Azoospermia is the medical condition of a male not having any measurable level of sperm in his semen. It is associated with very low levels of fertility.

Azoospermia has two forms:
Obstructive Azoospermia, where sperm are created, but cannot be mixed with the rest of the ejaculatory fluid due to a physical obstruction, and;
Non-obstructive Azoospermia, where there is a problem with spermatogenesis, as in the condition of hyperprolactinemia.

The diagnosis of Azoospermia is sometimes still made even though as many as 500,000 sperm per ml of semen may have been seen in a sperm sample because it is extremely unlikely that the man will be able to father a child naturally with this number of sperm.

This means that if you are diagnosed with Azoospermia that you must ask your doctor whether you have either (i) a very low sperm count so that you know you do at least make some sperm or (ii) absolutely no sperm at all which is the worst case scenario for any man to face.

So, if the doctor says you have Azoospermia make sure you ask for a copy of the semen analysis results so that you can understand the situation.

Azoospermia occurs in about 2% of men in the general population.       So whilst not common, there are plenty of infertile men around and in the UK alone we would expect to find at least 300,000 men with Azoospermia and many of these would appear extremely healthy and have no indication that any problem might exist !
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Azoospermia