Term

Definitions

Normozoospermia

Normal ejaculate as defined by the reference values

Oligozoospermia

Sperm concentration fewer than 20 × 106/mL

Asthenozoospermia

Fewer than 50% spermatozoa with forward progression (categories “a” and “b”) or fewer than 25% spermatozoa with category “a” movement

Teratozoospermia

Fewer than 30% spermatozoa with normal morphology Less than the reference value for morphology

Oligoasthenoteratozoospermia

Signifies disturbance of all three variables (combinations of only two prefixes may also be used)

Azoospermia

No spermatozoa in the ejaculate

Aspermia

No ejaculate