It depends on the particular donation. Some men may produce 1 or 2 vials with one donation; others might produce 3 or 4, or even more.
There are a number of factors that influence this, the most significant being how long the sperm donor remains abstinent before donating. Abstinence can make a big difference in the quantity of semen produced in one donation.
This is why sperm banks usually ask their donors to abstain for a few days, at minimum, before they donate.
Find out everything you want to know about fertility and donor insemination (also called artificial insemination). Check out our glossary or information like choosing a Reproductive Endocrinologist, choosing donor sperm, choosing a sperm bank and much more!
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