noun
sperm concentration
Medical term used in semen analysis and fertility contexts.
精子濃度が低いと、妊娠しにくくなることがあります。
Low sperm concentration can make it harder to conceive.
精子数 refers to total sperm count, while 精子濃度 specifically means concentration (per unit volume).
Compound of 精子 (sperm) and 濃度 (concentration).