Portal cirrhosis on electrophoretic serum protein pattern shows which predominant feature?

• A. Monoclonal band in the gamma region
• B. Polyclonal band in the gamma region
• C. Bridging effect between the beta- and gamma-globulin bands
• D. Increase in the alpha2-globulin band

Answer: (C)

The main idea is that chronic liver disease, such as portal cirrhosis, often causes polyclonal gammopathy with a distinctive beta–gamma bridging on serum protein electrophoresis. In cirrhosis, immune activation leads to increased immunoglobulins, especially IgA, which migrates in the beta region. As these immunoglobulins rise, the beta and gamma bands merge, producing a continuous connection or “bridge” between them. This beta–gamma bridging is characteristic of cirrhosis and helps distinguish it from other patterns.

A monoclonal band in the gamma region would suggest a plasma cell disorder like myeloma, not cirrhosis. A simple polyclonal gamma increase lacks the specific beta–gamma connection. An isolated increase in the alpha2 region points to other conditions (like inflammation or nephrotic-related changes) and is not the hallmark here.