No sperm in the sample? What to know about obstructive or non-obstructive azoospermia, diagnostic errors and next-generation treatment

Hearing that a semen analysis showed no sperm can completely stop you in your tracks.

That’s what happened almost 10 years ago when TRB founder Eloise Edington and her husband got their results back. For them, the questions immediately began to skyrocket: Can azoospermia be misdiagnosed? How do you know if it’s obstructive vs. non-obstructive? Does this always mean surgery?

At the time, it was not easy to obtain clear and well-founded answers. The information seemed fragmented and it was far from easy to know what applied to their situation.

Fast forward to today, and these gaps in understanding are exactly what TRB exists to help fill. For this, we had the chance to sit down with one of the most experienced names in the field.

Based in New York, Dr. Pierre Schlegel East a global leader in male fertility and healthy living.

We sat down with him to discuss some of the most researched questions in the United States today, including obstructive and non-obstructive azoospermia, how they are diagnosed now, and what’s changing in the world of treatments and extractions.

What is azoospermia?

In simple terms, azoospermia is diagnosed when no sperm are visible in a semen sample after appropriate analysis.

“Azoospermia is a condition in which no sperm are present in the ejaculate, which can occur because sperm production is very, very low, so low that no sperm survives the journey out of the body. There may also be normal sperm production, with a blockage preventing sperm from exiting,” explains Dr. Schlegel.

Studies tell us that it affects approximately 1% of men overall and up to 10 to 15% of infertile men.

Obstructive or non-obstructive azoospermia

Obstructive

“Obstructive azoospermia is a condition in which sperm production is completely normal, so the ability to obtain sperm and use them, especially with in vitro fertilization, is excellent,” says Dr. Schlegel.

Here, sperm are produced but cannot reach the ejaculate due to a blockage. This may be due to missing ducts, a previous infection, or surgery. Azoospermia surgery is often very effective in these cases.

Non-obstructive

“Non-obstructive azoospermia is the case where there is overall sperm production very, very lowand it’s a much more difficult disease to treat because you usually only find very rare sperm,” says Dr. Schlegel.

This form involves impaired sperm production inside the testicle itself. It’s more complex, but not without options either.

Causes of non-obstructive azoospermia​

• Genetic factors – Klinefelter syndrome, Y chromosome variations
• Hormonal problems
• Testimonye – via infections, trauma, radiotherapy, chemo, varicoceles
• History of undescended testicles – cryptorchidism
• Environmental Toxins and Lifestyle Factors

“Men without sperm in the ejaculate due to low production are often born with this condition, or it can be caused by a very serious insult such as chemotherapy given for cancer or radiation therapy.” said Dr. Schlegel.

Causes of obstructive azoospermia

• Congenital causes
• Acquired causes – Infections, trauma, surgical complications

“In other cases, men may have a blockage that prevents sperm from coming out, either because they were born with a missing area of ​​the reproductive system. Essentially, the ducts or pathway for the sperm to pass through have not developed, or because they have an infection or have acquired a blockage in their tract,” says Dr. Schlegel.

Can azoospermia be misdiagnosed?

“Yes,” said Dr. Schlegel, and laboratory technique is often the reason.

“Azoospermia… depends very much on how the laboratory analyzes these samples… It is typical in a standard analysis to miss a very limited number of sperm in a standard evaluation.”

A Note on Expanded Sperm Research

“So a prolonged search for sperm is actually a more detailed analysis of the fluid that makes up semen to look for very rare sperm,” says Dr. Schlegel.

“You can miss sperm with a standard semen analysis… Extensive research looks at drop after drop after drop to find even very rare sperm in the ejaculate.”

This is important because the discovery of even a small number of sperm can change the therapeutic course.

Can azoospermia resolve on its own?

In a word, no.

“Most men with azoospermia…will consistently have very, very low sperm counts or no sperm,” says Dr. Schlegel.

“But sometimes they go from zero sperm to enough sperm in the ejaculate that you can actually use them for IVF… It is unusual for azoospermia to revert to completely normal sperm production.»

This is why it may be helpful to repeat the tests.

Azoospermia Surgery Options

When sperm are not found in the ejaculate, surgical sperm retrieval is often the next step. Here are the three main surgical options for azoospermia used today:

• PESA or MESA (epididymal aspiration) – Typically used in cases of obstructive azoospermiawhere sperm production is normal but cannot reach the ejaculate. PESA is done with a needle. MESA involves minor surgery and is somewhat more successful.

• TESE (testicular biopsy) – This involves taking small biopsies directly from the testicle to look for sperm. This approach can be used for obstructive and non-obstructive azoospermia.

• Micro-TESE (microscopic testicular extraction) – The most advanced and most common surgical option used for non-obstructive azoospermiawhere sperm production is extremely limited

What is the difference between TESE and micro-TESE?

“The difference between TESE and micro-TESE is simply a series of small biopsies, samples taken from the testicle that are done randomly.

Micro-TESE is a search with an operating microscope that allows you to identify the smallest and best areas of the testicle, so that very little tissue is removed and you have the best chance of finding the areas of sperm production. said Dr. Schlegel.

This precision is why micro-TESE is often used for non-obstructive azoospermia.

Are there new treatments for azoospermia in 2026?

“There are several areas where research is being conducted to improve the treatment of men with azoospermia.” said Dr. Schlegel.

1. Both AI-based And extended sperm searches – aimed at improving the detection of very rare sperm in ejaculate
2. Medicines like isotretinoin – an investigational vitamin A agent that may help improve sperm production in some men

Advances are steady, practical, and focused on finding sperm where they were previously missed.