Each cryobank follows its own protocols to insure that specimens are not mixed up. Some banks have a policy that only one specimen at a time can be processed to ensure that there can be no confusion. Each vial generally has both the patient’s name and an accession number which is unique to him. You should make sure that whichever cryobank you choose follows rigorous standards for the labeling and tracking of specimens.
If you seeking a sperm donation, or are a prospective donor, here is a list of sperm banks by location.