Azoospermia
Azoospermia is the complete absence of sperm in the semen. At least two separate semen analyses must confirm it. The laboratory spins each sample down (centrifugation) to look for any sperm.1 Azoospermia affects about 1% of all men.2 It also affects 10 to 15 percent of men with infertility.3
Azoospermia occurs in two very different forms. Obstructive azoospermia (OA) involves a blockage. Non-obstructive azoospermia (NOA) involves no blockage. The first clinical question is which form is present. The causes, the correctable problems, and the restorative options differ greatly between the two.
In obstructive azoospermia, the testes still produce sperm. The ducts do not carry the sperm into the semen. The reason is a blockage or a duct that never formed. Common causes include a past vasectomy, a blocked epididymis, and a blocked ejaculatory duct.4
After a vasectomy, a microsurgical vasectomy reversal can restore sperm to the semen. For many couples, it restores the possibility of natural conception. Several factors affect success, such as the time since the vasectomy.5
Some men are born without both vas deferens, the ducts that carry sperm from the testes. This condition is congenital bilateral absence of the vas deferens (CBAVD). It is also an obstructive form. The duct never formed, so microsurgery cannot rebuild it.6
Sperm production is normal in these men. Sperm can therefore be retrieved directly from the epididymis or the testis. The workup includes testing for CFTR gene variants and genetic counseling. It also considers assisted conception. In CBAVD, that means sperm retrieval and ICSI rather than repair.78
In non-obstructive azoospermia, the testes do not produce sperm effectively. Causes include testicular failure, chromosome abnormalities, and low hormone levels. Some cases have a correctable cause, such as a varicocele, an enlarged group of veins in the scrotum.9
Most surgical and empirical treatments offered for NOA still lack support from strong studies. Empirical treatments are those given without a confirmed target. The European Association of Urology (EAU) 2021 guidelines state that the evidence is too limited to support their wide use in routine care.9
Varicocele repair is the exception. A pooled analysis studied men with NOA and a varicocele that could be felt on examination. After repair (varicocelectomy), sperm returned to the semen in 43.9% of these men. Reviewers rated the evidence as low to moderate quality. They concluded that these men benefit from repair.10 Clinicians who work within a restorative framework check for varicocele first. When one is present, they correct it before attempting surgical sperm retrieval.11
What does azoospermia mean for a couple trying to conceive? It raises the central question of restorative evaluation: can the cause be corrected? A minority of NOA cases have a clear, correctable cause. One example is hypogonadotropic hormonal deficiency, a shortage of the brain hormones that drive the testes. This deficiency can respond to treatment and restart sperm production.12
Many other cases arise from problems in the testes or in the genes. In these cases, sperm production cannot be restored. An accurate diagnosis distinguishes the two groups. Obstructive cases with normal sperm production have clearer surgical paths.
The value of the diagnosis is direction. It tells the couple whether the path runs through a correctable cause. Otherwise, it tells them that the workup has defined their realistic options.
Clinicians who evaluate azoospermia within a restorative framework look for correctable causes first. Surgical sperm retrieval (TESE or microTESE) can find small areas of sperm production in some NOA cases.13 Sperm retrieved this way for ICSI serves the goal of a pregnancy. It does not correct the hormonal, structural, or genetic condition behind the azoospermia. RRM Academy regards it as a procedural workaround, not a treatment of the cause.
Both partners undergo evaluation at the same time. NaProTechnology treats the couple as the unit of evaluation. It assesses female and male factors together, within the same diagnostic and treatment framework.14 and restorative andrology.
Cited in this entry
- Schlegel PN, Sigman M, Collura B, et al. Diagnosis and Treatment of Infertility in Men: AUA/ASRM Guideline Part I. J Urol. 2021;205(1):36-43. https://pubmed.ncbi.nlm.nih.gov/33295257/
- Wosnitzer MS, Goldstein M Obstructive azoospermia. The Urologic clinics of North America. 2014. https://pubmed.ncbi.nlm.nih.gov/24286769/
- Wosnitzer M, Goldstein M, Hardy MP Review of Azoospermia. Spermatogenesis. 2014. https://pubmed.ncbi.nlm.nih.gov/25105055/
- Schlegel PN Causes of azoospermia and their management. Reproduction, fertility, and development. 2004. https://pubmed.ncbi.nlm.nih.gov/15367371/
- Belker AM, Thomas AJ Jr, Fuchs EF, Konnak JW, Sharlip ID. Results of 1,469 microsurgical vasectomy reversals by the Vasovasostomy Study Group. J Urol. 1991;145(3):505-511. https://pubmed.ncbi.nlm.nih.gov/1997700/
- Anguiano A, Oates RD, Amos JA, Dean M, Gerrard B, Stewart C et al. Congenital bilateral absence of the vas deferens. A primarily genital form of cystic fibrosis. JAMA. 1992. https://pubmed.ncbi.nlm.nih.gov/1545465/
- Chillón M, Casals T, Mercier B, Bassas L, Lissens W, Silber S et al. Mutations in the cystic fibrosis gene in patients with congenital absence of the vas deferens. The New England journal of medicine. 1995. https://pubmed.ncbi.nlm.nih.gov/7739684/
- Persily JB, Vijay V, Najari BB How do we counsel men with obstructive azoospermia due to CF mutations?-a review of treatment options and outcomes. Translational andrology and urology. 2021. https://pubmed.ncbi.nlm.nih.gov/33850781/
- Minhas S, Bettocchi C, Boeri L, Capogrosso P, Carvalho J, Cilesiz NC et al. European Association of Urology Guidelines on Male Sexual and Reproductive Health: 2021 Update on Male Infertility. European urology. 2021. https://pubmed.ncbi.nlm.nih.gov/34511305/
- Esteves SC, Miyaoka R, Roque M, Agarwal A Outcome of varicocele repair in men with nonobstructive azoospermia: systematic review and meta-analysis. Asian journal of andrology. 2016. https://pubmed.ncbi.nlm.nih.gov/26680033/
- Clinical Outcomes of Varicocele Repair in Infertile Men: A Review. https://pmc.ncbi.nlm.nih.gov/articles/PMC4999483/
- Bouloux P, Warne DW, Loumaye E, FSH Study Group in Men's Infertility Efficacy and safety of recombinant human follicle-stimulating hormone in men with isolated hypogonadotropic hypogonadism. Fertility and sterility. 2002. https://pubmed.ncbi.nlm.nih.gov/11821082/
- Schlegel PN Testicular sperm extraction: microdissection improves sperm yield with minimal tissue excision. Human reproduction (Oxford, England). 1999. https://pubmed.ncbi.nlm.nih.gov/10374109/
- Stanford JB, Parnell T, Kantor K, Reeder MR, Najmabadi S, Johnson K et al. International Natural Procreative Technology Evaluation and Surveillance of Treatment for Subfertility (iNEST): enrollment and methods. Human reproduction open. 2022. https://pubmed.ncbi.nlm.nih.gov/35974874/
Authoritative references
How other clinical authorities define this term. RRM Academy curates these verbatim or under fair use so the medical consensus is visible alongside our RRM-contextualized definition above.
- MeSH D053713
A condition of having no sperm present in the ejaculate (SEMEN).
- NCI Thesaurus
Complete absence of spermatozoa in the semen.
- Wikipedia Azoospermia
Azoospermia is the medical condition of a man whose semen contains no sperm.
This content is for educational purposes only and does not constitute medical advice. Consult an RRM clinician or healthcare provider for guidance specific to your situation.
