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Further information: Testicular infertility factors
(A)spermia - complete lack of semen
(Asthenozoo)spermia - reduced sperm motility
(Azoo)spermia - absence of sperm cells in semen
(Hyper)spermia - large semen volume
(Hypo)spermia - small semen volume
(Oligozoo)spermia - few spermatozoa in semen
(Necrozoo)spermia - dead or immobile sperms
(Teratozoo)spermia - sperm with abnormal morphology

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 (see Primary ciliary dyskinesia) 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]


  1. ^ a b c d Ortega, C.; Verheyen, G.; Raick, D.; Camus, M.; Devroey, P.; Tournaye, H. (2011). "Absolute asthenozoospermia and ICSI: What are the options?". Human Reproduction Update. 17 (5): 684–692. PMID 21816768. doi:10.1093/humupd/dmr018. 

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