Sperm Retrieval — Procedure Guide, Recovery & Risks | MyMedicPlus

Sperm retrieval refers to a group of surgical procedures used to obtain viable sperm directly from the testis or epididymis in men with azoospermia (no sperm in ejaculate) or severe oligospermia. The retrieved sperm are used for intracytoplasmic sperm injection (ICSI) as part of IVF treatment. Main techniques include TESA (testicular sperm aspiration), PESA (percutaneous epididymal sperm aspiration), TESE (testicular sperm extraction), and micro-TESE (microscopic testicular sperm extraction).

Four principal sperm retrieval techniques are used, selected based on the underlying cause of azoospermia: PESA (percutaneous epididymal sperm aspiration) — fine needle aspiration from the epididymis under local anaesthesia; TESA (testicular sperm aspiration) — needle aspiration of testicular tissue under local anaesthesia; TESE (testicular sperm extraction) — open surgical biopsy of testicular tissue under general or local anaesthesia; and micro-TESE (microsurgical TESE) — open surgery under 15–25× operating microscope magnification to selectively identify and harvest sperm-containing tubules — the gold standard for non-obstructive azoospermia. All techniques require immediate laboratory examination of the retrieved material by an embryologist.

Sperm retrieval procedures are performed in coordination with an IVF/ICSI cycle at a fertility centre. Retrieved sperm may be used fresh on the day of egg collection or cryopreserved in multiple aliquots for future cycles, avoiding the need for repeated surgical procedures. The choice of technique depends on the underlying aetiology, patient anatomy, surgeon experience, and laboratory capability.

Sperm retrieval is indicated for men with obstructive azoospermia (sperm production is normal but blocked) — such as after vasectomy, congenital absence of vas deferens, or epididymal scarring — and non-obstructive azoospermia where some testicular areas still produce sperm despite impaired overall production. It is also used for men with retrograde ejaculation, spinal cord injury, or inability to ejaculate.

Pre-procedure workup is essential: serum FSH (elevated indicates primary testicular failure), serum testosterone, LH, prolactin, and testicular volume by ultrasound. Genetic testing is mandatory: karyotype to detect Klinefelter syndrome (47,XXY), and Y-chromosome microdeletion analysis to detect AZFa, AZFb, or AZFc deletions. Complete AZFa or AZFb deletions are associated with Sertoli-cell-only or early maturation arrest — TESE is futile in these cases. AZFc deletions (the most common) retain a 50–70% chance of sperm retrieval by micro-TESE. Cystic fibrosis mutation screening is performed for all men with CBAVD before ICSI to counsel on offspring risk of CF.

PESA and TESA are performed under local anaesthesia with a fine needle aspirating fluid from the epididymis or testis. A laboratory embryologist immediately inspects the sample for sperm under a microscope. If no sperm are found, TESE involves making small testicular incisions to retrieve multiple tissue samples. Micro-TESE uses an operating microscope to identify and selectively extract dilated seminiferous tubules (more likely to contain sperm) minimising tissue removal.

Micro-TESE is coordinated with the female partner's IVF stimulation cycle to allow fresh sperm to be used for ICSI on the day of egg collection. Alternatively, retrieved sperm are cryopreserved in multiple aliquots for use in future ICSI cycles, avoiding the need for repeated surgical procedures. The embryology team examines retrieved material under phase-contrast microscopy, assigning a sperm score (0 — no sperm; 1 — rare non-motile sperm; 2 — motile sperm found) in real time to guide the surgeon's decision to continue or conclude the procedure.

For PESA, a fine 23-gauge butterfly needle attached to a 20 mL syringe is inserted into the head of the epididymis under local anaesthesia. Gentle aspiration retrieves epididymal fluid which is immediately examined by the embryologist. TESA uses a fine core biopsy needle or aspiration needle to retrieve 1–2 mm cores of testicular tissue from multiple sites.

PESA and TESA require only 2–3 days of recovery with mild scrotal discomfort managed by scrotal support and pain relief. Micro-TESE requires general anaesthesia and 3–5 days of discomfort. Strenuous activity and sexual intercourse are avoided for 1–2 weeks. Retrieved sperm can be used fresh (coordinated with the female partner's egg retrieval) or cryopreserved for future IVF cycles.

All sperm retrieval procedures are performed as day surgery. PESA and TESA require 2–3 days of scrotal support and analgesics before return to normal activities. Micro-TESE requires 5–7 days recovery with moderate scrotal discomfort. Return to work: 2–3 days for office-based employment after PESA/TESA; 5–7 days after micro-TESE. Strenuous exercise (running, cycling, gym) avoided for 2 weeks. Post-micro-TESE testosterone check at 3–6 months confirms preservation of endocrine function.

Risks of sperm retrieval procedures include haematoma (scrotal bruising), infection (rare), transient pain, and a small reduction in testosterone production if large testicular tissue volumes are removed in micro-TESE. Sperm may not be found despite the procedure (zero sperm yield) in approximately 40–60% of non-obstructive azoospermia cases — genetic testing before the procedure helps predict success.

Micro-TESE, as the most invasive technique, carries the highest risk of complications. Testicular haematoma occurs in 2–5%, usually resolving spontaneously over 2–3 weeks. Infection of wound or epididymis occurs in less than 1%. Post-operative testosterone deficiency requiring testosterone replacement therapy occurs in approximately 5–10% at 6–12 months, more commonly in patients with pre-existing borderline testosterone levels. Testicular atrophy from devascularisation of significant testicular tissue may occur with extensive biopsies. The procedure carries a failed retrieval rate of 40–60% in NOA — the most challenging aspect of counselling couples before surgery.

Sperm retrieval success rates vary by diagnosis. Obstructive azoospermia (post-vasectomy, CBAVD) has sperm retrieval rates of 90–100% with PESA or TESA. Non-obstructive azoospermia (testicular failure) has sperm retrieval rates of 40–60% with micro-TESE. IVF-ICSI using surgically retrieved sperm achieves clinical pregnancy rates of 30–50% per cycle in appropriately selected couples.

For obstructive azoospermia (vasectomy, CBAVD), PESA or TESA achieve sperm retrieval in 90–100% of cases, making biological parenthood achievable for virtually all couples where the female has normal ovarian function. For non-obstructive azoospermia (NOA), micro-TESE achieves sperm retrieval in 40–60% of cases overall — a result unachievable without microsurgical magnification. When sperm are retrieved and used with ICSI, cumulative clinical pregnancy rates of 40–50% per transfer provide realistic expectations. Cryopreservation of retrieved sperm allows multiple ICSI attempts from a single surgical procedure, maximising the value of the intervention for the couple.