Receiving a semen analysis result showing no sperm — a condition called azoospermia — can feel like a door slamming shut. For many men, it is the moment a fertility problem that existed quietly in the background suddenly becomes impossible to ignore. But azoospermia is not the end of the road. For a significant proportion of men, sperm can be retrieved surgically, and biological fatherhood remains a realistic goal.
This guide explains what azoospermia means, why it happens, and what your options are.
What Is Azoospermia?
Azoospermia is the complete absence of sperm in ejaculated semen. It affects approximately 1% of all men and is found in around 10–15% of men who present with infertility. It is divided into two distinct types, each with a different cause and a different treatment approach.
Obstructive azoospermia (OA) occurs when sperm are being produced normally in the testes but cannot reach the ejaculate because of a blockage somewhere in the reproductive tract. Common causes include:
- Previous vasectomy
- Congenital absence of the vas deferens (often linked to CFTR gene mutations)
- Prior infection causing epididymal scarring
- Previous surgery causing inadvertent damage to the reproductive tract
Non-obstructive azoospermia (NOA) occurs when sperm production itself is impaired. The testes are producing little or no sperm. Causes include:
- Genetic conditions (Klinefelter syndrome, Y chromosome microdeletions)
- Previous chemotherapy or radiotherapy
- Hormonal disorders affecting the pituitary-testicular axis
- Varicocele causing testicular damage
- Cryptorchidism (undescended testes) in childhood
- Idiopathic (no identifiable cause — the most common category)
The distinction between OA and NOA matters enormously, because the treatment pathways are different and the probability of successful sperm retrieval varies substantially.
How Is Azoospermia Diagnosed?
A single semen analysis showing no sperm is not sufficient for a diagnosis. The result must be confirmed on at least two samples, and a full andrological assessment is essential before any treatment decisions are made.
At London Andrology, our assessment for azoospermia includes:
- Repeated semen analysis with centrifugation (to identify any rare sperm)
- Hormonal blood tests (FSH, LH, testosterone, prolactin, inhibin B)
- Scrotal ultrasound
- Genetic testing (karyotype, Y chromosome microdeletion screen, CFTR mutation analysis where relevant)
- Physical examination by a subspecialist andrologist
This workup allows us to classify your azoospermia accurately and counsel you on the most appropriate treatment.
Treatment Options for Azoospermia
For obstructive azoospermia, the primary options are surgical sperm retrieval for use in IVF/ICSI, or surgical reconstruction of the obstructed tract. Where vasectomy reversal is the cause, microsurgical reversal offers the possibility of natural conception and is often the most cost-effective first-line approach for suitable candidates.
For other forms of OA, sperm retrieval using PESA (percutaneous epididymal sperm aspiration) or TESE (testicular sperm extraction) is typically highly successful — retrieval rates exceed 90% in most series.
For non-obstructive azoospermia, the situation is more nuanced. Standard TESE has relatively low retrieval rates in NOA. The gold standard is microTESE — microscopic testicular sperm extraction — in which an operating microscope is used to identify and target areas of the testis most likely to contain sperm. In experienced hands, microTESE achieves sperm retrieval in approximately 40–60% of men with NOA — meaning that even in the most challenging cases, a meaningful proportion of men can have biological children.
What Determines the Chances of Success?
Several factors influence the likelihood of successful sperm retrieval in NOA:
- The underlying cause (genetic causes generally carry lower retrieval rates)
- Testicular volume and FSH level (though neither is perfectly predictive)
- Surgeon experience with microTESE
- The IVF laboratory's capacity to identify and use retrieved sperm effectively
At London Andrology, Professor Minhas and Professor Yap are among the UK's highest-volume microTESE surgeons. Their results reflect the international benchmark for this procedure.
What If No Sperm Are Found?
When surgical retrieval is unsuccessful, donor sperm is the remaining option for couples wishing to pursue parenthood. We will always discuss this possibility openly before any surgical procedure, so that couples can make an informed decision about whether to proceed.
We also counsel patients about the emotional impact of a failed retrieval and can direct patients to specialist psychological support where needed.
Next Steps
If you have received a diagnosis of azoospermia — or if your semen analysis has shown no sperm and you have not yet had a subspecialist evaluation — we would encourage you to seek an expert opinion before drawing any conclusions about your fertility.
To book a consultation with Professor Minhas or Professor Yap, contact London Andrology today.
