Testicular Sperm Extraction Techniques in Male Infertility

Testicular sperm extraction encompasses a spectrum of surgical and adjunctive methods designed to retrieve spermatozoa directly from testicular tissue in men with azoospermia. Conventional open biopsy or fine‐needle aspiration yields rates of 20–45% in non‐obstructive azoospermia (NOA), whereas microscopic techniques, notably microdissection testicular sperm extraction (micro-TESE), can raise retrieval rates to around 60%. Success hinges on testicular histology, underlying aetiology and adjunctive laboratory protocols. Advances in intraoperative imaging, refined enzymatic tissue processing and predictive biomarkers now inform patient selection and surgical strategy. In parallel, integration of hormonal and molecular indicators with machine-learning models offers personalised risk assessment. The practical aim is to maximise sperm recovery while minimising tissue damage and to guide couples towards realistic expectations and optimised assisted reproduction protocols.

Research from Nature Portfolio

Recent studies have established the ratio of anti-Müllerian hormone to total testosterone as a robust predictor of successful sperm retrieval in idiopathic NOA. Investigators analysed clinical and hormonal profiles in men undergoing micro-TESE, demonstrating that lower anti-Müllerian hormone levels and reduced hormone-to-testosterone ratios correlate with positive outcomes. Use of defined cut-offs for both markers achieved predictive accuracies exceeding 90%, and decision-curve analyses indicated substantial net clinical benefit for patient counselling and surgical decision-making. This approach has the potential to spare a significant proportion of patients from unnecessary invasive procedures and to streamline resource allocation in fertility centres.

Testicular Sperm Extraction Techniques in Male Infertility publication trend

The graph below shows the total number of articles in testicular sperm extraction techniques in male infertility across all publications each year (not limited to Nature Index journals).

Technical terms

Testicular sperm extraction (TESE): Surgical retrieval of sperm from testicular tissue in azoospermic men.

Microdissection TESE (micro-TESE): Microsurgical technique using optical magnification to identify seminiferous tubules with active spermatogenesis, increasing sperm yield and preserving tissue.

Non-obstructive azoospermia (NOA): Absence of sperm in ejaculate due to impaired spermatogenesis rather than tract obstruction.

Anti-Müllerian hormone (AMH): Hormone produced by Sertoli cells; its concentration reflects seminiferous tubule function and is used as a biomarker for retrieval success.

Intracytoplasmic sperm injection (ICSI): Assisted reproduction technique in which a single sperm is injected directly into an oocyte following sperm retrieval.

References

1. Non-invasive ultrasound localization microscopy (ULM) in azoospermia: connecting testicular microcirculation to spermatogenic functions. Theranostics (2024).
2. Enzymatic tissue processing after testicular biopsy in non-obstructive azoospermia enhances sperm retrieval. Human Reproduction Open (2023).
3. A Machine Learning Approach for the Prediction of Testicular Sperm Extraction in Nonobstructive Azoospermia: Algorithm Development and Validation Study. Journal of Medical Internet Research (2023).
4. Anti-Mullerian Hormone-to-Testosterone Ratio is Predictive of Positive Sperm Retrieval in Men with Idiopathic Non-Obstructive Azoospermia. Scientific Reports (2017).
5. Clinical Comparison of Conventional Testicular Sperm Extraction and Microdissection Techniques for Non-Obstructive Azoospermia. Journal of Clinical Medicine Research (2011).