Azoospermia

What azoospermia means

Azoospermia means that no sperm at all can be found in the ejaculate after the sample has been spun down and examined carefully by a laboratory. It is a frightening diagnosis to be given, and it is frequently explained badly. It does not automatically mean that the testicles produce no sperm, and it does not automatically mean donor sperm is the only route to a family.

The single most important step is to establish which of two very different situations applies to you, because the treatment and the outlook differ completely.

Obstructive azoospermia

Here the testicles produce sperm normally, but the sperm cannot get out. The blockage may be anywhere along the route from the epididymis to the ejaculatory ducts. Causes include previous vasectomy, infection, hernia or scrotal surgery in childhood, and congenital absence of the vas deferens, which is closely associated with cystic fibrosis gene mutations.

Men with obstructive azoospermia usually have normal-sized testicles, a normal FSH level and normal testosterone. Sperm can almost always be obtained, either by relieving the blockage surgically so that natural conception becomes possible again, or by retrieving sperm directly for use in ICSI.

Non-obstructive azoospermia

Here the problem is production. The tubes are open, but the testicles are making very little sperm or none at all. Causes include genetic conditions such as Klinefelter syndrome and Y chromosome microdeletions, previous chemotherapy or radiotherapy, undescended testicles, testicular torsion, mumps orchitis, and in many men no identifiable cause at all.

This group typically has smaller, softer testicles, a raised FSH and sometimes low testosterone. Crucially, even when no sperm reach the ejaculate, small isolated areas of the testicle may still be producing sperm. Finding those areas is the purpose of microTESE.

How azoospermia is investigated

Assessment establishes which type you have and looks for a treatable or inheritable cause:

• Examination — testicular volume, the presence of the vas deferens on both sides, epididymal fullness and any varicocele
• Hormones — FSH, LH, testosterone and prolactin. FSH is the single most useful discriminator between obstruction and production failure
• Genetic testing — karyotype and Y chromosome microdeletion analysis; CFTR mutation testing where the vas is absent
• Ultrasound — scrotal, and transrectal where ejaculatory duct obstruction is suspected
• Repeat semen analysis with extended preparation, looking specifically for rare sperm

Where a genetic cause is identified, genetic counselling is arranged, because some conditions can be passed to a son conceived through ICSI. This needs discussing honestly and in advance.

Treatment options

For obstructive azoospermia, microsurgical reconstruction can restore sperm to the ejaculate and allow natural conception. Where reconstruction is not possible or not wanted, surgical sperm retrieval is straightforward and yields good-quality sperm.

For non-obstructive azoospermia, microTESE performed under an operating microscope is the technique with the highest chance of finding sperm and the lowest risk of damaging the remaining testicular tissue. Timing is coordinated with your partner's IVF cycle, or sperm can be frozen in advance. Where hormone abnormalities are present, a period of medical treatment before surgery is sometimes appropriate.

If no sperm are found, the options are donor sperm, adoption, or choosing not to pursue treatment further. That conversation should happen before surgery, not after it, so that you are prepared for every outcome.

Why specialist care matters here

Sperm retrieval in non-obstructive azoospermia is a genuinely specialist microsurgical procedure, and it is usually a one-chance operation — a poorly performed first attempt removes tissue and makes any subsequent attempt harder. I direct a tertiary referral andrology practice at Guy's Hospital, teach this surgery nationally and internationally, and receive referrals from other units for men in whom retrieval has already failed elsewhere.