Evaluation and semen analysis1,2
- Conduct a relevant reproductive history and focused clinical examination.
- Semen analysis must follow the WHO 6th edition standards.
Standardised collection (2–7 days abstinence)
Accurate volume measurement
Sperm concentration, motility, morphology and vitality assessment
Internal/external quality control
WHO 6th-edition reference values2
| Parameter |
Reference value (5th percentile, 95% CI) |
| Semen volume (mL) |
1.4 (1.3–1.5) |
| Sperm concentration (million/mL) |
16 (15–18) |
| Total sperm number (million/ejaculate) |
39 (35–40) |
| Total motility (PR + NP, %) |
42% (40–43) |
| Progressive motility (PR, %) |
30% (29–31) |
| Vitality (%) |
54% (50–56) |
| Normal morphology (%) |
4% (3.9–4.0) |
Indications for further evaluation1
- Endocrine evaluation is indicated only after two abnormal semen analyses.
- Scrotal ultrasound is recommended for obese men, those with prior scrotal surgery, or those who have a tight/small scrotum.
- Transrectal ultrasound is reserved for suspected ejaculatory duct obstruction.
Obstructive azoospermia1
- Suspect congenital bilateral absent vas deferens in men with non-palpable vas and test for CFTR mutations.
- Testicular biopsy should be performed in centres with sperm retrieval and cryopreservation capability.
- Microsurgical reconstruction (vasovasostomy / epididymovasostomy) is preferred in men with partners with good ovarian reserve.
- When ovarian reserve is limited, use sperm retrieval (MESA/TESE/PESA/TESA) adjunctively.
- For irreparable obstruction, sperm retrieval is preferred for ICSI/IVF.
Non-obstructive azoospermia1
- A comprehensive evaluation includes a detailed history, hormonal profile and genetic testing.
- AZFa/AZFb microdeletions contraindicate surgical sperm retrieval.
- Microdissection TESE is the most efficient sperm retrieval technique in NOA.
Hypogonadotropic hypogonadism1
- HH results from pituitary/hypothalamic dysfunction, causing impaired androgen and sperm production.
- Diagnosis: Confirm by low FSH, LH and testosterone; brain imaging is advised.
- Androgen replacement therapy is recommended when fertility is not desired; gonadotropins are required to induce spermatogenesis.
Infections1
- A 3–6 week course of antibiotics and anti-inflammatory agents may help with infections and related conditions.
- Antioxidants may aid ROS reduction following epididymal inflammation.
Genetic considerations1
- High LH/FSH levels in azoospermia warrant genetic testing.
- Sperm concentration <10 million/mL (especially <5 million/mL) requires genetic counselling and karyotyping/microdeletion testing.
- Men with Klinefelter syndrome have 22%–50% sperm retrieval success rate via micro-TESE.
Varicocele1
- Only a clinically palpable varicocele requires treatment.
- Microsurgical varicocelectomy is preferred.
Cancer and fertility1
- Fertility counselling and cryopreservation are mandatory.
- Assess and discuss hypogonadism risk and establish baseline hormones.
- Onco-TESE is an option for azoospermia with bilateral tumours.
Idiopathic infertility1
- Empirical therapy includes hormonal agents and antioxidants.
- Treat for 4–6 months before considering ART.
- Men with abnormal testosterone-to-oestradiol ratio may benefit from aromatase inhibitors.
Abbreviation
ART: Assisted reproductive technology; CFTR: Cystic fibrosis transmembrane conductance regulator; CI: Confidence interval; FSH: Follicle-stimulating hormone; HH: Hypogonadotropic hypogonadism; ICSI: Intracytoplasmic sperm injection; IVF: In vitro fertilisation; LH: Luteinising hormone; MESA: Microsurgical epididymal sperm aspiration; NOA: Non-obstructive azoospermia; NP: Non-progressive motility; PESA: Percutaneous epididymal sperm aspiration; PR: Progressive motility; ROS: Reactive oxygen species; TESE: Testicular sperm extraction; TESA: Testicular sperm aspiration; USI: Urological Society of India; WHO: World Health Organization
References
1. Priyadarshi S, Tanwar R, Malhotra V, et al. The Urological Society of India guidelines for the management of male infertility (Executive Summary). Indian J Urol. 2023;39(1):7–11.
Available from: https://journals.lww.com/indianjurol/fulltext/2023/39010/the_urological_society_of_india_guidelines_for_the.3.aspx
2. World Health Organization. Laboratory manual for the examination and processing of human semen — 6th Edition (2021).
Available from: https://iris.who.int/server/api/core/bitstreams/4038e736-37b3-4064-a39a-60475e0ccecc/content. Accessed on: 11 December 2025.