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Jul 9, - When it comes to sperm motility, for an ejaculate sample to be considered normal, at least 40 percent of the sperm should be motile, or moving. This can include non-progressive movement. At least 32 percent of the sperm should show progressive motility.‎Understanding Semen · ‎Article Causes of Low Sperm. May 22, - If less than 40 percent of your sperm are motile, your considered to have low sperm motility. In addition to sperm motility, your doctor can also use a semen analysis to test: the health of the male genital tract.‎Sperm motility · ‎Causes · ‎Diagnosis.