<unk>  (or asthenospermia) is the medical term for reduced sperm motility. Complete<unk> , that is, 100% immotile spermatozoa in the ejaculate, is reported at a frequency of 1 of 5000 men. Causes of complete<unk>  include metabolic deficiencies, ultrastructural abnormalities of the sperm flagellum (see Primary ciliary dyskinesia) and necrozoospermia. 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. The percentage of viable spermatozoa in complete<unk>  varies between 0 and 100%.
Asthenozoospermia
Globozoospermia
Azoospermia
Hypospermia
Oligospermia
Teratospermia
Hematospermia
Spermatorrhea