Oligospermia is a male fertility issue characterized by a low sperm count. Other aspects of the sexual health of men with this condition are typical. This includes the ability to get and maintain an erection, as well as produce ejaculation at orgasm.

Sperm count in your ejaculate can vary throughout your life. A healthy sperm amount is often necessary for fertility. The World Health Organization (WHO) classifies sperm counts at or above 15 million sperm per milliliter (mL) of semen as average. Anything below that is considered low and is diagnosed as oligospermia.

Mild oligospermia is 10 to 15 million sperm/mL.
Moderate oligospermia is considered 5 to 10 million sperm/mL.
Severe oligospermia is diagnosed when sperm counts fall between 0 and 5 million sperm/mL.
It’s unclear how many men have low sperm amounts in their semen. This is, in part, because not everyone with the condition is diagnosed. Only men who have difficulty with conceiving naturally and ultimately seek help may be diagnosed.