Zero Sperm Count (Azoospermia): Treatment Options and Chances of Fatherhood

Azoospermia: no sperm in the ejaculate

Azoospermia means no sperm are found in the ejaculate. It affects a meaningful minority of men investigated for infertility, and it does not mean biological fatherhood is impossible.

First: confirm it

Before anything else, the sample should be centrifuged and the pellet examined thoroughly. Extended search of the centrifuged specimen has found at least rare sperm in up to 35% of men previously thought to be azoospermic. That is a substantial proportion, and it should happen before any surgical discussion.

Two different conditions

Obstructive azoospermia means sperm are being produced but cannot get out — a blockage. Typical findings are normal testicular volume, normal FSH, and sometimes low semen volume.

Non-obstructive azoospermia means production itself is impaired. Typical findings are smaller testes and raised FSH.

The AUA/ASRM guideline advises that azoospermic men should be evaluated clinically to distinguish the two, based initially on semen volume, physical examination and FSH — and that diagnostic testicular biopsy should not routinely be performed to make this distinction.

Genetic testing comes before surgery

This is the step most often done in the wrong order.

Karyotype and Y-chromosome microdeletion analysis are recommended in azoospermia. The result changes what surgery is worth attempting:

Complete AZFa or AZFb deletion — sperm have not been retrieved by testicular sperm extraction in these men. The guideline states surgical intervention is not indicated. Testing first spares a futile operation.

AZFc deletion — sperm are retrieved in at least 50%.

Klinefelter syndrome (47,XXY) — rare foci of sperm production are found on microdissection TESE in at least 50 to 60%. This is not a barrier to retrieval.

Where obstruction is suspected, CFTR mutation testing including the 5T allele is recommended, particularly with absent vas deferens. If a CFTR mutation is found, the female partner should be offered genetic testing too.

Retrieval

For non-obstructive azoospermia, microdissection TESE is recommended. Meta-analysis found it successful 1.5 times more often than conventional TESE, and TESE twice as likely to succeed as testicular aspiration.

For obstructive azoospermia, sperm can be retrieved from the testis or epididymis.

Retrieved sperm are used with ICSI. Either fresh or cryopreserved sperm may be used.

On medical therapy before retrieval

Medications are sometimes offered to try to improve retrieval rates in non-obstructive azoospermia. The guideline is direct: for men with NOA, medical interventions such as SERMs, aromatase inhibitors and hCG have limited, low-quality data supporting any treatment benefit.

After cancer treatment

Men who remain azoospermic after gonadotoxic therapy should be informed that TESE is a treatment option — the guideline grades this a strong recommendation. Retrieval is typically deferred until at least two years after chemotherapy.