| -spermia, Further information: Testicular infertility factors |
| (Oligo)spermia - few spermatozoa in semen |
| (Hypo)spermia - small semen volume |
| (A)spermia - complete lack of semen |
| (Azoo)spermia - absence of sperm cells in semen |
| (Terato)spermia - sperm with abnormal morphology |
| (Asthenozoo)spermia - reduced sperm motility |
Asthenozoospermia (or "asthenospermia") is the medical term for reduced sperm motility. Complete asthenozoospermia, that is, 100% immotile spermatozoa in the ejaculate, is reported at a frequency of 1 of 5000 men.[1] Causes of complete asthenozoospermia include metabolic deficiencies, ultrastructural abnormalities of the sperm flagellum and necrozoospermia.[1]
It decreases the sperm quality and is therefore one of the major causes of infertility or reduced fertility in men. A method to increase the chance of pregnancy is ICSI.[1] The percentage of viable spermatozoa in complete asthenozoospermia varies between 0 and 100%.[1]
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