What is semen concentration?

Sperm concentration may vary from laboratory to laboratory, but is usually about 20 million sperm per milliliter. Sperm

concentration may vary depending on a variety of factors, such as age, health status, lifestyle, etc. Sperm concentration may also be affected by factors such as prostaglandin content in urine, environmental conditions at ejaculation, etc.

Note that sperm concentration is not the only indicator of male fertility, but also needs to be considered in conjunction with sperm morphology and number.