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Plasma is the liquid component of blood, in which the blood cells are suspended. It is yellow in color.[1] Plasma makes up about 55% of total blood volume, and is composed of mostly water (90% by volume).[2][3] Plasma carries not only the blood cells but also nutrients (sugars, amino acids, fats, salts, minerals, etc.), waste products (CO2, lactic acid, urea, etc.), antibodies, clotting proteins (called clotting factors), chemical messengers such as hormones, and proteins that help maintain the body's fluid balance.[1]


Below is the composition of blood plasma and the percentages of each component.[4]

The Composition of Plasma
Component Percent
Water ~92
Proteins 6-8
Salt 0.8
Lipids 0.6
Glucose 0.1

See Also[]


  1. 1.0 1.1 RCN (n.d.). Blood. Retrieved on 2008-10-02. Cite error: Invalid <ref> tag; name "PSBC" defined multiple times with different content
  2. Revision Notes (n.d.). Composition of Blood. Revision Retrieved on 2008-10-02.
  3. various (n.d.). Plasma. Wikipedia. Retrieved on 2008-10-02.
  4. RCN (n.d.). Blood. Retrieved on 2008-10-02.