If ejaculation by masturbation is difficult, semen may be collected by interrupted intercourse. Semen should be slightly alkaline. Average volume and content of human ejaculate. Oakland University Rochester, Michigan Motile moving sperm have been found in the human fallopian tube up to 85 hours after coitus, although the ability to fertilize an egg is usually lost before motility is lost. In the same way, men who have a very low sperm concentration and are not within these reference ranges might still be able to get a partner pregnant naturally.
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The answer depends on a number of things, but the most important is where the sperm are located. Semen should be slightly alkaline. She is also co-editor of the collection The Body Reader and, with Monica Casper, oversees the series Biopolitics: Semen testing should be done on a fresh semen sample within one hour of being produced. Test Your Fertility IQ Boost Your Fertility Infertility Treatments Should You See a Doctor? Washed or unwashed sperm?