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Johnsen Score
| Score | Level of spermatogenesis |
|---|---|
| 10 | Full spermatogenesis |
| 9 | Slightly impaired spermatogenesis |
| 8 | Less than five spermatozoa per tubule |
| 7 | No late spermatids; many early spermatids |
| 6 | Few early spermatids; many of spermatogenesis at the spermatid stage |
| 5 | Many spermatocytes |
| 4 | Few spermatocytes, arrest of spermatogenesis at the primary spermatocyte stage |
| 3 | Spermatogonia only |
| 2 | No germ cells, Sertoli cells only |
| 1 | No seminiferous epithelial cell, tubular sclerosis |
