Plasma can be frozen for up to two years and blood products made from plasma can be stored for up to two years.
Plasma, which is 90% water, constitutes about 55% of blood volume. Plasma contains:
Plasma serves a variety of functions, from maintaining a satisfactory blood pressure and volume to supplying critical proteins for blood clotting and immunity. It also serves as the medium of exchange for vital minerals such as sodium and potassium.