Back to glossary

Fertility Glossary

Sperm concentration

The number of sperm per millilitre of semen.

Male fertility

Sperm concentration is reported in million per millilitre and compared against WHO reference values, which describe what is seen in men whose partners conceived within a year — not a pass or fail line. Concentration varies considerably between samples, so a single below-range result is usually repeated after about three months.

Also known as: sperm count, sperm density

Sources

  • WHO laboratory manual for the examination and processing of human semen (who.int)
  • Healthy Male (healthymale.org.au)

Last reviewed: 10 September 2026. Written by the Antega Editorial Team. General information only — always follow the advice of your own clinic, doctor or pharmacist.

Explore in-depth guides

Learn more with Antega's fertility guides and articles.