Serum protein electrophoresis (SPEP) is a laboratory test that examines specific proteins in the blood called globulins. Blood must first be collected, usually into an airtight vial or syringe. Electrophoresis is a laboratory technique in which the blood serum (the fluid portion of the blood after the blood has clotted) is placed on special paper treated with agarose gel and exposed to an electric current to separate the serum protein components into five major fractions by size and electrical charge: serum albumin, alpha-1 globulins, alpha-2 globulins, beta globulins, and gamma globulins.
Read more about Serum Protein Electrophoresis: Prealbumin, Albumin, Albumin - Alpha-1 Interzone, Alpha-1 Zone, Alpha-1 - Alpha-2 Interzone, Alpha-2 Zone, Alpha-2 - Beta Interzone, Beta Zone, Beta-Gamma Interzone, Gamma Zone
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—Alfred Gingold, U.S. humorist. Items From Our Catalogue, “Tofu Innersoles,” Avon Books (1982)