How big is the normal size of a testicle?

Patient's question:

I would like to ask about some questions regarding the testicles. I currently feel that my testicles are a bit small, and I don't think adults would ever be that small. I'm a bit worried about future fertility issues. I would like to ask, what is the normal size for testicles? If they are too small, what should I do?

Doctor's answer:

The normal size of a testicle is 3.3 x 2.27 x 1.71 cm. The right testicle is slightly larger than the left. If, as you mentioned, your testicles are smaller than the normal size, this situation could be caused by congenital testicular underdevelopment. If there is congenital testicular underdevelopment, it may have some impact on future fertility. If the testicles are indeed small, it is recommended to seek medical attention for a definitive diagnosis and treatment.

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