptops from lap; no hot baths/saunas; antioxidant protocol. Retest at month 4. Meaningful improvement in 40–60% of men.
Varicocele (clinical grade 2–3, abnormal semen): Microsurgical subinguinal varicocelectomy — ASRM/EAU 2023 Grade A recommendation. Improves TMSC in 60–70% within 3–6 months post-surgery. Meta-analyses show significant improvement in spontaneous pregnancy rates vs untreated.
Hypogonadotropic hypogonadism: FSH (75 IU three times/week) + hCG (1500–2000 IU twice/week) injections. 70–80% achieve sperm production within 6–18 months. Highly treatable — do not go directly to ICSI before hormonal treatment.
Antioxidant protocol for idiopathic/DFI: Most effective combination per systematic review (Majzoub & Agarwal 2018): CoQ10 200–400mg (ubiquinol form) + Vitamin C 500mg–1g + Vitamin E 400IU + zinc 66mg + selenium 100–200mcg + L-carnitine 2g. Minimum 3 months — spermatogenesis takes 74 days.
Obstructive azoospermia: PESA (percutaneous epididymal sperm aspiration) or TESE. >90% retrieval rate. Live birth rates with ICSI comparable to non-azoospermic couples of the same age.
Non-obstructive azoospermia: Micro-TESE using operating microscope at 25–40× magnification. Sperm retrieval 40–60% depending on cause. Mandatory genetic testing before micro-TESE: karyotype + Y-chromosome microdeletion analysis (ASRM/EAU 2023). AZFa/AZFb deletions predict <5% retrieval — counsel against micro-TESE for these men.
When Is ICSI Needed?
Per ASRM 2023 and ESHRE 2023:
| Indication | Level of Evidence |
|---|---|
| Severe oligospermia (TMSC <5M) | Grade A — mandatory |
| Severe asthenospermia (<10% progressive motility) | Grade A |
| Surgically retrieved sperm | Grade A — always |
| Previous conventional IVF fertilisation failure | Grade A |
| Severe teratospermia (<2% normal forms) | Grade B |
| High sperm DNA fragmentation (DFI >25%) | Grade B |
| PGT-A or PGT-M cycles | Grade B (contamination risk) |
Not recommended routinely for normal semen parameters (ASRM/ESHRE 2023).
Key Investigations
All infertile men: Semen analysis ×2 (4–6 weeks apart); FSH + LH + testosterone + prolactin if count is low; physical examination for varicocele
Severe oligospermia (<5M/mL) or azoospermia: Karyotype; Y-chromosome microdeletion analysis; CFTR testing if CBAVD suspected; scrotal ultrasound
Recurrent miscarriage or failed IVF: Sperm DNA fragmentation index
Reference: ASRM Practice Committee — Male Infertility Best Practices, 2022. EAU Guidelines — Male Infertility, 2023. WHO Laboratory Manual for Semen Analysis, 6th edition, 2021. ESHRE Good Practice Recommendations on ICSI, 2023. ACOG Committee Opinion No. 607, reaffirmed 2023.
Frequently Asked Questions
What is a normal sperm count?▾
Per WHO 2021: ≥16 million sperm per mL (≥39 million total per ejaculate) is the lower reference limit. For fertility assessment, Total Motile Sperm Count (TMSC) is more useful: above 20 million is normal, 5–20 million is mildly reduced, below 5 million is severe male factor requiring IVF with ICSI.
What causes low sperm count?▾
The most common causes are: varicocele (35% of infertile men — most common correctable cause), idiopathic (~30%, no identified cause), genetic disorders (Klinefelter syndrome, Y-chromosome microdeletions), hypogonadotropic hypogonadism (very treatable with FSH/hCG injections), and lifestyle factors (smoking reduces count 15–20%; anabolic steroids completely suppress production; heat exposure from laptops or hot baths).
Can low sperm count be treated?▾
Yes — many causes are treatable. Varicocele repair improves parameters in 60–70% of men (ASRM Grade A). Hormonal treatment (FSH + hCG) for hypogonadotropic hypogonadism restores sperm in 70–80% within 6–18 months. A 3-month antioxidant and lifestyle protocol improves lifestyle-related oligospermia. Even for azoospermia, PESA gives >90% retrieval for obstructive cases; micro-TESE gives 40–60% for non-obstructive.
When do you need IVF for male infertility?▾
IVF with ICSI is recommended (ASRM 2023) when TMSC falls below 5 million after preparation, sperm are surgically retrieved, previous IVF produced no fertilisation, or sperm DNA fragmentation is very high (>25%). For mild-to-moderate male factor (TMSC 5–20 million), 3–6 IUI cycles are a reasonable first step before IVF.