Whole blood donation is the most common form of donation and involves giving just under one pint (470ml) of blood.
Donors can give every 16 weeks, which is three times a year and blood can be used to treat conditions such as blood loss from surgery, trauma, childbirth, blood disorders and cancer.
A donation takes around an hour and donors are encouraged to drink a pint of water prior to donating.
Before every session donors are required to complete a Donor Health Check (DHC) to check they are eligible. They can discuss the results with a nurse and their iron levels are measured to ensure they are not anemic. Find out more about the process here.