As the list grows, the blood collection interval can be increased. However, too many donors increase yearly health screening costs. With either on-site or external donors, a donor log should be kept in addition to the donor's medical file. The log can contain the name, blood type,schedule dates for yearly or twice yearly screening test, blood collection dates, and the owner's contact information, if it is an external donor. A transfusion log should also be kept with information on each transfusion, including the date of transfusion, donor, type and volume of blood component used, recipient, diagnosis, and problems encountered, such as adverse reaction. In addition, a note that the recipient has received a blood transfusion should be included in a visible location in recipient's medical file.