Fertility with one testicle

Many men with a single testis have normal semen analyses and conceive naturally. Where the remaining testis was also affected — by undescended testis, torsion or cancer treatment — sperm production may be reduced, so testing is worthwhile.

Also known as: one testis, monorchism

Last reviewed: September 9, 2026. Written by the Antega Editorial Team. General information only — always follow the advice of your own clinic, doctor or pharmacist.