Blood Plasma

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Plasma is the liquid portion of blood – a protein-salt solution in which red and white blood cells and platelets are suspended. Plasma, which is 92 percent water, constitutes 55 percent of blood volume.

Plasma contains albumin (the chief protein constituent), fibrinogen (responsible, in part, for the clotting of blood) and globulins (including antibodies).

Plasma serves a variety of functions, from maintaining a satisfactory blood pressure and volume to supplying critical proteins for blood clotting and immunity. PlasmaIt also serves as the medium for exchange of vital minerals such as sodium and potassium and helps to maintain a proper pH (acid-base) balance in the body, which is critical to cell function. Plasma is obtained by separating the liquid portion of blood from the cells.[1]

© Copyright The American National Red Cross. All rights reserved.


Victims suffering from EVD have been treated with convalescent plasma from blood donated by victims who have survived the disease.[2]


  1. "Plasma". Author American Red Cross. Pub date?. Web 28 Oct 2014 http://www.redcrossblood.org/learn-about-blood/blood-components/plasma
  2. "Experimental therapies: growing interest in the use of whole blood or plasma from recovered Ebola patients (convalescent therapies)". Author WHO. Pub date Sep 26 2014. Web 28 Oct 2014 http://www.who.int/mediacentre/news/ebola/26-september-2014/en/