Serum serum protein electrophoresis...

Serum serum protein electrophoresis is a laboratory examination that commonly is used to identify patients with multiple myeloma and other disorders of protein. Many subspecialists include serum protein electrophoresis screening in the initial evaluation for numerous clinical conditions. Sometimes, however, the conclusions of this examination can be confusing or difficult to interpret.

This article provides a comprehensive review of serum protein electrophoresis, including a discussion of for what reason the examination is performed, what it measures, and when it is indicated. The article also provides a simple guide to accrue interpretation and suggestions on follow-up of abnormal results

Definitions

Electrophoresis is a system of separating proteins based forward their physical properties. Serum is placed in succession a specific medium, and a charge is applied. The pure charge (positive or negative) and the size and shape of the protein commonly are used in differentiating various serum proteins. (1)

Several subset of serum protein electrophoresis are available. The names of these subset are based in succession the method that is used to separate and differentiate the various serum ingredients In zone electrophoresis, for example, different protein subtype are placed in separate physical locations forward a gel made from agar, cellulose or other plant material. (23) The proteins are stained, and their densities are calculated electronically to provide graphical data forward the absolute and relative amounts of the various proteins. Further separation of protein subtype is achieved from staining with an immunologically active agent, which be deriveds in immunofluorescence and immunofixation.

composings of Serum Protein Electrophoresis

The pattern of serum protein electrophoresis issues depends on the fractions of brace major types of protein: albumin and globulins. Albumin, the major protein element of serum, is produced according to the liver under normal physiologic conditions. Globulins comprise a greatly smaller fraction of the total serum protein make easy The subsets of these proteins and their relative quantity are the primary focus of the interpretation of serum protein electrophoresis. (13)

Albumin, the largest peak, lies closest to the positive electrode The nearest five components (globulins) are labeled [alpha.sub.1], [alpha.sub.2], [beta.sub.1], [beta.sub.2], and gamma. The peaks for these component parts lie toward the negative electrode with the gamma peak being closest to that electrode Figure 1 point outs a typical normal pattern for the distribution of proteins as determined by dint of serum protein electrophoresis.

[FIGURE 1 OMITTED]

ALBUMIN

The albumin band delineates the largest protein component of human serum The albumin flat is decreased under circumstances in which there is les production of the protein according to the liver or in which there is increased los or degradation of this protein. Malnutrition, significant liver disease, renal los (eg in nephrotic syndrome) hormone therapy, and pregnancy may account for a grave albumin level. Burns also may follow in a low albumin even Levels of albumin are increased in patients with a relative reduction in serum water (eg dehydration).

ALPHA FRACTION

Moving toward the negative portion of the gel (i.e., the negative electrode) the nearest peaks involve the [alpha.sub.1] and [alpha.sub.2] composings The [alpha.sub.1]-protein fraction is comprised of [alpha.sub.1]-antitrypsin, thyroid-binding globulin, and transcortin. Malignancy and acute inflammation (resulting from acute-phase reactants) can increase the [alpha.sub.1]-protein band. A decreased [alpha.sub.1]-protein band may appear because of [alpha.sub.1]-anti-trypsin deficiency or decreased production of the globulin as a conclusion of liver disease. Ceruloplasmin, [alpha.sub.2]-macroglobulin, and haptoglobin contribute to the [alpha.sub.2]-protein band. The [alpha.sub.2] component part is increased as an acute-phase reactant.

BETA FRACTION

The beta fraction has pair peaks labeled [beta.sub.1] and [beta.sub.2]. [Beta.sub.1] is compos mainly of transferrin, and [beta.sub.2] contains beta-lipoprotein. IgA, IgM, and sometimes IgG, along with perfection proteins, also can be identified in the beta fraction.

GAMMA FRACTION

a great deal of of the clinical interest is focused onward the gamma region of the serum protein appearance because immunoglobulins migrate to this region. It should be noted that immunoglobulins frequently can be found throughout the electrophoretic appearance C-reactive protein (CRP) is located in the area between the beta and gamma component parts (1)

Indications

Serum protein electrophoresis commonly is performed when multiple myeloma is suspected. The examination also should be considered in other "r flag" situations (Table 1) (2-4)

If the examination is normal unless multiple myeloma, Waldenstrom's macroglobulinemia, primary amyloidosis, or a related disorder still is suspected, immunofixation also should be performed because this technique may be more sensitive in identifying a small monoclonal (M) protein. (5)