Sperm should be collected after 3 to 5 days of abstinence. Longer than 7 days can result in lower motility. The semen should be evaluated within 45 minutes of collection; otherwise the result could be false and misleading.
Recent evidence shows that a signifiant percentage of men with severely depressed sperm counts (severe oligospermia) have abnormalities in their chromosomes such as Klinefelter’s syndrome where an extra X chromosome exists instead of only one (XXY instead of XY).
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