What is Azoospermia?
💡 Azoospermia = no sperm in ejaculate. Types: obstructive (OA — blockage, e.g. vasectomy, congenital absence of vas deferens) — sperm retrievable by PESA/TESE in >90%; non-obstructive (NOA — testicular failure) — sperm retrievable by micro-TESE in 40–60%. All retrieved sperm used for ICSI. Workup: FSH, LH, testosterone, karyotype, Y-microdeletion.
Azoospermia is the complete absence of sperm in the ejaculate. It affects approximately 1% of all men and 10–15% of infertile men. Azoospermia is classified as obstructive (OA — sperm is produced but cannot exit due to a blockage) or non-obstructive (NOA — the testes produce little or no sperm). The distinction determines prognosis and treatment pathway, as sperm retrieval success rates differ dramatically between the two types.
🇮🇳 India Context: Azoospermia is widely assessed and treated across major Indian fertility centres including Chennai, Mumbai, Bangalore, Delhi, and Hyderabad.
What are the key characteristics of Azoospermia?
- Confirmation: azoospermia must be confirmed on ≥2 semen analyses with centrifugation of the complete sample (pellet examined under high magnification) — rare sperm missed on standard analysis
- Obstructive azoospermia (OA): normal testicular function (normal FSH, normal testicular volume); blockage in epididymis, vas deferens, or ejaculatory ducts; causes: vasectomy, CBAVD (congenital bilateral absence of vas deferens — CFTR mutation), epididymitis, previous hernia surgery
- Non-obstructive azoospermia (NOA): testicular failure; elevated FSH (usually >10 IU/L); small/soft testes; causes: Klinefelter syndrome (47,XXY), Y-chromosome microdeletion (AZFa/AZFb/AZFc), cryptorchidism, post-chemotherapy/radiotherapy, idiopathic
- Y-chromosome microdeletion: AZFc deletion — 50–70% sperm retrieval by TESE possible; AZFa deletion — no sperm retrievable (absolute contraindication to TESE); AZFb deletion — no sperm retrievable; genetic testing mandatory in NOA before TESE
- Klinefelter syndrome (47,XXY): most common chromosomal cause of NOA; micro-TESE retrieves sperm in 40–60%; ICSI results in normal-chromosomed offspring in most cases
- CBAVD (congenital bilateral absence of vas deferens): obstructive; associated with CFTR mutations (cystic fibrosis carrier status); partner must be tested for CFTR mutations before proceeding with ICSI to assess CF risk in offspring
- Sperm retrieval procedures — OA: PESA (percutaneous epididymal sperm aspiration) — needle aspiration; MESA (microsurgical epididymal sperm aspiration) — open microsurgery; TESE (testicular sperm extraction) — biopsy; >90% success rate
- Sperm retrieval — NOA: micro-TESE (microsurgical TESE) — operating microscope used to identify tubules with active spermatogenesis; 40–60% overall retrieval rate; frozen for use in ICSI
How does Azoospermia work?
Why does Azoospermia matter in fertility?
Azoospermia does not mean a man cannot father biological children — the majority of azoospermic men have viable treatment options. For OA, sperm retrieval success exceeds 90% and ICSI outcomes are excellent. For NOA, micro-TESE by an experienced andrologist retrieves sperm in 40–60% of cases, with subsequent ICSI live birth rates similar to other male factor patients. The critical management principle: never counsel an azoospermic man as infertile without: (a) confirming the diagnosis with centrifugation, (b) classifying OA vs NOA with hormones, (c) performing karyotype + Y-microdeletion in NOA before any sperm retrieval attempt.
What are related terms to Azoospermia?
Semen Analysis
Semen Analysis is the main test for evaluating male fertility. A semen sample is…
ICSI (Intracytoplasmic Sperm Injection)
ICSI is an advanced fertility technique. A single healthy sperm is injected dire…
Karyotyping
Karyotyping is a genetic test. A blood sample is taken and the chromosomes are s…
Varicocele
Varicocele is an enlargement of the veins within the scrotum — similar to varico…
FAQs about Azoospermia
Can azoospermia be cured?
Obstructive azoospermia is often treatable — through vasectomy reversal or surgical sperm retrieval with ICSI. Non-obstructive azoospermia cannot be "cured" but sperm can be retrieved surgically in 30–60% of cases for use with ICSI.
What is the difference between obstructive and non-obstructive azoospermia?
Obstructive azoospermia: normal sperm production, blocked delivery (vasectomy, absent vas deferens). Non-obstructive: impaired or absent sperm production (genetic, hormonal, testicular failure). Treatment and prognosis differ significantly.
How is azoospermia diagnosed?
Azoospermia is confirmed by two semen analyses showing zero sperm after centrifugation. Further evaluation includes FSH, LH, testosterone, testicular ultrasound, and genetic testing (karyotype, Y microdeletion).
What is micro-TESE and when is it used?
Micro-TESE (microsurgical testicular sperm extraction) is used for non-obstructive azoospermia. Under an operating microscope, the testis is examined for areas of active spermatogenesis. Success rate: 30–60%, depending on the underlying cause.
Can a man with azoospermia father a child?
Yes. Obstructive azoospermia has 80–100% sperm retrieval rates. Non-obstructive azoospermia achieves 30–60% with micro-TESE. Retrieved sperm is used with ICSI, enabling biological fatherhood in most obstructive and many non-obstructive cases.
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