Wanting the child checked twice with no sperm, is it necessary to do a testicle

Patient's question:

Patient is male, 26 years old, smokes frequently, and has been tested twice without sperm

Doctor's answer:

General procedures for diagnosing male infertility: First, it should be determined whether the infertility is male-related, female-related, or both; if it is male infertility, it should be clarified whether it is absolute or relative infertility, primary or secondary infertility; finally, the cause of male infertility should be identified.
The examination and diagnostic methods for male infertility generally include detailed medical history, physical examination, laboratory tests, imaging tests, and other examinations.