Sperm Concentration

Sperm concentration is a measurement that indicates how many sperm cells are present in a unit volume of semen. It is usually expressed as the number of sperm per milliliter (mL).

According to the 2010 World Health Organization (WHO) reference values, a sperm concentration of more than 15 million sperm per mL is considered normal. Having a low sperm concentration is a well-known cause of male factor infertility.

A semen analysis is routinely performed to evaluate sperm concentration as part of a male fertility investigation.

Sperm concentration is also called sperm density.