Sperm donation is a disinterested, anonymous and voluntary act. That is why sperm banks do not usually require a minimum number of donated samples. Thus, a sperm donor may have donated a single sample, or several. What is necessary is the donor's availability to perform a blood collection for
blood collection about three months after the donation.
This is because the main infectious diseases (HIV, Hepatitis) have a period in which they cannot be detected in the common analysis of approximately 3 months (sales period) so the law requires a strict selection of the donor, including the performance of tests for infectious diseases, that all semen samples are frozen (without exception) and then checked three months later by a new blood collection for the absence of these pathologies. According to the law, only in this way can the donated semen be used, so all banks will require this availability from the donor.