There are two different procedures for testicular biopsy.
A testicular biopsy can be done for the men who have:
Sometimes the testicular biopsy is done to identify the tumor.
Semen examination can identify the issues like low sperm count with abnormality, low sperm motility or Azoospermia (No sperm found), etc. Often, blood tests and hormone tests confirm the causes of those issues but in case, these tests are not enough to confirm, one needs to go for a testicular biopsy.