Blood is made up of cellular and liquid portions. The liquid portion is plasma and may be up to 55% of the blood. The plasma is 92% water but also contains the vital proteins and antibodies to help fight infections. People with certain types of medical disorders, such as allergies, may also have unusual antibodies in their plasma associated to their condition. It is these types of antibodies that are crucial to diagnostic and research facilities.
Plasma can be donated as often as twice in a seven day period, with at least 48-hours between donations. Plasma is quickly and easily restored by your body within 24 hours.