Proteins are made from amino acids and are important parts of all cells and tissues. There are many different kinds of proteins in the body with many different functions. Examples of proteins include enzymes, certain hormones, hemoglobin, low-density lipoprotein ("bad" cholesterol), and others.
Serum proteins are classified as albumin or globulins. Albumin is the protein of highest concentration in the serum. It carries many small molecules. It is also important for keeping fluid from leaking out from the blood vessels into the tissues.
Globulins are divided into alpha-1, alpha-2, beta, and gamma globulins. In general, alpha and gamma globulin protein levels increase when there is inflammation in the body.
Lipoprotein electrophoresis determines the amount of proteins made up of protein and fat, called lipoproteins (such as LDL cholesterol).