TABLE 1. Nomenclature for semen variables.
| Classification | Definition |
| Normospermia | Normal ejaculate as defined in Table 2 |
| Oligozoospermia | Sperm concentration <20 x 106/ml |
| Asthenozoospermia | Fewer than 50% spermatozoa with forward progression or fewer than 25% spermatozoa with rapid linear progression |
| Teratozoospermia | Fewer than 30% spermatozoa with normal morphology |
| Oligoasthenoteratozoospermia | Signifies disturbance of all three variables (combination of only two prefixes may also be used) |
| Azoospermia | No spermatozoa in the ejaculate |
| Aspermia | No ejaculate |