Can someone with one healthy testicle father a child?
One healthy testicle may produce enough sperm and hormones for fertility, so fathering a child is possible. It is not guaranteed: remaining testicular health, the reason for losing the other testicle and previous treatment matter. Semen analysis can help when assessment is needed.
Details
Sexual function is not a fertility test
Erections and ejaculation may remain normal after removal of a testicle, but do not establish sperm count or quality. Discuss your history and suitable testing if planning a family or concerned.
Before potentially fertility-affecting treatment
If surgery or cancer treatment is planned, ask early about fertility assessment and sperm storage. The team coordinates this with the urgency of treating the illness; do not independently delay necessary care.
Follow-up depends on the cause
A testicle absent since childhood is different from one removed after injury or a tumour. Continue follow-up for the original condition and report a new lump or change in the remaining testicle. Seek support if confidence or relationships are affected.
Related reading: How should I prepare for semen analysis, and what does the result mean?.