When giving blood, approximately 470mL of blood will be donated (7% - 8% of the blood volume of an average adult, i.e. approx. 1.5 cans of soft drink), plus 15mL for test samples.
White Blood Cells are vital to prevent and fight infection.
White cells are made in the bone marrow and their life span varies from a few hours to many weeks.
White cells are essential to protect us from infection, but they are not often transfused because they are difficult to collect and their life span is so short.