Plasma serves several important functions: Maintains blood pressure and volume. Supplies proteins for blood clotting. Carries electrolytes throughout the body to muscles. Supports cell function by maintaining proper pH balance When you donate plasma, it is a valuable resource to treat a variety of health problems. It is often used in treatments to save those suffering from medical emergencies including burns, shock, and trauma. Because plasma can increase blood volume and helps aid clotting, it is also provided to those with severe liver disease or clotting deficiencies. Plasma is also used by pharmaceutical companies as a component in certain medications.