A testicular biopsy removes a small piece of testicular tissue so the seminiferous tubules can be examined, and in some situations sperm can be searched for and retrieved. Modern male-infertility practice does not use routine diagnostic biopsy simply to distinguish obstructive from non-obstructive azoospermia when history, examination, semen volume and hormones already provide the answer. Biopsy is most useful when the diagnosis remains genuinely uncertain, when tissue is being obtained therapeutically for sperm retrieval, or when a specific testicular pathology question needs tissue diagnosis.

What is a testicular biopsy?

The surgeon opens or punctures the testis to obtain tissue containing seminiferous tubules. A pathologist can describe patterns such as normal spermatogenesis, hypospermatogenesis, maturation arrest or Sertoli-cell-only syndrome. An embryologist can simultaneously search tissue for sperm if fertility treatment is planned.

Why routine diagnostic biopsy is usually avoided

ASRM guidance states that diagnostic testicular biopsy should not routinely be performed just to differentiate obstructive azoospermia from NOA. In many men, testis size, FSH, semen volume/pH and palpation of the vas/epididymis provide enough information. Avoiding unnecessary biopsy reduces bleeding, scarring and loss of testicular tissue.

When biopsy may still be useful

• Azoospermia with normal FSH and normal testicular volume but no clear evidence of obstruction or impaired production.
• Biopsy performed at the same time as sperm retrieval so tissue has both diagnostic and therapeutic value.
• Selected testicular lesions or microcalcification scenarios where pathology is required for another clinical reason.
• Previous conflicting investigations where histology will genuinely change management.

Biopsy versus TESE versus micro-TESE

Anaesthesia and recovery

A small diagnostic biopsy or TESE may be performed under local anaesthesia with sedation or under short general/regional anaesthesia depending on the procedure, patient and centre. Mild scrotal pain, swelling or bruising is common for a few days. Supportive underwear and temporary restriction of heavy exercise are usually advised.

Risks

• Scrotal haematoma or bleeding.
• Infection.
• Pain and swelling.
• Focal scar/fibrosis in testicular tissue.
• Temporary or, rarely, clinically significant effect on testosterone—risk rises with extensive tissue removal or already compromised testes.

What should the report include?

Histology should be correlated with the semen and surgical retrieval findings. A label such as “Sertoli-cell-only” from one small biopsy does not necessarily prove that every part of the testis is identical, because NOA can be patchy. This is one reason micro-TESE can sometimes retrieve sperm even after an earlier biopsy looked very poor.

Diagnostic biopsy versus sperm retrieval

A diagnostic testicular biopsy removes tissue mainly to describe sperm production under the microscope. A sperm-retrieval procedure removes tissue because the immediate goal is to find viable sperm for cryopreservation or ICSI. In modern male-infertility practice these goals should not be confused: if a man with non-obstructive azoospermia may need testicular sperm, doing a separate diagnostic biopsy first can expose him to two operations without necessarily improving the final decision.

How is a testicular biopsy performed?

After anaesthesia, a small scrotal opening is made and a limited piece of seminiferous-tubule tissue is sampled. The specimen may be sent for histopathology, embryology sperm search, or both depending on the purpose. When sperm retrieval is the goal in non-obstructive azoospermia, micro-TESE uses an operating microscope to search larger, more promising tubules rather than taking a blind diagnostic sample.

What can histology show?

Risks and recovery

Expected short-term effects include scrotal soreness, bruising and mild swelling. Less common risks are haematoma, infection, persistent pain and tissue loss. Men with small or poorly functioning testes need particular care because unnecessary tissue removal can further affect testicular function. Fever, rapidly increasing swelling or severe worsening pain after biopsy needs prompt review.

Why diagnostic testicular biopsy is used less often now

A standalone biopsy was historically used to distinguish obstruction from poor sperm production. Today, history, examination, semen characteristics, hormones and genetics often provide much of that information without removing testicular tissue. In non-obstructive azoospermia, a small biopsy can also miss focal sperm production because it samples only a tiny part of the testis.

If the clinical goal is to obtain sperm for IVF/ICSI, it is often more useful to plan a retrieval procedure rather than a biopsy done only for diagnosis. Men with obstructive azoospermia may need epididymal or testicular retrieval, while men with non-obstructive azoospermia are generally counselled about micro-TESE when retrieval is appropriate. Histology from a previous biopsy can still provide useful information, but it does not perfectly predict whether sperm will be found elsewhere in the testis.

Biopsy remains appropriate in selected situations, including specific diagnostic uncertainty or concern for testicular pathology. The indication should be clear before tissue is taken.

Because biopsy removes testicular tissue, the balance between diagnostic value and tissue preservation matters. Possible complications include bruising, bleeding, infection and local scarring; extensive or repeated procedures can also affect testicular function. This is another reason to avoid an invasive biopsy when it will not change management.

When tissue is obtained, the report may describe patterns such as hypospermatogenesis, maturation arrest or Sertoli-cell-only appearance. These terms help explain the sampled tissue but should not be presented as a perfect map of the entire testis. In non-obstructive azoospermia especially, sperm production can be patchy, so a negative small biopsy does not always mean that a carefully performed micro-TESE will also be negative.

What to bring for consultation

Bring these if available:

• Semen reports confirming azoospermia.
• FSH, LH and testosterone.
• Karyotype/Y-microdeletion tests.
• Previous biopsy pathology and slides/report if available.
• Prior sperm retrieval operative/embryology notes.
• Blood-thinner medicines and general medical history.

FAQs

Related reading

• Azoospermia: No Sperm in Semen
• Non-Obstructive Azoospermia
• Micro-TESE Surgery Explained
• TESA and PESA Explained
• High FSH in Male Infertility
• Urologist in Latur

References

• European Association of Urology. EAU Guidelines on Sexual and Reproductive Health: Male Infertility. 2026 https://uroweb.org/guidelines/sexual-and-reproductive-health/chapter/male-infertility
• American Urological Association/American Society for Reproductive Medicine. Diagnosis and Treatment of Infertility in Men: AUA/ASRM Guideline (2020; Amended 2024) https://www.auanet.org/documents/Guidelines/PDF/2024%20Guidelines/Male%20Infertility%20Unabridged%20Final.pdf