Which electrophoresis pattern corresponds to chronic infection with a delayed response?

• A. Polyclonal gammopathy (small elevation in gamma) with decreased albumin and increased a1, a2, gamma
• B. Polyclonal gammopathy (large elevation in gamma) with beta-gamma bridging
• C. Nephrotic syndrome pattern with decreased albumin
• D. Acute inflammation pattern with decreased albumin and increased a1, a2

Answer: (A)

The pattern being tested reflects how the immune system responds over time in the serum protein profile. In chronic infection, the immune system remains stimulated for a long period, causing many different B-cell clones to produce antibodies. This yields a polyclonal rise in immunoglobulins, seen as a broad, modest increase in the gamma region rather than a sharp spike. At the same time, the liver responds to ongoing inflammation by increasing acute-phase proteins, which shows up as mild increases in the alpha bands, and albumin, a negative acute-phase reactant, tends to fall.

So a small elevation in gamma together with decreased albumin and increased alpha-1 and alpha-2 fits chronic infection with a delayed antibody response. The other patterns point to different situations: a very large gamma rise with beta-gamma bridging suggests a different form of hypergammaglobulinemia or monoclonal processes; a nephrotic pattern centers on hypoalbuminemia without the characteristic gamma change; an acute inflammation pattern emphasizes alpha band elevation rather than gamma.